The loading time of a VM is quite significant when its virtio devices use a large amount of virt-queues (e.g. a virtio-serial device with max_ports=511). Most of the time is spend in the creation of all the required event notifiers (ioeventfd and memory regions). This patch pack all the changes to the memory regions in a single memory transaction. Reported-by: Sitong Liu Reported-by: Xiaoling Gao Signed-off-by: Gal Hammer <ghammer@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Greg Kurz <groug@kaod.org> Tested-by: Greg Kurz <groug@kaod.org>
2724 lines
75 KiB
C
2724 lines
75 KiB
C
/*
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* Virtio Support
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*
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* Copyright IBM, Corp. 2007
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "qemu-common.h"
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#include "cpu.h"
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#include "trace.h"
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#include "exec/address-spaces.h"
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#include "qemu/error-report.h"
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#include "hw/virtio/virtio.h"
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#include "qemu/atomic.h"
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#include "hw/virtio/virtio-bus.h"
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#include "hw/virtio/virtio-access.h"
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#include "sysemu/dma.h"
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/*
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* The alignment to use between consumer and producer parts of vring.
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* x86 pagesize again. This is the default, used by transports like PCI
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* which don't provide a means for the guest to tell the host the alignment.
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*/
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#define VIRTIO_PCI_VRING_ALIGN 4096
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typedef struct VRingDesc
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{
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uint64_t addr;
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uint32_t len;
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uint16_t flags;
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uint16_t next;
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} VRingDesc;
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typedef struct VRingAvail
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{
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uint16_t flags;
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uint16_t idx;
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uint16_t ring[0];
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} VRingAvail;
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typedef struct VRingUsedElem
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{
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uint32_t id;
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uint32_t len;
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} VRingUsedElem;
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typedef struct VRingUsed
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{
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uint16_t flags;
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uint16_t idx;
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VRingUsedElem ring[0];
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} VRingUsed;
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typedef struct VRingMemoryRegionCaches {
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struct rcu_head rcu;
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MemoryRegionCache desc;
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MemoryRegionCache avail;
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MemoryRegionCache used;
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} VRingMemoryRegionCaches;
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typedef struct VRing
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{
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unsigned int num;
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unsigned int num_default;
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unsigned int align;
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hwaddr desc;
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hwaddr avail;
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hwaddr used;
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VRingMemoryRegionCaches *caches;
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} VRing;
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struct VirtQueue
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{
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VRing vring;
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/* Next head to pop */
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uint16_t last_avail_idx;
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/* Last avail_idx read from VQ. */
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uint16_t shadow_avail_idx;
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uint16_t used_idx;
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/* Last used index value we have signalled on */
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uint16_t signalled_used;
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/* Last used index value we have signalled on */
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bool signalled_used_valid;
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/* Notification enabled? */
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bool notification;
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uint16_t queue_index;
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unsigned int inuse;
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uint16_t vector;
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VirtIOHandleOutput handle_output;
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VirtIOHandleAIOOutput handle_aio_output;
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VirtIODevice *vdev;
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EventNotifier guest_notifier;
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EventNotifier host_notifier;
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QLIST_ENTRY(VirtQueue) node;
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};
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static void virtio_free_region_cache(VRingMemoryRegionCaches *caches)
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{
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if (!caches) {
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return;
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}
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address_space_cache_destroy(&caches->desc);
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address_space_cache_destroy(&caches->avail);
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address_space_cache_destroy(&caches->used);
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g_free(caches);
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}
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static void virtio_init_region_cache(VirtIODevice *vdev, int n)
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{
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VirtQueue *vq = &vdev->vq[n];
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VRingMemoryRegionCaches *old = vq->vring.caches;
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VRingMemoryRegionCaches *new;
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hwaddr addr, size;
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int event_size;
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int64_t len;
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event_size = virtio_vdev_has_feature(vq->vdev, VIRTIO_RING_F_EVENT_IDX) ? 2 : 0;
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addr = vq->vring.desc;
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if (!addr) {
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return;
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}
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new = g_new0(VRingMemoryRegionCaches, 1);
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size = virtio_queue_get_desc_size(vdev, n);
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len = address_space_cache_init(&new->desc, vdev->dma_as,
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addr, size, false);
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if (len < size) {
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virtio_error(vdev, "Cannot map desc");
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goto err_desc;
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}
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size = virtio_queue_get_used_size(vdev, n) + event_size;
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len = address_space_cache_init(&new->used, vdev->dma_as,
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vq->vring.used, size, true);
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if (len < size) {
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virtio_error(vdev, "Cannot map used");
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goto err_used;
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}
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size = virtio_queue_get_avail_size(vdev, n) + event_size;
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len = address_space_cache_init(&new->avail, vdev->dma_as,
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vq->vring.avail, size, false);
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if (len < size) {
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virtio_error(vdev, "Cannot map avail");
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goto err_avail;
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}
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atomic_rcu_set(&vq->vring.caches, new);
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if (old) {
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call_rcu(old, virtio_free_region_cache, rcu);
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}
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return;
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err_avail:
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address_space_cache_destroy(&new->used);
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err_used:
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address_space_cache_destroy(&new->desc);
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err_desc:
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g_free(new);
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}
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/* virt queue functions */
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void virtio_queue_update_rings(VirtIODevice *vdev, int n)
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{
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VRing *vring = &vdev->vq[n].vring;
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if (!vring->num || !vring->desc || !vring->align) {
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/* not yet setup -> nothing to do */
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return;
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}
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vring->avail = vring->desc + vring->num * sizeof(VRingDesc);
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vring->used = vring_align(vring->avail +
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offsetof(VRingAvail, ring[vring->num]),
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vring->align);
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virtio_init_region_cache(vdev, n);
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}
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/* Called within rcu_read_lock(). */
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static void vring_desc_read(VirtIODevice *vdev, VRingDesc *desc,
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MemoryRegionCache *cache, int i)
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{
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address_space_read_cached(cache, i * sizeof(VRingDesc),
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desc, sizeof(VRingDesc));
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virtio_tswap64s(vdev, &desc->addr);
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virtio_tswap32s(vdev, &desc->len);
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virtio_tswap16s(vdev, &desc->flags);
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virtio_tswap16s(vdev, &desc->next);
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}
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static VRingMemoryRegionCaches *vring_get_region_caches(struct VirtQueue *vq)
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{
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VRingMemoryRegionCaches *caches = atomic_rcu_read(&vq->vring.caches);
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assert(caches != NULL);
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return caches;
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}
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/* Called within rcu_read_lock(). */
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static inline uint16_t vring_avail_flags(VirtQueue *vq)
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{
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VRingMemoryRegionCaches *caches = vring_get_region_caches(vq);
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hwaddr pa = offsetof(VRingAvail, flags);
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return virtio_lduw_phys_cached(vq->vdev, &caches->avail, pa);
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}
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/* Called within rcu_read_lock(). */
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static inline uint16_t vring_avail_idx(VirtQueue *vq)
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{
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VRingMemoryRegionCaches *caches = vring_get_region_caches(vq);
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hwaddr pa = offsetof(VRingAvail, idx);
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vq->shadow_avail_idx = virtio_lduw_phys_cached(vq->vdev, &caches->avail, pa);
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return vq->shadow_avail_idx;
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}
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/* Called within rcu_read_lock(). */
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static inline uint16_t vring_avail_ring(VirtQueue *vq, int i)
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{
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VRingMemoryRegionCaches *caches = vring_get_region_caches(vq);
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hwaddr pa = offsetof(VRingAvail, ring[i]);
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return virtio_lduw_phys_cached(vq->vdev, &caches->avail, pa);
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}
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/* Called within rcu_read_lock(). */
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static inline uint16_t vring_get_used_event(VirtQueue *vq)
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{
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return vring_avail_ring(vq, vq->vring.num);
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}
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/* Called within rcu_read_lock(). */
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static inline void vring_used_write(VirtQueue *vq, VRingUsedElem *uelem,
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int i)
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{
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VRingMemoryRegionCaches *caches = vring_get_region_caches(vq);
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hwaddr pa = offsetof(VRingUsed, ring[i]);
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virtio_tswap32s(vq->vdev, &uelem->id);
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virtio_tswap32s(vq->vdev, &uelem->len);
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address_space_write_cached(&caches->used, pa, uelem, sizeof(VRingUsedElem));
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address_space_cache_invalidate(&caches->used, pa, sizeof(VRingUsedElem));
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}
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/* Called within rcu_read_lock(). */
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static uint16_t vring_used_idx(VirtQueue *vq)
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{
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VRingMemoryRegionCaches *caches = vring_get_region_caches(vq);
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hwaddr pa = offsetof(VRingUsed, idx);
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return virtio_lduw_phys_cached(vq->vdev, &caches->used, pa);
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}
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/* Called within rcu_read_lock(). */
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static inline void vring_used_idx_set(VirtQueue *vq, uint16_t val)
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{
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VRingMemoryRegionCaches *caches = vring_get_region_caches(vq);
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hwaddr pa = offsetof(VRingUsed, idx);
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virtio_stw_phys_cached(vq->vdev, &caches->used, pa, val);
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address_space_cache_invalidate(&caches->used, pa, sizeof(val));
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vq->used_idx = val;
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}
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/* Called within rcu_read_lock(). */
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static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask)
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{
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VRingMemoryRegionCaches *caches = vring_get_region_caches(vq);
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VirtIODevice *vdev = vq->vdev;
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hwaddr pa = offsetof(VRingUsed, flags);
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uint16_t flags = virtio_lduw_phys_cached(vq->vdev, &caches->used, pa);
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virtio_stw_phys_cached(vdev, &caches->used, pa, flags | mask);
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address_space_cache_invalidate(&caches->used, pa, sizeof(flags));
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}
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/* Called within rcu_read_lock(). */
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static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask)
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{
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VRingMemoryRegionCaches *caches = vring_get_region_caches(vq);
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VirtIODevice *vdev = vq->vdev;
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hwaddr pa = offsetof(VRingUsed, flags);
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uint16_t flags = virtio_lduw_phys_cached(vq->vdev, &caches->used, pa);
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virtio_stw_phys_cached(vdev, &caches->used, pa, flags & ~mask);
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address_space_cache_invalidate(&caches->used, pa, sizeof(flags));
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}
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/* Called within rcu_read_lock(). */
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static inline void vring_set_avail_event(VirtQueue *vq, uint16_t val)
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{
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VRingMemoryRegionCaches *caches;
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hwaddr pa;
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if (!vq->notification) {
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return;
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}
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caches = vring_get_region_caches(vq);
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pa = offsetof(VRingUsed, ring[vq->vring.num]);
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virtio_stw_phys_cached(vq->vdev, &caches->used, pa, val);
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address_space_cache_invalidate(&caches->used, pa, sizeof(val));
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}
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void virtio_queue_set_notification(VirtQueue *vq, int enable)
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{
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vq->notification = enable;
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if (!vq->vring.desc) {
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return;
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}
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rcu_read_lock();
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if (virtio_vdev_has_feature(vq->vdev, VIRTIO_RING_F_EVENT_IDX)) {
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vring_set_avail_event(vq, vring_avail_idx(vq));
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} else if (enable) {
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vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY);
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} else {
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vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY);
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}
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if (enable) {
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/* Expose avail event/used flags before caller checks the avail idx. */
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smp_mb();
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}
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rcu_read_unlock();
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}
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int virtio_queue_ready(VirtQueue *vq)
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{
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return vq->vring.avail != 0;
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}
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/* Fetch avail_idx from VQ memory only when we really need to know if
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* guest has added some buffers.
