Modify the pre_save method on VMStateDescription to return an int rather than void so that it potentially can fail. Changed zillions of devices to make them return 0; the only case I've made it return non-0 is hw/intc/s390_flic_kvm.c that already had an error_report/return case. Note: If you add an error exit in your pre_save you must emit an error_report to say why. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Message-Id: <20170925112917.21340-2-dgilbert@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
633 lines
17 KiB
C
633 lines
17 KiB
C
/*
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* QEMU S390x KVM floating interrupt controller (flic)
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*
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* Copyright 2014 IBM Corp.
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* Author(s): Jens Freimann <jfrei@linux.vnet.ibm.com>
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* Cornelia Huck <cornelia.huck@de.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or (at
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* your option) any later version. See the COPYING file in the top-level
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* directory.
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*/
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#include "qemu/osdep.h"
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#include "qemu-common.h"
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#include "cpu.h"
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#include "kvm_s390x.h"
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#include <sys/ioctl.h>
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#include "qemu/error-report.h"
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#include "qapi/error.h"
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#include "hw/sysbus.h"
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#include "sysemu/kvm.h"
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#include "hw/s390x/s390_flic.h"
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#include "hw/s390x/adapter.h"
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#include "hw/s390x/css.h"
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#include "trace.h"
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#define FLIC_SAVE_INITIAL_SIZE getpagesize()
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#define FLIC_FAILED (-1UL)
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#define FLIC_SAVEVM_VERSION 1
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typedef struct KVMS390FLICState {
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S390FLICState parent_obj;
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uint32_t fd;
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bool clear_io_supported;
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} KVMS390FLICState;
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DeviceState *s390_flic_kvm_create(void)
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{
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DeviceState *dev = NULL;
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if (kvm_enabled()) {
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dev = qdev_create(NULL, TYPE_KVM_S390_FLIC);
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object_property_add_child(qdev_get_machine(), TYPE_KVM_S390_FLIC,
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OBJECT(dev), NULL);
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}
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return dev;
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}
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/**
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* flic_get_all_irqs - store all pending irqs in buffer
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* @buf: pointer to buffer which is passed to kernel
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* @len: length of buffer
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* @flic: pointer to flic device state
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*
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* Returns: -ENOMEM if buffer is too small,
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* -EINVAL if attr.group is invalid,
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* -EFAULT if copying to userspace failed,
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* on success return number of stored interrupts
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*/
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static int flic_get_all_irqs(KVMS390FLICState *flic,
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void *buf, int len)
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{
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struct kvm_device_attr attr = {
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.group = KVM_DEV_FLIC_GET_ALL_IRQS,
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.addr = (uint64_t) buf,
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.attr = len,
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};
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int rc;
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rc = ioctl(flic->fd, KVM_GET_DEVICE_ATTR, &attr);
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return rc == -1 ? -errno : rc;
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}
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static void flic_enable_pfault(KVMS390FLICState *flic)
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{
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struct kvm_device_attr attr = {
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.group = KVM_DEV_FLIC_APF_ENABLE,
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};
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int rc;
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rc = ioctl(flic->fd, KVM_SET_DEVICE_ATTR, &attr);
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if (rc) {
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fprintf(stderr, "flic: couldn't enable pfault\n");
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}
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}
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static void flic_disable_wait_pfault(KVMS390FLICState *flic)
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{
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struct kvm_device_attr attr = {
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.group = KVM_DEV_FLIC_APF_DISABLE_WAIT,
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};
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int rc;
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rc = ioctl(flic->fd, KVM_SET_DEVICE_ATTR, &attr);
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if (rc) {
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fprintf(stderr, "flic: couldn't disable pfault\n");
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}
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}
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/** flic_enqueue_irqs - returns 0 on success
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* @buf: pointer to buffer which is passed to kernel
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* @len: length of buffer
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* @flic: pointer to flic device state
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*
