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qemu-patch-raspberry4/hw/virtio.c
aliguori f46f15bca7 Remove TARGET_PAGE_SIZE from virtio interface (Hollis Blanchard) 
TARGET_PAGE_SIZE should only be used internal to qemu, not in guest/host
interfaces. The virtio frontend code in Linux uses two constants (PFN shift
and vring alignment) for the interface, so update qemu to match.

I've tested this with PowerPC KVM and confirmed that it fixes virtio problems
when using non-TARGET_PAGE_SIZE pages in the guest.

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5871 c046a42c-6fe2-441c-8c8c-71466251a162
2008-12-04 19:58:45 +00:00

858 lines
23 KiB
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/*
* Virtio Support
*
* Copyright IBM, Corp. 2007
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#include <inttypes.h>
#include <err.h>
#include "virtio.h"
#include "sysemu.h"
//#define VIRTIO_ZERO_COPY
/* from Linux's linux/virtio_pci.h */
/* A 32-bit r/o bitmask of the features supported by the host */
#define VIRTIO_PCI_HOST_FEATURES 0
/* A 32-bit r/w bitmask of features activated by the guest */
#define VIRTIO_PCI_GUEST_FEATURES 4
/* A 32-bit r/w PFN for the currently selected queue */
#define VIRTIO_PCI_QUEUE_PFN 8
/* A 16-bit r/o queue size for the currently selected queue */
#define VIRTIO_PCI_QUEUE_NUM 12
/* A 16-bit r/w queue selector */
#define VIRTIO_PCI_QUEUE_SEL 14
/* A 16-bit r/w queue notifier */
#define VIRTIO_PCI_QUEUE_NOTIFY 16
/* An 8-bit device status register. */
#define VIRTIO_PCI_STATUS 18
/* An 8-bit r/o interrupt status register. Reading the value will return the
* current contents of the ISR and will also clear it. This is effectively
* a read-and-acknowledge. */
#define VIRTIO_PCI_ISR 19
#define VIRTIO_PCI_CONFIG 20
/* Virtio ABI version, if we increment this, we break the guest driver. */
#define VIRTIO_PCI_ABI_VERSION 0
/* How many bits to shift physical queue address written to QUEUE_PFN.
* 12 is historical, and due to x86 page size. */
#define VIRTIO_PCI_QUEUE_ADDR_SHIFT 12
/* The alignment to use between consumer and producer parts of vring.
* x86 pagesize again. */
#define VIRTIO_PCI_VRING_ALIGN 4096
/* QEMU doesn't strictly need write barriers since everything runs in
* lock-step. We'll leave the calls to wmb() in though to make it obvious for
* KVM or if kqemu gets SMP support.
*/
#define wmb() do { } while (0)
typedef struct VRingDesc
{
uint64_t addr;
uint32_t len;
uint16_t flags;
uint16_t next;
} VRingDesc;
typedef struct VRingAvail
{
uint16_t flags;
uint16_t idx;
uint16_t ring[0];
} VRingAvail;
typedef struct VRingUsedElem
{
uint32_t id;
uint32_t len;
} VRingUsedElem;
typedef struct VRingUsed
{
uint16_t flags;
uint16_t idx;
VRingUsedElem ring[0];
} VRingUsed;
typedef struct VRing
{
unsigned int num;
target_phys_addr_t desc;
target_phys_addr_t avail;
target_phys_addr_t used;
} VRing;
struct VirtQueue
{
VRing vring;
uint32_t pfn;
uint16_t last_avail_idx;
int inuse;
void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq);
};
#define VIRTIO_PCI_QUEUE_MAX 16
/* virt queue functions */
#ifdef VIRTIO_ZERO_COPY
static void *virtio_map_gpa(target_phys_addr_t addr, size_t size)
{
ram_addr_t off;
target_phys_addr_t addr1;
off = cpu_get_physical_page_desc(addr);