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* Called within rcu_read_lock(). */
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static int virtio_queue_empty_rcu(VirtQueue *vq)
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{
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if (unlikely(!vq->vring.avail)) {
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return 1;
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}
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if (vq->shadow_avail_idx != vq->last_avail_idx) {
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return 0;
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}
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return vring_avail_idx(vq) == vq->last_avail_idx;
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}
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int virtio_queue_empty(VirtQueue *vq)
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{
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bool empty;
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if (unlikely(!vq->vring.avail)) {
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return 1;
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}
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if (vq->shadow_avail_idx != vq->last_avail_idx) {
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return 0;
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}
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rcu_read_lock();
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empty = vring_avail_idx(vq) == vq->last_avail_idx;
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rcu_read_unlock();
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return empty;
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}
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static void virtqueue_unmap_sg(VirtQueue *vq, const VirtQueueElement *elem,
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unsigned int len)
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{
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AddressSpace *dma_as = vq->vdev->dma_as;
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unsigned int offset;
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int i;
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offset = 0;
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for (i = 0; i < elem->in_num; i++) {
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size_t size = MIN(len - offset, elem->in_sg[i].iov_len);
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dma_memory_unmap(dma_as, elem->in_sg[i].iov_base,
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elem->in_sg[i].iov_len,
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DMA_DIRECTION_FROM_DEVICE, size);
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offset += size;
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}
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for (i = 0; i < elem->out_num; i++)
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dma_memory_unmap(dma_as, elem->out_sg[i].iov_base,
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elem->out_sg[i].iov_len,
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DMA_DIRECTION_TO_DEVICE,
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elem->out_sg[i].iov_len);
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}
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/* virtqueue_detach_element:
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* @vq: The #VirtQueue
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* @elem: The #VirtQueueElement
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* @len: number of bytes written
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*
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* Detach the element from the virtqueue. This function is suitable for device
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* reset or other situations where a #VirtQueueElement is simply freed and will
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* not be pushed or discarded.
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*/
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void virtqueue_detach_element(VirtQueue *vq, const VirtQueueElement *elem,
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unsigned int len)
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{
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vq->inuse--;
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virtqueue_unmap_sg(vq, elem, len);
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}
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/* virtqueue_unpop:
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* @vq: The #VirtQueue
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* @elem: The #VirtQueueElement
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* @len: number of bytes written
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*
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* Pretend the most recent element wasn't popped from the virtqueue. The next
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* call to virtqueue_pop() will refetch the element.
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*/
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void virtqueue_unpop(VirtQueue *vq, const VirtQueueElement *elem,
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unsigned int len)
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{
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vq->last_avail_idx--;
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virtqueue_detach_element(vq, elem, len);
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}
|
|
|
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/* virtqueue_rewind:
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* @vq: The #VirtQueue
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* @num: Number of elements to push back
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*
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* Pretend that elements weren't popped from the virtqueue. The next
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* virtqueue_pop() will refetch the oldest element.
|
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*
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* Use virtqueue_unpop() instead if you have a VirtQueueElement.
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*
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* Returns: true on success, false if @num is greater than the number of in use
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* elements.
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*/
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bool virtqueue_rewind(VirtQueue *vq, unsigned int num)
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{
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if (num > vq->inuse) {
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return false;
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}
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vq->last_avail_idx -= num;
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vq->inuse -= num;
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return true;
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}
|
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|
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/* Called within rcu_read_lock(). */
|
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void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
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unsigned int len, unsigned int idx)
|
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{
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VRingUsedElem uelem;
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trace_virtqueue_fill(vq, elem, len, idx);
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virtqueue_unmap_sg(vq, elem, len);
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if (unlikely(vq->vdev->broken)) {
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return;
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}
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if (unlikely(!vq->vring.used)) {
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return;
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}
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idx = (idx + vq->used_idx) % vq->vring.num;
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uelem.id = elem->index;
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uelem.len = len;
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vring_used_write(vq, &uelem, idx);
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}
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|
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/* Called within rcu_read_lock(). */
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void virtqueue_flush(VirtQueue *vq, unsigned int count)
|
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{
|
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uint16_t old, new;
|
|
|
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if (unlikely(vq->vdev->broken)) {
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vq->inuse -= count;
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return;
|
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}
|
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|
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if (unlikely(!vq->vring.used)) {
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return;
|
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}
|
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|
|
/* Make sure buffer is written before we update index. */
|
|
smp_wmb();
|
|
trace_virtqueue_flush(vq, count);
|
|
old = vq->used_idx;
|
|
new = old + count;
|
|
vring_used_idx_set(vq, new);
|
|
vq->inuse -= count;
|
|
if (unlikely((int16_t)(new - vq->signalled_used) < (uint16_t)(new - old)))
|
|
vq->signalled_used_valid = false;
|
|
}
|
|
|
|
void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
|
|
unsigned int len)
|
|
{
|
|
rcu_read_lock();
|
|
virtqueue_fill(vq, elem, len, 0);
|
|
virtqueue_flush(vq, 1);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/* Called within rcu_read_lock(). */
|
|
static int virtqueue_num_heads(VirtQueue *vq, unsigned int idx)
|
|
{
|
|
uint16_t num_heads = vring_avail_idx(vq) - idx;
|
|
|
|
/* Check it isn't doing very strange things with descriptor numbers. */
|
|
if (num_heads > vq->vring.num) {
|
|
virtio_error(vq->vdev, "Guest moved used index from %u to %u",
|
|
idx, vq->shadow_avail_idx);
|
|
return -EINVAL;
|
|
}
|
|
/* On success, callers read a descriptor at vq->last_avail_idx.
|
|
* Make sure descriptor read does not bypass avail index read. */
|
|
if (num_heads) {
|
|
smp_rmb();
|
|
}
|
|
|
|
return num_heads;
|
|
}
|
|
|
|
/* Called within rcu_read_lock(). */
|
|
static bool virtqueue_get_head(VirtQueue *vq, unsigned int idx,
|
|
unsigned int *head)
|
|
{
|
|
/* Grab the next descriptor number they're advertising, and increment
|
|
* the index we've seen. */
|
|
*head = vring_avail_ring(vq, idx % vq->vring.num);
|
|
|
|
/* If their number is silly, that's a fatal mistake. */
|
|
if (*head >= vq->vring.num) {
|
|
virtio_error(vq->vdev, "Guest says index %u is available", *head);
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
enum {
|
|
VIRTQUEUE_READ_DESC_ERROR = -1,
|
|
VIRTQUEUE_READ_DESC_DONE = 0, /* end of chain */
|
|
VIRTQUEUE_READ_DESC_MORE = 1, /* more buffers in chain */
|
|
};
|
|
|
|
static int virtqueue_read_next_desc(VirtIODevice *vdev, VRingDesc *desc,
|
|
MemoryRegionCache *desc_cache, unsigned int max,
|
|
unsigned int *next)
|
|
{
|
|
/* If this descriptor says it doesn't chain, we're done. */
|
|
if (!(desc->flags & VRING_DESC_F_NEXT)) {
|
|
return VIRTQUEUE_READ_DESC_DONE;
|
|
}
|
|
|
|
/* Check they're not leading us off end of descriptors. */
|
|
*next = desc->next;
|
|
/* Make sure compiler knows to grab that: we don't want it changing! */
|
|
smp_wmb();
|
|
|
|
if (*next >= max) {
|
|
virtio_error(vdev, "Desc next is %u", *next);
|
|
return VIRTQUEUE_READ_DESC_ERROR;
|
|
}
|
|
|
|
vring_desc_read(vdev, desc, desc_cache, *next);
|
|
return VIRTQUEUE_READ_DESC_MORE;
|
|
}
|
|
|
|
void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes,
|
|
unsigned int *out_bytes,
|
|
unsigned max_in_bytes, unsigned max_out_bytes)
|
|
{
|
|
VirtIODevice *vdev = vq->vdev;
|
|
unsigned int max, idx;
|
|
unsigned int total_bufs, in_total, out_total;
|
|
VRingMemoryRegionCaches *caches;
|
|
MemoryRegionCache indirect_desc_cache = MEMORY_REGION_CACHE_INVALID;
|
|
int64_t len = 0;
|
|
int rc;
|
|
|
|
if (unlikely(!vq->vring.desc)) {
|
|
if (in_bytes) {
|
|
*in_bytes = 0;
|
|
}
|
|
if (out_bytes) {
|
|
*out_bytes = 0;
|
|
}
|
|
return;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
idx = vq->last_avail_idx;
|
|
total_bufs = in_total = out_total = 0;
|
|
|
|
max = vq->vring.num;
|
|
caches = vring_get_region_caches(vq);
|
|
if (caches->desc.len < max * sizeof(VRingDesc)) {
|
|
virtio_error(vdev, "Cannot map descriptor ring");
|
|
goto err;
|
|
}
|
|
|
|
while ((rc = virtqueue_num_heads(vq, idx)) > 0) {
|
|
MemoryRegionCache *desc_cache = &caches->desc;
|
|
unsigned int num_bufs;
|
|
VRingDesc desc;
|
|
unsigned int i;
|
|
|
|
num_bufs = total_bufs;
|
|
|
|
if (!virtqueue_get_head(vq, idx++, &i)) {
|
|
goto err;
|
|
}
|
|
|
|
vring_desc_read(vdev, &desc, desc_cache, i);
|
|
|
|
if (desc.flags & VRING_DESC_F_INDIRECT) {
|
|
if (desc.len % sizeof(VRingDesc)) {
|
|
virtio_error(vdev, "Invalid size for indirect buffer table");
|
|
goto err;
|
|
}
|
|
|
|
/* If we've got too many, that implies a descriptor loop. */
|
|
if (num_bufs >= max) {
|
|
virtio_error(vdev, "Looped descriptor");
|
|
goto err;
|
|
}
|
|
|
|
/* loop over the indirect descriptor table */
|
|
len = address_space_cache_init(&indirect_desc_cache,
|
|
vdev->dma_as,
|
|
desc.addr, desc.len, false);
|
|
desc_cache = &indirect_desc_cache;
|
|
if (len < desc.len) {
|
|
virtio_error(vdev, "Cannot map indirect buffer");
|
|
goto err;
|
|
}
|
|
|
|
max = desc.len / sizeof(VRingDesc);
|
|
num_bufs = i = 0;
|
|
vring_desc_read(vdev, &desc, desc_cache, i);
|
|
}
|
|
|
|
do {
|
|
/* If we've got too many, that implies a descriptor loop. */
|
|
if (++num_bufs > max) {
|
|
virtio_error(vdev, "Looped descriptor");
|
|
goto err;
|
|
}
|
|
|
|
if (desc.flags & VRING_DESC_F_WRITE) {
|
|
in_total += desc.len;
|
|
} else {
|
|
out_total += desc.len;
|
|
}
|
|
if (in_total >= max_in_bytes && out_total >= max_out_bytes) {
|
|
goto done;
|
|
}
|
|
|
|
rc = virtqueue_read_next_desc(vdev, &desc, desc_cache, max, &i);
|
|
} while (rc == VIRTQUEUE_READ_DESC_MORE);
|
|
|
|
if (rc == VIRTQUEUE_READ_DESC_ERROR) {
|
|
goto err;
|
|
}
|
|
|
|
if (desc_cache == &indirect_desc_cache) {
|
|
address_space_cache_destroy(&indirect_desc_cache);
|
|
total_bufs++;
|
|
} else {
|
|
total_bufs = num_bufs;
|
|
}
|
|
}
|
|
|
|
if (rc < 0) {
|
|
goto err;
|
|
}
|
|
|
|
done:
|
|
address_space_cache_destroy(&indirect_desc_cache);
|
|
if (in_bytes) {
|
|
*in_bytes = in_total;
|
|
}
|
|
if (out_bytes) {
|
|
*out_bytes = out_total;
|
|
}
|
|
rcu_read_unlock();
|
|
return;
|
|
|
|
err:
|
|
in_total = out_total = 0;
|
|
goto done;
|
|
}
|
|
|
|
int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes,
|
|
unsigned int out_bytes)
|
|
{
|
|
unsigned int in_total, out_total;
|
|
|
|
virtqueue_get_avail_bytes(vq, &in_total, &out_total, in_bytes, out_bytes);
|
|
return in_bytes <= in_total && out_bytes <= out_total;
|
|
}
|
|
|
|
static bool virtqueue_map_desc(VirtIODevice *vdev, unsigned int *p_num_sg,
|
|
hwaddr *addr, struct iovec *iov,
|
|
unsigned int max_num_sg, bool is_write,
|
|
hwaddr pa, size_t sz)
|
|
{
|
|
bool ok = false;
|
|
unsigned num_sg = *p_num_sg;
|
|
assert(num_sg <= max_num_sg);
|
|
|
|
if (!sz) {
|
|
virtio_error(vdev, "virtio: zero sized buffers are not allowed");
|
|
goto out;
|
|
}
|
|
|
|
while (sz) {
|
|
hwaddr len = sz;
|
|
|
|
if (num_sg == max_num_sg) {
|
|
virtio_error(vdev, "virtio: too many write descriptors in "
|
|
"indirect table");
|
|
goto out;
|
|
}
|
|
|
|
iov[num_sg].iov_base = dma_memory_map(vdev->dma_as, pa, &len,
|
|
is_write ?
