[RFC Part1 PATCH v3 05/17] x86, realmode: Don't decrypt trampoline area under SEV
brijesh.singh at amd.com
Tue Jul 25 05:07:45 AEST 2017
From: Tom Lendacky <thomas.lendacky at amd.com>
When SEV is active the trampoline area will need to be in encrypted
memory so only mark the area decrypted if SME is active.
Signed-off-by: Tom Lendacky <thomas.lendacky at amd.com>
Signed-off-by: Brijesh Singh <brijesh.singh at amd.com>
arch/x86/realmode/init.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c
index 1f71980..c7eeca7 100644
@@ -63,9 +63,11 @@ static void __init setup_real_mode(void)
* If SME is active, the trampoline area will need to be in
* decrypted memory in order to bring up other processors
- * successfully.
+ * successfully. For SEV the trampoline area needs to be in
+ * encrypted memory, so only do this for SME.
- set_memory_decrypted((unsigned long)base, size >> PAGE_SHIFT);
+ if (sme_active())
+ set_memory_decrypted((unsigned long)base, size >> PAGE_SHIFT);
memcpy(base, real_mode_blob, size);
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