if ((off & ~TARGET_PAGE_MASK) != IO_MEM_RAM) {
fprintf(stderr, "virtio DMA to IO ram\n");
exit(1);
}
off = (off & TARGET_PAGE_MASK) | (addr & ~TARGET_PAGE_MASK);
for (addr1 = addr + TARGET_PAGE_SIZE;
addr1 < TARGET_PAGE_ALIGN(addr + size);
addr1 += TARGET_PAGE_SIZE) {
ram_addr_t off1;
off1 = cpu_get_physical_page_desc(addr1);
if ((off1 & ~TARGET_PAGE_MASK) != IO_MEM_RAM) {
fprintf(stderr, "virtio DMA to IO ram\n");
exit(1);
}
off1 = (off1 & TARGET_PAGE_MASK) | (addr1 & ~TARGET_PAGE_MASK);
if (off1 != (off + (addr1 - addr))) {
fprintf(stderr, "discontigous virtio memory\n");
exit(1);
}
}
return phys_ram_base + off;
}
#endif
static void virtqueue_init(VirtQueue *vq, target_phys_addr_t pa)
{
vq->vring.desc = pa;
vq->vring.avail = pa + vq->vring.num * sizeof(VRingDesc);
vq->vring.used = vring_align(vq->vring.avail +
offsetof(VRingAvail, ring[vq->vring.num]),
VIRTIO_PCI_VRING_ALIGN);
}
static inline uint64_t vring_desc_addr(VirtQueue *vq, int i)
{
target_phys_addr_t pa;
pa = vq->vring.desc + sizeof(VRingDesc) * i + offsetof(VRingDesc, addr);
return ldq_phys(pa);
}
static inline uint32_t vring_desc_len(VirtQueue *vq, int i)
{
target_phys_addr_t pa;
pa = vq->vring.desc + sizeof(VRingDesc) * i + offsetof(VRingDesc, len);
return ldl_phys(pa);
}
static inline uint16_t vring_desc_flags(VirtQueue *vq, int i)
{
target_phys_addr_t pa;
pa = vq->vring.desc + sizeof(VRingDesc) * i + offsetof(VRingDesc, flags);
return lduw_phys(pa);
}
static inline uint16_t vring_desc_next(VirtQueue *vq, int i)
{
target_phys_addr_t pa;
pa = vq->vring.desc + sizeof(VRingDesc) * i + offsetof(VRingDesc, next);
return lduw_phys(pa);
}
static inline uint16_t vring_avail_flags(VirtQueue *vq)
{
target_phys_addr_t pa;
pa = vq->vring.avail + offsetof(VRingAvail, flags);
return lduw_phys(pa);
}
static inline uint16_t vring_avail_idx(VirtQueue *vq)
{
target_phys_addr_t pa;
pa = vq->vring.avail + offsetof(VRingAvail, idx);
return lduw_phys(pa);
}
static inline uint16_t vring_avail_ring(VirtQueue *vq, int i)
{
target_phys_addr_t pa;
pa = vq->vring.avail + offsetof(VRingAvail, ring[i]);
return lduw_phys(pa);
}
static inline void vring_used_ring_id(VirtQueue *vq, int i, uint32_t val)
{
target_phys_addr_t pa;
pa = vq->vring.used + offsetof(VRingUsed, ring[i].id);
stl_phys(pa, val);
}
static inline void vring_used_ring_len(VirtQueue *vq, int i, uint32_t val)
{
target_phys_addr_t pa;
pa = vq->vring.used + offsetof(VRingUsed, ring[i].len);
stl_phys(pa, val);
}
static uint16_t vring_used_idx(VirtQueue *vq)
{
target_phys_addr_t pa;
pa = vq->vring.used + offsetof(VRingUsed, idx);
return lduw_phys(pa);
}
static inline void vring_used_idx_increment(VirtQueue *vq, uint16_t val)
{
target_phys_addr_t pa;
pa = vq->vring.used + offsetof(VRingUsed, idx);
stw_phys(pa, vring_used_idx(vq) + val);
}
static inline void vring_used_flags_set_bit(VirtQueue *vq, int mask)
{
target_phys_addr_t pa;
pa = vq->vring.used + offsetof(VRingUsed, flags);
stw_phys(pa, lduw_phys(pa) | mask);
}
static inline void vring_used_flags_unset_bit(VirtQueue *vq, int mask)
{
target_phys_addr_t pa;
pa = vq->vring.used + offsetof(VRingUsed, flags);
stw_phys(pa, lduw_phys(pa) & ~mask);
}
void virtio_queue_set_notification(VirtQueue *vq, int enable)
{
if (enable)
vring_used_flags_unset_bit(vq, VRING_USED_F_NO_NOTIFY);
