[PATCH 2/3] target/i386: add a ucode-rev property

[Paolo Bonzini <pbonzini@redhat.com>]

Add the property and plumb it in TCG and HVF (the latter of which
tried to support returning a constant value but used the wrong MSR).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 target/i386/cpu.c         | 10 ++++++++++
 target/i386/cpu.h         |  3 +++
 target/i386/hvf/x86_emu.c |  4 +---
 target/i386/misc_helper.c |  4 ++++
 4 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 41f28ce..05ce64c 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -6418,6 +6418,15 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
         }
     }
 
+    if (cpu->ucode_rev == 0) {
+        /* The default is the same as KVM's.  */
+        if (IS_AMD_CPU(env)) {
+            cpu->ucode_rev = 0x01000065;
+        } else {
+            cpu->ucode_rev = 0x100000000ULL;
+        }
+    }
+
     /* mwait extended info: needed for Core compatibility */
     /* We always wake on interrupt even if host does not have the capability */
     cpu->mwait.ecx |= CPUID_MWAIT_EMX | CPUID_MWAIT_IBE;
@@ -7100,6 +7109,7 @@ static Property x86_cpu_properties[] = {
     DEFINE_PROP_UINT32("min-level", X86CPU, env.cpuid_min_level, 0),
     DEFINE_PROP_UINT32("min-xlevel", X86CPU, env.cpuid_min_xlevel, 0),
     DEFINE_PROP_UINT32("min-xlevel2", X86CPU, env.cpuid_min_xlevel2, 0),
+    DEFINE_PROP_UINT64("ucode-rev", X86CPU, ucode_rev, 0),
     DEFINE_PROP_BOOL("full-cpuid-auto-level", X86CPU, full_cpuid_auto_level, true),
     DEFINE_PROP_STRING("hv-vendor-id", X86CPU, hyperv_vendor_id),
     DEFINE_PROP_BOOL("cpuid-0xb", X86CPU, enable_cpuid_0xb, true),
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index e6de38a..576f309 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -348,6 +348,7 @@ typedef enum X86Seg {
 #define MSR_IA32_SPEC_CTRL              0x48
 #define MSR_VIRT_SSBD                   0xc001011f
 #define MSR_IA32_PRED_CMD               0x49
+#define MSR_IA32_UCODE_REV              0x8b
 #define MSR_IA32_CORE_CAPABILITY        0xcf
 
 #define MSR_IA32_ARCH_CAPABILITIES      0x10a
@@ -1627,6 +1628,8 @@ struct X86CPU {
     CPUNegativeOffsetState neg;
     CPUX86State env;
 
+    uint64_t ucode_rev;
+
     uint32_t hyperv_spinlock_attempts;
     char *hyperv_vendor_id;
     bool hyperv_synic_kvm_only;
diff --git a/target/i386/hvf/x86_emu.c b/target/i386/hvf/x86_emu.c
index 3df7672..92ab815 100644
--- a/target/i386/hvf/x86_emu.c
+++ b/target/i386/hvf/x86_emu.c
@@ -664,8 +664,6 @@ static void exec_lods(struct CPUX86State *env, struct x86_decode *decode)
     RIP(env) += decode->len;
 }
 
-#define MSR_IA32_UCODE_REV 0x00000017
-
 void simulate_rdmsr(struct CPUState *cpu)
 {
     X86CPU *x86_cpu = X86_CPU(cpu);
@@ -681,7 +679,7 @@ void simulate_rdmsr(struct CPUState *cpu)
         val = cpu_get_apic_base(X86_CPU(cpu)->apic_state);
         break;
     case MSR_IA32_UCODE_REV:
-        val = (0x100000000ULL << 32) | 0x100000000ULL;
+        val = x86_cpu->ucode_rev;
         break;
     case MSR_EFER:
         val = rvmcs(cpu->hvf_fd, VMCS_GUEST_IA32_EFER);
diff --git a/target/i386/misc_helper.c b/target/i386/misc_helper.c
index 3eff688..aed16fe 100644
--- a/target/i386/misc_helper.c
+++ b/target/i386/misc_helper.c
@@ -229,6 +229,7 @@ void helper_rdmsr(CPUX86State *env)
 #else
 void helper_wrmsr(CPUX86State *env)
 {
+    X86CPU *x86_cpu = env_archcpu(env);
     uint64_t val;
 
     cpu_svm_check_intercept_param(env, SVM_EXIT_MSR, 1, GETPC());
@@ -371,6 +372,9 @@ void helper_wrmsr(CPUX86State *env)
         env->msr_bndcfgs = val;
         cpu_sync_bndcs_hflags(env);
         break;
+     case MSR_IA32_UCODE_REV:
+        val = x86_cpu->ucode_rev;
+        break;
     default:
         if ((uint32_t)env->regs[R_ECX] >= MSR_MC0_CTL
             && (uint32_t)env->regs[R_ECX] < MSR_MC0_CTL +
-- 
1.8.3.1