|
|
DMA_DIRECTION_FROM_DEVICE :
|
|
DMA_DIRECTION_TO_DEVICE);
|
|
if (!iov[num_sg].iov_base) {
|
|
virtio_error(vdev, "virtio: bogus descriptor or out of resources");
|
|
goto out;
|
|
}
|
|
|
|
iov[num_sg].iov_len = len;
|
|
addr[num_sg] = pa;
|
|
|
|
sz -= len;
|
|
pa += len;
|
|
num_sg++;
|
|
}
|
|
ok = true;
|
|
|
|
out:
|
|
*p_num_sg = num_sg;
|
|
return ok;
|
|
}
|
|
|
|
/* Only used by error code paths before we have a VirtQueueElement (therefore
|
|
* virtqueue_unmap_sg() can't be used). Assumes buffers weren't written to
|
|
* yet.
|
|
*/
|
|
static void virtqueue_undo_map_desc(unsigned int out_num, unsigned int in_num,
|
|
struct iovec *iov)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < out_num + in_num; i++) {
|
|
int is_write = i >= out_num;
|
|
|
|
cpu_physical_memory_unmap(iov->iov_base, iov->iov_len, is_write, 0);
|
|
iov++;
|
|
}
|
|
}
|
|
|
|
static void virtqueue_map_iovec(VirtIODevice *vdev, struct iovec *sg,
|
|
hwaddr *addr, unsigned int *num_sg,
|
|
int is_write)
|
|
{
|
|
unsigned int i;
|
|
hwaddr len;
|
|
|
|
for (i = 0; i < *num_sg; i++) {
|
|
len = sg[i].iov_len;
|
|
sg[i].iov_base = dma_memory_map(vdev->dma_as,
|
|
addr[i], &len, is_write ?
|
|
DMA_DIRECTION_FROM_DEVICE :
|
|
DMA_DIRECTION_TO_DEVICE);
|
|
if (!sg[i].iov_base) {
|
|
error_report("virtio: error trying to map MMIO memory");
|
|
exit(1);
|
|
}
|
|
if (len != sg[i].iov_len) {
|
|
error_report("virtio: unexpected memory split");
|
|
exit(1);
|
|
}
|
|
}
|
|
}
|
|
|
|
void virtqueue_map(VirtIODevice *vdev, VirtQueueElement *elem)
|
|
{
|
|
virtqueue_map_iovec(vdev, elem->in_sg, elem->in_addr, &elem->in_num, 1);
|
|
virtqueue_map_iovec(vdev, elem->out_sg, elem->out_addr, &elem->out_num, 0);
|
|
}
|
|
|
|
static void *virtqueue_alloc_element(size_t sz, unsigned out_num, unsigned in_num)
|
|
{
|
|
VirtQueueElement *elem;
|
|
size_t in_addr_ofs = QEMU_ALIGN_UP(sz, __alignof__(elem->in_addr[0]));
|
|
size_t out_addr_ofs = in_addr_ofs + in_num * sizeof(elem->in_addr[0]);
|
|
size_t out_addr_end = out_addr_ofs + out_num * sizeof(elem->out_addr[0]);
|
|
size_t in_sg_ofs = QEMU_ALIGN_UP(out_addr_end, __alignof__(elem->in_sg[0]));
|
|
size_t out_sg_ofs = in_sg_ofs + in_num * sizeof(elem->in_sg[0]);
|
|
size_t out_sg_end = out_sg_ofs + out_num * sizeof(elem->out_sg[0]);
|
|
|
|
assert(sz >= sizeof(VirtQueueElement));
|
|
elem = g_malloc(out_sg_end);
|
|
trace_virtqueue_alloc_element(elem, sz, in_num, out_num);
|
|
elem->out_num = out_num;
|
|
elem->in_num = in_num;
|
|
elem->in_addr = (void *)elem + in_addr_ofs;
|
|
elem->out_addr = (void *)elem + out_addr_ofs;
|
|
elem->in_sg = (void *)elem + in_sg_ofs;
|
|
elem->out_sg = (void *)elem + out_sg_ofs;
|
|
return elem;
|
|
}
|
|
|
|
void *virtqueue_pop(VirtQueue *vq, size_t sz)
|
|
{
|
|
unsigned int i, head, max;
|
|
VRingMemoryRegionCaches *caches;
|
|
MemoryRegionCache indirect_desc_cache = MEMORY_REGION_CACHE_INVALID;
|
|
MemoryRegionCache *desc_cache;
|
|
int64_t len;
|
|
VirtIODevice *vdev = vq->vdev;
|
|
VirtQueueElement *elem = NULL;
|
|
unsigned out_num, in_num, elem_entries;
|
|
hwaddr addr[VIRTQUEUE_MAX_SIZE];
|
|
struct iovec iov[VIRTQUEUE_MAX_SIZE];
|
|
VRingDesc desc;
|
|
int rc;
|
|
|
|
if (unlikely(vdev->broken)) {
|
|
return NULL;
|
|
}
|
|
rcu_read_lock();
|
|
if (virtio_queue_empty_rcu(vq)) {
|
|
goto done;
|
|
}
|
|
/* Needed after virtio_queue_empty(), see comment in
|
|
* virtqueue_num_heads(). */
|
|
smp_rmb();
|
|
|
|
/* When we start there are none of either input nor output. */
|
|
out_num = in_num = elem_entries = 0;
|
|
|
|
max = vq->vring.num;
|
|
|
|
if (vq->inuse >= vq->vring.num) {
|
|
virtio_error(vdev, "Virtqueue size exceeded");
|
|
goto done;
|
|
}
|
|
|
|
if (!virtqueue_get_head(vq, vq->last_avail_idx++, &head)) {
|
|
goto done;
|
|
}
|
|
|
|
if (virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
|
|
vring_set_avail_event(vq, vq->last_avail_idx);
|
|
}
|
|
|
|
i = head;
|
|
|
|
caches = vring_get_region_caches(vq);
|
|
if (caches->desc.len < max * sizeof(VRingDesc)) {
|
|
virtio_error(vdev, "Cannot map descriptor ring");
|
|
goto done;
|
|
}
|
|
|
|
desc_cache = &caches->desc;
|
|
vring_desc_read(vdev, &desc, desc_cache, i);
|
|
if (desc.flags & VRING_DESC_F_INDIRECT) {
|
|
if (desc.len % sizeof(VRingDesc)) {
|
|
virtio_error(vdev, "Invalid size for indirect buffer table");
|
|
goto done;
|
|
}
|
|
|
|
/* loop over the indirect descriptor table */
|
|
len = address_space_cache_init(&indirect_desc_cache, vdev->dma_as,
|
|
desc.addr, desc.len, false);
|
|
desc_cache = &indirect_desc_cache;
|
|
if (len < desc.len) {
|
|
virtio_error(vdev, "Cannot map indirect buffer");
|
|
goto done;
|
|
}
|
|
|
|
max = desc.len / sizeof(VRingDesc);
|
|
i = 0;
|
|
vring_desc_read(vdev, &desc, desc_cache, i);
|
|
}
|
|
|
|
/* Collect all the descriptors */
|
|
do {
|
|
bool map_ok;
|
|
|
|
if (desc.flags & VRING_DESC_F_WRITE) {
|
|
map_ok = virtqueue_map_desc(vdev, &in_num, addr + out_num,
|
|
iov + out_num,
|
|
VIRTQUEUE_MAX_SIZE - out_num, true,
|
|
desc.addr, desc.len);
|
|
} else {
|
|
if (in_num) {
|
|
virtio_error(vdev, "Incorrect order for descriptors");
|
|
goto err_undo_map;
|
|
}
|
|
map_ok = virtqueue_map_desc(vdev, &out_num, addr, iov,
|
|
VIRTQUEUE_MAX_SIZE, false,
|
|
desc.addr, desc.len);
|
|
}
|
|
if (!map_ok) {
|
|
goto err_undo_map;
|
|
}
|
|
|
|
/* If we've got too many, that implies a descriptor loop. */
|
|
if (++elem_entries > max) {
|
|
virtio_error(vdev, "Looped descriptor");
|
|
goto err_undo_map;
|
|
}
|
|
|
|
rc = virtqueue_read_next_desc(vdev, &desc, desc_cache, max, &i);
|
|
} while (rc == VIRTQUEUE_READ_DESC_MORE);
|
|
|
|
if (rc == VIRTQUEUE_READ_DESC_ERROR) {
|
|
goto err_undo_map;
|
|
}
|
|
|
|
/* Now copy what we have collected and mapped */
|
|
elem = virtqueue_alloc_element(sz, out_num, in_num);
|
|
elem->index = head;
|
|
for (i = 0; i < out_num; i++) {
|
|
elem->out_addr[i] = addr[i];
|
|
elem->out_sg[i] = iov[i];
|
|
}
|
|
for (i = 0; i < in_num; i++) {
|
|
elem->in_addr[i] = addr[out_num + i];
|
|
elem->in_sg[i] = iov[out_num + i];
|
|
}
|
|
|
|
vq->inuse++;
|
|
|
|
trace_virtqueue_pop(vq, elem, elem->in_num, elem->out_num);
|
|
done:
|
|
address_space_cache_destroy(&indirect_desc_cache);
|
|
rcu_read_unlock();
|
|
|
|
return elem;
|
|
|
|
err_undo_map:
|
|
virtqueue_undo_map_desc(out_num, in_num, iov);
|
|
goto done;
|
|
}
|
|
|
|
/* virtqueue_drop_all:
|
|
* @vq: The #VirtQueue
|
|
* Drops all queued buffers and indicates them to the guest
|
|
* as if they are done. Useful when buffers can not be
|
|
* processed but must be returned to the guest.
|
|
*/
|
|
unsigned int virtqueue_drop_all(VirtQueue *vq)
|
|
{
|
|
unsigned int dropped = 0;
|
|
VirtQueueElement elem = {};
|
|
VirtIODevice *vdev = vq->vdev;
|
|
bool fEventIdx = virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX);
|
|
|
|
if (unlikely(vdev->broken)) {
|
|
return 0;
|
|
}
|
|
|
|
while (!virtio_queue_empty(vq) && vq->inuse < vq->vring.num) {
|
|
/* works similar to virtqueue_pop but does not map buffers
|
|
* and does not allocate any memory */
|
|
smp_rmb();
|
|
if (!virtqueue_get_head(vq, vq->last_avail_idx, &elem.index)) {
|
|
break;
|
|
}
|
|
vq->inuse++;
|
|
vq->last_avail_idx++;
|
|
if (fEventIdx) {
|
|
vring_set_avail_event(vq, vq->last_avail_idx);
|
|
}
|
|
/* immediately push the element, nothing to unmap
|
|
* as both in_num and out_num are set to 0 */
|
|
virtqueue_push(vq, &elem, 0);
|
|
dropped++;
|
|
}
|
|
|
|
return dropped;
|
|
}
|
|
|
|
/* Reading and writing a structure directly to QEMUFile is *awful*, but
|
|
* it is what QEMU has always done by mistake. We can change it sooner
|
|
* or later by bumping the version number of the affected vm states.
