[PATCH] drm/i915/gvt: do not check len & max_len for lri
Zhenyu Wang
zhenyuw at linux.intel.com
Wed Mar 18 05:26:11 UTC 2020
On 2020.03.04 04:51:21 -0500, Yan Zhao wrote:
> lri ususally of variable len and far exceeding 127 dwords.
>
> Fixes: 00a33be40634 (drm/i915/gvt: Add valid length check for MI variable
> commands)
>
> Signed-off-by: Yan Zhao <yan.y.zhao at intel.com>
Ack for this fix which seems true in practical, suppose our ring shadow already
has sane range check.
Acked-by: Zhenyu Wang <zhenyuw at linux.intel.com>
> ---
> drivers/gpu/drm/i915/gvt/cmd_parser.c | 12 ------------
> 1 file changed, 12 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gvt/cmd_parser.c b/drivers/gpu/drm/i915/gvt/cmd_parser.c
> index 73a2891114a4..151fea215e5c 100644
> --- a/drivers/gpu/drm/i915/gvt/cmd_parser.c
> +++ b/drivers/gpu/drm/i915/gvt/cmd_parser.c
> @@ -965,18 +965,6 @@ static int cmd_handler_lri(struct parser_exec_state *s)
> int i, ret = 0;
> int cmd_len = cmd_length(s);
> struct intel_gvt *gvt = s->vgpu->gvt;
> - u32 valid_len = CMD_LEN(1);
> -
> - /*
> - * Official intel docs are somewhat sloppy , check the definition of
> - * MI_LOAD_REGISTER_IMM.
> - */
> - #define MAX_VALID_LEN 127
> - if ((cmd_len < valid_len) || (cmd_len > MAX_VALID_LEN)) {
> - gvt_err("len is not valid: len=%u valid_len=%u\n",
> - cmd_len, valid_len);
> - return -EFAULT;
> - }
>
> for (i = 1; i < cmd_len; i += 2) {
> if (IS_BROADWELL(gvt->dev_priv) && s->ring_id != RCS0) {
> --
> 2.17.1
>
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> intel-gvt-dev at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gvt-dev
--
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