else
vring_used_flags_set_bit(vq, VRING_USED_F_NO_NOTIFY);
}
int virtio_queue_ready(VirtQueue *vq)
{
return vq->vring.avail != 0;
}
int virtio_queue_empty(VirtQueue *vq)
{
return vring_avail_idx(vq) == vq->last_avail_idx;
}
void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
unsigned int len, unsigned int idx)
{
unsigned int offset;
int i;
#ifndef VIRTIO_ZERO_COPY
for (i = 0; i < elem->out_num; i++)
qemu_free(elem->out_sg[i].iov_base);
#endif
offset = 0;
for (i = 0; i < elem->in_num; i++) {
size_t size = MIN(len - offset, elem->in_sg[i].iov_len);
#ifdef VIRTIO_ZERO_COPY
if (size) {
ram_addr_t addr = (uint8_t *)elem->in_sg[i].iov_base - phys_ram_base;
ram_addr_t off;
for (off = 0; off < size; off += TARGET_PAGE_SIZE)
cpu_physical_memory_set_dirty(addr + off);
}
#else
if (size)
cpu_physical_memory_write(elem->in_addr[i],
elem->in_sg[i].iov_base,
size);
qemu_free(elem->in_sg[i].iov_base);
#endif
offset += size;
}
idx = (idx + vring_used_idx(vq)) % vq->vring.num;
/* Get a pointer to the next entry in the used ring. */
vring_used_ring_id(vq, idx, elem->index);
vring_used_ring_len(vq, idx, len);
}
void virtqueue_flush(VirtQueue *vq, unsigned int count)
{
/* Make sure buffer is written before we update index. */
wmb();
vring_used_idx_increment(vq, count);
vq->inuse -= count;
}
void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
unsigned int len)
{
virtqueue_fill(vq, elem, len, 0);
virtqueue_flush(vq, 1);
}
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)
errx(1, "Guest moved used index from %u to %u",
idx, vring_avail_idx(vq));
return num_heads;
}
static unsigned int 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)
errx(1, "Guest says index %u is available", head);
return head;
}
static unsigned virtqueue_next_desc(VirtQueue *vq, unsigned int i)
{
unsigned int next;
/* If this descriptor says it doesn't chain, we're done. */
if (!(vring_desc_flags(vq, i) & VRING_DESC_F_NEXT))
return vq->vring.num;
/* Check they're not leading us off end of descriptors. */
next = vring_desc_next(vq, i);
/* Make sure compiler knows to grab that: we don't want it changing! */
wmb();
if (next >= vq->vring.num)
errx(1, "Desc next is %u", next);
return next;
}
int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes)
{
unsigned int idx;
int num_bufs, in_total, out_total;
idx = vq->last_avail_idx;
num_bufs = in_total = out_total = 0;
while (virtqueue_num_heads(vq, idx)) {
int i;
i = virtqueue_get_head(vq, idx++);
do {
/* If we've got too many, that implies a descriptor loop. */
if (++num_bufs > vq->vring.num)
errx(1, "Looped descriptor");
if (vring_desc_flags(vq, i) & VRING_DESC_F_WRITE) {
if (in_bytes > 0 &&
(in_total += vring_desc_len(vq, i)) >= in_bytes)
return 1;
} else {
if (out_bytes > 0 &&
(out_total += vring_desc_len(vq, i)) >= out_bytes)
return 1;
}
} while ((i = virtqueue_next_desc(vq, i)) != vq->vring.num);
}
return 0;
}
int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem)
{
unsigned int i, head;
if (!virtqueue_num_heads(vq, vq->last_avail_idx))
return 0;
/* When we start there are none of either input nor output. */
elem->out_num = elem->in_num = 0;
i = head = virtqueue_get_head(vq, vq->last_avail_idx++);
do {
struct iovec *sg;
if (vring_desc_flags(vq, i) & VRING_DESC_F_WRITE) {
