From 6e90293618ed476d6b11f82ce724efbb9e9a071b Mon Sep 17 00:00:00 2001 From: Zack Rusin Date: Thu, 1 Dec 2022 12:53:41 -0500 Subject: [PATCH] drm/vmwgfx: Don't use screen objects when SEV is active 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: # v5.7+ Signed-off-by: Zack Rusin Reported-by: Nicholas Hunt Reviewed-by: Martin Krastev Link: https://patchwork.freedesktop.org/patch/msgid/20221201175341.491884-1-zack@kde.org --- drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c b/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c index ecd3c2fc..9c79873 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_scrn.c @@ -949,6 +949,10 @@ int vmw_kms_sou_init_display(struct vmw_private *dev_priv) 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; } -- 2.7.4