From: Vasant Karasulli vkarasulli@suse.de
Unlike SEV-ES, AP jump table technique is not used in SEV-SNP when transitioning from one layer of code to another (e.g. when going from UEFI to the OS).
Signed-off-by: Vasant Karasulli vkarasulli@suse.de --- arch/x86/kernel/sev.c | 6 +++++- arch/x86/realmode/init.c | 5 +++-- 2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c index e64320507da2..a9cf74512269 100644 --- a/arch/x86/kernel/sev.c +++ b/arch/x86/kernel/sev.c @@ -1392,7 +1392,8 @@ STACK_FRAME_NON_STANDARD(sev_jumptable_ap_park); void sev_es_stop_this_cpu(void) { if (!(cc_vendor == CC_VENDOR_AMD) || - !cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT)) + !cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT) || + cc_platform_has(CC_ATTR_GUEST_SEV_SNP)) return;
/* Only park in the AP jump table when the code has been installed */ @@ -1468,6 +1469,9 @@ bool sev_kexec_supported(void) if (!cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT)) return true;
+ if (cc_platform_has(CC_ATTR_GUEST_SEV_SNP)) + return false; + /* * KEXEC with SEV-ES and more than one CPU is only supported * when the AP jump table is installed. diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c index f9bc444a3064..ed798939be5d 100644 --- a/arch/x86/realmode/init.c +++ b/arch/x86/realmode/init.c @@ -80,8 +80,9 @@ static void __init sme_sev_setup_real_mode(struct trampoline_header *th) */ th->start = (u64) secondary_startup_64_no_verify;
- if (sev_es_setup_ap_jump_table(real_mode_header)) - panic("Failed to get/update SEV-ES AP Jump Table"); + if (!cc_platform_has(CC_ATTR_GUEST_SEV_SNP)) + if (sev_es_setup_ap_jump_table(real_mode_header)) + panic("Failed to get/update SEV-ES AP Jump Table"); } #endif }