[PATCH 1/2] drm/i915/gvt: Fix BDW command parser regression

[Colin Xu]

On Wed, 14 Apr 2021, Zhenyu Wang wrote:

> On BDW new Windows driver has brought extra registers to handle for
> LRM/LRR command in WA ctx. Add allowed registers in cmd parser for BDW.
>
> Cc: Alex Williamson <alex.williamson at redhat.com>
> Cc: Yan Zhao <yan.y.zhao at intel.com>
> Cc: stable at vger.kernel.org
> Fixes: 73a37a43d1b0 ("drm/i915/gvt: filter cmds "lrr-src" and "lrr-dst" in cmd_handler")
> Signed-off-by: Zhenyu Wang <zhenyuw at linux.intel.com>
> ---
> drivers/gpu/drm/i915/gvt/cmd_parser.c | 19 +++++++++++++------
> 1 file changed, 13 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gvt/cmd_parser.c b/drivers/gpu/drm/i915/gvt/cmd_parser.c
> index fef1e857cefc..01c1d1b36acd 100644
> --- a/drivers/gpu/drm/i915/gvt/cmd_parser.c
> +++ b/drivers/gpu/drm/i915/gvt/cmd_parser.c
> @@ -916,19 +916,26 @@ static int cmd_reg_handler(struct parser_exec_state *s,
>
> 	if (!strncmp(cmd, "srm", 3) ||
> 			!strncmp(cmd, "lrm", 3)) {
> -		if (offset != i915_mmio_reg_offset(GEN8_L3SQCREG4) &&
> -				offset != 0x21f0) {
> +		if (offset == i915_mmio_reg_offset(GEN8_L3SQCREG4) ||
> +		    offset == 0x21f0 ||
> +		    (IS_BROADWELL(gvt->gt->i915) &&
> +		     offset == i915_mmio_reg_offset(INSTPM)))
> +			return 0;
> +		else {
> 			gvt_vgpu_err("%s access to register (%x)\n",
> 					cmd, offset);
> 			return -EPERM;
> -		} else
> -			return 0;
> +		}
> 	}
>
> 	if (!strncmp(cmd, "lrr-src", 7) ||
> 			!strncmp(cmd, "lrr-dst", 7)) {
> -		gvt_vgpu_err("not allowed cmd %s\n", cmd);
> -		return -EPERM;
> +		if (IS_BROADWELL(gvt->gt->i915) && offset == 0x215c)
> +			return 0;
> +		else {
> +			gvt_vgpu_err("not allowed cmd %s reg (%x)\n", cmd, offset);
> +			return -EPERM;
> +		}
> 	}
>
> 	if (!strncmp(cmd, "pipe_ctrl", 9)) {
> -- 
> 2.31.0
>
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> intel-gvt-dev at lists.freedesktop.org
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>

Reviewed-by: Colin Xu <colin.xu at intel.com>

Thanks for the timely fix for BDW!