* [PATCH 6.15 089/178] drm/vmwgfx: Fix guests running with TDX/SEV
[not found] <20250708162236.549307806@linuxfoundation.org>
@ 2025-07-08 16:22 ` Greg Kroah-Hartman
0 siblings, 0 replies; only message in thread
From: Greg Kroah-Hartman @ 2025-07-08 16:22 UTC (permalink / raw)
To: stable
Cc: Greg Kroah-Hartman, patches, Marko Kiiskila, Zack Rusin,
Kirill A. Shutemov, Ingo Molnar, Andrew Morton, Dave Hansen,
Linus Torvalds, Peter Zijlstra, linux-mm, linux-kernel,
Sasha Levin
6.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Marko Kiiskila <marko.kiiskila@broadcom.com>
[ Upstream commit 7dfede7d7edd18c0c91ca854cde8eaaf4ccf97ea ]
Commit 81256a50aa0f ("x86/mm: Make memremap(MEMREMAP_WB) map memory as
encrypted by default") changed the default behavior of
memremap(MEMREMAP_WB) and started mapping memory as encrypted.
The driver requires the fifo memory to be decrypted to communicate with
the host but was relaying on the old default behavior of
memremap(MEMREMAP_WB) and thus broke.
Fix it by explicitly specifying the desired behavior and passing
MEMREMAP_DEC to memremap.
Fixes: 81256a50aa0f ("x86/mm: Make memremap(MEMREMAP_WB) map memory as encrypted by default")
Signed-off-by: Marko Kiiskila <marko.kiiskila@broadcom.com>
Signed-off-by: Zack Rusin <zack.rusin@broadcom.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Link: https://lore.kernel.org/r/20250618192926.1092450-1-zack.rusin@broadcom.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index 0f32471c85332..55c822a61b9ad 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -769,7 +769,7 @@ static int vmw_setup_pci_resources(struct vmw_private *dev,
dev->fifo_mem = devm_memremap(dev->drm.dev,
fifo_start,
fifo_size,
- MEMREMAP_WB);
+ MEMREMAP_WB | MEMREMAP_DEC);
if (IS_ERR(dev->fifo_mem)) {
drm_err(&dev->drm,
--
2.39.5
^ permalink raw reply related [flat|nested] only message in thread