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* Returns: -EINVAL if attr.group is unknown
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*/
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static int flic_enqueue_irqs(void *buf, uint64_t len,
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KVMS390FLICState *flic)
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{
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int rc;
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struct kvm_device_attr attr = {
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.group = KVM_DEV_FLIC_ENQUEUE,
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.addr = (uint64_t) buf,
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.attr = len,
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};
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rc = ioctl(flic->fd, KVM_SET_DEVICE_ATTR, &attr);
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return rc ? -errno : 0;
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}
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int kvm_s390_inject_flic(struct kvm_s390_irq *irq)
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{
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static KVMS390FLICState *flic;
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if (unlikely(!flic)) {
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flic = KVM_S390_FLIC(s390_get_flic());
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}
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return flic_enqueue_irqs(irq, sizeof(*irq), flic);
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}
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static int kvm_s390_clear_io_flic(S390FLICState *fs, uint16_t subchannel_id,
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uint16_t subchannel_nr)
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{
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KVMS390FLICState *flic = KVM_S390_FLIC(fs);
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int rc;
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uint32_t sid = subchannel_id << 16 | subchannel_nr;
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struct kvm_device_attr attr = {
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.group = KVM_DEV_FLIC_CLEAR_IO_IRQ,
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.addr = (uint64_t) &sid,
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.attr = sizeof(sid),
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};
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if (unlikely(!flic->clear_io_supported)) {
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return -ENOSYS;
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}
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rc = ioctl(flic->fd, KVM_SET_DEVICE_ATTR, &attr);
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return rc ? -errno : 0;
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}
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static int kvm_s390_modify_ais_mode(S390FLICState *fs, uint8_t isc,
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uint16_t mode)
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{
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KVMS390FLICState *flic = KVM_S390_FLIC(fs);
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struct kvm_s390_ais_req req = {
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.isc = isc,
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.mode = mode,
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};
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struct kvm_device_attr attr = {
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.group = KVM_DEV_FLIC_AISM,
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.addr = (uint64_t)&req,
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};
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if (!fs->ais_supported) {
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return -ENOSYS;
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}
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return ioctl(flic->fd, KVM_SET_DEVICE_ATTR, &attr) ? -errno : 0;
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}
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static int kvm_s390_inject_airq(S390FLICState *fs, uint8_t type,
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uint8_t isc, uint8_t flags)
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{
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KVMS390FLICState *flic = KVM_S390_FLIC(fs);
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uint32_t id = css_get_adapter_id(type, isc);
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struct kvm_device_attr attr = {
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.group = KVM_DEV_FLIC_AIRQ_INJECT,
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.attr = id,
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};
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if (!fs->ais_supported) {
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return -ENOSYS;
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}
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return ioctl(flic->fd, KVM_SET_DEVICE_ATTR, &attr) ? -errno : 0;
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}
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/**
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* __get_all_irqs - store all pending irqs in buffer
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* @flic: pointer to flic device state
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* @buf: pointer to pointer to a buffer
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* @len: length of buffer
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*
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* Returns: return value of flic_get_all_irqs
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* Note: Retry and increase buffer size until flic_get_all_irqs
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* either returns a value >= 0 or a negative error code.
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* -ENOMEM is an exception, which means the buffer is too small
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* and we should try again. Other negative error codes can be
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* -EFAULT and -EINVAL which we ignore at this point
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*/
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static int __get_all_irqs(KVMS390FLICState *flic,
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void **buf, int len)
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{
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int r;
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do {
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/* returns -ENOMEM if buffer is too small and number
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* of queued interrupts on success */
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r = flic_get_all_irqs(flic, *buf, len);
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if (r >= 0) {
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break;
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}
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len *= 2;
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*buf = g_try_realloc(*buf, len);
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if (!buf) {
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return -ENOMEM;
