From: Tom Lendacky <thomas.lendacky@xxxxxxx>
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.lendacky@xxxxxxx>
---
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);
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