core: pci: Mask MSI-X vectors on reset also physically

This ensures that no vector is left over from the previous usage that
could trigger unexpected or even invalid interrupts when the new user
starts configuring the device.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

hypervisor/pci.c

@@ -577,10 +577,16 @@ void pci_reset_device(struct pci_device *device)
 	pci_write_config(device->info->bdf, PCI_CFG_COMMAND,
 			 PCI_CMD_INTX_OFF, 2);
 
-	for_each_pci_cap(cap, device, n)
+	for_each_pci_cap(cap, device, n) {
 		if (cap->id == PCI_CAP_MSI || cap->id == PCI_CAP_MSIX)
 			/* Disable MSI/MSI-X by clearing the control word. */
 			pci_write_config(device->info->bdf, cap->start+2, 0, 2);
+		if (cap->id == PCI_CAP_MSIX)
+			/* Mask each MSI-X vector also physically. */
+			for (n = 0; n < device->info->num_msix_vectors; n++)
+				mmio_write32(&device->msix_table[n].raw[3],
+					     device->msix_vectors[n].raw[3]);
+	}
 }
 
 static int pci_add_physical_device(struct cell *cell, struct pci_device *device)