[PATCH] KVM: userspace: 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. Fetch these cpuid values and pass them on to the kernel.

Signed-off-by: Amit Shah <amit.s...@redhat.com>
---
 qemu/qemu-kvm-x86.c |   24 +++++++++++++++++++-----
 1 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/qemu/qemu-kvm-x86.c b/qemu/qemu-kvm-x86.c
index 4fad2af..fbcd2bd 100644
--- a/qemu/qemu-kvm-x86.c
+++ b/qemu/qemu-kvm-x86.c
@@ -463,9 +463,10 @@ void kvm_arch_save_regs(CPUState *env)
 }
 
 static void do_cpuid_ent(struct kvm_cpuid_entry *e, uint32_t function,
-                        CPUState *env)
+                         uint32_t count, CPUState *env)
 {
     env->regs[R_EAX] = function;
+    env->regs[R_ECX] = count;
     qemu_kvm_cpuid_on_env(env);
     e->function = function;
     e->eax = env->regs[R_EAX];
@@ -514,7 +515,7 @@ int kvm_arch_qemu_init_env(CPUState *cenv)
 #endif
     int cpuid_nent = 0;
     CPUState copy;
-    uint32_t i, limit;
+    uint32_t i, j, limit;
 
     copy = *cenv;
 
@@ -539,15 +540,28 @@ int kvm_arch_qemu_init_env(CPUState *cenv)
     qemu_kvm_cpuid_on_env(&copy);
     limit = copy.regs[R_EAX];
 
-    for (i = 0; i <= limit; ++i)
-       do_cpuid_ent(&cpuid_ent[cpuid_nent++], i, &copy);
+    for (i = 0; i <= limit; ++i) {
+        if (i == 4 || i == 0xb || i == 0xd) {
+            for (j = 0; ; ++j) {
+                do_cpuid_ent(&cpuid_ent[cpuid_nent++], i, j, &copy);
+
+                if (i == 4 && copy.regs[R_EAX] == 0)
+                    break;
+                if (i == 0xb && !(copy.regs[R_ECX] & 0xff00))
+                    break;
+                if (i == 0xd && copy.regs[R_EAX] == 0)
+                    break;
+            }
+        } else
+            do_cpuid_ent(&cpuid_ent[cpuid_nent++], i, 0, &copy);
+    }
 
     copy.regs[R_EAX] = 0x80000000;
     qemu_kvm_cpuid_on_env(&copy);
     limit = copy.regs[R_EAX];
 
     for (i = 0x80000000; i <= limit; ++i)
-       do_cpuid_ent(&cpuid_ent[cpuid_nent++], i, &copy);
+       do_cpuid_ent(&cpuid_ent[cpuid_nent++], i, 0, &copy);
 
     kvm_setup_cpuid(kvm_context, cenv->cpu_index, cpuid_nent, cpuid_ent);
     return 0;
-- 
1.6.0.6

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