i386: introduce hv_cpuid_get_host()

As a preparation to implementing hv_cpuid_cache intro introduce
hv_cpuid_get_host(). No functional change intended.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20210422161130.652779-7-vkuznets@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

1 files changed, 57 insertions, 45 deletions

diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index 712285df40..018f19c3a3 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -1108,6 +1108,19 @@ static int hv_cpuid_get_fw(struct kvm_cpuid2 *cpuid, int fw, uint32_t *r)
     return 0;
 }
 
+static uint32_t hv_cpuid_get_host(struct kvm_cpuid2 *cpuid, uint32_t func,
+                                  int reg)
+{
+    struct kvm_cpuid_entry2 *entry;
+
+    entry = cpuid_find_entry(cpuid, func, 0);
+    if (!entry) {
+        return 0;
+    }
+
+    return cpuid_entry_get_reg(entry, reg);
+}
+
 static bool hyperv_feature_supported(struct kvm_cpuid2 *cpuid, int feature)
 {
     uint32_t r, fw, bits;
@@ -1204,7 +1217,7 @@ static int hyperv_handle_properties(CPUState *cs,
 {
     X86CPU *cpu = X86_CPU(cs);
     struct kvm_cpuid2 *cpuid;
-    struct kvm_cpuid_entry2 *c, *c2;
+    struct kvm_cpuid_entry2 *c;
     uint32_t cpuid_i = 0;
     int r;
 
@@ -1236,46 +1249,47 @@ static int hyperv_handle_properties(CPUState *cs,
     }
 
     if (cpu->hyperv_passthrough) {
-        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;
-            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));
-            cpu->hyperv_vendor[sizeof(cpu->hyperv_vendor_id)] = 0;
-        }
-
-        c = cpuid_find_entry(cpuid, HV_CPUID_INTERFACE, 0);
-        if (c) {
-            cpu->hyperv_interface_id[0] = c->eax;
-            cpu->hyperv_interface_id[1] = c->ebx;
-            cpu->hyperv_interface_id[2] = c->ecx;
-            cpu->hyperv_interface_id[3] = c->edx;
-        }
-
-        c = cpuid_find_entry(cpuid, HV_CPUID_VERSION, 0);
-        if (c) {
-            cpu->hyperv_version_id[0] = c->eax;
-            cpu->hyperv_version_id[1] = c->ebx;
-            cpu->hyperv_version_id[2] = c->ecx;
-            cpu->hyperv_version_id[3] = c->edx;
-        }
-
-        c = cpuid_find_entry(cpuid, HV_CPUID_IMPLEMENT_LIMITS, 0);
-        if (c) {
-            cpu->hv_max_vps = c->eax;
-            cpu->hyperv_limits[0] = c->ebx;
-            cpu->hyperv_limits[1] = c->ecx;
-            cpu->hyperv_limits[2] = c->edx;
-        }
-
-        c = cpuid_find_entry(cpuid, HV_CPUID_ENLIGHTMENT_INFO, 0);
-        if (c) {
-            cpu->hyperv_spinlock_attempts = c->ebx;
-        }
+        cpu->hyperv_vendor_id[0] =
+            hv_cpuid_get_host(cpuid, HV_CPUID_VENDOR_AND_MAX_FUNCTIONS, R_EBX);
+        cpu->hyperv_vendor_id[1] =
+            hv_cpuid_get_host(cpuid, HV_CPUID_VENDOR_AND_MAX_FUNCTIONS, R_ECX);
+        cpu->hyperv_vendor_id[2] =
+            hv_cpuid_get_host(cpuid, HV_CPUID_VENDOR_AND_MAX_FUNCTIONS, R_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));
+        cpu->hyperv_vendor[sizeof(cpu->hyperv_vendor_id)] = 0;
+
+        cpu->hyperv_interface_id[0] =
+            hv_cpuid_get_host(cpuid, HV_CPUID_INTERFACE, R_EAX);
+        cpu->hyperv_interface_id[1] =
+            hv_cpuid_get_host(cpuid, HV_CPUID_INTERFACE, R_EBX);
+        cpu->hyperv_interface_id[2] =
+            hv_cpuid_get_host(cpuid, HV_CPUID_INTERFACE, R_ECX);
+        cpu->hyperv_interface_id[3] =
+            hv_cpuid_get_host(cpuid, HV_CPUID_INTERFACE, R_EDX);
+
+        cpu->hyperv_version_id[0] =
+            hv_cpuid_get_host(cpuid, HV_CPUID_VERSION, R_EAX);
+        cpu->hyperv_version_id[1] =
+            hv_cpuid_get_host(cpuid, HV_CPUID_VERSION, R_EBX);
+        cpu->hyperv_version_id[2] =
+            hv_cpuid_get_host(cpuid, HV_CPUID_VERSION, R_ECX);
+        cpu->hyperv_version_id[3] =
+            hv_cpuid_get_host(cpuid, HV_CPUID_VERSION, R_EDX);
+
+        cpu->hv_max_vps = hv_cpuid_get_host(cpuid, HV_CPUID_IMPLEMENT_LIMITS,
+                                            R_EAX);
+        cpu->hyperv_limits[0] =
+            hv_cpuid_get_host(cpuid, HV_CPUID_IMPLEMENT_LIMITS, R_EBX);
+        cpu->hyperv_limits[1] =
+            hv_cpuid_get_host(cpuid, HV_CPUID_IMPLEMENT_LIMITS, R_ECX);
+        cpu->hyperv_limits[2] =
+            hv_cpuid_get_host(cpuid, HV_CPUID_IMPLEMENT_LIMITS, R_EDX);
+
+        cpu->hyperv_spinlock_attempts =
+            hv_cpuid_get_host(cpuid, HV_CPUID_ENLIGHTMENT_INFO, R_EBX);
     }
 
     /* Features */
@@ -1349,10 +1363,8 @@ static int hyperv_handle_properties(CPUState *cs,
     if (cpu->hyperv_no_nonarch_cs == ON_OFF_AUTO_ON) {
         c->eax |= HV_NO_NONARCH_CORESHARING;
     } else if (cpu->hyperv_no_nonarch_cs == ON_OFF_AUTO_AUTO) {
-        c2 = cpuid_find_entry(cpuid, HV_CPUID_ENLIGHTMENT_INFO, 0);
-        if (c2) {
-            c->eax |= c2->eax & HV_NO_NONARCH_CORESHARING;
-        }
+        c->eax |= hv_cpuid_get_host(cpuid, HV_CPUID_ENLIGHTMENT_INFO, R_EAX) &
+            HV_NO_NONARCH_CORESHARING;
     }
 
     c = &cpuid_ent[cpuid_i++];