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virtio: bugfix

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A last minute fix for a use of a vector after it's released.
 
 Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge tag 'for_upstream' of https://git.kernel.org/pub/scm/virt/kvm/mst/qemu into staging

virtio: bugfix

A last minute fix for a use of a vector after it's released.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

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# gpg: Signature made Mon 15 Apr 2024 11:51:55 BST
# gpg:                using RSA key 5D09FD0871C8F85B94CA8A0D281F0DB8D28D5469
# gpg:                issuer "mst@redhat.com"
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>" [full]
# gpg:                 aka "Michael S. Tsirkin <mst@redhat.com>" [full]
# Primary key fingerprint: 0270 606B 6F3C DF3D 0B17  0970 C350 3912 AFBE 8E67
#      Subkey fingerprint: 5D09 FD08 71C8 F85B 94CA  8A0D 281F 0DB8 D28D 5469

* tag 'for_upstream' of https://git.kernel.org/pub/scm/virt/kvm/mst/qemu:
  virtio-pci: fix use of a released vector

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2024-04-15 13:35:32 +01:00
commit 0c2a380748
1 changed files with 35 additions and 2 deletions
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37
hw/virtio/virtio-pci.c
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@ -1424,6 +1424,38 @@ static int virtio_pci_add_mem_cap(VirtIOPCIProxy *proxy,
return offset;
}
static void virtio_pci_set_vector(VirtIODevice *vdev,
VirtIOPCIProxy *proxy,
int queue_no, uint16_t old_vector,
uint16_t new_vector)
{
bool kvm_irqfd = (vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) &&
msix_enabled(&proxy->pci_dev) && kvm_msi_via_irqfd_enabled();
if (new_vector == old_vector) {
return;
}
/*
* If the device uses irqfd and the vector changes after DRIVER_OK is
* set, we need to release the old vector and set up the new one.
* Otherwise just need to set the new vector on the device.
*/
if (kvm_irqfd && old_vector != VIRTIO_NO_VECTOR) {
kvm_virtio_pci_vector_release_one(proxy, queue_no);
}
/* Set the new vector on the device. */
if (queue_no == VIRTIO_CONFIG_IRQ_IDX) {
vdev->config_vector = new_vector;
} else {
virtio_queue_set_vector(vdev, queue_no, new_vector);
}
/* If the new vector changed need to set it up. */
if (kvm_irqfd && new_vector != VIRTIO_NO_VECTOR) {
kvm_virtio_pci_vector_use_one(proxy, queue_no);
}
}
int virtio_pci_add_shm_cap(VirtIOPCIProxy *proxy,
uint8_t bar, uint64_t offset, uint64_t length,
uint8_t id)
@ -1570,7 +1602,8 @@ static void virtio_pci_common_write(void *opaque, hwaddr addr,
} else {
val = VIRTIO_NO_VECTOR;
}
vdev->config_vector = val;
virtio_pci_set_vector(vdev, proxy, VIRTIO_CONFIG_IRQ_IDX,
vdev->config_vector, val);
break;
case VIRTIO_PCI_COMMON_STATUS:
if (!(val & VIRTIO_CONFIG_S_DRIVER_OK)) {
@ -1610,7 +1643,7 @@ static void virtio_pci_common_write(void *opaque, hwaddr addr,
} else {
val = VIRTIO_NO_VECTOR;
}
virtio_queue_set_vector(vdev, vdev->queue_sel, val);
virtio_pci_set_vector(vdev, proxy, vdev->queue_sel, vector, val);
break;
case VIRTIO_PCI_COMMON_Q_ENABLE:
if (val == 1) {