From: Zack Rusin zackr@vmware.com
commit 6e90293618ed476d6b11f82ce724efbb9e9a071b upstream.
When SEV is enabled gmr's and mob's are explicitly disabled because the encrypted system memory can not be used by the hypervisor.
The driver was disabling GMR's but the presentation code, which depends on GMR's, wasn't honoring it which lead to black screen on hosts with SEV enabled.
Make sure screen objects presentation is not used when guest memory regions have been disabled to fix presentation on SEV enabled hosts.
Fixes: 3b0d6458c705 ("drm/vmwgfx: Refuse DMA operation when SEV encryption is active") Cc: stable@vger.kernel.org # v5.7+ Signed-off-by: Zack Rusin zackr@vmware.com Reported-by: Nicholas Hunt nhunt@vmware.com Reviewed-by: Martin Krastev krastevm@vmware.com Link: https://patchwork.freedesktop.org/patch/msgid/20221201175341.491884-1-zack@k... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c @@ -953,6 +953,10 @@ int vmw_kms_sou_init_display(struct vmw_ struct drm_device *dev = &dev_priv->drm; int i, ret;
+ /* Screen objects won't work if GMR's aren't available */ + if (!dev_priv->has_gmr) + return -ENOSYS; + if (!(dev_priv->capabilities & SVGA_CAP_SCREEN_OBJECT_2)) { return -ENOSYS; }