[Qemu-devel] [Intel-gfx][RFC 7/9] drm/i915/gvt: Introduce new VFIO ioctl for device status control

[Yulei Zhang]

Add handling for new VFIO ioctl VFIO_DEVICE_PCI_STATUS_SET to control
the status of mdev device vGPU. vGPU will stop/start rendering according
to the command comes along with the ioctl.

Signed-off-by: Yulei Zhang <address@hidden>
---
 drivers/gpu/drm/i915/gvt/kvmgt.c |  9 +++++++++
 drivers/gpu/drm/i915/gvt/vgpu.c  |  1 +
 include/uapi/linux/vfio.h        | 15 +++++++++++++++
 3 files changed, 25 insertions(+)

diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index c44b319..ac327f7 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -1147,6 +1147,15 @@ static long intel_vgpu_ioctl(struct mdev_device *mdev, 
unsigned int cmd,
        } else if (cmd == VFIO_DEVICE_RESET) {
                intel_gvt_ops->vgpu_reset(vgpu);
                return 0;
+       } else if (cmd == VFIO_DEVICE_PCI_STATUS_SET) {
+               struct vfio_pci_status_set status;
+               minsz = offsetofend(struct vfio_pci_status_set, flags);
+               if (copy_from_user(&status, (void __user *)arg, minsz))
+                       return -EFAULT;
+               if (status.flags == VFIO_DEVICE_PCI_STOP)
+                       intel_gvt_ops->vgpu_deactivate(vgpu);
+               else
+                       intel_gvt_ops->vgpu_activate(vgpu);
        }
 
        return 0;
diff --git a/drivers/gpu/drm/i915/gvt/vgpu.c b/drivers/gpu/drm/i915/gvt/vgpu.c
index 989f353..542bde9 100644
--- a/drivers/gpu/drm/i915/gvt/vgpu.c
+++ b/drivers/gpu/drm/i915/gvt/vgpu.c
@@ -205,6 +205,7 @@ void intel_gvt_activate_vgpu(struct intel_vgpu *vgpu)
 {
        mutex_lock(&vgpu->gvt->lock);
        vgpu->active = true;
+       intel_vgpu_start_schedule(vgpu);
        mutex_unlock(&vgpu->gvt->lock);
 }
 
diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 9ad9ce1..4bb057d 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -503,6 +503,21 @@ struct vfio_pci_hot_reset {
 
 #define VFIO_DEVICE_PCI_HOT_RESET      _IO(VFIO_TYPE, VFIO_BASE + 13)
 
+/**
+ * VFIO_DEVICE_PCI_STATUS_SET - _IOW(VFIO_TYPE, VFIO_BASE + 14,
+ *                                 struct vfio_pci_status_set)
+ *
+ * Return: 0 on success, -errno on failure.
+ */
+struct vfio_pci_status_set{
+       __u32   argsz;
+       __u32   flags;
+#define VFIO_DEVICE_PCI_STOP  (1 << 0)
+#define VFIO_DEVICE_PCI_START (1 << 1)
+};
+
+#define VFIO_DEVICE_PCI_STATUS_SET     _IO(VFIO_TYPE, VFIO_BASE + 14)
+
 /* -------- API for Type1 VFIO IOMMU -------- */
 
 /**
-- 
2.7.4