[Qemu-ppc] [PATCH 3/6] VFIO: EEH address mapping

[Gavin Shan]

For PCI devices that have been passed through from host to guest,
their PCI config address could be different. In order to support
EEH functionality, the host need know the address mapping.

Signed-off-by: Gavin Shan <address@hidden>
---
 hw/misc/vfio.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/hw/misc/vfio.c b/hw/misc/vfio.c
index 0796abf..fdeba9e 100644
--- a/hw/misc/vfio.c
+++ b/hw/misc/vfio.c
@@ -32,6 +32,7 @@
 #include "hw/pci/msi.h"
 #include "hw/pci/msix.h"
 #include "hw/pci/pci.h"
+#include "hw/pci/pci_bus.h"
 #include "qemu-common.h"
 #include "qemu/error-report.h"
 #include "qemu/event_notifier.h"
@@ -3945,6 +3946,29 @@ static void vfio_unregister_err_notifier(VFIODevice 
*vdev)
     event_notifier_cleanup(&vdev->err_notifier);
 }
 
+static void vfio_eeh_addr_map(VFIODevice *vdev, bool map)
+{
+    PCIDevice *pdev = &vdev->pdev;
+    PCIBus *rootbus = pci_device_root_bus(pdev);
+    struct vfio_eeh_info info;
+
+    info.argsz = sizeof(info);
+    info.op = map ? VFIO_EEH_OP_MAP : VFIO_EEH_OP_UNMAP;
+
+    if (map) {
+        info.map.host_domain = vdev->host.domain;
+        info.map.host_cfg_addr = (vdev->host.bus << 8) |
+                       PCI_DEVFN(vdev->host.slot, vdev->host.function);
+        info.map.guest_buid = rootbus->sysdata;
+        info.map.guest_cfg_addr = (pci_bus_num(pdev->bus) << 8) | pdev->devfn;
+    } else {
+        info.unmap.buid = rootbus->sysdata;
+        info.unmap.cfg_addr = (pci_bus_num(pdev->bus) << 8) | pdev->devfn;
+    }
+
+    ioctl(vdev->group->container->fd, VFIO_EEH_INFO, &info);
+}
+
 static int vfio_initfn(PCIDevice *pdev)
 {
     VFIODevice *pvdev, *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
@@ -4085,6 +4109,7 @@ static int vfio_initfn(PCIDevice *pdev)
 
     add_boot_device_path(vdev->bootindex, &pdev->qdev, NULL);
     vfio_register_err_notifier(vdev);
+    vfio_eeh_addr_map(vdev, true);
 
     return 0;
 
@@ -4104,6 +4129,7 @@ static void vfio_exitfn(PCIDevice *pdev)
     VFIODevice *vdev = DO_UPCAST(VFIODevice, pdev, pdev);
     VFIOGroup *group = vdev->group;
 
+    vfio_eeh_addr_map(vdev, false);
     vfio_unregister_err_notifier(vdev);
     pci_device_set_intx_routing_notifier(&vdev->pdev, NULL);
     vfio_disable_interrupts(vdev);
-- 
1.8.3.2