linux-kernel - Re: [PATCH] drm/vmwgfx: Fix guests running with TDX/SEV

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Message-ID: <gb6pm7leba4ayhh2f6wjirq4ytmemadqeij6cbnak6r22e3c5b@uyakvi62fqfd>
Date: Thu, 19 Jun 2025 08:52:18 +0300
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: Zack Rusin <zack.rusin@...adcom.com>
Cc: dri-devel@...ts.freedesktop.org, 
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, ian.forbes@...adcom.com, martin.krastev@...adcom.com, 
	maaz.mombasawala@...adcom.com, Marko Kiiskila <marko.kiiskila@...adcom.com>, 
	Ingo Molnar <mingo@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, Linus Torvalds <torvalds@...ux-foundation.org>, 
	Peter Zijlstra <peterz@...radead.org>, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/vmwgfx: Fix guests running with TDX/SEV

On Wed, Jun 18, 2025 at 03:29:26PM -0400, Zack Rusin wrote:
> From: Marko Kiiskila <marko.kiiskila@...adcom.com>
> 
> 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@...adcom.com>
> Signed-off-by: Zack Rusin <zack.rusin@...adcom.com>
> Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: linux-mm@...ck.org
> Cc: linux-kernel@...r.kernel.org

Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

-- 
  Kiryl Shutsemau / Kirill A. Shutemov