|
|
* In the meanwhile, since the in-memory layout of VirtQueueElement
|
|
* has changed, we need to marshal to and from the layout that was
|
|
* used before the change.
|
|
*/
|
|
typedef struct VirtQueueElementOld {
|
|
unsigned int index;
|
|
unsigned int out_num;
|
|
unsigned int in_num;
|
|
hwaddr in_addr[VIRTQUEUE_MAX_SIZE];
|
|
hwaddr out_addr[VIRTQUEUE_MAX_SIZE];
|
|
struct iovec in_sg[VIRTQUEUE_MAX_SIZE];
|
|
struct iovec out_sg[VIRTQUEUE_MAX_SIZE];
|
|
} VirtQueueElementOld;
|
|
|
|
void *qemu_get_virtqueue_element(VirtIODevice *vdev, QEMUFile *f, size_t sz)
|
|
{
|
|
VirtQueueElement *elem;
|
|
VirtQueueElementOld data;
|
|
int i;
|
|
|
|
qemu_get_buffer(f, (uint8_t *)&data, sizeof(VirtQueueElementOld));
|
|
|
|
/* TODO: teach all callers that this can fail, and return failure instead
|
|
* of asserting here.
|
|
* This is just one thing (there are probably more) that must be
|
|
* fixed before we can allow NDEBUG compilation.
|
|
*/
|
|
assert(ARRAY_SIZE(data.in_addr) >= data.in_num);
|
|
assert(ARRAY_SIZE(data.out_addr) >= data.out_num);
|
|
|
|
elem = virtqueue_alloc_element(sz, data.out_num, data.in_num);
|
|
elem->index = data.index;
|
|
|
|
for (i = 0; i < elem->in_num; i++) {
|
|
elem->in_addr[i] = data.in_addr[i];
|
|
}
|
|
|
|
for (i = 0; i < elem->out_num; i++) {
|
|
elem->out_addr[i] = data.out_addr[i];
|
|
}
|
|
|
|
for (i = 0; i < elem->in_num; i++) {
|
|
/* Base is overwritten by virtqueue_map. */
|
|
elem->in_sg[i].iov_base = 0;
|
|
elem->in_sg[i].iov_len = data.in_sg[i].iov_len;
|
|
}
|
|
|
|
for (i = 0; i < elem->out_num; i++) {
|
|
/* Base is overwritten by virtqueue_map. */
|
|
elem->out_sg[i].iov_base = 0;
|
|
elem->out_sg[i].iov_len = data.out_sg[i].iov_len;
|
|
}
|
|
|
|
virtqueue_map(vdev, elem);
|
|
return elem;
|
|
}
|
|
|
|
void qemu_put_virtqueue_element(QEMUFile *f, VirtQueueElement *elem)
|
|
{
|
|
VirtQueueElementOld data;
|
|
int i;
|
|
|
|
memset(&data, 0, sizeof(data));
|
|
data.index = elem->index;
|
|
data.in_num = elem->in_num;
|
|
data.out_num = elem->out_num;
|
|
|
|
for (i = 0; i < elem->in_num; i++) {
|
|
data.in_addr[i] = elem->in_addr[i];
|
|
}
|
|
|
|
for (i = 0; i < elem->out_num; i++) {
|
|
data.out_addr[i] = elem->out_addr[i];
|
|
}
|
|
|
|
for (i = 0; i < elem->in_num; i++) {
|
|
/* Base is overwritten by virtqueue_map when loading. Do not
|
|
* save it, as it would leak the QEMU address space layout. */
|
|
data.in_sg[i].iov_len = elem->in_sg[i].iov_len;
|
|
}
|
|
|
|
for (i = 0; i < elem->out_num; i++) {
|
|
/* Do not save iov_base as above. */
|
|
data.out_sg[i].iov_len = elem->out_sg[i].iov_len;
|
|
}
|
|
qemu_put_buffer(f, (uint8_t *)&data, sizeof(VirtQueueElementOld));
|
|
}
|
|
|
|
/* virtio device */
|
|
static void virtio_notify_vector(VirtIODevice *vdev, uint16_t vector)
|
|
{
|
|
BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
|
|
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
|
|
|
|
if (unlikely(vdev->broken)) {
|
|
return;
|
|
}
|
|
|
|
if (k->notify) {
|
|
k->notify(qbus->parent, vector);
|
|
}
|
|
}
|
|
|
|
void virtio_update_irq(VirtIODevice *vdev)
|
|
{
|
|
virtio_notify_vector(vdev, VIRTIO_NO_VECTOR);
|
|
}
|
|
|
|
static int virtio_validate_features(VirtIODevice *vdev)
|
|
{
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
|
|
if (virtio_host_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM) &&
|
|
!virtio_vdev_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM)) {
|
|
return -EFAULT;
|
|
}
|
|
|
|
if (k->validate_features) {
|
|
return k->validate_features(vdev);
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int virtio_set_status(VirtIODevice *vdev, uint8_t val)
|
|
{
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
trace_virtio_set_status(vdev, val);
|
|
|
|
if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
|
|
if (!(vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) &&
|
|
val & VIRTIO_CONFIG_S_FEATURES_OK) {
|
|
int ret = virtio_validate_features(vdev);
|
|
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
if (k->set_status) {
|
|
k->set_status(vdev, val);
|
|
}
|
|
vdev->status = val;
|
|
return 0;
|
|
}
|
|
|
|
bool target_words_bigendian(void);
|
|
static enum virtio_device_endian virtio_default_endian(void)
|
|
{
|
|
if (target_words_bigendian()) {
|
|
return VIRTIO_DEVICE_ENDIAN_BIG;
|
|
} else {
|
|
return VIRTIO_DEVICE_ENDIAN_LITTLE;
|
|
}
|
|
}
|
|
|
|
static enum virtio_device_endian virtio_current_cpu_endian(void)
|
|
{
|
|
CPUClass *cc = CPU_GET_CLASS(current_cpu);
|
|
|
|
if (cc->virtio_is_big_endian(current_cpu)) {
|
|
return VIRTIO_DEVICE_ENDIAN_BIG;
|
|
} else {
|
|
return VIRTIO_DEVICE_ENDIAN_LITTLE;
|
|
}
|
|
}
|
|
|
|
static void virtio_virtqueue_reset_region_cache(struct VirtQueue *vq)
|
|
{
|
|
VRingMemoryRegionCaches *caches;
|
|
|
|
caches = atomic_read(&vq->vring.caches);
|
|
atomic_rcu_set(&vq->vring.caches, NULL);
|
|
if (caches) {
|
|
call_rcu(caches, virtio_free_region_cache, rcu);
|
|
}
|
|
}
|
|
|
|
void virtio_reset(void *opaque)
|
|
{
|
|
VirtIODevice *vdev = opaque;
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
int i;
|
|
|
|
virtio_set_status(vdev, 0);
|
|
if (current_cpu) {
|
|
/* Guest initiated reset */
|
|
vdev->device_endian = virtio_current_cpu_endian();
|
|
} else {
|
|
/* System reset */
|
|
vdev->device_endian = virtio_default_endian();
|
|
}
|
|
|
|
if (k->reset) {
|
|
k->reset(vdev);
|
|
}
|
|
|
|
vdev->broken = false;
|
|
vdev->guest_features = 0;
|
|
vdev->queue_sel = 0;
|
|
vdev->status = 0;
|
|
atomic_set(&vdev->isr, 0);
|
|
vdev->config_vector = VIRTIO_NO_VECTOR;
|
|
virtio_notify_vector(vdev, vdev->config_vector);
|
|
|
|
for(i = 0; i < VIRTIO_QUEUE_MAX; i++) {
|
|
vdev->vq[i].vring.desc = 0;
|
|
vdev->vq[i].vring.avail = 0;
|
|
vdev->vq[i].vring.used = 0;
|
|
vdev->vq[i].last_avail_idx = 0;
|
|
vdev->vq[i].shadow_avail_idx = 0;
|
|
vdev->vq[i].used_idx = 0;
|
|
virtio_queue_set_vector(vdev, i, VIRTIO_NO_VECTOR);
|
|
vdev->vq[i].signalled_used = 0;
|
|
vdev->vq[i].signalled_used_valid = false;
|
|
vdev->vq[i].notification = true;
|
|
vdev->vq[i].vring.num = vdev->vq[i].vring.num_default;
|
|
vdev->vq[i].inuse = 0;
|
|
virtio_virtqueue_reset_region_cache(&vdev->vq[i]);
|
|
}
|
|
}
|
|
|
|
uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr)
|
|
{
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
uint8_t val;
|
|
|
|
if (addr + sizeof(val) > vdev->config_len) {
|
|
return (uint32_t)-1;
|
|
}
|
|
|
|
k->get_config(vdev, vdev->config);
|
|
|
|
val = ldub_p(vdev->config + addr);
|
|
return val;
|
|
}
|
|
|
|
uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr)
|
|
{
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
uint16_t val;
|
|
|
|
if (addr + sizeof(val) > vdev->config_len) {
|
|
return (uint32_t)-1;
|
|
}
|
|
|
|
k->get_config(vdev, vdev->config);
|
|
|
|
val = lduw_p(vdev->config + addr);
|
|
return val;
|
|
}
|
|
|
|
uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr)
|
|
{
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
uint32_t val;
|
|
|
|
if (addr + sizeof(val) > vdev->config_len) {
|
|
return (uint32_t)-1;
|
|
}
|
|
|
|
k->get_config(vdev, vdev->config);
|
|
|
|
val = ldl_p(vdev->config + addr);
|
|
return val;
|
|
}
|
|
|
|
void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
|
{
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
uint8_t val = data;
|
|
|
|
if (addr + sizeof(val) > vdev->config_len) {
|
|
return;
|
|
}
|
|
|
|
stb_p(vdev->config + addr, val);
|
|
|
|
if (k->set_config) {
|
|
k->set_config(vdev, vdev->config);
|
|
}
|
|
}
|
|
|
|
void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
|
{
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
uint16_t val = data;
|
|
|
|
if (addr + sizeof(val) > vdev->config_len) {
|
|
return;
|
|
}
|
|
|
|
stw_p(vdev->config + addr, val);
|
|
|
|
if (k->set_config) {
|
|
k->set_config(vdev, vdev->config);
|
|
}
|
|
}
|
|
|
|
void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data)
|
|
{
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
uint32_t val = data;
|
|
|
|
if (addr + sizeof(val) > vdev->config_len) {
|
|
return;
|
|
}
|
|
|
|
stl_p(vdev->config + addr, val);
|
|
|
|
if (k->set_config) {
|
|
k->set_config(vdev, vdev->config);
|
|
}
|
|
}
|
|
|
|
uint32_t virtio_config_modern_readb(VirtIODevice *vdev, uint32_t addr)
|
|
{
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
uint8_t val;
|
|
|
|
if (addr + sizeof(val) > vdev->config_len) {
|
|
return (uint32_t)-1;
|
|
}
|
|
|
|
k->get_config(vdev, vdev->config);
|
|
|
|
val = ldub_p(vdev->config + addr);
|
|
return val;
|
|
}
|
|
|
|
uint32_t virtio_config_modern_readw(VirtIODevice *vdev, uint32_t addr)
|
|
{
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
uint16_t val;
|
|
|
|
if (addr + sizeof(val) > vdev->config_len) {
|
|
return (uint32_t)-1;
|
|
}
|
|
|
|
k->get_config(vdev, vdev->config);
|
|
|
|
val = lduw_le_p(vdev->config + addr);
|
|
return val;
|
|
}
|
|
|
|
uint32_t virtio_config_modern_readl(VirtIODevice *vdev, uint32_t addr)
|
|
{
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
uint32_t val;
|
|
|
|
if (addr + sizeof(val) > vdev->config_len) {
|
|
return (uint32_t)-1;
|
|
}
|
|
|
|
k->get_config(vdev, vdev->config);
|
|
|
|
val = ldl_le_p(vdev->config + addr);
|
|
return val;
|
|
}
|
|
|
|
void virtio_config_modern_writeb(VirtIODevice *vdev,
|
|
uint32_t addr, uint32_t data)
|
|
{
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
uint8_t val = data;
|
|
|
|
if (addr + sizeof(val) > vdev->config_len) {
|
|
return;
|
|
}
|
|
|
|
stb_p(vdev->config + addr, val);
|
|
|
|
if (k->set_config) {
|
|
k->set_config(vdev, vdev->config);
|
|
}
|
|
}
|
|
|
|
void virtio_config_modern_writew(VirtIODevice *vdev,
|
|
uint32_t addr, uint32_t data)
|
|
{
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
uint16_t val = data;
|
|
|
|
if (addr + sizeof(val) > vdev->config_len) {
|
|
return;
|
|
}
|
|
|
|
stw_le_p(vdev->config + addr, val);
|
|
|
|
if (k->set_config) {
|
|
k->set_config(vdev, vdev->config);
|
|
}
|
|
}
|
|
|
|
void virtio_config_modern_writel(VirtIODevice *vdev,
|
|
uint32_t addr, uint32_t data)
|
|
{
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
uint32_t val = data;
|
|
|
|
if (addr + sizeof(val) > vdev->config_len) {
|
|
return;
|
|
}
|
|
|
|
stl_le_p(vdev->config + addr, val);
|
|
|
|
if (k->set_config) {
|
|
k->set_config(vdev, vdev->config);
|
|
}
|
|
}
|
|
|
|
void virtio_queue_set_addr(VirtIODevice *vdev, int n, hwaddr addr)
|
|
{
|
|
if (!vdev->vq[n].vring.num) {
|
|
return;
|
|
}
|
|
vdev->vq[n].vring.desc = addr;
|
|
virtio_queue_update_rings(vdev, n);
|
|
}
|
|
|
|
hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].vring.desc;
|
|
}
|
|
|
|
void virtio_queue_set_rings(VirtIODevice *vdev, int n, hwaddr desc,
|
|
hwaddr avail, hwaddr used)
|
|
{
|
|
if (!vdev->vq[n].vring.num) {
|
|
return;
|
|
}
|
|
vdev->vq[n].vring.desc = desc;
|
|
vdev->vq[n].vring.avail = avail;
|
|
vdev->vq[n].vring.used = used;
|
|
virtio_init_region_cache(vdev, n);
|
|
}
|
|
|
|
void virtio_queue_set_num(VirtIODevice *vdev, int n, int num)
|
|
{
|
|
/* Don't allow guest to flip queue between existent and
|
|
* nonexistent states, or to set it to an invalid size.
