[Qemu-devel] [PATCH 1/2] KVM: CPUID takes ecx as input value for some functions

[Amit Shah]

The CPUID instruction takes the value of ECX as an input parameter
in addition to the value of EAX as the count for functions 4, 0xb
and 0xd. Make sure we pass the value to the instruction.

Also convert to the qemu-style whitespace for the surrounding code.

Signed-off-by: Amit Shah <address@hidden>
---
 qemu/target-i386/cpu.h       |    2 +-
 qemu/target-i386/helper.c    |   34 +++++++++++++++++-----------------
 qemu/target-i386/kvm.c       |    8 ++++----
 qemu/target-i386/op_helper.c |    2 +-
 4 files changed, 23 insertions(+), 23 deletions(-)

diff --git a/qemu/target-i386/cpu.h b/qemu/target-i386/cpu.h
index 7803560..cd773a0 100644
--- a/qemu/target-i386/cpu.h
+++ b/qemu/target-i386/cpu.h
@@ -742,7 +742,7 @@ int cpu_x86_signal_handler(int host_signum, void *pinfo,
 int cpu_x86_handle_mmu_fault(CPUX86State *env, target_ulong addr,
                              int is_write, int mmu_idx, int is_softmmu);
 void cpu_x86_set_a20(CPUX86State *env, int a20_state);
-void cpu_x86_cpuid(CPUX86State *env, uint32_t index,
+void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
                    uint32_t *eax, uint32_t *ebx,
                    uint32_t *ecx, uint32_t *edx);
 
diff --git a/qemu/target-i386/helper.c b/qemu/target-i386/helper.c
index a28ab93..9382fbf 100644
--- a/qemu/target-i386/helper.c
+++ b/qemu/target-i386/helper.c
@@ -1370,7 +1370,8 @@ static void breakpoint_handler(CPUState *env)
 }
 #endif /* !CONFIG_USER_ONLY */
 
-static void host_cpuid(uint32_t function, uint32_t *eax, uint32_t *ebx,
+static void host_cpuid(uint32_t function, uint32_t count,
+                       uint32_t *eax, uint32_t *ebx,
                        uint32_t *ecx, uint32_t *edx)
 {
 #if defined(CONFIG_KVM)
@@ -1378,19 +1379,19 @@ static void host_cpuid(uint32_t function, uint32_t 
*eax, uint32_t *ebx,
 
 #ifdef __x86_64__
     asm volatile("cpuid"
-                : "=a"(vec[0]), "=b"(vec[1]),
-                  "=c"(vec[2]), "=d"(vec[3])
-                : "0"(function) : "cc");
+                 : "=a"(vec[0]), "=b"(vec[1]),
+                   "=c"(vec[2]), "=d"(vec[3])
+                 : "0"(function), "c"(count) : "cc");
 #else
     asm volatile("pusha \n\t"
-                "cpuid \n\t"
-                "mov %%eax, 0(%1) \n\t"
-                "mov %%ebx, 4(%1) \n\t"
-                "mov %%ecx, 8(%1) \n\t"
-                "mov %%edx, 12(%1) \n\t"
-                "popa"
-                : : "a"(function), "S"(vec)
-                : "memory", "cc");
+                 "cpuid \n\t"
+                 "mov %%eax, 0(%1) \n\t"
+                 "mov %%ebx, 4(%1) \n\t"
+                 "mov %%ecx, 8(%1) \n\t"
+                 "mov %%edx, 12(%1) \n\t"
+                 "popa"
+                 : : "a"(function), "c"(count), "S"(vec)
+                 : "memory", "cc");
 #endif
 
     if (eax)
@@ -1404,7 +1405,7 @@ static void host_cpuid(uint32_t function, uint32_t *eax, 
uint32_t *ebx,
 #endif
 }
 
