From: Tom Lendacky <thomas.lenda...@amd.com> When Secure Encrypted Virtualization is active instruction fetches are always interpreted as being from encrypted memory so the trampoline area must remain encrypted when SEV is active.
Signed-off-by: Tom Lendacky <thomas.lenda...@amd.com> --- arch/x86/realmode/init.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c index c3edb49..f3207e5 100644 --- a/arch/x86/realmode/init.c +++ b/arch/x86/realmode/init.c @@ -138,10 +138,13 @@ static void __init set_real_mode_permissions(void) /* * If memory encryption is active, the trampoline area will need to * be in non-encrypted memory in order to bring up other processors - * successfully. + * successfully. This only applies to SME, SEV requires the trampoline + * to be encrypted. */ - sme_early_mem_dec(__pa(base), size); - sme_set_mem_dec(base, size); + if (!sev_active) { + sme_early_mem_dec(__pa(base), size); + sme_set_mem_dec(base, size); + } set_memory_nx((unsigned long) base, size >> PAGE_SHIFT); set_memory_ro((unsigned long) base, ro_size >> PAGE_SHIFT); -- To unsubscribe from this list: send the line "unsubscribe linux-crypto" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html