linux-kernel - [PATCH] sev-snp: parse MP tables for VMware hypervisor

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Message-Id: <20241219114400.858980-1-ajay.kaher@broadcom.com>
Date: Thu, 19 Dec 2024 11:44:00 +0000
From: Ajay Kaher <ajay.kaher@...adcom.com>
To: kevinloughlin@...gle.com,
	bp@...en8.de
Cc: bcm-kernel-feedback-list@...adcom.com,
	tglx@...utronix.de,
	mingo@...hat.com,
	dave.hansen@...ux.intel.com,
	x86@...nel.org,
	hpa@...or.com,
	virtualization@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	ajay.kaher@...adcom.com,
	ye.li@...adcom.com,
	bo.gan@...adcom.com,
	vamsi-krishna.brahmajosyula@...adcom.com,
	alexey.makhalov@...adcom.com,
	vasavi.sirnapalli@...adcom.com,
	florian.fainelli@...adcom.com
Subject: [PATCH] sev-snp: parse MP tables for VMware hypervisor

For VMware hypervisor, SEV-SNP enabled VM's could boot without UEFI.
In this case, mpparse_find_mptable() has to be called to parse MP
tables which contains boot information.

Fixes: 0f4a1e80989a ("x86/sev: Skip ROM range scans and validation for SEV-SNP guests")
Signed-off-by: Ajay Kaher <ajay.kaher@...adcom.com>
Signed-off-by: Ye Li <ye.li@...adcom.com>
Tested-by: Ye Li <ye.li@...adcom.com>
---
 arch/x86/kernel/cpu/vmware.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c
index 00189cd..3e2594d 100644
--- a/arch/x86/kernel/cpu/vmware.c
+++ b/arch/x86/kernel/cpu/vmware.c
@@ -26,6 +26,7 @@
 #include <linux/export.h>
 #include <linux/clocksource.h>
 #include <linux/cpu.h>
+#include <linux/efi.h>
 #include <linux/reboot.h>
 #include <linux/static_call.h>
 #include <asm/div64.h>
@@ -35,6 +36,8 @@
 #include <asm/apic.h>
 #include <asm/vmware.h>
 #include <asm/svm.h>
+#include <asm/mem_encrypt.h>
+#include <asm/efi.h>
 
 #undef pr_fmt
 #define pr_fmt(fmt)	"vmware: " fmt
@@ -429,6 +432,10 @@ static void __init vmware_platform_setup(void)
 		pr_warn("Failed to get TSC freq from the hypervisor\n");
 	}
 
+	if (sev_status & MSR_AMD64_SEV_SNP_ENABLED &&
+	    !efi_enabled(EFI_BOOT))
+		x86_init.mpparse.find_mptable = mpparse_find_mptable;
+
 	vmware_paravirt_ops_setup();
 
 #ifdef CONFIG_X86_IO_APIC
-- 
2.39.4