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Subject[PATCH 2/2] drm/vmwgfx: Refuse DMA operation when SEV encryption is active
Date
From: Thomas Hellstrom <thellstrom@vmware.com>

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>
---
drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 5 +++++
1 file changed, 5 insertions(+)

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)
--
2.21.1
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