linux-kernel - [tip:x86/mm] xen/x86: Remove SME feature in PV guests

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Date:   Tue, 18 Jul 2017 03:58:59 -0700
From:   tip-bot for Tom Lendacky <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     toshi.kani@....com, riel@...hat.com, bp@...e.de, glider@...gle.com,
        rkrcmar@...hat.com, matt@...eblueprint.co.uk, mingo@...nel.org,
        hpa@...or.com, konrad.wilk@...cle.com, xen-devel@...ts.xen.org,
        brijesh.singh@....com, boris.ostrovsky@...cle.com, mst@...hat.com,
        tglx@...utronix.de, bp@...en8.de, torvalds@...ux-foundation.org,
        jgross@...e.com, peterz@...radead.org, pbonzini@...hat.com,
        dyoung@...hat.com, arnd@...db.de, corbet@....net,
        linux-kernel@...r.kernel.org, dvyukov@...gle.com,
        aryabinin@...tuozzo.com, lwoodman@...hat.com,
        thomas.lendacky@....com, luto@...nel.org
Subject: [tip:x86/mm] xen/x86: Remove SME feature in PV guests

Commit-ID:  f2f931c6819467af5260a21c59fb787ce2863f92
Gitweb:     http://git.kernel.org/tip/f2f931c6819467af5260a21c59fb787ce2863f92
Author:     Tom Lendacky <thomas.lendacky@....com>
AuthorDate: Mon, 17 Jul 2017 16:10:29 -0500
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 18 Jul 2017 11:38:05 +0200

xen/x86: Remove SME feature in PV guests

Xen does not currently support SME for PV guests. Clear the SME CPU
capability in order to avoid any ambiguity.

Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
Reviewed-by: Borislav Petkov <bp@...e.de>
Reviewed-by: Juergen Gross <jgross@...e.com>
Cc: <xen-devel@...ts.xen.org>
Cc: Alexander Potapenko <glider@...gle.com>
Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Brijesh Singh <brijesh.singh@....com>
Cc: Dave Young <dyoung@...hat.com>
Cc: Dmitry Vyukov <dvyukov@...gle.com>
Cc: Jonathan Corbet <corbet@....net>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Larry Woodman <lwoodman@...hat.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Matt Fleming <matt@...eblueprint.co.uk>
Cc: Michael S. Tsirkin <mst@...hat.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Radim Krčmář <rkrcmar@...hat.com>
Cc: Rik van Riel <riel@...hat.com>
Cc: Toshimitsu Kani <toshi.kani@....com>
Cc: kasan-dev@...glegroups.com
Cc: kvm@...r.kernel.org
Cc: linux-arch@...r.kernel.org
Cc: linux-doc@...r.kernel.org
Cc: linux-efi@...r.kernel.org
Cc: linux-mm@...ck.org
Link: http://lkml.kernel.org/r/3b605622a9fae5e588e5a13967120a18ec18071b.1500319216.git.thomas.lendacky@amd.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/xen/enlighten_pv.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 290bc5a..df19217 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -263,6 +263,7 @@ static void __init xen_init_capabilities(void)
 	setup_clear_cpu_cap(X86_FEATURE_MTRR);
 	setup_clear_cpu_cap(X86_FEATURE_ACC);
 	setup_clear_cpu_cap(X86_FEATURE_X2APIC);
+	setup_clear_cpu_cap(X86_FEATURE_SME);
 
 	/*
 	 * Xen PV would need some work to support PCID: CR3 handling as well