linux-kernel - RE: [EXTERNAL] [PATCH v5 09/10] x86/hyperv/vtl: Mark the wakeup mailbox page as private

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Message-ID:
 <DS3PR21MB58782125C2F0EF520E6983D9BF08A@DS3PR21MB5878.namprd21.prod.outlook.com>
Date: Fri, 12 Sep 2025 20:47:15 +0000
From: Dexuan Cui <decui@...rosoft.com>
To: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>, "x86@...nel.org"
	<x86@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
	<conor+dt@...nel.org>, Rob Herring <robh@...nel.org>, KY Srinivasan
	<kys@...rosoft.com>, Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu
	<wei.liu@...nel.org>, Michael Kelley <mhklinux@...look.com>, "Rafael J.
 Wysocki" <rafael@...nel.org>
CC: "ssengar@...ux.microsoft.com" <ssengar@...ux.microsoft.com>, Chris Oo
	<cho@...rosoft.com>, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	"linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Ricardo Neri
	<ricardo.neri@...el.com>, Yunhong Jiang <yunhong.jiang@...ux.intel.com>
Subject: RE: [EXTERNAL] [PATCH v5 09/10] x86/hyperv/vtl: Mark the wakeup
 mailbox page as private

> From: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
> Sent: Friday, June 27, 2025 8:35 PM
> [...]
> 
> From: Yunhong Jiang <yunhong.jiang@...ux.intel.com>
> 
> The current code maps MMIO devices as shared (decrypted) by default in a
> confidential computing VM.
> 
> In a TDX environment, secondary CPUs are booted using the Multiprocessor
> Wakeup Structure defined in the ACPI specification. The virtual firmware
> and the operating system function in the guest context, without
> intervention from the VMM. Map the physical memory of the mailbox as
> private. Use the is_private_mmio() callback.
> 
> Reviewed-by: Michael Kelley <mhklinux@...look.com>
> Signed-off-by: Yunhong Jiang <yunhong.jiang@...ux.intel.com>
> Signed-off-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
> ---

LGTM

Reviewed-by: Dexuan Cui <decui@...rosoft.com>