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authorTom Lendacky <[email protected]>2017-10-20 09:30:46 -0500
committerThomas Gleixner <[email protected]>2017-11-07 15:35:55 +0100
commitfcdcd6cdd98ff4d0cf876f863024a2fb0b491d41 (patch)
treeecfda2a3cec17141dccb467a026bf529e6aebd24 /arch/x86/realmode/init.c
parent682af54399b6111730aec0be63e5f6a3a3359a76 (diff)
x86/realmode: Don't decrypt trampoline area under SEV
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 <[email protected]> Signed-off-by: Brijesh Singh <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Reviewed-by: Borislav Petkov <[email protected]> Tested-by: Borislav Petkov <[email protected]> Cc: Laura Abbott <[email protected]> Cc: [email protected] Cc: Borislav Petkov <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: "Kirill A. Shutemov" <[email protected]> Link: https://lkml.kernel.org/r/[email protected]
Diffstat (limited to 'arch/x86/realmode/init.c')
-rw-r--r--arch/x86/realmode/init.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c
index ed84d3917a59..d10105825d57 100644
--- a/arch/x86/realmode/init.c
+++ b/arch/x86/realmode/init.c
@@ -64,9 +64,10 @@ 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. This is not needed for SEV.
*/
- 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);