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

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Message-Id: <20250503191515.24041-12-ricardo.neri-calderon@linux.intel.com>
Date: Sat,  3 May 2025 12:15:13 -0700
From: Ricardo Neri <ricardo.neri-calderon@...ux.intel.com>
To: 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>
Cc: devicetree@...r.kernel.org,
	Saurabh Sengar <ssengar@...ux.microsoft.com>,
	Chris Oo <cho@...rosoft.com>,
	linux-hyperv@...r.kernel.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	linux-acpi@...r.kernel.org ,
	linux-kernel@...r.kernel.org,
	"Ravi V. Shankar" <ravi.v.shankar@...el.com>,
	Ricardo Neri <ricardo.neri@...el.com>
Subject: [PATCH v3 11/13] x86/smpboot: Add a helper get the address of the wakeup mailbox

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