elem->in_addr[elem->in_num] = vring_desc_addr(vq, i);
sg = &elem->in_sg[elem->in_num++];
} else
sg = &elem->out_sg[elem->out_num++];
/* Grab the first descriptor, and check it's OK. */
sg->iov_len = vring_desc_len(vq, i);
#ifdef VIRTIO_ZERO_COPY
sg->iov_base = virtio_map_gpa(vring_desc_addr(vq, i), sg->iov_len);
#else
/* cap individual scatter element size to prevent unbounded allocations
of memory from the guest. Practically speaking, no virtio driver
will ever pass more than a page in each element. We set the cap to
be 2MB in case for some reason a large page makes it way into the
sg list. When we implement a zero copy API, this limitation will
disappear */
if (sg->iov_len > (2 << 20))
sg->iov_len = 2 << 20;
sg->iov_base = qemu_malloc(sg->iov_len);
if (sg->iov_base &&
!(vring_desc_flags(vq, i) & VRING_DESC_F_WRITE)) {
cpu_physical_memory_read(vring_desc_addr(vq, i),
sg->iov_base,
sg->iov_len);
}
#endif
if (sg->iov_base == NULL)
errx(1, "Invalid mapping\n");
/* If we've got too many, that implies a descriptor loop. */
if ((elem->in_num + elem->out_num) > vq->vring.num)
errx(1, "Looped descriptor");
} while ((i = virtqueue_next_desc(vq, i)) != vq->vring.num);
elem->index = head;
vq->inuse++;
return elem->in_num + elem->out_num;
}
/* virtio device */
static VirtIODevice *to_virtio_device(PCIDevice *pci_dev)
{
return (VirtIODevice *)pci_dev;
}
static void virtio_update_irq(VirtIODevice *vdev)
{
qemu_set_irq(vdev->pci_dev.irq[0], vdev->isr & 1);
}
void virtio_reset(void *opaque)
{
VirtIODevice *vdev = opaque;
int i;
if (vdev->reset)
vdev->reset(vdev);
vdev->features = 0;
vdev->queue_sel = 0;
vdev->status = 0;
vdev->isr = 0;
virtio_update_irq(vdev);
for(i = 0; i < VIRTIO_PCI_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].pfn = 0;
}
}
static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
{
VirtIODevice *vdev = to_virtio_device(opaque);
ram_addr_t pa;
addr -= vdev->addr;
switch (addr) {
case VIRTIO_PCI_GUEST_FEATURES:
if (vdev->set_features)
vdev->set_features(vdev, val);
vdev->features = val;
break;
case VIRTIO_PCI_QUEUE_PFN:
pa = (ram_addr_t)val << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
vdev->vq[vdev->queue_sel].pfn = val;
if (pa == 0) {
virtio_reset(vdev);
} else {
virtqueue_init(&vdev->vq[vdev->queue_sel], pa);
}
break;
case VIRTIO_PCI_QUEUE_SEL:
if (val < VIRTIO_PCI_QUEUE_MAX)
vdev->queue_sel = val;
break;
case VIRTIO_PCI_QUEUE_NOTIFY:
if (val < VIRTIO_PCI_QUEUE_MAX && vdev->vq[val].vring.desc)
vdev->vq[val].handle_output(vdev, &vdev->vq[val]);
break;
case VIRTIO_PCI_STATUS:
vdev->status = val & 0xFF;
if (vdev->status == 0)
virtio_reset(vdev);
break;
}
}
static uint32_t virtio_ioport_read(void *opaque, uint32_t addr)
{
VirtIODevice *vdev = to_virtio_device(opaque);
uint32_t ret = 0xFFFFFFFF;
addr -= vdev->addr;
switch (addr) {
case VIRTIO_PCI_HOST_FEATURES:
ret = vdev->get_features(vdev);
ret |= (1 << VIRTIO_F_NOTIFY_ON_EMPTY);
break;
case VIRTIO_PCI_GUEST_FEATURES:
ret = vdev->features;
break;
case VIRTIO_PCI_QUEUE_PFN:
ret = vdev->vq[vdev->queue_sel].pfn;
break;
case VIRTIO_PCI_QUEUE_NUM:
ret = vdev->vq[vdev->queue_sel].vring.num;
break;
case VIRTIO_PCI_QUEUE_SEL:
ret = vdev->queue_sel;
break;
case VIRTIO_PCI_STATUS:
ret = vdev->status;
break;
case VIRTIO_PCI_ISR:
