drm/vmwgfx: Refuse DMA operation when SEV encryption is active (3b0d6458) · Commits · 戴 / test

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 −0

Original line number	Diff line number	Diff line
		@@ -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)

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