Merge tag 'gvt-next-2018-09-04' of https://github.com/intel/gvt-linux into drm-intel...

[thirdparty/kernel/stable.git] / drivers / gpu / drm / i915 / gvt / kvmgt.c

diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index 60d9f5d9fb1eb175dce477b1957359bfbc510dca..a22d539b9d4e721884e605d0d4106277db4c6bf8 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -644,6 +644,17 @@ out:
        return ret;
 }
 
+static void intel_vgpu_release_msi_eventfd_ctx(struct intel_vgpu *vgpu)
+{
+       struct eventfd_ctx *trigger;
+
+       trigger = vgpu->vdev.msi_trigger;
+       if (trigger) {
+               eventfd_ctx_put(trigger);
+               vgpu->vdev.msi_trigger = NULL;
+       }
+}
+
 static void __intel_vgpu_release(struct intel_vgpu *vgpu)
 {
        struct kvmgt_guest_info *info;
@@ -668,6 +679,8 @@ static void __intel_vgpu_release(struct intel_vgpu *vgpu)
        info = (struct kvmgt_guest_info *)vgpu->handle;
        kvmgt_guest_exit(info);
 
+       intel_vgpu_release_msi_eventfd_ctx(vgpu);
+
        vgpu->vdev.kvm = NULL;
        vgpu->handle = 0;
 }
@@ -1048,7 +1061,8 @@ static int intel_vgpu_set_msi_trigger(struct intel_vgpu *vgpu,
                        return PTR_ERR(trigger);
                }
                vgpu->vdev.msi_trigger = trigger;
-       }
+       } else if ((flags & VFIO_IRQ_SET_DATA_NONE) && !count)
+               intel_vgpu_release_msi_eventfd_ctx(vgpu);
 
        return 0;
 }
@@ -1653,6 +1667,18 @@ static int kvmgt_inject_msi(unsigned long handle, u32 addr, u16 data)
        info = (struct kvmgt_guest_info *)handle;
        vgpu = info->vgpu;
 
+       /*
+        * When guest is poweroff, msi_trigger is set to NULL, but vgpu's
+        * config and mmio register isn't restored to default during guest
+        * poweroff. If this vgpu is still used in next vm, this vgpu's pipe
+        * may be enabled, then once this vgpu is active, it will get inject
+        * vblank interrupt request. But msi_trigger is null until msi is
+        * enabled by guest. so if msi_trigger is null, success is still
+        * returned and don't inject interrupt into guest.
+        */
+       if (vgpu->vdev.msi_trigger == NULL)
+               return 0;
+
        if (eventfd_signal(vgpu->vdev.msi_trigger, 1) == 1)
                return 0;