/* reading from the ISR also clears it. */
ret = vdev->isr;
vdev->isr = 0;
virtio_update_irq(vdev);
break;
default:
break;
}
return ret;
}
static uint32_t virtio_config_readb(void *opaque, uint32_t addr)
{
VirtIODevice *vdev = opaque;
uint8_t val;
vdev->get_config(vdev, vdev->config);
addr -= vdev->addr + VIRTIO_PCI_CONFIG;
if (addr > (vdev->config_len - sizeof(val)))
return (uint32_t)-1;
memcpy(&val, vdev->config + addr, sizeof(val));
return val;
}
static uint32_t virtio_config_readw(void *opaque, uint32_t addr)
{
VirtIODevice *vdev = opaque;
uint16_t val;
vdev->get_config(vdev, vdev->config);
addr -= vdev->addr + VIRTIO_PCI_CONFIG;
if (addr > (vdev->config_len - sizeof(val)))
return (uint32_t)-1;
memcpy(&val, vdev->config + addr, sizeof(val));
return val;
}
static uint32_t virtio_config_readl(void *opaque, uint32_t addr)
{
VirtIODevice *vdev = opaque;
uint32_t val;
vdev->get_config(vdev, vdev->config);
addr -= vdev->addr + VIRTIO_PCI_CONFIG;
if (addr > (vdev->config_len - sizeof(val)))
return (uint32_t)-1;
memcpy(&val, vdev->config + addr, sizeof(val));
return val;
}
static void virtio_config_writeb(void *opaque, uint32_t addr, uint32_t data)
{
VirtIODevice *vdev = opaque;
uint8_t val = data;
addr -= vdev->addr + VIRTIO_PCI_CONFIG;
if (addr > (vdev->config_len - sizeof(val)))
return;
memcpy(vdev->config + addr, &val, sizeof(val));
if (vdev->set_config)
vdev->set_config(vdev, vdev->config);
}
static void virtio_config_writew(void *opaque, uint32_t addr, uint32_t data)
{
VirtIODevice *vdev = opaque;
uint16_t val = data;
addr -= vdev->addr + VIRTIO_PCI_CONFIG;
if (addr > (vdev->config_len - sizeof(val)))
return;
memcpy(vdev->config + addr, &val, sizeof(val));
if (vdev->set_config)
vdev->set_config(vdev, vdev->config);
}
static void virtio_config_writel(void *opaque, uint32_t addr, uint32_t data)
{
VirtIODevice *vdev = opaque;
uint32_t val = data;
addr -= vdev->addr + VIRTIO_PCI_CONFIG;
if (addr > (vdev->config_len - sizeof(val)))
return;
memcpy(vdev->config + addr, &val, sizeof(val));
if (vdev->set_config)
vdev->set_config(vdev, vdev->config);
}
static void virtio_map(PCIDevice *pci_dev, int region_num,
uint32_t addr, uint32_t size, int type)
{
VirtIODevice *vdev = to_virtio_device(pci_dev);
int i;
vdev->addr = addr;
for (i = 0; i < 3; i++) {
register_ioport_write(addr, 20, 1 << i, virtio_ioport_write, vdev);
register_ioport_read(addr, 20, 1 << i, virtio_ioport_read, vdev);
}
if (vdev->config_len) {
register_ioport_write(addr + 20, vdev->config_len, 1,
virtio_config_writeb, vdev);
register_ioport_write(addr + 20, vdev->config_len, 2,
virtio_config_writew, vdev);
register_ioport_write(addr + 20, vdev->config_len, 4,
virtio_config_writel, vdev);
register_ioport_read(addr + 20, vdev->config_len, 1,
virtio_config_readb, vdev);
register_ioport_read(addr + 20, vdev->config_len, 2,
virtio_config_readw, vdev);
register_ioport_read(addr + 20, vdev->config_len, 4,
virtio_config_readl, vdev);
vdev->get_config(vdev, vdev->config);
}
}
VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
void (*handle_output)(VirtIODevice *, VirtQueue *))
{
int i;
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
if (vdev->vq[i].vring.num == 0)
break;
}
if (i == VIRTIO_PCI_QUEUE_MAX || queue_size > VIRTQUEUE_MAX_SIZE)
abort();
