xen: Utilize the restore_msi_irqs hook.

to make a hypercall to restore the vectors in the MSI/MSI-X
configuration space.

Signed-off-by: Tang Liang <liang.tang@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 492ade8c978e..249a5ae17d02 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -324,6 +324,32 @@ static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 out:
         return ret;
 }
+
+static void xen_initdom_restore_msi_irqs(struct pci_dev *dev, int irq)
+{
+        int ret = 0;
+
+        if (pci_seg_supported) {
+                struct physdev_pci_device restore_ext;
+
+                restore_ext.seg = pci_domain_nr(dev->bus);
+                restore_ext.bus = dev->bus->number;
+                restore_ext.devfn = dev->devfn;
+                ret = HYPERVISOR_physdev_op(PHYSDEVOP_restore_msi_ext,
+                                        &restore_ext);
+                if (ret == -ENOSYS)
+                        pci_seg_supported = false;
+                WARN(ret && ret != -ENOSYS, "restore_msi_ext -> %d\n", ret);
+        }
+        if (!pci_seg_supported) {
+                struct physdev_restore_msi restore;
+
+                restore.bus = dev->bus->number;
+                restore.devfn = dev->devfn;
+                ret = HYPERVISOR_physdev_op(PHYSDEVOP_restore_msi, &restore);
+                WARN(ret && ret != -ENOSYS, "restore_msi -> %d\n", ret);
+        }
+}
 #endif
 
 static void xen_teardown_msi_irqs(struct pci_dev *dev)
@@ -446,6 +472,7 @@ int __init pci_xen_initial_domain(void)
 #ifdef CONFIG_PCI_MSI
         x86_msi.setup_msi_irqs = xen_initdom_setup_msi_irqs;
         x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
+        x86_msi.restore_msi_irqs = xen_initdom_restore_msi_irqs;
 #endif
         xen_setup_acpi_sci();
         __acpi_register_gsi = acpi_register_gsi_xen;