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authorThomas Hellstrom <thellstrom@vmware.com>2020-01-15 21:48:19 +0100
committerThomas Hellstrom <thellstrom@vmware.com>2020-03-12 12:00:07 +0100
commit3b0d6458c7052af1795489976b600797ca07f7e9 (patch)
tree01bcc6780edc6190a9e853b3af4555dcb58e3cd7 /drivers/gpu/drm/vmwgfx
parent81a00960d3fa83bbff9939ff52e89f0b74801937 (diff)
drm/vmwgfx: Refuse DMA operation when SEV encryption is active
TTM doesn't yet fully support mapping of DMA memory when SEV is active, so in that case, refuse DMA operation. For guest-backed object operation this means 3D acceleration will be disabled. For host-backed, VRAM will be used for data transfer between the guest and the device. Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com> Reviewed-by: Brian Paul <brianp@vmware.com>
Diffstat (limited to 'drivers/gpu/drm/vmwgfx')
-rw-r--r--drivers/gpu/drm/vmwgfx/vmwgfx_drv.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index f2ec3155468d..4f58364421ce 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -29,6 +29,7 @@
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/pci.h>
+#include <linux/mem_encrypt.h>
#include <drm/drm_drv.h>
#include <drm/drm_ioctl.h>
@@ -575,6 +576,10 @@ static int vmw_dma_select_mode(struct vmw_private *dev_priv)
[vmw_dma_map_populate] = "Caching DMA mappings.",
[vmw_dma_map_bind] = "Giving up DMA mappings early."};
+ /* TTM currently doesn't fully support SEV encryption. */
+ if (mem_encrypt_active())
+ return -EINVAL;
+
if (vmw_force_coherent)
dev_priv->map_mode = vmw_dma_alloc_coherent;
else if (vmw_restrict_iommu)