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    Subject[PATCH 4.10 51/69] drm/i915/gvt: set the correct default value of CTX STATUS PTR
    Date
    4.10-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    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;
    }


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