From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brijesh Singh Subject: [Part1 PATCH v4 04/17] x86/realmode: Don't decrypt trampoline area under SEV Date: Sat, 16 Sep 2017 07:34:05 -0500 Message-ID: <20170916123418.37807-5-brijesh.singh@amd.com> References: <20170916123418.37807-1-brijesh.singh@amd.com> Mime-Version: 1.0 Content-Type: text/plain Cc: Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" , Borislav Petkov , Andy Lutomirski , Tom Lendacky , Laura Abbott , "Kirill A. Shutemov" , Brijesh Singh To: linux-kernel@vger.kernel.org, x86@kernel.org, kvm@vger.kernel.org Return-path: In-Reply-To: <20170916123418.37807-1-brijesh.singh@amd.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org From: Tom Lendacky When SEV is active the trampoline area will need to be in encrypted memory so only mark the area decrypted if SME is active. Cc: Thomas Gleixner Cc: Ingo Molnar Cc: "H. Peter Anvin" Cc: Borislav Petkov Cc: Andy Lutomirski Cc: Laura Abbott Cc: "Kirill A. Shutemov" Cc: linux-kernel@vger.kernel.org Cc: x86@kernel.org Signed-off-by: Tom Lendacky Signed-off-by: Brijesh Singh --- 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 1f71980fc5e0..d03125c2b73b 100644 --- a/arch/x86/realmode/init.c +++ b/arch/x86/realmode/init.c @@ -63,9 +63,10 @@ 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); -- 2.9.5