patches/kernel/0021-xen-x86-Remove-SME-feature-in-PV-guests.patch

   1 From aa2a95a84f2cbd92b10887f3c99c7858fae9e7e4 Mon Sep 17 00:00:00 2001
   2 From: Tom Lendacky <thomas.lendacky@amd.com>
   3 Date: Mon, 17 Jul 2017 16:10:29 -0500
   4 Subject: [PATCH 021/241] xen/x86: Remove SME feature in PV guests
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 CVE-2017-5754
  10
  11 Xen does not currently support SME for PV guests. Clear the SME CPU
  12 capability in order to avoid any ambiguity.
  13
  14 Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
  15 Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
  16 Reviewed-by: Borislav Petkov <bp@suse.de>
  17 Reviewed-by: Juergen Gross <jgross@suse.com>
  18 Cc: <xen-devel@lists.xen.org>
  19 Cc: Alexander Potapenko <glider@google.com>
  20 Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
  21 Cc: Andy Lutomirski <luto@kernel.org>
  22 Cc: Arnd Bergmann <arnd@arndb.de>
  23 Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
  24 Cc: Borislav Petkov <bp@alien8.de>
  25 Cc: Brijesh Singh <brijesh.singh@amd.com>
  26 Cc: Dave Young <dyoung@redhat.com>
  27 Cc: Dmitry Vyukov <dvyukov@google.com>
  28 Cc: Jonathan Corbet <corbet@lwn.net>
  29 Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
  30 Cc: Larry Woodman <lwoodman@redhat.com>
  31 Cc: Linus Torvalds <torvalds@linux-foundation.org>
  32 Cc: Matt Fleming <matt@codeblueprint.co.uk>
  33 Cc: Michael S. Tsirkin <mst@redhat.com>
  34 Cc: Paolo Bonzini <pbonzini@redhat.com>
  35 Cc: Peter Zijlstra <peterz@infradead.org>
  36 Cc: Radim Krčmář <rkrcmar@redhat.com>
  37 Cc: Rik van Riel <riel@redhat.com>
  38 Cc: Toshimitsu Kani <toshi.kani@hpe.com>
  39 Cc: kasan-dev@googlegroups.com
  40 Cc: kvm@vger.kernel.org
  41 Cc: linux-arch@vger.kernel.org
  42 Cc: linux-doc@vger.kernel.org
  43 Cc: linux-efi@vger.kernel.org
  44 Cc: linux-mm@kvack.org
  45 Link: http://lkml.kernel.org/r/3b605622a9fae5e588e5a13967120a18ec18071b.1500319216.git.thomas.lendacky@amd.com
  46 Signed-off-by: Ingo Molnar <mingo@kernel.org>
  47 (cherry picked from commit f2f931c6819467af5260a21c59fb787ce2863f92)
  48 Signed-off-by: Andy Whitcroft <apw@canonical.com>
  49 Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
  50 (cherry picked from commit 8370907399392a637a2e51b4db3368fb594db3a6)
  51 Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
  52 ---
  53  arch/x86/xen/enlighten_pv.c | 1 +
  54  1 file changed, 1 insertion(+)
  55
  56 diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
  57 index 290bc5ac9852..df1921751aa5 100644
  58 --- a/arch/x86/xen/enlighten_pv.c
  59 +++ b/arch/x86/xen/enlighten_pv.c
  60 @@ -263,6 +263,7 @@ static void __init xen_init_capabilities(void)
  61         setup_clear_cpu_cap(X86_FEATURE_MTRR);
  62         setup_clear_cpu_cap(X86_FEATURE_ACC);
  63         setup_clear_cpu_cap(X86_FEATURE_X2APIC);
  64 +       setup_clear_cpu_cap(X86_FEATURE_SME);
  65
  66         /*
  67          * Xen PV would need some work to support PCID: CR3 handling as well
  68 --
  69 2.14.2
  70