|
|
*/
|
|
if (!!num != !!vdev->vq[n].vring.num ||
|
|
num > VIRTQUEUE_MAX_SIZE ||
|
|
num < 0) {
|
|
return;
|
|
}
|
|
vdev->vq[n].vring.num = num;
|
|
}
|
|
|
|
VirtQueue *virtio_vector_first_queue(VirtIODevice *vdev, uint16_t vector)
|
|
{
|
|
return QLIST_FIRST(&vdev->vector_queues[vector]);
|
|
}
|
|
|
|
VirtQueue *virtio_vector_next_queue(VirtQueue *vq)
|
|
{
|
|
return QLIST_NEXT(vq, node);
|
|
}
|
|
|
|
int virtio_queue_get_num(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].vring.num;
|
|
}
|
|
|
|
int virtio_queue_get_max_num(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].vring.num_default;
|
|
}
|
|
|
|
int virtio_get_num_queues(VirtIODevice *vdev)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
|
|
if (!virtio_queue_get_num(vdev, i)) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return i;
|
|
}
|
|
|
|
void virtio_queue_set_align(VirtIODevice *vdev, int n, int align)
|
|
{
|
|
BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
|
|
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
|
|
|
|
/* virtio-1 compliant devices cannot change the alignment */
|
|
if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
|
|
error_report("tried to modify queue alignment for virtio-1 device");
|
|
return;
|
|
}
|
|
/* Check that the transport told us it was going to do this
|
|
* (so a buggy transport will immediately assert rather than
|
|
* silently failing to migrate this state)
|
|
*/
|
|
assert(k->has_variable_vring_alignment);
|
|
|
|
if (align) {
|
|
vdev->vq[n].vring.align = align;
|
|
virtio_queue_update_rings(vdev, n);
|
|
}
|
|
}
|
|
|
|
static bool virtio_queue_notify_aio_vq(VirtQueue *vq)
|
|
{
|
|
if (vq->vring.desc && vq->handle_aio_output) {
|
|
VirtIODevice *vdev = vq->vdev;
|
|
|
|
trace_virtio_queue_notify(vdev, vq - vdev->vq, vq);
|
|
return vq->handle_aio_output(vdev, vq);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static void virtio_queue_notify_vq(VirtQueue *vq)
|
|
{
|
|
if (vq->vring.desc && vq->handle_output) {
|
|
VirtIODevice *vdev = vq->vdev;
|
|
|
|
if (unlikely(vdev->broken)) {
|
|
return;
|
|
}
|
|
|
|
trace_virtio_queue_notify(vdev, vq - vdev->vq, vq);
|
|
vq->handle_output(vdev, vq);
|
|
}
|
|
}
|
|
|
|
void virtio_queue_notify(VirtIODevice *vdev, int n)
|
|
{
|
|
VirtQueue *vq = &vdev->vq[n];
|
|
|
|
if (unlikely(!vq->vring.desc || vdev->broken)) {
|
|
return;
|
|
}
|
|
|
|
trace_virtio_queue_notify(vdev, vq - vdev->vq, vq);
|
|
if (vq->handle_aio_output) {
|
|
event_notifier_set(&vq->host_notifier);
|
|
} else if (vq->handle_output) {
|
|
vq->handle_output(vdev, vq);
|
|
}
|
|
}
|
|
|
|
uint16_t virtio_queue_vector(VirtIODevice *vdev, int n)
|
|
{
|
|
return n < VIRTIO_QUEUE_MAX ? vdev->vq[n].vector :
|
|
VIRTIO_NO_VECTOR;
|
|
}
|
|
|
|
void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector)
|
|
{
|
|
VirtQueue *vq = &vdev->vq[n];
|
|
|
|
if (n < VIRTIO_QUEUE_MAX) {
|
|
if (vdev->vector_queues &&
|
|
vdev->vq[n].vector != VIRTIO_NO_VECTOR) {
|
|
QLIST_REMOVE(vq, node);
|
|
}
|
|
vdev->vq[n].vector = vector;
|
|
if (vdev->vector_queues &&
|
|
vector != VIRTIO_NO_VECTOR) {
|
|
QLIST_INSERT_HEAD(&vdev->vector_queues[vector], vq, node);
|
|
}
|
|
}
|
|
}
|
|
|
|
VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
|
|
VirtIOHandleOutput handle_output)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
|
|
if (vdev->vq[i].vring.num == 0)
|
|
break;
|
|
}
|
|
|
|
if (i == VIRTIO_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE)
|
|
abort();
|
|
|
|
vdev->vq[i].vring.num = queue_size;
|
|
vdev->vq[i].vring.num_default = queue_size;
|
|
vdev->vq[i].vring.align = VIRTIO_PCI_VRING_ALIGN;
|
|
vdev->vq[i].handle_output = handle_output;
|
|
vdev->vq[i].handle_aio_output = NULL;
|
|
|
|
return &vdev->vq[i];
|
|
}
|
|
|
|
void virtio_del_queue(VirtIODevice *vdev, int n)
|
|
{
|
|
if (n < 0 || n >= VIRTIO_QUEUE_MAX) {
|
|
abort();
|
|
}
|
|
|
|
vdev->vq[n].vring.num = 0;
|
|
vdev->vq[n].vring.num_default = 0;
|
|
}
|
|
|
|
static void virtio_set_isr(VirtIODevice *vdev, int value)
|
|
{
|
|
uint8_t old = atomic_read(&vdev->isr);
|
|
|
|
/* Do not write ISR if it does not change, so that its cacheline remains
|
|
* shared in the common case where the guest does not read it.
|
|
*/
|
|
if ((old & value) != value) {
|
|
atomic_or(&vdev->isr, value);
|
|
}
|
|
}
|
|
|
|
/* Called within rcu_read_lock(). */
|
|
static bool virtio_should_notify(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
uint16_t old, new;
|
|
bool v;
|
|
/* We need to expose used array entries before checking used event. */
|
|
smp_mb();
|
|
/* Always notify when queue is empty (when feature acknowledge) */
|
|
if (virtio_vdev_has_feature(vdev, VIRTIO_F_NOTIFY_ON_EMPTY) &&
|
|
!vq->inuse && virtio_queue_empty(vq)) {
|
|
return true;
|
|
}
|
|
|
|
if (!virtio_vdev_has_feature(vdev, VIRTIO_RING_F_EVENT_IDX)) {
|
|
return !(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT);
|
|
}
|
|
|
|
v = vq->signalled_used_valid;
|
|
vq->signalled_used_valid = true;
|
|
old = vq->signalled_used;
|
|
new = vq->signalled_used = vq->used_idx;
|
|
return !v || vring_need_event(vring_get_used_event(vq), new, old);
|
|
}
|
|
|
|
void virtio_notify_irqfd(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
bool should_notify;
|
|
rcu_read_lock();
|
|
should_notify = virtio_should_notify(vdev, vq);
|
|
rcu_read_unlock();
|
|
|
|
if (!should_notify) {
|
|
return;
|
|
}
|
|
|
|
trace_virtio_notify_irqfd(vdev, vq);
|
|
|
|
/*
|
|
* virtio spec 1.0 says ISR bit 0 should be ignored with MSI, but
|
|
* windows drivers included in virtio-win 1.8.0 (circa 2015) are
|
|
* incorrectly polling this bit during crashdump and hibernation
|
|
* in MSI mode, causing a hang if this bit is never updated.
|
|
* Recent releases of Windows do not really shut down, but rather
|
|
* log out and hibernate to make the next startup faster. Hence,
|
|
* this manifested as a more serious hang during shutdown with
|
|
*
|
|
* Next driver release from 2016 fixed this problem, so working around it
|
|
* is not a must, but it's easy to do so let's do it here.
|
|
*
|
|
* Note: it's safe to update ISR from any thread as it was switched
|
|
* to an atomic operation.