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}
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} while (r == -ENOMEM && len <= KVM_S390_FLIC_MAX_BUFFER);
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return r;
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}
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static int kvm_s390_register_io_adapter(S390FLICState *fs, uint32_t id,
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uint8_t isc, bool swap,
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bool is_maskable, uint8_t flags)
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{
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struct kvm_s390_io_adapter adapter = {
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.id = id,
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.isc = isc,
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.maskable = is_maskable,
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.swap = swap,
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.flags = flags,
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};
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KVMS390FLICState *flic = KVM_S390_FLIC(fs);
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int r;
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struct kvm_device_attr attr = {
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.group = KVM_DEV_FLIC_ADAPTER_REGISTER,
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.addr = (uint64_t)&adapter,
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};
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if (!kvm_gsi_routing_enabled()) {
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/* nothing to do */
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return 0;
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}
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r = ioctl(flic->fd, KVM_SET_DEVICE_ATTR, &attr);
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return r ? -errno : 0;
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}
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static int kvm_s390_io_adapter_map(S390FLICState *fs, uint32_t id,
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uint64_t map_addr, bool do_map)
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{
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struct kvm_s390_io_adapter_req req = {
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.id = id,
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.type = do_map ? KVM_S390_IO_ADAPTER_MAP : KVM_S390_IO_ADAPTER_UNMAP,
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.addr = map_addr,
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};
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struct kvm_device_attr attr = {
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.group = KVM_DEV_FLIC_ADAPTER_MODIFY,
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.addr = (uint64_t)&req,
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};
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KVMS390FLICState *flic = KVM_S390_FLIC(fs);
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int r;
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if (!kvm_gsi_routing_enabled()) {
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/* nothing to do */
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return 0;
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}
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r = ioctl(flic->fd, KVM_SET_DEVICE_ATTR, &attr);
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return r ? -errno : 0;
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}
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static int kvm_s390_add_adapter_routes(S390FLICState *fs,
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AdapterRoutes *routes)
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{
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int ret, i;
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uint64_t ind_offset = routes->adapter.ind_offset;
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for (i = 0; i < routes->num_routes; i++) {
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ret = kvm_irqchip_add_adapter_route(kvm_state, &routes->adapter);
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if (ret < 0) {
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goto out_undo;
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}
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routes->gsi[i] = ret;
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routes->adapter.ind_offset++;
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}
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kvm_irqchip_commit_routes(kvm_state);
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/* Restore passed-in structure to original state. */
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routes->adapter.ind_offset = ind_offset;
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return 0;
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out_undo:
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while (--i >= 0) {
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kvm_irqchip_release_virq(kvm_state, routes->gsi[i]);
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routes->gsi[i] = -1;
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}
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routes->adapter.ind_offset = ind_offset;
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return ret;
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}
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static void kvm_s390_release_adapter_routes(S390FLICState *fs,
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AdapterRoutes *routes)
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{
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int i;
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for (i = 0; i < routes->num_routes; i++) {
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if (routes->gsi[i] >= 0) {
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kvm_irqchip_release_virq(kvm_state, routes->gsi[i]);
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routes->gsi[i] = -1;
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}
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}
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}
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/**
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* kvm_flic_save - Save pending floating interrupts
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* @f: QEMUFile containing migration state
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* @opaque: pointer to flic device state
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* @size: ignored
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*
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* Note: Pass buf and len to kernel. Start with one page and
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* increase until buffer is sufficient or maxium size is
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* reached
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*/
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static int kvm_flic_save(QEMUFile *f, void *opaque, size_t size,
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VMStateField *field, QJSON *vmdesc)
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{
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KVMS390FLICState *flic = opaque;
