When KVM is running on VIA CPU with host cpu's model, the
feautures of VIA CPU will be passed into kvm guest by calling
the CPUID instruction for Centaur.
Signed-off-by: BrillyWu<brill...@viatech.com.cn>
Signed-off-by: KaryJin<kary...@viatech.com.cn>
---
target-i386/cpu.h | 3 +++
target-i386/cpuid.c | 46
+++++++++++++++++++++++++++++++++++++++++++++-
target-i386/kvm.c | 15 +++++++++++++++
3 files changed, 63 insertions(+), 1 deletion(-)
--- a/target-i386/cpu.h 2011-05-09 09:55:48.624885001 +0800
+++ b/target-i386/cpu.h 2011-05-09 09:48:53.704885019 +0800
@@ -721,6 +721,9 @@ typedef struct CPUX86State {
uint32_t cpuid_ext3_features;
uint32_t cpuid_apic_id;
int cpuid_vendor_override;
+ /* Store the results of Centaur's CPUID instructions */
+ uint32_t cpuid_xlevel2;
+ uint32_t cpuid_ext4_features;
/* MTRRs */
uint64_t mtrr_fixed[11];
--- a/target-i386/cpuid.c 2011-05-09 09:31:11.754884991 +0800
+++ b/target-i386/cpuid.c 2011-05-09 10:18:46.204885008 +0800
@@ -230,6 +230,9 @@ typedef struct x86_def_t {
char model_id[48];
int vendor_override;
uint32_t flags;
+ /* Store the results of Centaur's CPUID instructions */
+ uint32_t ext4_features;
+ uint32_t xlevel2;
} x86_def_t;
#define I486_FEATURES (CPUID_FP87 | CPUID_VME | CPUID_PSE)
@@ -522,6 +525,18 @@ static int cpu_x86_fill_host(x86_def_t *
cpu_x86_fill_model_id(x86_cpu_def->model_id);
x86_cpu_def->vendor_override = 0;
+ /* Call Centaur's CPUID instruction. */
+ if (x86_cpu_def->vendor1 == CPUID_VENDOR_VIA_1 &&
+ x86_cpu_def->vendor2 == CPUID_VENDOR_VIA_2 &&
+ x86_cpu_def->vendor3 == CPUID_VENDOR_VIA_3) {
+ host_cpuid(0xC0000000, 0, &eax, &ebx, &ecx, &edx);
+ if (eax >= 0xC0000001) {
+ /* Support VIA max extended level */
+ x86_cpu_def->xlevel2 = eax;
+ host_cpuid(0xC0000001, 0, &eax, &ebx, &ecx, &edx);
+ x86_cpu_def->ext4_features = edx;
+ }
+ }
/*
* Every SVM feature requires emulation support in KVM - so we
can't just
@@ -855,6 +870,8 @@ int cpu_x86_register (CPUX86State *env,
env->cpuid_xlevel = def->xlevel;
env->cpuid_kvm_features = def->kvm_features;
env->cpuid_svm_features = def->svm_features;
+ env->cpuid_ext4_features = def->ext4_features;
+ env->cpuid_xlevel2 = def->xlevel2;
if (!kvm_enabled()) {
env->cpuid_features &= TCG_FEATURES;
env->cpuid_ext_features &= TCG_EXT_FEATURES;
@@ -1034,7 +1051,12 @@ void cpu_x86_cpuid(CPUX86State *env, uin
uint32_t *ecx, uint32_t *edx)
{
/* test if maximum index reached */
- if (index & 0x80000000) {
+ if ((index & 0xC000000f) == index) {
+ /* Handle the Centaur's CPUID instruction. */
+ if (index > env->cpuid_xlevel2) {
+ index = env->cpuid_xlevel2;
+ }
+ } else if (index & 0x80000000) {
if (index > env->cpuid_xlevel)
index = env->cpuid_level;
} else {
@@ -1256,6 +1278,28 @@ void cpu_x86_cpuid(CPUX86State *env, uin
*edx = 0;
}
break;
+ case 0xC0000000:
+ *eax = env->cpuid_xlevel2;
+ *ebx = 0;
+ *ecx = 0;
+ *edx = 0;
+ break;
+ case 0xC0000001:
+ /* Support for VIA CPU's CPUID instruction */
+ *eax = env->cpuid_version;
+ *ebx = 0;
+ *ecx = 0;
+ *edx = env->cpuid_ext4_features;
+ break;
+ case 0xC0000002:
+ case 0xC0000003:
+ case 0xC0000004:
+ /* Reserved for the future, and now filled with zero */
+ *eax = 0;
+ *ebx = 0;
+ *ecx = 0;
+ *edx = 0;
+ break;
default:
/* reserved values: zero */
*eax = 0;
--- a/target-i386/kvm.c 2011-05-09 09:31:04.284884996 +0800
+++ b/target-i386/kvm.c 2011-05-09 09:55:42.984885014 +0800
@@ -492,6 +492,21 @@ int kvm_arch_init_vcpu(CPUState *env)
cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx);
}
+ /* Call Centaur's CPUID instructions they are supported. */
+ if (env->cpuid_xlevel2 > 0) {
+ env->cpuid_ext4_features &=
+ kvm_arch_get_supported_cpuid(env, 0xC0000001, 0, R_EDX);
+ cpu_x86_cpuid(env, 0xC0000000, 0, &limit, &unused, &unused,
&unused);
+
+ for (i = 0xC0000000; i <= limit; i++) {
+ c = &cpuid_data.entries[cpuid_i++];
+
+ c->function = i;
+ c->flags = 0;
+ cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx,
&c->edx);
+ }
+ }
+
cpuid_data.cpuid.nent = cpuid_i;
#ifdef KVM_CAP_MCE
