diff options
| -rw-r--r-- | hw/kvm/pci-assign.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/hw/kvm/pci-assign.c b/hw/kvm/pci-assign.c index 8ee94287ff..896cfe8a59 100644 --- a/hw/kvm/pci-assign.c +++ b/hw/kvm/pci-assign.c @@ -1031,6 +1031,19 @@ static bool assigned_dev_msix_masked(MSIXTableEntry *entry) return (entry->ctrl & cpu_to_le32(0x1)) != 0; } +/* + * When MSI-X is first enabled the vector table typically has all the + * vectors masked, so we can't use that as the obvious test to figure out + * how many vectors to initially enable. Instead we look at the data field + * because this is what worked for pci-assign for a long time. This makes + * sure the physical MSI-X state tracks the guest's view, which is important + * for some VF/PF and PF/fw communication channels. + */ +static bool assigned_dev_msix_skipped(MSIXTableEntry *entry) +{ + return !entry->data; +} + static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev) { AssignedDevice *adev = DO_UPCAST(AssignedDevice, dev, pci_dev); @@ -1041,7 +1054,7 @@ static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev) /* Get the usable entry number for allocating */ for (i = 0; i < adev->msix_max; i++, entry++) { - if (assigned_dev_msix_masked(entry)) { + if (assigned_dev_msix_skipped(entry)) { continue; } entries_nr++; @@ -1070,7 +1083,7 @@ static int assigned_dev_update_msix_mmio(PCIDevice *pci_dev) for (i = 0; i < adev->msix_max; i++, entry++) { adev->msi_virq[i] = -1; - if (assigned_dev_msix_masked(entry)) { + if (assigned_dev_msix_skipped(entry)) { continue; } |