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int len = FLIC_SAVE_INITIAL_SIZE;
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void *buf;
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int count;
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int r = 0;
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flic_disable_wait_pfault((struct KVMS390FLICState *) opaque);
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buf = g_try_malloc0(len);
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if (!buf) {
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/* Storing FLIC_FAILED into the count field here will cause the
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* target system to fail when attempting to load irqs from the
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* migration state */
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error_report("flic: couldn't allocate memory");
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qemu_put_be64(f, FLIC_FAILED);
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return -ENOMEM;
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}
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count = __get_all_irqs(flic, &buf, len);
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if (count < 0) {
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error_report("flic: couldn't retrieve irqs from kernel, rc %d",
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count);
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/* Storing FLIC_FAILED into the count field here will cause the
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* target system to fail when attempting to load irqs from the
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* migration state */
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qemu_put_be64(f, FLIC_FAILED);
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r = count;
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} else {
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qemu_put_be64(f, count);
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qemu_put_buffer(f, (uint8_t *) buf,
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count * sizeof(struct kvm_s390_irq));
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}
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g_free(buf);
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return r;
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}
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/**
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* kvm_flic_load - Load pending floating interrupts
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* @f: QEMUFile containing migration state
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* @opaque: pointer to flic device state
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* @size: ignored
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*
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* Returns: value of flic_enqueue_irqs, -EINVAL on error
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* Note: Do nothing when no interrupts where stored
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* in QEMUFile
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*/
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static int kvm_flic_load(QEMUFile *f, void *opaque, size_t size,
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VMStateField *field)
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{
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uint64_t len = 0;
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uint64_t count = 0;
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void *buf = NULL;
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int r = 0;
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flic_enable_pfault((struct KVMS390FLICState *) opaque);
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count = qemu_get_be64(f);
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len = count * sizeof(struct kvm_s390_irq);
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if (count == FLIC_FAILED) {
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r = -EINVAL;
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goto out;
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}
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if (count == 0) {
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r = 0;
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goto out;
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}
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buf = g_try_malloc0(len);
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if (!buf) {
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r = -ENOMEM;
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goto out;
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}
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if (qemu_get_buffer(f, (uint8_t *) buf, len) != len) {
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r = -EINVAL;
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goto out_free;
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}
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r = flic_enqueue_irqs(buf, len, (struct KVMS390FLICState *) opaque);
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out_free:
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g_free(buf);
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out:
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return r;
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}
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typedef struct KVMS390FLICStateMigTmp {
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KVMS390FLICState *parent;
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uint8_t simm;
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uint8_t nimm;
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} KVMS390FLICStateMigTmp;
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static int kvm_flic_ais_pre_save(void *opaque)
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{
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KVMS390FLICStateMigTmp *tmp = opaque;
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KVMS390FLICState *flic = tmp->parent;
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struct kvm_s390_ais_all ais;
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struct kvm_device_attr attr = {
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.group = KVM_DEV_FLIC_AISM_ALL,
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.addr = (uint64_t)&ais,
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.attr = sizeof(ais),
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};
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if (ioctl(flic->fd, KVM_GET_DEVICE_ATTR, &attr)) {
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error_report("Failed to retrieve kvm flic ais states");
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return -EINVAL;
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}
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tmp->simm = ais.simm;
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tmp->nimm = ais.nimm;
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return 0;
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}
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static int kvm_flic_ais_post_load(void *opaque, int version_id)
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{
