linux-kernel - [PATCH v2 4/9] x86/hyperv: Parse the ACPI wakeup mailbox

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Message-Id: <20240823232327.2408869-5-yunhong.jiang@linux.intel.com>
Date: Fri, 23 Aug 2024 16:23:22 -0700
From: Yunhong Jiang <yunhong.jiang@...ux.intel.com>
To: tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	x86@...nel.org,
	hpa@...or.com,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	kys@...rosoft.com,
	haiyangz@...rosoft.com,
	wei.liu@...nel.org,
	decui@...rosoft.com,
	rafael@...nel.org,
	lenb@...nel.org,
	kirill.shutemov@...ux.intel.com,
	yunhong.jiang@...ux.intel.com
Cc: linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-hyperv@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: [PATCH v2 4/9] x86/hyperv: Parse the ACPI wakeup mailbox

Parse the wakeup mailbox VTL2 TDX guest. Put it to the guest_late_init, so
that it will be invoked before hyperv_init() where the mailbox address is
checked.

Signed-off-by: Yunhong Jiang <yunhong.jiang@...ux.intel.com>
---
 arch/x86/include/asm/mshyperv.h | 3 +++
 arch/x86/kernel/cpu/mshyperv.c  | 2 ++
 drivers/hv/hv_common.c          | 8 ++++++++
 3 files changed, 13 insertions(+)

diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index 390c4d13956d..5178b96c7fc9 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -10,6 +10,7 @@
 #include <asm/nospec-branch.h>
 #include <asm/paravirt.h>
 #include <asm/mshyperv.h>
+#include <asm/madt_wakeup.h>
 
 /*
  * Hyper-V always provides a single IO-APIC at this MMIO address.
@@ -49,6 +50,8 @@ extern u64 hv_current_partition_id;
 
 extern union hv_ghcb * __percpu *hv_ghcb_pg;
 
+extern u64 wakeup_mailbox_addr;
+
 bool hv_isolation_type_snp(void);
 bool hv_isolation_type_tdx(void);
 u64 hv_tdx_hypercall(u64 control, u64 param1, u64 param2);
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index 3d4237f27569..f6b727b4bd0b 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -43,6 +43,8 @@ struct ms_hyperv_info ms_hyperv;
 bool hyperv_paravisor_present __ro_after_init;
 EXPORT_SYMBOL_GPL(hyperv_paravisor_present);
 
+u64 wakeup_mailbox_addr;
+
 #if IS_ENABLED(CONFIG_HYPERV)
 static inline unsigned int hv_get_nested_msr(unsigned int reg)
 {
diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c
index 9c452bfbd571..14b005b6270f 100644
--- a/drivers/hv/hv_common.c
+++ b/drivers/hv/hv_common.c
@@ -365,6 +365,14 @@ void __init ms_hyperv_late_init(void)
 	u8 *randomdata;
 	u32 length, i;
 
+	/*
+	 * Parse the ACPI wakeup structure information from device tree.
+	 * Currently VTL2 TDX guest only.
+	 */
+#ifdef CONFIG_X86_64
+	wakeup_mailbox_addr = dtb_parse_mp_wake();
+#endif
+
 	/*
 	 * Seed the Linux random number generator with entropy provided by
 	 * the Hyper-V host in ACPI table OEM0.
-- 
2.25.1