| From | Brijesh Singh <> | Subject | [RFC Part1 PATCH v3 05/17] x86, realmode: Don't decrypt trampoline area under SEV | Date | Mon, 24 Jul 2017 14:07:45 -0500 |
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From: Tom Lendacky <thomas.lendacky@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@amd.com> Signed-off-by: Brijesh Singh <brijesh.singh@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 --- a/arch/x86/realmode/init.c +++ b/arch/x86/realmode/init.c @@ -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); -- 2.9.4
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