[PATCH 1/5] i386: move hyperv_vendor_id initialization to x86_cpu_realizefn()

[Vitaly Kuznetsov <vkuznets@redhat.com>]

As a preparation to expanding Hyper-V CPU features early, move
hyperv_vendor_id initialization to x86_cpu_realizefn(). Introduce
x86_cpu_hyperv_realize() to not not pollute x86_cpu_realizefn()
itself.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
 target/i386/cpu.c | 23 ++++++++++++++++++++++-
 target/i386/cpu.h |  3 ++-
 target/i386/kvm.c | 25 ++++++++++---------------
 3 files changed, 34 insertions(+), 17 deletions(-)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 5a8c96072e41..2a6885753378 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -6509,6 +6509,25 @@ static void x86_cpu_filter_features(X86CPU *cpu, bool verbose)
     }
 }
 
+static void x86_cpu_hyperv_realize(X86CPU *cpu)
+{
+    size_t len;
+
+    /* Hyper-V vendor id */
+    if (!cpu->hyperv_vendor) {
+        memcpy(cpu->hyperv_vendor_id, "Microsoft Hv", 12);
+    } else {
+        len = strlen(cpu->hyperv_vendor);
+
+        if (len > 12) {
+            warn_report("hv-vendor-id truncated to 12 characters");
+            len = 12;
+        }
+        memset(cpu->hyperv_vendor_id, 0, 12);
+        memcpy(cpu->hyperv_vendor_id, cpu->hyperv_vendor, len);
+    }
+}
+
 static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
 {
     CPUState *cs = CPU(dev);
@@ -6680,6 +6699,8 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp)
         env->cache_info_amd.l3_cache = &legacy_l3_cache;
     }
 
+    /* Process Hyper-V enlightenments */
+    x86_cpu_hyperv_realize(cpu);
 
     cpu_exec_realizefn(cs, &local_err);
     if (local_err != NULL) {
@@ -7198,7 +7219,7 @@ static Property x86_cpu_properties[] = {
     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_STRING("hv-vendor-id", X86CPU, hyperv_vendor),
     DEFINE_PROP_BOOL("cpuid-0xb", X86CPU, enable_cpuid_0xb, true),
     DEFINE_PROP_BOOL("lmce", X86CPU, enable_lmce, false),
     DEFINE_PROP_BOOL("l3-cache", X86CPU, enable_l3_cache, true),
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 88e8586f8fb4..be640bf45c29 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -1655,11 +1655,12 @@ struct X86CPU {
     uint64_t ucode_rev;
 
     uint32_t hyperv_spinlock_attempts;
-    char *hyperv_vendor_id;
+    char *hyperv_vendor;
     bool hyperv_synic_kvm_only;
     uint64_t hyperv_features;
     bool hyperv_passthrough;
     OnOffAuto hyperv_no_nonarch_cs;
+    uint32_t hyperv_vendor_id[3];
 
     bool check_cpuid;
     bool enforce_cpuid;
diff --git a/target/i386/kvm.c b/target/i386/kvm.c
index a2934dda027c..788a2cf2ec51 100644
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -1205,6 +1205,13 @@ static int hyperv_handle_properties(CPUState *cs,
         memcpy(cpuid_ent, &cpuid->entries[0],
                cpuid->nent * sizeof(cpuid->entries[0]));
 
+        c = cpuid_find_entry(cpuid, HV_CPUID_VENDOR_AND_MAX_FUNCTIONS, 0);
+        if (c) {
+            cpu->hyperv_vendor_id[0] = c->ebx;
+            cpu->hyperv_vendor_id[1] = c->ecx;
+            cpu->hyperv_vendor_id[2] = c->edx;
+        }
+
         c = cpuid_find_entry(cpuid, HV_CPUID_FEATURES, 0);
         if (c) {
             env->features[FEAT_HYPERV_EAX] = c->eax;
@@ -1279,23 +1286,11 @@ static int hyperv_handle_properties(CPUState *cs,
 
     c = &cpuid_ent[cpuid_i++];
     c->function = HV_CPUID_VENDOR_AND_MAX_FUNCTIONS;
-    if (!cpu->hyperv_vendor_id) {
-        memcpy(signature, "Microsoft Hv", 12);
-    } else {
-        size_t len = strlen(cpu->hyperv_vendor_id);
-
-        if (len > 12) {
-            error_report("hv-vendor-id truncated to 12 characters");
-            len = 12;
-        }
-        memset(signature, 0, 12);
-        memcpy(signature, cpu->hyperv_vendor_id, len);
-    }
     c->eax = hyperv_feat_enabled(cpu, HYPERV_FEAT_EVMCS) ?
         HV_CPUID_NESTED_FEATURES : HV_CPUID_IMPLEMENT_LIMITS;
-    c->ebx = signature[0];
-    c->ecx = signature[1];
-    c->edx = signature[2];
+    c->ebx = cpu->hyperv_vendor_id[0];
+    c->ecx = cpu->hyperv_vendor_id[1];
+    c->edx = cpu->hyperv_vendor_id[2];
 
     c = &cpuid_ent[cpuid_i++];
     c->function = HV_CPUID_INTERFACE;
-- 
2.26.2