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drm/vmwgfx: Refuse DMA operation when SEV encryption is active

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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>
This commit is contained in:
Thomas Hellstrom 2020-01-15 21:48:19 +01:00
parent 81a00960d3
commit 3b0d6458c7
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
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@ -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)