diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2020-02-11 18:55:16 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-02-12 16:29:40 +0100 |
| commit | 6702514814c7e7b4cbf179624539b5f38c72740b (patch) | |
| tree | 876fc79afd7e4269509f4cf3686633e9892f46e3 /target/i386 | |
| parent | 9028c75c9d08be303ccc425bfe3d3b23d8f4cac7 (diff) | |
target/i386: check for availability of MSR_IA32_UCODE_REV as an emulated MSR
Even though MSR_IA32_UCODE_REV has been available long before Linux 5.6,
which added it to the emulated MSR list, a bug caused the microcode
version to revert to 0x100000000 on INIT. As a result, processors other
than the bootstrap processor would not see the host microcode revision;
some Windows version complain loudly about this and crash with a
fairly explicit MICROCODE REVISION MISMATCH error.
[If running 5.6 prereleases, the kernel fix "KVM: x86: do not reset
microcode version on INIT or RESET" should also be applied.]
Reported-by: Alex Williamson <alex.williamson@redhat.com>
Message-id: <20200211175516.10716-1-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'target/i386')
| -rw-r--r-- | target/i386/kvm.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/target/i386/kvm.c b/target/i386/kvm.c index 6ef291d580..69eb43d796 100644 --- a/target/i386/kvm.c +++ b/target/i386/kvm.c @@ -105,6 +105,7 @@ static bool has_msr_smi_count; static bool has_msr_arch_capabs; static bool has_msr_core_capabs; static bool has_msr_vmx_vmfunc; +static bool has_msr_ucode_rev; static uint32_t has_architectural_pmu_version; static uint32_t num_architectural_pmu_gp_counters; @@ -2056,6 +2057,9 @@ static int kvm_get_supported_msrs(KVMState *s) case MSR_IA32_VMX_VMFUNC: has_msr_vmx_vmfunc = true; break; + case MSR_IA32_UCODE_REV: + has_msr_ucode_rev = true; + break; } } } @@ -2696,8 +2700,7 @@ static void kvm_init_msrs(X86CPU *cpu) env->features[FEAT_CORE_CAPABILITY]); } - if (kvm_arch_get_supported_msr_feature(kvm_state, - MSR_IA32_UCODE_REV)) { + if (has_msr_ucode_rev) { kvm_msr_entry_add(cpu, MSR_IA32_UCODE_REV, cpu->ucode_rev); } |