|
|
*/
|
|
virtio_set_isr(vq->vdev, 0x1);
|
|
event_notifier_set(&vq->guest_notifier);
|
|
}
|
|
|
|
static void virtio_irq(VirtQueue *vq)
|
|
{
|
|
virtio_set_isr(vq->vdev, 0x1);
|
|
virtio_notify_vector(vq->vdev, vq->vector);
|
|
}
|
|
|
|
void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
bool should_notify;
|
|
rcu_read_lock();
|
|
should_notify = virtio_should_notify(vdev, vq);
|
|
rcu_read_unlock();
|
|
|
|
if (!should_notify) {
|
|
return;
|
|
}
|
|
|
|
trace_virtio_notify(vdev, vq);
|
|
virtio_irq(vq);
|
|
}
|
|
|
|
void virtio_notify_config(VirtIODevice *vdev)
|
|
{
|
|
if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))
|
|
return;
|
|
|
|
virtio_set_isr(vdev, 0x3);
|
|
vdev->generation++;
|
|
virtio_notify_vector(vdev, vdev->config_vector);
|
|
}
|
|
|
|
static bool virtio_device_endian_needed(void *opaque)
|
|
{
|
|
VirtIODevice *vdev = opaque;
|
|
|
|
assert(vdev->device_endian != VIRTIO_DEVICE_ENDIAN_UNKNOWN);
|
|
if (!virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
|
|
return vdev->device_endian != virtio_default_endian();
|
|
}
|
|
/* Devices conforming to VIRTIO 1.0 or later are always LE. */
|
|
return vdev->device_endian != VIRTIO_DEVICE_ENDIAN_LITTLE;
|
|
}
|
|
|
|
static bool virtio_64bit_features_needed(void *opaque)
|
|
{
|
|
VirtIODevice *vdev = opaque;
|
|
|
|
return (vdev->host_features >> 32) != 0;
|
|
}
|
|
|
|
static bool virtio_virtqueue_needed(void *opaque)
|
|
{
|
|
VirtIODevice *vdev = opaque;
|
|
|
|
return virtio_host_has_feature(vdev, VIRTIO_F_VERSION_1);
|
|
}
|
|
|
|
static bool virtio_ringsize_needed(void *opaque)
|
|
{
|
|
VirtIODevice *vdev = opaque;
|
|
int i;
|
|
|
|
for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
|
|
if (vdev->vq[i].vring.num != vdev->vq[i].vring.num_default) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static bool virtio_extra_state_needed(void *opaque)
|
|
{
|
|
VirtIODevice *vdev = opaque;
|
|
BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
|
|
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
|
|
|
|
return k->has_extra_state &&
|
|
k->has_extra_state(qbus->parent);
|
|
}
|
|
|
|
static bool virtio_broken_needed(void *opaque)
|
|
{
|
|
VirtIODevice *vdev = opaque;
|
|
|
|
return vdev->broken;
|
|
}
|
|
|
|
static const VMStateDescription vmstate_virtqueue = {
|
|
.name = "virtqueue_state",
|
|
.version_id = 1,
|
|
.minimum_version_id = 1,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_UINT64(vring.avail, struct VirtQueue),
|
|
VMSTATE_UINT64(vring.used, struct VirtQueue),
|
|
VMSTATE_END_OF_LIST()
|
|
}
|
|
};
|
|
|
|
static const VMStateDescription vmstate_virtio_virtqueues = {
|
|
.name = "virtio/virtqueues",
|
|
.version_id = 1,
|
|
.minimum_version_id = 1,
|
|
.needed = &virtio_virtqueue_needed,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq, struct VirtIODevice,
|
|
VIRTIO_QUEUE_MAX, 0, vmstate_virtqueue, VirtQueue),
|
|
VMSTATE_END_OF_LIST()
|
|
}
|
|
};
|
|
|
|
static const VMStateDescription vmstate_ringsize = {
|
|
.name = "ringsize_state",
|
|
.version_id = 1,
|
|
.minimum_version_id = 1,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_UINT32(vring.num_default, struct VirtQueue),
|
|
VMSTATE_END_OF_LIST()
|
|
}
|
|
};
|
|
|
|
static const VMStateDescription vmstate_virtio_ringsize = {
|
|
.name = "virtio/ringsize",
|
|
.version_id = 1,
|
|
.minimum_version_id = 1,
|
|
.needed = &virtio_ringsize_needed,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_STRUCT_VARRAY_POINTER_KNOWN(vq, struct VirtIODevice,
|
|
VIRTIO_QUEUE_MAX, 0, vmstate_ringsize, VirtQueue),
|
|
VMSTATE_END_OF_LIST()
|
|
}
|
|
};
|
|
|
|
static int get_extra_state(QEMUFile *f, void *pv, size_t size,
|
|
VMStateField *field)
|
|
{
|
|
VirtIODevice *vdev = pv;
|
|
BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
|
|
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
|
|
|
|
if (!k->load_extra_state) {
|
|
return -1;
|
|
} else {
|
|
return k->load_extra_state(qbus->parent, f);
|
|
}
|
|
}
|
|
|
|
static int put_extra_state(QEMUFile *f, void *pv, size_t size,
|
|
VMStateField *field, QJSON *vmdesc)
|
|
{
|
|
VirtIODevice *vdev = pv;
|
|
BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
|
|
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
|
|
|
|
k->save_extra_state(qbus->parent, f);
|
|
return 0;
|
|
}
|
|
|
|
static const VMStateInfo vmstate_info_extra_state = {
|
|
.name = "virtqueue_extra_state",
|
|
.get = get_extra_state,
|
|
.put = put_extra_state,
|
|
};
|
|
|
|
static const VMStateDescription vmstate_virtio_extra_state = {
|
|
.name = "virtio/extra_state",
|
|
.version_id = 1,
|
|
.minimum_version_id = 1,
|
|
.needed = &virtio_extra_state_needed,
|
|
.fields = (VMStateField[]) {
|
|
{
|
|
.name = "extra_state",
|
|
.version_id = 0,
|
|
.field_exists = NULL,
|
|
.size = 0,
|
|
.info = &vmstate_info_extra_state,
|
|
.flags = VMS_SINGLE,
|
|
.offset = 0,
|
|
},
|
|
VMSTATE_END_OF_LIST()
|
|
}
|
|
};
|
|
|
|
static const VMStateDescription vmstate_virtio_device_endian = {
|
|
.name = "virtio/device_endian",
|
|
.version_id = 1,
|
|
.minimum_version_id = 1,
|
|
.needed = &virtio_device_endian_needed,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_UINT8(device_endian, VirtIODevice),
|
|
VMSTATE_END_OF_LIST()
|
|
}
|
|
};
|
|
|
|
static const VMStateDescription vmstate_virtio_64bit_features = {
|
|
.name = "virtio/64bit_features",
|
|
.version_id = 1,
|
|
.minimum_version_id = 1,
|
|
.needed = &virtio_64bit_features_needed,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_UINT64(guest_features, VirtIODevice),
|
|
VMSTATE_END_OF_LIST()
|
|
}
|
|
};
|
|
|
|
static const VMStateDescription vmstate_virtio_broken = {
|
|
.name = "virtio/broken",
|
|
.version_id = 1,
|
|
.minimum_version_id = 1,
|
|
.needed = &virtio_broken_needed,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_BOOL(broken, VirtIODevice),
|
|
VMSTATE_END_OF_LIST()
|
|
}
|
|
};
|
|
|
|
static const VMStateDescription vmstate_virtio = {
|
|
.name = "virtio",
|
|
.version_id = 1,
|
|
.minimum_version_id = 1,
|
|
.minimum_version_id_old = 1,
|
|
.fields = (VMStateField[]) {
|
|
VMSTATE_END_OF_LIST()
|
|
},
|
|
.subsections = (const VMStateDescription*[]) {
|
|
&vmstate_virtio_device_endian,
|
|
&vmstate_virtio_64bit_features,
|
|
&vmstate_virtio_virtqueues,
|
|
&vmstate_virtio_ringsize,
|
|
&vmstate_virtio_broken,
|
|
&vmstate_virtio_extra_state,
|
|
NULL
|
|
}
|
|
};
|
|
|
|
int virtio_save(VirtIODevice *vdev, QEMUFile *f)
|
|
{
|
|
BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
|
|
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
uint32_t guest_features_lo = (vdev->guest_features & 0xffffffff);
|
|
int i;
|
|
|
|
if (k->save_config) {
|
|
k->save_config(qbus->parent, f);
|
|
}
|
|
|
|
qemu_put_8s(f, &vdev->status);
|
|
qemu_put_8s(f, &vdev->isr);
|
|
qemu_put_be16s(f, &vdev->queue_sel);
|
|
qemu_put_be32s(f, &guest_features_lo);
|
|
qemu_put_be32(f, vdev->config_len);
|
|
qemu_put_buffer(f, vdev->config, vdev->config_len);
|
|
|
|
for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
|
|
if (vdev->vq[i].vring.num == 0)
|
|
break;
|
|
}
|
|
|
|
qemu_put_be32(f, i);
|
|
|
|
for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
|
|
if (vdev->vq[i].vring.num == 0)
|
|
break;
|
|
|
|
qemu_put_be32(f, vdev->vq[i].vring.num);
|
|
if (k->has_variable_vring_alignment) {
|
|
qemu_put_be32(f, vdev->vq[i].vring.align);
|
|
}
|
|
/*
|
|
* Save desc now, the rest of the ring addresses are saved in
|
|
* subsections for VIRTIO-1 devices.
|
|
*/
|
|
qemu_put_be64(f, vdev->vq[i].vring.desc);
|
|
qemu_put_be16s(f, &vdev->vq[i].last_avail_idx);
|
|
if (k->save_queue) {
|
|
k->save_queue(qbus->parent, i, f);
|
|
}
|
|
}
|
|
|
|
if (vdc->save != NULL) {
|
|
vdc->save(vdev, f);
|
|
}
|
|
|
|
if (vdc->vmsd) {
|
|
int ret = vmstate_save_state(f, vdc->vmsd, vdev, NULL);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/* Subsections */
|
|
return vmstate_save_state(f, &vmstate_virtio, vdev, NULL);
|
|
}
|
|
|
|
/* A wrapper for use as a VMState .put function */
|
|
static int virtio_device_put(QEMUFile *f, void *opaque, size_t size,
|
|
VMStateField *field, QJSON *vmdesc)
|
|
{
|
|
return virtio_save(VIRTIO_DEVICE(opaque), f);
|
|
}
|
|
|
|
/* A wrapper for use as a VMState .get function */
|
|
static int virtio_device_get(QEMUFile *f, void *opaque, size_t size,
|
|
VMStateField *field)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
|
|
DeviceClass *dc = DEVICE_CLASS(VIRTIO_DEVICE_GET_CLASS(vdev));
|
|
|
|
return virtio_load(vdev, f, dc->vmsd->version_id);
|
|
}
|
|
|
|
const VMStateInfo virtio_vmstate_info = {
|
|
.name = "virtio",
|
|
.get = virtio_device_get,
|
|
.put = virtio_device_put,
|
|
};
|
|
|
|
static int virtio_set_features_nocheck(VirtIODevice *vdev, uint64_t val)
|
|
{
|
|
VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
bool bad = (val & ~(vdev->host_features)) != 0;
|
|
|
|
val &= vdev->host_features;
|
|
if (k->set_features) {
|
|
k->set_features(vdev, val);
|
|
}
|
|
vdev->guest_features = val;
|
|
return bad ? -1 : 0;
|
|
}
|
|
|
|
int virtio_set_features(VirtIODevice *vdev, uint64_t val)
|
|
{
|
|
/*
|
|
* The driver must not attempt to set features after feature negotiation
|
|
* has finished.
|
|
*/
|
|
if (vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) {
|
|
return -EINVAL;
|
|
}
|
|
return virtio_set_features_nocheck(vdev, val);
|
|
}
|
|
|
|
int virtio_load(VirtIODevice *vdev, QEMUFile *f, int version_id)
|
|
{
|
|
int i, ret;
|
|
int32_t config_len;
|
|
uint32_t num;
|
|
uint32_t features;
|
|
BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
|
|
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
|
|
|
|
/*
|
|
* We poison the endianness to ensure it does not get used before
|
|
* subsections have been loaded.
|
|
*/
|
|
vdev->device_endian = VIRTIO_DEVICE_ENDIAN_UNKNOWN;
|
|
|
|
if (k->load_config) {
|
|
ret = k->load_config(qbus->parent, f);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
qemu_get_8s(f, &vdev->status);
|
|
qemu_get_8s(f, &vdev->isr);
|
|
qemu_get_be16s(f, &vdev->queue_sel);
|
|
if (vdev->queue_sel >= VIRTIO_QUEUE_MAX) {
|
|
return -1;
|
|
}
|
|
qemu_get_be32s(f, &features);
|
|
|
|
/*
|
|
* Temporarily set guest_features low bits - needed by
|
|
* virtio net load code testing for VIRTIO_NET_F_CTRL_GUEST_OFFLOADS
|
|
* VIRTIO_NET_F_GUEST_ANNOUNCE and VIRTIO_NET_F_CTRL_VQ.
|
|
*
|
|
* Note: devices should always test host features in future - don't create
|
|
* new dependencies like this.
