MSI vectors can be masked and unmasked individually when using the MSI-X capability, or when the classic MSI capability supports Per-Vector Masking. At the moment we incorrectly initialize the guest's view of the vectors (virt_state) as masked, so when using a MSI capability without Per-Vector Masking, the vectors are never unmasked and MSIs don't work. Initialize them unmasked instead. Since VFIO doesn't support per-vector masking we implement it by disconnecting the irqfd, and keep track of it with the vector's phys_state. Initially the irqfd is not connected so phys_state is masked. Reported-by: Vivek Gautam <vivek.gautam@xxxxxxx> Signed-off-by: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx> --- vfio/pci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/vfio/pci.c b/vfio/pci.c index 78f5ca5e..a10b5528 100644 --- a/vfio/pci.c +++ b/vfio/pci.c @@ -1182,7 +1182,7 @@ static int vfio_pci_init_msis(struct kvm *kvm, struct vfio_device *vdev, entry = &msis->entries[i]; entry->gsi = -1; entry->eventfd = -1; - msi_set_masked(entry->virt_state, true); + msi_set_masked(entry->virt_state, false); msi_set_masked(entry->phys_state, true); eventfds[i] = -1; } -- 2.41.0