vdev->vq[i].vring.num = queue_size;
vdev->vq[i].handle_output = handle_output;
return &vdev->vq[i];
}
void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
{
/* Always notify when queue is empty */
if ((vq->inuse || vring_avail_idx(vq) != vq->last_avail_idx) &&
(vring_avail_flags(vq) & VRING_AVAIL_F_NO_INTERRUPT))
return;
vdev->isr |= 0x01;
virtio_update_irq(vdev);
}
void virtio_notify_config(VirtIODevice *vdev)
{
vdev->isr |= 0x03;
virtio_update_irq(vdev);
}
void virtio_save(VirtIODevice *vdev, QEMUFile *f)
{
int i;
pci_device_save(&vdev->pci_dev, f);
qemu_put_be32s(f, &vdev->addr);
qemu_put_8s(f, &vdev->status);
qemu_put_8s(f, &vdev->isr);
qemu_put_be16s(f, &vdev->queue_sel);
qemu_put_be32s(f, &vdev->features);
qemu_put_be32(f, vdev->config_len);
qemu_put_buffer(f, vdev->config, vdev->config_len);
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
if (vdev->vq[i].vring.num == 0)
break;
}
qemu_put_be32(f, i);
for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
if (vdev->vq[i].vring.num == 0)
break;
qemu_put_be32(f, vdev->vq[i].vring.num);
qemu_put_be32s(f, &vdev->vq[i].pfn);
qemu_put_be16s(f, &vdev->vq[i].last_avail_idx);
}
}
void virtio_load(VirtIODevice *vdev, QEMUFile *f)
{
int num, i;
pci_device_load(&vdev->pci_dev, f);
qemu_get_be32s(f, &vdev->addr);
qemu_get_8s(f, &vdev->status);
qemu_get_8s(f, &vdev->isr);
qemu_get_be16s(f, &vdev->queue_sel);
qemu_get_be32s(f, &vdev->features);
vdev->config_len = qemu_get_be32(f);
qemu_get_buffer(f, vdev->config, vdev->config_len);
num = qemu_get_be32(f);
for (i = 0; i < num; i++) {
vdev->vq[i].vring.num = qemu_get_be32(f);
qemu_get_be32s(f, &vdev->vq[i].pfn);
qemu_get_be16s(f, &vdev->vq[i].last_avail_idx);
if (vdev->vq[i].pfn) {
target_phys_addr_t pa;
pa = (ram_addr_t)vdev->vq[i].pfn << VIRTIO_PCI_QUEUE_ADDR_SHIFT;
virtqueue_init(&vdev->vq[i], pa);
}
}
virtio_update_irq(vdev);
}
VirtIODevice *virtio_init_pci(PCIBus *bus, const char *name,
uint16_t vendor, uint16_t device,
uint16_t subvendor, uint16_t subdevice,
uint8_t class_code, uint8_t subclass_code,
uint8_t pif, size_t config_size,
size_t struct_size)
{
VirtIODevice *vdev;
PCIDevice *pci_dev;
uint8_t *config;
uint32_t size;
pci_dev = pci_register_device(bus, name, struct_size,
-1, NULL, NULL);
if (!pci_dev)
return NULL;
vdev = to_virtio_device(pci_dev);
vdev->status = 0;
vdev->isr = 0;
vdev->queue_sel = 0;
vdev->vq = qemu_mallocz(sizeof(VirtQueue) * VIRTIO_PCI_QUEUE_MAX);
config = pci_dev->config;
config[0x00] = vendor & 0xFF;
config[0x01] = (vendor >> 8) & 0xFF;
config[0x02] = device & 0xFF;
config[0x03] = (device >> 8) & 0xFF;
config[0x08] = VIRTIO_PCI_ABI_VERSION;
config[0x09] = pif;
config[0x0a] = subclass_code;
config[0x0b] = class_code;
config[0x0e] = 0x00;
config[0x2c] = subvendor & 0xFF;
config[0x2d] = (subvendor >> 8) & 0xFF;
config[0x2e] = subdevice & 0xFF;
config[0x2f] = (subdevice >> 8) & 0xFF;
config[0x3d] = 1;
vdev->name = name;
vdev->config_len = config_size;
if (vdev->config_len)
vdev->config = qemu_mallocz(config_size);
else
vdev->config = NULL;
size = 20 + config_size;
if (size & (size-1))
size = 1 << fls(size);
pci_register_io_region(pci_dev, 0, size, PCI_ADDRESS_SPACE_IO,
virtio_map);
qemu_register_reset(virtio_reset, vdev);
return vdev;
}
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