|
|
*/
|
|
vdev->guest_features = features;
|
|
|
|
config_len = qemu_get_be32(f);
|
|
|
|
/*
|
|
* There are cases where the incoming config can be bigger or smaller
|
|
* than what we have; so load what we have space for, and skip
|
|
* any excess that's in the stream.
|
|
*/
|
|
qemu_get_buffer(f, vdev->config, MIN(config_len, vdev->config_len));
|
|
|
|
while (config_len > vdev->config_len) {
|
|
qemu_get_byte(f);
|
|
config_len--;
|
|
}
|
|
|
|
num = qemu_get_be32(f);
|
|
|
|
if (num > VIRTIO_QUEUE_MAX) {
|
|
error_report("Invalid number of virtqueues: 0x%x", num);
|
|
return -1;
|
|
}
|
|
|
|
for (i = 0; i < num; i++) {
|
|
vdev->vq[i].vring.num = qemu_get_be32(f);
|
|
if (k->has_variable_vring_alignment) {
|
|
vdev->vq[i].vring.align = qemu_get_be32(f);
|
|
}
|
|
vdev->vq[i].vring.desc = qemu_get_be64(f);
|
|
qemu_get_be16s(f, &vdev->vq[i].last_avail_idx);
|
|
vdev->vq[i].signalled_used_valid = false;
|
|
vdev->vq[i].notification = true;
|
|
|
|
if (!vdev->vq[i].vring.desc && vdev->vq[i].last_avail_idx) {
|
|
error_report("VQ %d address 0x0 "
|
|
"inconsistent with Host index 0x%x",
|
|
i, vdev->vq[i].last_avail_idx);
|
|
return -1;
|
|
}
|
|
if (k->load_queue) {
|
|
ret = k->load_queue(qbus->parent, i, f);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
virtio_notify_vector(vdev, VIRTIO_NO_VECTOR);
|
|
|
|
if (vdc->load != NULL) {
|
|
ret = vdc->load(vdev, f, version_id);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (vdc->vmsd) {
|
|
ret = vmstate_load_state(f, vdc->vmsd, vdev, version_id);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/* Subsections */
|
|
ret = vmstate_load_state(f, &vmstate_virtio, vdev, 1);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
if (vdev->device_endian == VIRTIO_DEVICE_ENDIAN_UNKNOWN) {
|
|
vdev->device_endian = virtio_default_endian();
|
|
}
|
|
|
|
if (virtio_64bit_features_needed(vdev)) {
|
|
/*
|
|
* Subsection load filled vdev->guest_features. Run them
|
|
* through virtio_set_features to sanity-check them against
|
|
* host_features.
|
|
*/
|
|
uint64_t features64 = vdev->guest_features;
|
|
if (virtio_set_features_nocheck(vdev, features64) < 0) {
|
|
error_report("Features 0x%" PRIx64 " unsupported. "
|
|
"Allowed features: 0x%" PRIx64,
|
|
features64, vdev->host_features);
|
|
return -1;
|
|
}
|
|
} else {
|
|
if (virtio_set_features_nocheck(vdev, features) < 0) {
|
|
error_report("Features 0x%x unsupported. "
|
|
"Allowed features: 0x%" PRIx64,
|
|
features, vdev->host_features);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
rcu_read_lock();
|
|
for (i = 0; i < num; i++) {
|
|
if (vdev->vq[i].vring.desc) {
|
|
uint16_t nheads;
|
|
|
|
/*
|
|
* VIRTIO-1 devices migrate desc, used, and avail ring addresses so
|
|
* only the region cache needs to be set up. Legacy devices need
|
|
* to calculate used and avail ring addresses based on the desc
|
|
* address.
|
|
*/
|
|
if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
|
|
virtio_init_region_cache(vdev, i);
|
|
} else {
|
|
virtio_queue_update_rings(vdev, i);
|
|
}
|
|
|
|
nheads = vring_avail_idx(&vdev->vq[i]) - vdev->vq[i].last_avail_idx;
|
|
/* Check it isn't doing strange things with descriptor numbers. */
|
|
if (nheads > vdev->vq[i].vring.num) {
|
|
error_report("VQ %d size 0x%x Guest index 0x%x "
|
|
"inconsistent with Host index 0x%x: delta 0x%x",
|
|
i, vdev->vq[i].vring.num,
|
|
vring_avail_idx(&vdev->vq[i]),
|
|
vdev->vq[i].last_avail_idx, nheads);
|
|
return -1;
|
|
}
|
|
vdev->vq[i].used_idx = vring_used_idx(&vdev->vq[i]);
|
|
vdev->vq[i].shadow_avail_idx = vring_avail_idx(&vdev->vq[i]);
|
|
|
|
/*
|
|
* Some devices migrate VirtQueueElements that have been popped
|
|
* from the avail ring but not yet returned to the used ring.
|
|
* Since max ring size < UINT16_MAX it's safe to use modulo
|
|
* UINT16_MAX + 1 subtraction.
|
|
*/
|
|
vdev->vq[i].inuse = (uint16_t)(vdev->vq[i].last_avail_idx -
|
|
vdev->vq[i].used_idx);
|
|
if (vdev->vq[i].inuse > vdev->vq[i].vring.num) {
|
|
error_report("VQ %d size 0x%x < last_avail_idx 0x%x - "
|
|
"used_idx 0x%x",
|
|
i, vdev->vq[i].vring.num,
|
|
vdev->vq[i].last_avail_idx,
|
|
vdev->vq[i].used_idx);
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return 0;
|
|
}
|
|
|
|
void virtio_cleanup(VirtIODevice *vdev)
|
|
{
|
|
qemu_del_vm_change_state_handler(vdev->vmstate);
|
|
}
|
|
|
|
static void virtio_vmstate_change(void *opaque, int running, RunState state)
|
|
{
|
|
VirtIODevice *vdev = opaque;
|
|
BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
|
|
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
|
|
bool backend_run = running && (vdev->status & VIRTIO_CONFIG_S_DRIVER_OK);
|
|
vdev->vm_running = running;
|
|
|
|
if (backend_run) {
|
|
virtio_set_status(vdev, vdev->status);
|
|
}
|
|
|
|
if (k->vmstate_change) {
|
|
k->vmstate_change(qbus->parent, backend_run);
|
|
}
|
|
|
|
if (!backend_run) {
|
|
virtio_set_status(vdev, vdev->status);
|
|
}
|
|
}
|
|
|
|
void virtio_instance_init_common(Object *proxy_obj, void *data,
|
|
size_t vdev_size, const char *vdev_name)
|
|
{
|
|
DeviceState *vdev = data;
|
|
|
|
object_initialize(vdev, vdev_size, vdev_name);
|
|
object_property_add_child(proxy_obj, "virtio-backend", OBJECT(vdev), NULL);
|
|
object_unref(OBJECT(vdev));
|
|
qdev_alias_all_properties(vdev, proxy_obj);
|
|
}
|
|
|
|
void virtio_init(VirtIODevice *vdev, const char *name,
|
|
uint16_t device_id, size_t config_size)
|
|
{
|
|
BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
|
|
VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus);
|
|
int i;
|
|
int nvectors = k->query_nvectors ? k->query_nvectors(qbus->parent) : 0;
|
|
|
|
if (nvectors) {
|
|
vdev->vector_queues =
|
|
g_malloc0(sizeof(*vdev->vector_queues) * nvectors);
|
|
}
|
|
|
|
vdev->device_id = device_id;
|
|
vdev->status = 0;
|
|
atomic_set(&vdev->isr, 0);
|
|
vdev->queue_sel = 0;
|
|
vdev->config_vector = VIRTIO_NO_VECTOR;
|
|
vdev->vq = g_malloc0(sizeof(VirtQueue) * VIRTIO_QUEUE_MAX);
|
|
vdev->vm_running = runstate_is_running();
|
|
vdev->broken = false;
|
|
for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
|
|
vdev->vq[i].vector = VIRTIO_NO_VECTOR;
|
|
vdev->vq[i].vdev = vdev;
|
|
vdev->vq[i].queue_index = i;
|
|
}
|
|
|
|
vdev->name = name;
|
|
vdev->config_len = config_size;
|
|
if (vdev->config_len) {
|
|
vdev->config = g_malloc0(config_size);
|
|
} else {
|
|
vdev->config = NULL;
|
|
}
|
|
vdev->vmstate = qemu_add_vm_change_state_handler(virtio_vmstate_change,
|
|
vdev);
|
|
vdev->device_endian = virtio_default_endian();
|
|
vdev->use_guest_notifier_mask = true;
|
|
}
|
|
|
|
hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].vring.desc;
|
|
}
|
|
|
|
hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].vring.avail;
|
|
}
|
|
|
|
hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].vring.used;
|
|
}
|
|
|
|
hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n)
|
|
{
|
|
return sizeof(VRingDesc) * vdev->vq[n].vring.num;
|
|
}
|
|
|
|
hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n)
|
|
{
|
|
return offsetof(VRingAvail, ring) +
|
|
sizeof(uint16_t) * vdev->vq[n].vring.num;
|
|
}
|
|
|
|
hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n)
|
|
{
|
|
return offsetof(VRingUsed, ring) +
|
|
sizeof(VRingUsedElem) * vdev->vq[n].vring.num;
|
|
}
|
|
|
|
uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq[n].last_avail_idx;
|
|
}
|
|
|
|
void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx)
|
|
{
|
|
vdev->vq[n].last_avail_idx = idx;
|
|
vdev->vq[n].shadow_avail_idx = idx;
|
|
}
|
|
|
|
void virtio_queue_restore_last_avail_idx(VirtIODevice *vdev, int n)
|
|
{
|
|
rcu_read_lock();
|
|
if (vdev->vq[n].vring.desc) {
|
|
vdev->vq[n].last_avail_idx = vring_used_idx(&vdev->vq[n]);
|
|
vdev->vq[n].shadow_avail_idx = vdev->vq[n].last_avail_idx;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
void virtio_queue_update_used_idx(VirtIODevice *vdev, int n)
|
|
{
|
|
rcu_read_lock();
|
|
if (vdev->vq[n].vring.desc) {
|
|
vdev->vq[n].used_idx = vring_used_idx(&vdev->vq[n]);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n)
|
|
{
|
|
vdev->vq[n].signalled_used_valid = false;
|
|
}
|
|
|
|
VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n)
|
|
{
|
|
return vdev->vq + n;
|
|
}
|
|
|
|
uint16_t virtio_get_queue_index(VirtQueue *vq)
|
|
{
|
|
return vq->queue_index;
|
|
}
|
|
|
|
static void virtio_queue_guest_notifier_read(EventNotifier *n)
|
|
{
|
|
VirtQueue *vq = container_of(n, VirtQueue, guest_notifier);
|
|
if (event_notifier_test_and_clear(n)) {
|
|
virtio_irq(vq);
|
|
}
|
|
}
|
|
|
|
void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign,
|
|
bool with_irqfd)
|
|
{
|
|
if (assign && !with_irqfd) {
|
|
event_notifier_set_handler(&vq->guest_notifier,
|
|
virtio_queue_guest_notifier_read);
|
|
} else {
|
|
event_notifier_set_handler(&vq->guest_notifier, NULL);
|
|
}
|
|
if (!assign) {
|
|
/* Test and clear notifier before closing it,
|
|
* in case poll callback didn't have time to run. */
|
|
virtio_queue_guest_notifier_read(&vq->guest_notifier);
|
|
}
|
|
}
|
|
|
|
EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq)
|
|
{
|
|
return &vq->guest_notifier;
|
|
}
|
|
|
|
static void virtio_queue_host_notifier_aio_read(EventNotifier *n)
|
|
{
|
|
