[Xen-devel] [PATCH 5/7] xen/pci: Utilize the restore_msi_irqs hook.

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

From: Tang Liang <liang.tang@xxxxxxxxxx>

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

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
 arch/x86/pci/xen.c              |   27 +++++++++++++++++++++++++++
 include/xen/interface/physdev.h |    7 +++++++
 2 files changed, 34 insertions(+), 0 deletions(-)

diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 492ade8..249a5ae 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;
diff --git a/include/xen/interface/physdev.h b/include/xen/interface/physdev.h
index c1080d9..0c28989 100644
--- a/include/xen/interface/physdev.h
+++ b/include/xen/interface/physdev.h
@@ -145,6 +145,13 @@ struct physdev_manage_pci {
        uint8_t devfn;
 };
 
+#define PHYSDEVOP_restore_msi            19
+struct physdev_restore_msi {
+       /* IN */
+       uint8_t bus;
+       uint8_t devfn;
+};
+
 #define PHYSDEVOP_manage_pci_add_ext   20
 struct physdev_manage_pci_ext {
        /* IN */
-- 
1.7.7.1


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