73 lines
2.7 KiB
Diff
73 lines
2.7 KiB
Diff
From 27d7b085f2f568050d638b694ed2f51495db718c Mon Sep 17 00:00:00 2001
|
|
From: Paolo Bonzini <pbonzini@redhat.com>
|
|
Date: Mon, 17 Feb 2020 16:23:15 +0000
|
|
Subject: [PATCH 5/9] target/i386: check for availability of MSR_IA32_UCODE_REV
|
|
as an emulated MSR
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
RH-Author: Paolo Bonzini <pbonzini@redhat.com>
|
|
Message-id: <20200217162316.2464-6-pbonzini@redhat.com>
|
|
Patchwork-id: 93898
|
|
O-Subject: [RHEL-AV-8.2.0 qemu-kvm PATCH 5/6] target/i386: check for availability of MSR_IA32_UCODE_REV as an emulated MSR
|
|
Bugzilla: 1791648
|
|
RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
|
|
RH-Acked-by: Maxim Levitsky <mlevitsk@redhat.com>
|
|
RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
|
|
|
|
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>
|
|
(cherry picked from commit 6702514814c7e7b4cbf179624539b5f38c72740b)
|
|
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
|
|
---
|
|
target/i386/kvm.c | 7 +++++--
|
|
1 file changed, 5 insertions(+), 2 deletions(-)
|
|
|
|
diff --git a/target/i386/kvm.c b/target/i386/kvm.c
|
|
index 6c61aef..99840ca 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);
|
|
}
|
|
|
|
--
|
|
1.8.3.1
|
|
|