Merge tag 'gvt-fixes-2018-04-19' of https://github.com/intel/gvt-linux into drm-intel-next-fixes

gvt-fixes-2018-04-19

- cmd parser error path mem leak fix (Colin)
- fix dp aux header validation (Changbin)
- sanity check on pfn after vfio pin page (Changbin)
- fix msi eventfd put (Xiong)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180419073948.4mojv7xaxxvfuyud@zhen-hp.sh.intel.com

drivers/gpu/drm/i915/gvt/cmd_parser.c

@@ -2909,6 +2909,7 @@ static int init_cmd_table(struct intel_gvt *gvt)
 		if (info) {
 			gvt_err("%s %s duplicated\n", e->info->name,
 					info->name);
+			kfree(e);
 			return -EEXIST;
 		}
 

drivers/gpu/drm/i915/gvt/display.h

@@ -67,7 +67,7 @@
 #define AUX_NATIVE_REPLY_NAK    (0x1 << 4)
 #define AUX_NATIVE_REPLY_DEFER  (0x2 << 4)
 
-#define AUX_BURST_SIZE          16
+#define AUX_BURST_SIZE          20
 
 /* DPCD addresses */
 #define DPCD_REV			0x000

drivers/gpu/drm/i915/gvt/handlers.c

@@ -903,11 +903,14 @@ static int dp_aux_ch_ctl_mmio_write(struct intel_vgpu *vgpu,
 		}
 
 		/*
-		 * Write request format: (command + address) occupies
-		 * 3 bytes, followed by (len + 1) bytes of data.
+		 * Write request format: Headr (command + address + size) occupies
+		 * 4 bytes, followed by (len + 1) bytes of data. See details at
+		 * intel_dp_aux_transfer().
 		 */
-		if (WARN_ON((len + 4) > AUX_BURST_SIZE))
+		if ((len + 1 + 4) > AUX_BURST_SIZE) {
+			gvt_vgpu_err("dp_aux_header: len %d is too large\n", len);
 			return -EINVAL;
+		}
 
 		/* unpack data from vreg to buf */
 		for (t = 0; t < 4; t++) {
@@ -971,8 +974,10 @@ static int dp_aux_ch_ctl_mmio_write(struct intel_vgpu *vgpu,
 		/*
 		 * Read reply format: ACK (1 byte) plus (len + 1) bytes of data.
 		 */
-		if (WARN_ON((len + 2) > AUX_BURST_SIZE))
+		if ((len + 2) > AUX_BURST_SIZE) {
+			gvt_vgpu_err("dp_aux_header: len %d is too large\n", len);
 			return -EINVAL;
+		}
 
 		/* read from virtual DPCD to vreg */
 		/* first 4 bytes: [ACK][addr][addr+1][addr+2] */

drivers/gpu/drm/i915/gvt/kvmgt.c

@@ -123,6 +123,12 @@ static int gvt_dma_map_page(struct intel_vgpu *vgpu, unsigned long gfn,
 		return -EINVAL;
 	}
 
+	if (!pfn_valid(pfn)) {
+		gvt_vgpu_err("pfn 0x%lx is not mem backed\n", pfn);
+		vfio_unpin_pages(mdev_dev(vgpu->vdev.mdev), &gfn, 1);
+		return -EINVAL;
+	}
+
 	/* Setup DMA mapping. */
 	page = pfn_to_page(pfn);
 	*dma_addr = dma_map_page(dev, page, 0, PAGE_SIZE,
@@ -583,6 +589,17 @@ static int intel_vgpu_open(struct mdev_device *mdev)
 	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;
@@ -607,6 +624,8 @@ 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;
 }
@@ -987,7 +1006,8 @@ 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;
 }
@@ -1592,6 +1612,18 @@ 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;