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KVMS390FLICStateMigTmp *tmp = opaque;
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KVMS390FLICState *flic = tmp->parent;
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struct kvm_s390_ais_all ais = {
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.simm = tmp->simm,
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.nimm = tmp->nimm,
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};
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struct kvm_device_attr attr = {
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.group = KVM_DEV_FLIC_AISM_ALL,
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.addr = (uint64_t)&ais,
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};
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/* This can happen when the user mis-configures its guests in an
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* incompatible fashion or without a CPU model. For example using
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* qemu with -cpu host (which is not migration safe) and do a
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* migration from a host that has AIS to a host that has no AIS.
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* In that case the target system will reject the migration here.
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*/
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if (!ais_needed(flic)) {
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return -ENOSYS;
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}
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return ioctl(flic->fd, KVM_SET_DEVICE_ATTR, &attr) ? -errno : 0;
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}
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static const VMStateDescription kvm_s390_flic_ais_tmp = {
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.name = "s390-flic-ais-tmp",
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.pre_save = kvm_flic_ais_pre_save,
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.post_load = kvm_flic_ais_post_load,
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.fields = (VMStateField[]) {
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VMSTATE_UINT8(simm, KVMS390FLICStateMigTmp),
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VMSTATE_UINT8(nimm, KVMS390FLICStateMigTmp),
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VMSTATE_END_OF_LIST()
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}
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};
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static const VMStateDescription kvm_s390_flic_vmstate_ais = {
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.name = "s390-flic/ais",
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.version_id = 1,
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.minimum_version_id = 1,
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.needed = ais_needed,
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.fields = (VMStateField[]) {
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VMSTATE_WITH_TMP(KVMS390FLICState, KVMS390FLICStateMigTmp,
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kvm_s390_flic_ais_tmp),
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VMSTATE_END_OF_LIST()
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}
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};
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static const VMStateDescription kvm_s390_flic_vmstate = {
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/* should have been like kvm-s390-flic,
|
|
* can't change without breaking compat */
|
|
.name = "s390-flic",
|
|
.version_id = FLIC_SAVEVM_VERSION,
|
|
.minimum_version_id = FLIC_SAVEVM_VERSION,
|
|
.fields = (VMStateField[]) {
|
|
{
|
|
.name = "irqs",
|
|
.info = &(const VMStateInfo) {
|
|
.name = "irqs",
|
|
.get = kvm_flic_load,
|
|
.put = kvm_flic_save,
|
|
},
|
|
.flags = VMS_SINGLE,
|
|
},
|
|
VMSTATE_END_OF_LIST()
|
|
},
|
|
.subsections = (const VMStateDescription * []) {
|
|
&kvm_s390_flic_vmstate_ais,
|
|
NULL
|
|
}
|
|
};
|
|
|
|
typedef struct KVMS390FLICStateClass {
|
|
S390FLICStateClass parent_class;
|
|
DeviceRealize parent_realize;
|
|
} KVMS390FLICStateClass;
|
|
|
|
#define KVM_S390_FLIC_GET_CLASS(obj) \
|
|
OBJECT_GET_CLASS(KVMS390FLICStateClass, (obj), TYPE_KVM_S390_FLIC)
|
|
|
|
#define KVM_S390_FLIC_CLASS(klass) \
|
|
OBJECT_CLASS_CHECK(KVMS390FLICStateClass, (klass), TYPE_KVM_S390_FLIC)
|
|
|
|
static void kvm_s390_flic_realize(DeviceState *dev, Error **errp)
|
|
{
|
|
KVMS390FLICState *flic_state = KVM_S390_FLIC(dev);
|
|
struct kvm_create_device cd = {0};
|
|
struct kvm_device_attr test_attr = {0};
|
|
int ret;
|
|
Error *errp_local = NULL;
|
|
|
|
KVM_S390_FLIC_GET_CLASS(dev)->parent_realize(dev, &errp_local);
|
|
if (errp_local) {
|
|
goto fail;
|
|
}
|
|
flic_state->fd = -1;
|
|
if (!kvm_check_extension(kvm_state, KVM_CAP_DEVICE_CTRL)) {
|
|
error_setg_errno(&errp_local, errno, "KVM is missing capability"
|
|
" KVM_CAP_DEVICE_CTRL");
|
|
trace_flic_no_device_api(errno);
|
|
goto fail;
|
|
}
|
|
|
|
cd.type = KVM_DEV_TYPE_FLIC;
|
|
ret = kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd);
|
|
if (ret < 0) {
|
|
error_setg_errno(&errp_local, errno, "Creating the KVM device failed");
|
|
trace_flic_create_device(errno);
|
|
goto fail;
|
|
}
|
|
flic_state->fd = cd.fd;
|
|
|
|
/* Check clear_io_irq support */
|
|
test_attr.group = KVM_DEV_FLIC_CLEAR_IO_IRQ;
|
|
flic_state->clear_io_supported = !ioctl(flic_state->fd,
|
|
KVM_HAS_DEVICE_ATTR, test_attr);
|
|
return;
|
|
fail:
|
|
error_propagate(errp, errp_local);
|
|
}
|
|
|
|
static void kvm_s390_flic_reset(DeviceState *dev)
|
|
{
|
|
KVMS390FLICState *flic = KVM_S390_FLIC(dev);
|
|
S390FLICState *fs = S390_FLIC_COMMON(dev);
|
|
struct kvm_device_attr attr = {
|
|
.group = KVM_DEV_FLIC_CLEAR_IRQS,
|
|
};
|
|
int rc = 0;
|
|
uint8_t isc;
|
|
|
|
if (flic->fd == -1) {
|
|
return;
|
|
}
|
|
|
|
flic_disable_wait_pfault(flic);
|
|
|
|
if (fs->ais_supported) {
|
|
for (isc = 0; isc <= MAX_ISC; isc++) {
|
|
rc = kvm_s390_modify_ais_mode(fs, isc, SIC_IRQ_MODE_ALL);
|
|
if (rc) {
|
|
error_report("Failed to reset ais mode for isc %d: %s",
|
|
isc, strerror(-rc));
|
|
}
|
|
}
|
|
}
|
|
|
|
rc = ioctl(flic->fd, KVM_SET_DEVICE_ATTR, &attr);
|
|
if (rc) {
|
|
trace_flic_reset_failed(errno);
|
|
}
|
|
|
|
flic_enable_pfault(flic);
|
|
}
|
|
|
|
static void kvm_s390_flic_class_init(ObjectClass *oc, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(oc);
|
|
S390FLICStateClass *fsc = S390_FLIC_COMMON_CLASS(oc);
|
|
|
|
KVM_S390_FLIC_CLASS(oc)->parent_realize = dc->realize;
|
|
dc->realize = kvm_s390_flic_realize;
|
|
dc->vmsd = &kvm_s390_flic_vmstate;
|
|
dc->reset = kvm_s390_flic_reset;
|
|
fsc->register_io_adapter = kvm_s390_register_io_adapter;
|
|
fsc->io_adapter_map = kvm_s390_io_adapter_map;
|
|
fsc->add_adapter_routes = kvm_s390_add_adapter_routes;
|
|
fsc->release_adapter_routes = kvm_s390_release_adapter_routes;
|
|
fsc->clear_io_irq = kvm_s390_clear_io_flic;
|
|
fsc->modify_ais_mode = kvm_s390_modify_ais_mode;
|
|
fsc->inject_airq = kvm_s390_inject_airq;
|
|
}
|
|
|
|
static const TypeInfo kvm_s390_flic_info = {
|
|
.name = TYPE_KVM_S390_FLIC,
|
|
.parent = TYPE_S390_FLIC_COMMON,
|
|
.instance_size = sizeof(KVMS390FLICState),
|
|
.class_size = sizeof(KVMS390FLICStateClass),
|
|
.class_init = kvm_s390_flic_class_init,
|
|
};
|
|
|
|
static void kvm_s390_flic_register_types(void)
|
|
{
|
|
type_register_static(&kvm_s390_flic_info);
|
|
}
|
|
|
|
type_init(kvm_s390_flic_register_types)
|