[PATCH 03/10] drm/i915/gvt: filter cmds "srm" and "lrm" in cmd_handler

[Yan Zhao]

do not allow "srm" and "lrm" except for GEN8_L3SQCREG4 and 0x21f0.

Cc: Colin Xu <colin.xu at intel.com>
Cc: Kevin Tian <kevin.tian at intel.com>
Signed-off-by: Yan Zhao <yan.y.zhao at intel.com>
---
 drivers/gpu/drm/i915/gvt/cmd_parser.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/i915/gvt/cmd_parser.c b/drivers/gpu/drm/i915/gvt/cmd_parser.c
index a51ff27ff6a8..efd0f7dd22de 100644
--- a/drivers/gpu/drm/i915/gvt/cmd_parser.c
+++ b/drivers/gpu/drm/i915/gvt/cmd_parser.c
@@ -980,6 +980,17 @@ static int cmd_reg_handler(struct parser_exec_state *s,
 		patch_value(s, cmd_ptr(s, index), VGT_PVINFO_PAGE);
 	}
 
+	if (!strncmp(cmd, "srm", 3) ||
+			!strncmp(cmd, "lrm", 3)) {
+		if (offset != i915_mmio_reg_offset(GEN8_L3SQCREG4) &&
+				offset != 0x21f0) {
+			gvt_vgpu_err("%s access to register (%x)\n",
+					cmd, offset);
+			return -EPERM;
+		} else
+			return 0;
+	}
+
 	if (is_cmd_update_pdps(offset, s) &&
 	    cmd_pdp_mmio_update_handler(s, offset, index))
 		return -EINVAL;
-- 
2.17.1