linux-kernel - Re: [PATCH v6 08/10] x86/smpwakeup: Add a helper get the address of the wakeup mailbox

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Message-ID: <20251017221620.GD614927@liuwe-devbox-debian-v2.local>
Date: Fri, 17 Oct 2025 22:16:20 +0000
From: Wei Liu <wei.liu@...nel.org>
To: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
Cc: x86@...nel.org, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Rob Herring <robh@...nel.org>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
	Michael Kelley <mhklinux@...look.com>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Saurabh Sengar <ssengar@...ux.microsoft.com>,
	Chris Oo <cho@...rosoft.com>, "Kirill A. Shutemov" <kas@...nel.org>,
	linux-hyperv@...r.kernel.org, devicetree@...r.kernel.org,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Ricardo Neri <ricardo.neri@...el.com>
Subject: Re: [PATCH v6 08/10] x86/smpwakeup: Add a helper get the address of
 the wakeup mailbox

On Thu, Oct 16, 2025 at 07:57:30PM -0700, Ricardo Neri wrote:
> A Hyper-V VTL level 2 guest in a TDX environment needs to map the physical
> page of the ACPI Multiprocessor Wakeup Structure as private (encrypted). It
> needs to know the physical address of this structure. Add a helper function
> to retrieve the address.
> 
> Reviewed-by: Dexuan Cui <decui@...rosoft.com>
> Reviewed-by: Michael Kelley <mhklinux@...look.com>
> Suggested-by: Michael Kelley <mhklinux@...look.com>
> Signed-off-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>

Can I get an Ack from x86 maintainers?

> ---
> Changes since v5:
>  - Added Reviewed-by tag from Dexuan. Thanks!
> 
> Changes since v4:
>  - None
> 
> Changes since v3:
>  - Renamed function to acpi_get_mp_wakeup_mailbox_paddr().
>  - Added Reviewed-by tag from Michael. Thanks!
> 
> Changes since v2:
>  - Introduced this patch
> 
> Changes since v1:
>  - N/A
> ---
>  arch/x86/include/asm/smp.h  | 1 +
>  arch/x86/kernel/smpwakeup.c | 5 +++++
>  2 files changed, 6 insertions(+)
> 
> diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h
> index 47ac4381a805..71de1963f984 100644
> --- a/arch/x86/include/asm/smp.h
> +++ b/arch/x86/include/asm/smp.h
> @@ -151,6 +151,7 @@ static inline struct cpumask *cpu_l2c_shared_mask(int cpu)
>  
>  void acpi_setup_mp_wakeup_mailbox(u64 addr);
>  struct acpi_madt_multiproc_wakeup_mailbox *acpi_get_mp_wakeup_mailbox(void);
> +u64 acpi_get_mp_wakeup_mailbox_paddr(void);
>  
>  #else /* !CONFIG_SMP */
>  #define wbinvd_on_cpu(cpu)     wbinvd()
> diff --git a/arch/x86/kernel/smpwakeup.c b/arch/x86/kernel/smpwakeup.c
> index 5089bcda615d..f730a66b6fc8 100644
> --- a/arch/x86/kernel/smpwakeup.c
> +++ b/arch/x86/kernel/smpwakeup.c
> @@ -81,3 +81,8 @@ struct acpi_madt_multiproc_wakeup_mailbox *acpi_get_mp_wakeup_mailbox(void)
>  {
>  	return acpi_mp_wake_mailbox;
>  }
> +
> +u64 acpi_get_mp_wakeup_mailbox_paddr(void)
> +{
> +	return acpi_mp_wake_mailbox_paddr;
> +}
> 
> -- 
> 2.43.0
>