[Qemu-devel] [PATCH] KVM: Fetch sub-leaf cpuid values for functions 4, 0xb, 0xd.

[Amit Shah]

CPUID functions 4, 0xb and 0xd have sub-leaf values which depend on the
input value of ECX. Store these values as well.

Signed-off-by: Amit Shah <address@hidden>
---
 qemu/target-i386/kvm.c |   34 ++++++++++++++++++++++++++--------
 1 files changed, 26 insertions(+), 8 deletions(-)

diff --git a/qemu/target-i386/kvm.c b/qemu/target-i386/kvm.c
index bef3150..c17e58b 100644
--- a/qemu/target-i386/kvm.c
+++ b/qemu/target-i386/kvm.c
@@ -39,7 +39,7 @@ int kvm_arch_init_vcpu(CPUState *env)
         struct kvm_cpuid cpuid;
         struct kvm_cpuid_entry entries[100];
     } __attribute__((packed)) cpuid_data;
-    uint32_t limit, i, cpuid_i;
+    uint32_t limit, i, j, cpuid_i;
     uint32_t eax, ebx, ecx, edx;
 
     cpuid_i = 0;
@@ -50,14 +50,32 @@ int kvm_arch_init_vcpu(CPUState *env)
     for (i = 0; i <= limit; i++) {
         struct kvm_cpuid_entry *c = &cpuid_data.entries[cpuid_i++];
 
-        cpu_x86_cpuid(env, i, 0, &eax, &ebx, &ecx, &edx);
-        c->function = i;
-        c->eax = eax;
-        c->ebx = ebx;
-        c->ecx = ecx;
-        c->edx = edx;
+        if (i == 4 || i == 0xb || i == 0xd) {
+            for (j = 0; ; j++) {
+                cpu_x86_cpuid(env, i, j, &eax, &ebx, &ecx, &edx);
+                c->function = i;
+                c->eax = eax;
+                c->ebx = ebx;
+                c->ecx = ecx;
+                c->edx = edx;
+                c = &cpuid_data.entries[++cpuid_i];
+
+                if (i == 4 && eax == 0)
+                    break;
+                if (i == 0xb && !(ecx & 0xff00))
+                    break;
+                if (i == 0xd && eax == 0)
+                    break;
+            }
+        } else {
+            cpu_x86_cpuid(env, i, 0, &eax, &ebx, &ecx, &edx);
+            c->function = i;
+            c->eax = eax;
+            c->ebx = ebx;
+            c->ecx = ecx;
+            c->edx = edx;
+        }
     }
-
     cpu_x86_cpuid(env, 0x80000000, 0, &eax, &ebx, &ecx, &edx);
     limit = eax;
 
-- 
1.6.0.6