Track the last MSIMessage programmed so we can determine when it has changed and update the routing to the guest.
Signed-off-by: Alex Williamson <[email protected]> --- hw/i386/kvm/pci-assign.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/hw/i386/kvm/pci-assign.c b/hw/i386/kvm/pci-assign.c index 0f83a4c..e09265b 100644 --- a/hw/i386/kvm/pci-assign.c +++ b/hw/i386/kvm/pci-assign.c @@ -134,6 +134,7 @@ typedef struct AssignedDevice { int msi_nr; struct { int virq; + MSIMessage msg; } *msi; MSIXTableEntry *msix_table; hwaddr msix_table_addr; @@ -1015,6 +1016,7 @@ static void assigned_dev_update_msi(PCIDevice *pci_dev) assigned_dev->msi = g_malloc(sizeof(*assigned_dev->msi)); assigned_dev->msi_nr = 1; assigned_dev->msi[0].virq = virq; + assigned_dev->msi[0].msg = msg; if (kvm_device_msi_assign(kvm_state, assigned_dev->dev_id, virq) < 0) { perror("assigned_dev_update_msi: kvm_device_msi_assign"); } @@ -1027,6 +1029,27 @@ static void assigned_dev_update_msi(PCIDevice *pci_dev) } } +static void assigned_dev_update_msi_msg(PCIDevice *pci_dev) +{ + AssignedDevice *assigned_dev = DO_UPCAST(AssignedDevice, dev, pci_dev); + uint8_t ctrl_byte = pci_get_byte(pci_dev->config + pci_dev->msi_cap + + PCI_MSI_FLAGS); + MSIMessage msg; + + if (assigned_dev->assigned_irq_type != ASSIGNED_IRQ_MSI || + !(ctrl_byte & PCI_MSI_FLAGS_ENABLE)) { + return; + } + + msg = msi_get_message(pci_dev, 0); + + if (msg.address != assigned_dev->msi[0].msg.address || + msg.data != assigned_dev->msi[0].msg.data) { + kvm_irqchip_update_msi_route(kvm_state, assigned_dev->msi[0].virq, msg); + assigned_dev->msi[0].msg = msg; + } +} + static bool assigned_dev_msix_masked(MSIXTableEntry *entry) { return (entry->ctrl & cpu_to_le32(0x1)) != 0; @@ -1202,6 +1225,10 @@ static void assigned_dev_pci_write_config(PCIDevice *pci_dev, uint32_t address, if (range_covers_byte(address, len, pci_dev->msi_cap + PCI_MSI_FLAGS)) { assigned_dev_update_msi(pci_dev); + } else if (ranges_overlap(address, len, + pci_dev->msi_cap + PCI_MSI_ADDRESS_LO, + 10 - PCI_MSI_ADDRESS_LO)) { + assigned_dev_update_msi_msg(pci_dev); } } if (assigned_dev->cap.available & ASSIGNED_DEVICE_CAP_MSIX) {
