[PATCH RFC v3 08/23] i386: keep hyperv_vendor string up-to-date

[Vitaly Kuznetsov <vkuznets@redhat.com>]

When cpu->hyperv_vendor is not set manually we default to "Microsoft Hv"
and in 'hv_passthrough' mode we get the information from the host. This
information is stored in cpu->hyperv_vendor_id[] array but we don't update
cpu->hyperv_vendor string so e.g. QMP's query-cpu-model-expansion output
is incorrect.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
 target/i386/cpu.c | 20 ++++++++++----------
 target/i386/kvm.c |  4 ++++
 2 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 45644f063947..c12d53938970 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -6495,18 +6495,18 @@ 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);
+        object_property_set_str(OBJECT(cpu), "hv-vendor-id", "Microsoft Hv",
+                                &error_abort);
+    }
+    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);
 
     /* 'Hv#1' interface identification*/
     cpu->hyperv_interface_id[0] = 0x31237648;
diff --git a/target/i386/kvm.c b/target/i386/kvm.c
index d2fee220d653..67e650d1e810 100644
--- a/target/i386/kvm.c
+++ b/target/i386/kvm.c
@@ -1214,6 +1214,10 @@ static int hyperv_handle_properties(CPUState *cs,
             cpu->hyperv_vendor_id[0] = c->ebx;
             cpu->hyperv_vendor_id[1] = c->ecx;
             cpu->hyperv_vendor_id[2] = c->edx;
+            cpu->hyperv_vendor = g_realloc(cpu->hyperv_vendor,
+                                           sizeof(cpu->hyperv_vendor_id) + 1);
+            memcpy(cpu->hyperv_vendor, cpu->hyperv_vendor_id,
+                   sizeof(cpu->hyperv_vendor_id));
         }
 
         c = cpuid_find_entry(cpuid, HV_CPUID_INTERFACE, 0);
-- 
2.25.4