Patch "drm/i915/gvt: set the correct default value of CTX STATUS PTR" has been added to the 4.10-stable tree

Patch "drm/i915/gvt: set the correct default value of CTX STATUS PTR" has been added to the 4.10-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    drm/i915/gvt: set the correct default value of CTX STATUS PTR

to the 4.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-i915-gvt-set-the-correct-default-value-of-ctx-status-ptr.patch
and it can be found in the queue-4.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From a34f83639490a5cc11a9d5c1b3773d4b6eb69a9e Mon Sep 17 00:00:00 2001
From: Min He <min.he@intel.com>
Date: Thu, 6 Apr 2017 11:01:45 +0800
Subject: drm/i915/gvt: set the correct default value of CTX STATUS PTR

From: Min He <min.he@intel.com>

commit a34f83639490a5cc11a9d5c1b3773d4b6eb69a9e upstream.

Fix wrong initial csb read pointer value. This fixes the random
engine timeout issue in guest when guest boots up.

Fixes: 8453d674ae7e ("drm/i915/gvt: vGPU execlist virtualization")
Signed-off-by: Min He <min.he@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/i915/gvt/execlist.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/gvt/execlist.c
+++ b/drivers/gpu/drm/i915/gvt/execlist.c
@@ -778,7 +778,8 @@ static void init_vgpu_execlist(struct in
 			_EL_OFFSET_STATUS_PTR);
 
 	ctx_status_ptr.dw = vgpu_vreg(vgpu, ctx_status_ptr_reg);
-	ctx_status_ptr.read_ptr = ctx_status_ptr.write_ptr = 0x7;
+	ctx_status_ptr.read_ptr = 0;
+	ctx_status_ptr.write_ptr = 0x7;
 	vgpu_vreg(vgpu, ctx_status_ptr_reg) = ctx_status_ptr.dw;
 }
 


Patches currently in stable-queue which might be from min.he@intel.com are

queue-4.10/drm-i915-gvt-set-the-correct-default-value-of-ctx-status-ptr.patch