linux-kernel - RE: [PATCH v3 11/13] x86/smpboot: Add a helper get the address of the wakeup mailbox

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Message-ID:
 <SN6PR02MB415791B34FC2FF98CBA4B2CED49FA@SN6PR02MB4157.namprd02.prod.outlook.com>
Date: Tue, 20 May 2025 01:32:46 +0000
From: Michael Kelley <mhklinux@...look.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>, "K. Y. Srinivasan"
	<kys@...rosoft.com>, Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu
	<wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>
CC: "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>, Saurabh Sengar
	<ssengar@...ux.microsoft.com>, Chris Oo <cho@...rosoft.com>,
	"linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>, "Kirill A.
 Shutemov" <kirill.shutemov@...ux.intel.com>, "linux-acpi@...r.kernel.org"
	<linux-acpi@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
	Ricardo Neri <ricardo.neri@...el.com>
Subject: RE: [PATCH v3 11/13] x86/smpboot: Add a helper get the address of the
 wakeup mailbox

From: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com> Sent: Saturday, May 3, 2025 12:15 PM
> 
> A Hyper-V VTL level 2 guest on 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.
> 
> Suggested-by: Michael Kelley <mhklinux@...look.com>
> Signed-off-by: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
> ---
> Changes since v2:
>  - Introduced this patch
> 
> Changes since v1:
>  - N/A
> ---
>  arch/x86/include/asm/smp.h | 1 +
>  arch/x86/kernel/smpboot.c  | 5 +++++
>  2 files changed, 6 insertions(+)
> 
> diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h
> index 97bfbd0d24d4..18003453569a 100644
> --- a/arch/x86/include/asm/smp.h
> +++ b/arch/x86/include/asm/smp.h
> @@ -149,6 +149,7 @@ static inline struct cpumask *cpu_l2c_shared_mask(int cpu)
>  #ifdef CONFIG_X86_64
>  void setup_mp_wakeup_mailbox(u64 addr);
>  struct acpi_madt_multiproc_wakeup_mailbox *get_mp_wakeup_mailbox(void);
> +u64 get_mp_wakeup_mailbox_paddr(void);
>  #endif
> 
>  #else /* !CONFIG_SMP */
> diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
> index 6f39ebe4d192..1e211c78c1d3 100644
> --- a/arch/x86/kernel/smpboot.c
> +++ b/arch/x86/kernel/smpboot.c
> @@ -1431,4 +1431,9 @@ struct acpi_madt_multiproc_wakeup_mailbox
> *get_mp_wakeup_mailbox(void)
>  {
>  	return acpi_mp_wake_mailbox;
>  }
> +
> +u64 get_mp_wakeup_mailbox_paddr(void)
> +{
> +	return acpi_mp_wake_mailbox_paddr;
> +}
>  #endif
> --
> 2.43.0

Reviewed-by: Michael Kelley <mhklinux@...look.com>