2018-01-15 14:26:15 +03:00
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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2018-01-06 17:13:39 +03:00
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From: Tom Lendacky <thomas.lendacky@amd.com>
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Date: Mon, 17 Jul 2017 16:10:29 -0500
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2018-01-15 14:26:15 +03:00
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Subject: [PATCH] xen/x86: Remove SME feature in PV guests
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2018-01-06 17:13:39 +03:00
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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CVE-2017-5754
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Xen does not currently support SME for PV guests. Clear the SME CPU
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capability in order to avoid any ambiguity.
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Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
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Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
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Reviewed-by: Borislav Petkov <bp@suse.de>
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Reviewed-by: Juergen Gross <jgross@suse.com>
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Cc: <xen-devel@lists.xen.org>
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Cc: Alexander Potapenko <glider@google.com>
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Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
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Cc: Andy Lutomirski <luto@kernel.org>
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Cc: Arnd Bergmann <arnd@arndb.de>
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Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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Cc: Borislav Petkov <bp@alien8.de>
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Cc: Brijesh Singh <brijesh.singh@amd.com>
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Cc: Dave Young <dyoung@redhat.com>
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Cc: Dmitry Vyukov <dvyukov@google.com>
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Cc: Jonathan Corbet <corbet@lwn.net>
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Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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Cc: Larry Woodman <lwoodman@redhat.com>
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Cc: Linus Torvalds <torvalds@linux-foundation.org>
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Cc: Matt Fleming <matt@codeblueprint.co.uk>
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Cc: Michael S. Tsirkin <mst@redhat.com>
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Cc: Paolo Bonzini <pbonzini@redhat.com>
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Cc: Peter Zijlstra <peterz@infradead.org>
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Cc: Radim Krčmář <rkrcmar@redhat.com>
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Cc: Rik van Riel <riel@redhat.com>
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Cc: Toshimitsu Kani <toshi.kani@hpe.com>
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Cc: kasan-dev@googlegroups.com
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Cc: kvm@vger.kernel.org
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Cc: linux-arch@vger.kernel.org
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Cc: linux-doc@vger.kernel.org
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Cc: linux-efi@vger.kernel.org
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Cc: linux-mm@kvack.org
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Link: http://lkml.kernel.org/r/3b605622a9fae5e588e5a13967120a18ec18071b.1500319216.git.thomas.lendacky@amd.com
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Signed-off-by: Ingo Molnar <mingo@kernel.org>
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(cherry picked from commit f2f931c6819467af5260a21c59fb787ce2863f92)
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Signed-off-by: Andy Whitcroft <apw@canonical.com>
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Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
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(cherry picked from commit 8370907399392a637a2e51b4db3368fb594db3a6)
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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arch/x86/xen/enlighten_pv.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
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index 290bc5ac9852..df1921751aa5 100644
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--- a/arch/x86/xen/enlighten_pv.c
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+++ b/arch/x86/xen/enlighten_pv.c
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@@ -263,6 +263,7 @@ static void __init xen_init_capabilities(void)
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setup_clear_cpu_cap(X86_FEATURE_MTRR);
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setup_clear_cpu_cap(X86_FEATURE_ACC);
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setup_clear_cpu_cap(X86_FEATURE_X2APIC);
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+ setup_clear_cpu_cap(X86_FEATURE_SME);
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/*
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* Xen PV would need some work to support PCID: CR3 handling as well
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--
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2.14.2
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