Commit a2ab2552 authored by Ajay Kaher's avatar Ajay Kaher Committed by Ingo Molnar
Browse files

x86/vmware: Parse MP tables for SEV-SNP enabled guests under VMware hypervisors 



Under VMware hypervisors, SEV-SNP enabled VMs are fundamentally able to boot
without UEFI, but this regressed a year ago due to:

  0f4a1e80 ("x86/sev: Skip ROM range scans and validation for SEV-SNP guests")

In this case, mpparse_find_mptable() has to be called to parse MP
tables which contains the necessary boot information.

[ mingo: Updated the changelog. ]

Fixes: 0f4a1e80 ("x86/sev: Skip ROM range scans and validation for SEV-SNP guests")
Co-developed-by: default avatarYe Li <ye.li@broadcom.com>
Signed-off-by: default avatarYe Li <ye.li@broadcom.com>
Signed-off-by: default avatarAjay Kaher <ajay.kaher@broadcom.com>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
Tested-by: default avatarYe Li <ye.li@broadcom.com>
Reviewed-by: default avatarKevin Loughlin <kevinloughlin@google.com>
Acked-by: default avatarBorislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20250313173111.10918-1-ajay.kaher@broadcom.com
parent b7f94fcf

arch/x86/kernel/cpu/vmware.c

+4 −0
Original line number Diff line number Diff line
@@ -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>
@@ -429,6 +430,9 @@ static void __init vmware_platform_setup(void) 
		pr_warn("Failed to get TSC freq from the hypervisor\n");

	}



	if (cc_platform_has(CC_ATTR_GUEST_SEV_SNP) && !efi_enabled(EFI_BOOT))

		x86_init.mpparse.find_mptable = mpparse_find_mptable;



	vmware_paravirt_ops_setup();



#ifdef CONFIG_X86_IO_APIC