-void cpu_x86_cpuid(CPUX86State *env, uint32_t index,
+void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
                    uint32_t *eax, uint32_t *ebx,
                    uint32_t *ecx, uint32_t *edx)
 {
@@ -1429,7 +1430,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index,
          * actuall cpu, and say goodbye to migration between different vendors
          * is you use compatibility mode. */
         if (kvm_enabled())
-            host_cpuid(0, NULL, ebx, ecx, edx);
+            host_cpuid(0, 0, NULL, ebx, ecx, edx);
         break;
     case 1:
         *eax = env->cpuid_version;
@@ -1450,7 +1451,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index,
         break;
     case 4:
         /* cache info: needed for Core compatibility */
-        switch (*ecx) {
+        switch (count) {
             case 0: /* L1 dcache info */
                 *eax = 0x0000121;
                 *ebx = 0x1c0003f;
@@ -1476,7 +1477,6 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index,
                 *edx = 0;
                 break;
         }
-
         break;
     case 5:
         /* mwait info: needed for Core compatibility */
@@ -1521,7 +1521,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index,
         if (kvm_enabled()) {
             uint32_t h_eax, h_edx;
 
-            host_cpuid(0x80000001, &h_eax, NULL, NULL, &h_edx);
+            host_cpuid(index, 0, &h_eax, NULL, NULL, &h_edx);
 
             /* disable CPU features that the host does not support */
 
diff --git a/qemu/target-i386/kvm.c b/qemu/target-i386/kvm.c
index 2412ae4..7c84e24 100644
--- a/qemu/target-i386/kvm.c
+++ b/qemu/target-i386/kvm.c
@@ -44,13 +44,13 @@ int kvm_arch_init_vcpu(CPUState *env)
 
     cpuid_i = 0;
 
-    cpu_x86_cpuid(env, 0, &eax, &ebx, &ecx, &edx);
+    cpu_x86_cpuid(env, 0, 0, &eax, &ebx, &ecx, &edx);
     limit = eax;
 
     for (i = 0; i <= limit; i++) {
         struct kvm_cpuid_entry *c = &cpuid_data.entries[cpuid_i++];
 
-        cpu_x86_cpuid(env, i, &eax, &ebx, &ecx, &edx);
+        cpu_x86_cpuid(env, i, 0, &eax, &ebx, &ecx, &edx);
         c->function = i;
         c->eax = eax;
         c->ebx = ebx;
@@ -58,13 +58,13 @@ int kvm_arch_init_vcpu(CPUState *env)
         c->edx = edx;
     }
 
-    cpu_x86_cpuid(env, 0x80000000, &eax, &ebx, &ecx, &edx);
+    cpu_x86_cpuid(env, 0x80000000, 0, &eax, &ebx, &ecx, &edx);
     limit = eax;
 
     for (i = 0x80000000; i <= limit; i++) {
         struct kvm_cpuid_entry *c = &cpuid_data.entries[cpuid_i++];
 
-        cpu_x86_cpuid(env, i, &eax, &ebx, &ecx, &edx);
+        cpu_x86_cpuid(env, i, 0, &eax, &ebx, &ecx, &edx);
         c->function = i;
         c->eax = eax;
         c->ebx = ebx;
diff --git a/qemu/target-i386/op_helper.c b/qemu/target-i386/op_helper.c
index 6e0e32e..74ba643 100644
--- a/qemu/target-i386/op_helper.c
+++ b/qemu/target-i386/op_helper.c
@@ -1898,7 +1898,7 @@ void helper_cpuid(void)
 
     helper_svm_check_intercept_param(SVM_EXIT_CPUID, 0);
 
-    cpu_x86_cpuid(env, (uint32_t)EAX, &eax, &ebx, &ecx, &edx);
+    cpu_x86_cpuid(env, (uint32_t)EAX, (uint32_t)ECX, &eax, &ebx, &ecx, &edx);
     EAX = eax;
     EBX = ebx;
     ECX = ecx;
-- 
1.6.0.6