VirtQueue *vq = container_of(n, VirtQueue, host_notifier);
|
|
if (event_notifier_test_and_clear(n)) {
|
|
virtio_queue_notify_aio_vq(vq);
|
|
}
|
|
}
|
|
|
|
static void virtio_queue_host_notifier_aio_poll_begin(EventNotifier *n)
|
|
{
|
|
VirtQueue *vq = container_of(n, VirtQueue, host_notifier);
|
|
|
|
virtio_queue_set_notification(vq, 0);
|
|
}
|
|
|
|
static bool virtio_queue_host_notifier_aio_poll(void *opaque)
|
|
{
|
|
EventNotifier *n = opaque;
|
|
VirtQueue *vq = container_of(n, VirtQueue, host_notifier);
|
|
bool progress;
|
|
|
|
if (!vq->vring.desc || virtio_queue_empty(vq)) {
|
|
return false;
|
|
}
|
|
|
|
progress = virtio_queue_notify_aio_vq(vq);
|
|
|
|
/* In case the handler function re-enabled notifications */
|
|
virtio_queue_set_notification(vq, 0);
|
|
return progress;
|
|
}
|
|
|
|
static void virtio_queue_host_notifier_aio_poll_end(EventNotifier *n)
|
|
{
|
|
VirtQueue *vq = container_of(n, VirtQueue, host_notifier);
|
|
|
|
/* Caller polls once more after this to catch requests that race with us */
|
|
virtio_queue_set_notification(vq, 1);
|
|
}
|
|
|
|
void virtio_queue_aio_set_host_notifier_handler(VirtQueue *vq, AioContext *ctx,
|
|
VirtIOHandleAIOOutput handle_output)
|
|
{
|
|
if (handle_output) {
|
|
vq->handle_aio_output = handle_output;
|
|
aio_set_event_notifier(ctx, &vq->host_notifier, true,
|
|
virtio_queue_host_notifier_aio_read,
|
|
virtio_queue_host_notifier_aio_poll);
|
|
aio_set_event_notifier_poll(ctx, &vq->host_notifier,
|
|
virtio_queue_host_notifier_aio_poll_begin,
|
|
virtio_queue_host_notifier_aio_poll_end);
|
|
} else {
|
|
aio_set_event_notifier(ctx, &vq->host_notifier, true, NULL, NULL);
|
|
/* Test and clear notifier before after disabling event,
|
|
* in case poll callback didn't have time to run. */
|
|
virtio_queue_host_notifier_aio_read(&vq->host_notifier);
|
|
vq->handle_aio_output = NULL;
|
|
}
|
|
}
|
|
|
|
void virtio_queue_host_notifier_read(EventNotifier *n)
|
|
{
|
|
VirtQueue *vq = container_of(n, VirtQueue, host_notifier);
|
|
if (event_notifier_test_and_clear(n)) {
|
|
virtio_queue_notify_vq(vq);
|
|
}
|
|
}
|
|
|
|
EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq)
|
|
{
|
|
return &vq->host_notifier;
|
|
}
|
|
|
|
void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name)
|
|
{
|
|
g_free(vdev->bus_name);
|
|
vdev->bus_name = g_strdup(bus_name);
|
|
}
|
|
|
|
void GCC_FMT_ATTR(2, 3) virtio_error(VirtIODevice *vdev, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
va_start(ap, fmt);
|
|
error_vreport(fmt, ap);
|
|
va_end(ap);
|
|
|
|
if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
|
|
vdev->status = vdev->status | VIRTIO_CONFIG_S_NEEDS_RESET;
|
|
virtio_notify_config(vdev);
|
|
}
|
|
|
|
vdev->broken = true;
|
|
}
|
|
|
|
static void virtio_memory_listener_commit(MemoryListener *listener)
|
|
{
|
|
VirtIODevice *vdev = container_of(listener, VirtIODevice, listener);
|
|
int i;
|
|
|
|
for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
|
|
if (vdev->vq[i].vring.num == 0) {
|
|
break;
|
|
}
|
|
virtio_init_region_cache(vdev, i);
|
|
}
|
|
}
|
|
|
|
static void virtio_device_realize(DeviceState *dev, Error **errp)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev);
|
|
Error *err = NULL;
|
|
|
|
/* Devices should either use vmsd or the load/save methods */
|
|
assert(!vdc->vmsd || !vdc->load);
|
|
|
|
if (vdc->realize != NULL) {
|
|
vdc->realize(dev, &err);
|
|
if (err != NULL) {
|
|
error_propagate(errp, err);
|
|
return;
|
|
}
|
|
}
|
|
|
|
virtio_bus_device_plugged(vdev, &err);
|
|
if (err != NULL) {
|
|
error_propagate(errp, err);
|
|
vdc->unrealize(dev, NULL);
|
|
return;
|
|
}
|
|
|
|
vdev->listener.commit = virtio_memory_listener_commit;
|
|
memory_listener_register(&vdev->listener, vdev->dma_as);
|
|
}
|
|
|
|
static void virtio_device_unrealize(DeviceState *dev, Error **errp)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(dev);
|
|
Error *err = NULL;
|
|
|
|
virtio_bus_device_unplugged(vdev);
|
|
|
|
if (vdc->unrealize != NULL) {
|
|
vdc->unrealize(dev, &err);
|
|
if (err != NULL) {
|
|
error_propagate(errp, err);
|
|
return;
|
|
}
|
|
}
|
|
|
|
g_free(vdev->bus_name);
|
|
vdev->bus_name = NULL;
|
|
}
|
|
|
|
static void virtio_device_free_virtqueues(VirtIODevice *vdev)
|
|
{
|
|
int i;
|
|
if (!vdev->vq) {
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
|
|
if (vdev->vq[i].vring.num == 0) {
|
|
break;
|
|
}
|
|
virtio_virtqueue_reset_region_cache(&vdev->vq[i]);
|
|
}
|
|
g_free(vdev->vq);
|
|
}
|
|
|
|
static void virtio_device_instance_finalize(Object *obj)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(obj);
|
|
|
|
memory_listener_unregister(&vdev->listener);
|
|
virtio_device_free_virtqueues(vdev);
|
|
|
|
g_free(vdev->config);
|
|
g_free(vdev->vector_queues);
|
|
}
|
|
|
|
static Property virtio_properties[] = {
|
|
DEFINE_VIRTIO_COMMON_FEATURES(VirtIODevice, host_features),
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
};
|
|
|
|
static int virtio_device_start_ioeventfd_impl(VirtIODevice *vdev)
|
|
{
|
|
VirtioBusState *qbus = VIRTIO_BUS(qdev_get_parent_bus(DEVICE(vdev)));
|
|
int i, n, r, err;
|
|
|
|
memory_region_transaction_begin();
|
|
for (n = 0; n < VIRTIO_QUEUE_MAX; n++) {
|
|
VirtQueue *vq = &vdev->vq[n];
|
|
if (!virtio_queue_get_num(vdev, n)) {
|
|
continue;
|
|
}
|
|
r = virtio_bus_set_host_notifier(qbus, n, true);
|
|
if (r < 0) {
|
|
err = r;
|
|
goto assign_error;
|
|
}
|
|
event_notifier_set_handler(&vq->host_notifier,
|
|
virtio_queue_host_notifier_read);
|
|
}
|
|
|
|
for (n = 0; n < VIRTIO_QUEUE_MAX; n++) {
|
|
/* Kick right away to begin processing requests already in vring */
|
|
VirtQueue *vq = &vdev->vq[n];
|
|
if (!vq->vring.num) {
|
|
continue;
|
|
}
|
|
event_notifier_set(&vq->host_notifier);
|
|
}
|
|
memory_region_transaction_commit();
|
|
return 0;
|
|
|
|
assign_error:
|
|
i = n; /* save n for a second iteration after transaction is committed. */
|
|
while (--n >= 0) {
|
|
VirtQueue *vq = &vdev->vq[n];
|
|
if (!virtio_queue_get_num(vdev, n)) {
|
|
continue;
|
|
}
|
|
|
|
event_notifier_set_handler(&vq->host_notifier, NULL);
|
|
r = virtio_bus_set_host_notifier(qbus, n, false);
|
|
assert(r >= 0);
|
|
}
|
|
memory_region_transaction_commit();
|
|
|
|
while (--i >= 0) {
|
|
if (!virtio_queue_get_num(vdev, i)) {
|
|
continue;
|
|
}
|
|
virtio_bus_cleanup_host_notifier(qbus, i);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
int virtio_device_start_ioeventfd(VirtIODevice *vdev)
|
|
{
|
|
BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
|
|
VirtioBusState *vbus = VIRTIO_BUS(qbus);
|
|
|
|
return virtio_bus_start_ioeventfd(vbus);
|
|
}
|
|
|
|
static void virtio_device_stop_ioeventfd_impl(VirtIODevice *vdev)
|
|
{
|
|
VirtioBusState *qbus = VIRTIO_BUS(qdev_get_parent_bus(DEVICE(vdev)));
|
|
int n, r;
|
|
|
|
memory_region_transaction_begin();
|
|
for (n = 0; n < VIRTIO_QUEUE_MAX; n++) {
|
|
VirtQueue *vq = &vdev->vq[n];
|
|
|
|
if (!virtio_queue_get_num(vdev, n)) {
|
|
continue;
|
|
}
|
|
event_notifier_set_handler(&vq->host_notifier, NULL);
|
|
r = virtio_bus_set_host_notifier(qbus, n, false);
|
|
assert(r >= 0);
|
|
}
|
|
memory_region_transaction_commit();
|
|
|
|
for (n = 0; n < VIRTIO_QUEUE_MAX; n++) {
|
|
if (!virtio_queue_get_num(vdev, n)) {
|
|
continue;
|
|
}
|
|
virtio_bus_cleanup_host_notifier(qbus, n);
|
|
}
|
|
}
|
|
|
|
void virtio_device_stop_ioeventfd(VirtIODevice *vdev)
|
|
{
|
|
BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
|
|
VirtioBusState *vbus = VIRTIO_BUS(qbus);
|
|
|
|
virtio_bus_stop_ioeventfd(vbus);
|
|
}
|
|
|
|
int virtio_device_grab_ioeventfd(VirtIODevice *vdev)
|
|
{
|
|
BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
|
|
VirtioBusState *vbus = VIRTIO_BUS(qbus);
|
|
|
|
return virtio_bus_grab_ioeventfd(vbus);
|
|
}
|
|
|
|
void virtio_device_release_ioeventfd(VirtIODevice *vdev)
|
|
{
|
|
BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
|
|
VirtioBusState *vbus = VIRTIO_BUS(qbus);
|
|
|
|
virtio_bus_release_ioeventfd(vbus);
|
|
}
|
|
|
|
static void virtio_device_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
/* Set the default value here. */
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
|
|
dc->realize = virtio_device_realize;
|
|
dc->unrealize = virtio_device_unrealize;
|
|
dc->bus_type = TYPE_VIRTIO_BUS;
|
|
dc->props = virtio_properties;
|
|
vdc->start_ioeventfd = virtio_device_start_ioeventfd_impl;
|
|
vdc->stop_ioeventfd = virtio_device_stop_ioeventfd_impl;
|
|
|
|
vdc->legacy_features |= VIRTIO_LEGACY_FEATURES;
|
|
}
|
|
|
|
bool virtio_device_ioeventfd_enabled(VirtIODevice *vdev)
|
|
{
|
|
BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
|
|
VirtioBusState *vbus = VIRTIO_BUS(qbus);
|
|
|
|
return virtio_bus_ioeventfd_enabled(vbus);
|
|
}
|
|
|
|
static const TypeInfo virtio_device_info = {
|
|
.name = TYPE_VIRTIO_DEVICE,
|
|
.parent = TYPE_DEVICE,
|
|
.instance_size = sizeof(VirtIODevice),
|
|
.class_init = virtio_device_class_init,
|
|
.instance_finalize = virtio_device_instance_finalize,
|
|
.abstract = true,
|
|
.class_size = sizeof(VirtioDeviceClass),
|
|
};
|
|
|
|
static void virtio_register_types(void)
|
|
{
|
|
type_register_static(&virtio_device_info);
|
|
}
|
|
|
|
type_init(virtio_register_types)
|