In compat mode, we allowed host-backed user-space with guest-backed
kernel / device. In this mode, set shader commands was broken since
no relocations were emitted. Fix this.
Cc: <stable@xxxxxxxxxxxxxxx>
Fixes: e8c66efbfe3a ("drm/vmwgfx: Make user resource lookups reference-free during validation")
Signed-off-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
Reviewed-by: Brian Paul <brianp@xxxxxxxxxx>
---
drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
index 2ff7ba04d8c8..315f9efce765 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -2010,6 +2010,11 @@ static int vmw_cmd_set_shader(struct vmw_private *dev_priv,
return 0;
if (cmd->body.shid != SVGA3D_INVALID_ID) {
+ /*
+ * This is the compat shader path - Per device guest-backed
+ * shaders, but user-space thinks it's per context host-
+ * backed shaders.
+ */
res = vmw_shader_lookup(vmw_context_res_man(ctx),
cmd->body.shid, cmd->body.type);
if (!IS_ERR(res)) {
@@ -2017,6 +2022,14 @@ static int vmw_cmd_set_shader(struct vmw_private *dev_priv,
VMW_RES_DIRTY_NONE);
if (unlikely(ret != 0))
return ret;
+
+ ret = vmw_resource_relocation_add
+ (sw_context, res,
+ vmw_ptr_diff(sw_context->buf_start,
+ &cmd->body.shid),
+ vmw_res_rel_normal);
+ if (unlikely(ret != 0))
+ return ret;
}
}
--
2.20.1
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