Messages in this thread Patch in this message | | | Date | Tue, 7 Nov 2017 06:44:05 -0800 | From | tip-bot for Tom Lendacky <> | Subject | [tip:x86/asm] x86/realmode: Don't decrypt trampoline area under SEV |
| |
Commit-ID: fcdcd6cdd98ff4d0cf876f863024a2fb0b491d41 Gitweb: https://git.kernel.org/tip/fcdcd6cdd98ff4d0cf876f863024a2fb0b491d41 Author: Tom Lendacky <thomas.lendacky@amd.com> AuthorDate: Fri, 20 Oct 2017 09:30:46 -0500 Committer: Thomas Gleixner <tglx@linutronix.de> CommitDate: Tue, 7 Nov 2017 15:35:55 +0100
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 <thomas.lendacky@amd.com> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Borislav Petkov <bp@suse.de> Tested-by: Borislav Petkov <bp@suse.de> Cc: Laura Abbott <labbott@redhat.com> Cc: kvm@vger.kernel.org Cc: Borislav Petkov <bp@alien8.de> Cc: Andy Lutomirski <luto@kernel.org> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Link: https://lkml.kernel.org/r/20171020143059.3291-5-brijesh.singh@amd.com
--- arch/x86/realmode/init.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c index ed84d39..d101058 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);
| |