patches/kernel/0008-kvm-x86-Add-AMD-s-EX_CFG-to-the-list-of-ignored-MSRs.patch

   1 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
   2 From: Eduardo Habkost <ehabkost@redhat.com>
   3 Date: Mon, 17 Dec 2018 22:34:18 -0200
   4 Subject: [PATCH] kvm: x86: Add AMD's EX_CFG to the list of ignored MSRs
   5
   6 Some guests OSes (including Windows 10) write to MSR 0xc001102c
   7 on some cases (possibly while trying to apply a CPU errata).
   8 Make KVM ignore reads and writes to that MSR, so the guest won't
   9 crash.
  10
  11 The MSR is documented as "Execution Unit Configuration (EX_CFG)",
  12 at AMD's "BIOS and Kernel Developer's Guide (BKDG) for AMD Family
  13 15h Models 00h-0Fh Processors".
  14
  15 Cc: stable@vger.kernel.org
  16 Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
  17 Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
  18 Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
  19 ---
  20  arch/x86/include/asm/msr-index.h | 1 +
  21  arch/x86/kvm/x86.c               | 2 ++
  22  2 files changed, 3 insertions(+)
  23
  24 diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
  25 index c8f73efb4ece..9e39cc8bd989 100644
  26 --- a/arch/x86/include/asm/msr-index.h
  27 +++ b/arch/x86/include/asm/msr-index.h
  28 @@ -390,6 +390,7 @@
  29  #define MSR_F15H_NB_PERF_CTR           0xc0010241
  30  #define MSR_F15H_PTSC                  0xc0010280
  31  #define MSR_F15H_IC_CFG                        0xc0011021
  32 +#define MSR_F15H_EX_CFG                        0xc001102c
  33
  34  /* Fam 10h MSRs */
  35  #define MSR_FAM10H_MMIO_CONF_BASE      0xc0010058
  36 diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
  37 index 477563e7ccbd..f049ecfac7bb 100644
  38 --- a/arch/x86/kvm/x86.c
  39 +++ b/arch/x86/kvm/x86.c
  40 @@ -2426,6 +2426,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
  41         case MSR_AMD64_PATCH_LOADER:
  42         case MSR_AMD64_BU_CFG2:
  43         case MSR_AMD64_DC_CFG:
  44 +       case MSR_F15H_EX_CFG:
  45                 break;
  46
  47         case MSR_IA32_UCODE_REV:
  48 @@ -2721,6 +2722,7 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
  49         case MSR_AMD64_BU_CFG2:
  50         case MSR_IA32_PERF_CTL:
  51         case MSR_AMD64_DC_CFG:
  52 +       case MSR_F15H_EX_CFG:
  53                 msr_info->data = 0;
  54                 break;
  55         case MSR_F15H_PERF_CTL0 ... MSR_F15H_PERF_CTR5: