Patch "drm/vmwgfx: Enable DMA mappings with SEV" has been added to the 6.8-stable tree

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This is a note to let you know that I've just added the patch titled

    drm/vmwgfx: Enable DMA mappings with SEV

to the 6.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-vmwgfx-enable-dma-mappings-with-sev.patch
and it can be found in the queue-6.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 4c08f01934ab67d1d283d5cbaa52b923abcfe4cd Mon Sep 17 00:00:00 2001
From: Zack Rusin <zack.rusin@xxxxxxxxxxxx>
Date: Sun, 7 Apr 2024 22:28:02 -0400
Subject: drm/vmwgfx: Enable DMA mappings with SEV

From: Zack Rusin <zack.rusin@xxxxxxxxxxxx>

commit 4c08f01934ab67d1d283d5cbaa52b923abcfe4cd upstream.

Enable DMA mappings in vmwgfx after TTM has been fixed in commit
3bf3710e3718 ("drm/ttm: Add a generic TTM memcpy move for page-based iomem")

This enables full guest-backed memory support and in particular allows
usage of screen targets as the presentation mechanism.

Signed-off-by: Zack Rusin <zack.rusin@xxxxxxxxxxxx>
Reported-by: Ye Li <ye.li@xxxxxxxxxxxx>
Tested-by: Ye Li <ye.li@xxxxxxxxxxxx>
Fixes: 3b0d6458c705 ("drm/vmwgfx: Refuse DMA operation when SEV encryption is active")
Cc: Broadcom internal kernel review list <bcm-kernel-feedback-list@xxxxxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: <stable@xxxxxxxxxxxxxxx> # v6.6+
Reviewed-by: Martin Krastev <martin.krastev@xxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20240408022802.358641-1-zack.rusin@xxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -666,11 +666,12 @@ static int vmw_dma_select_mode(struct vm
 		[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 (cc_platform_has(CC_ATTR_MEM_ENCRYPT))
-		return -EINVAL;
-
-	if (vmw_force_coherent)
+	/*
+	 * When running with SEV we always want dma mappings, because
+	 * otherwise ttm tt pool pages will bounce through swiotlb running
+	 * out of available space.
+	 */
+	if (vmw_force_coherent || cc_platform_has(CC_ATTR_MEM_ENCRYPT))
 		dev_priv->map_mode = vmw_dma_alloc_coherent;
 	else if (vmw_restrict_iommu)
 		dev_priv->map_mode = vmw_dma_map_bind;


Patches currently in stable-queue which might be from zack.rusin@xxxxxxxxxxxx are

queue-6.8/drm-vmwgfx-enable-dma-mappings-with-sev.patch




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