linux-kernel - [Part1 PATCH v5.1 06/17] x86/mm: Include SEV for encryption memory attribute changes

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Message-Id: <20170927191702.72075-1-brijesh.singh@amd.com>
Date:   Wed, 27 Sep 2017 14:17:02 -0500
From:   Brijesh Singh <brijesh.singh@....com>
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org, x86@...nel.org
Cc:     Tom Lendacky <thomas.lendacky@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...e.de>,
        Andy Lutomirski <luto@...nel.org>,
        John Ogness <john.ogness@...utronix.de>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Laura Abbott <labbott@...hat.com>,
        Dan Williams <dan.j.williams@...el.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Brijesh Singh <brijesh.singh@....com>
Subject: [Part1 PATCH v5.1 06/17] x86/mm: Include SEV for encryption memory attribute changes

From: Tom Lendacky <thomas.lendacky@....com>

The current code checks only for sme_active() when determining whether
to perform the encryption attribute change.  Include sev_active() in this
check so that memory attribute changes can occur under SME and SEV.

Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: John Ogness <john.ogness@...utronix.de>
Cc: Matt Fleming <matt@...eblueprint.co.uk>
Cc: Laura Abbott <labbott@...hat.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org
Cc: x86@...nel.org
Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
Signed-off-by: Brijesh Singh <brijesh.singh@....com>
Reviewed-by: Borislav Petkov <bp@...e.de>
---
 arch/x86/mm/pageattr.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index dfb7d657cf43..3fe68483463c 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -1781,8 +1781,8 @@ static int __set_memory_enc_dec(unsigned long addr, int numpages, bool enc)
 	unsigned long start;
 	int ret;
 
-	/* Nothing to do if the SME is not active */
-	if (!sme_active())
+	/* Nothing to do if memory encryption is not active */
+	if (!mem_encrypt_active())
 		return 0;
 
 	/* Should not be working on unaligned addresses */
-- 
2.9.5