6.12-stable review patch. If anyone has any objections, please let me know.
------------------
From: Ajay Kaher <ajay.kaher@xxxxxxxxxxxx>
[ Upstream commit a2ab25529bbcea51b5e01dded79f45aeb94f644a ]
Under VMware hypervisors, SEV-SNP enabled VMs are fundamentally able to boot
without UEFI, but this regressed a year ago due to:
0f4a1e80989a ("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: 0f4a1e80989a ("x86/sev: Skip ROM range scans and validation for SEV-SNP guests")
Co-developed-by: Ye Li <ye.li@xxxxxxxxxxxx>
Signed-off-by: Ye Li <ye.li@xxxxxxxxxxxx>
Signed-off-by: Ajay Kaher <ajay.kaher@xxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Tested-by: Ye Li <ye.li@xxxxxxxxxxxx>
Reviewed-by: Kevin Loughlin <kevinloughlin@xxxxxxxxxx>
Acked-by: Borislav Petkov (AMD) <bp@xxxxxxxxx>
Link: https://lore.kernel.org/r/20250313173111.10918-1-ajay.kaher@xxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
arch/x86/kernel/cpu/vmware.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c
index 00189cdeb775f..cb3f900c46fcc 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>
@@ -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
--
2.39.5
