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@xxxxxxxxxxxxxxx> know about it. >From a34f83639490a5cc11a9d5c1b3773d4b6eb69a9e Mon Sep 17 00:00:00 2001 From: Min He <min.he@xxxxxxxxx> 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@xxxxxxxxx> 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@xxxxxxxxx> Signed-off-by: Zhenyu Wang <zhenyuw@xxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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@xxxxxxxxx are queue-4.10/drm-i915-gvt-set-the-correct-default-value-of-ctx-status-ptr.patch