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| author | Eduardo Habkost | 2014-01-20 17:41:11 +0100 |
|---|---|---|
| committer | Paolo Bonzini | 2014-02-03 17:33:54 +0100 |
| commit | 803a932706e3ba335d4c98f3577a05cb000f1699 (patch) | |
| tree | 36e4ba70a505d22749662c14f7909ae691d5c490 /target-i386 | |
| parent | target-i386: kvm_cpu_fill_host(): No need to check CPU vendor (diff) | |
| download | qemu-803a932706e3ba335d4c98f3577a05cb000f1699.tar.gz qemu-803a932706e3ba335d4c98f3577a05cb000f1699.tar.xz qemu-803a932706e3ba335d4c98f3577a05cb000f1699.zip | |
target-i386: kvm_cpu_fill_host(): No need to check xlevel2
There's no need to check CPU xlevel2 before calling
kvm_arch_get_supported_cpuid(s, 0xC0000001, 0, R_EDX), because:
* The kernel won't return any entry for 0xC0000000 if host CPU vendor
is not Centaur (See kvm_dev_ioctl_get_supported_cpuid() on the kernel
code)
* Similarly, the kernel won't return any entry for 0xC0000001 if
CPUID[0xC0000000].EAX is < 0xC0000001
* kvm_arch_get_supported_cpuid() will return 0 if no entry is returned
by the kernel for the requested leaf
For similar reasons, we can simply set x86_cpu_def->xlevel2 directly
instead of making it conditional, because it will be set to 0 CPU vendor
is not Centaur.
This will simplify the kvm_cpu_fill_host() code a little.
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
[Remove unparseable comment. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'target-i386')
| -rw-r--r-- | target-i386/cpu.c | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/target-i386/cpu.c b/target-i386/cpu.c index 1e115cf039..5c3817ca2d 100644 --- a/target-i386/cpu.c +++ b/target-i386/cpu.c @@ -1177,13 +1177,10 @@ static void kvm_cpu_fill_host(x86_def_t *x86_cpu_def) cpu_x86_fill_model_id(x86_cpu_def->model_id); /* Call Centaur's CPUID instruction. */ - eax = kvm_arch_get_supported_cpuid(s, 0xC0000000, 0, R_EAX); - if (eax >= 0xC0000001) { - /* Support VIA max extended level */ - x86_cpu_def->xlevel2 = eax; - x86_cpu_def->features[FEAT_C000_0001_EDX] = - kvm_arch_get_supported_cpuid(s, 0xC0000001, 0, R_EDX); - } + x86_cpu_def->xlevel2 = + kvm_arch_get_supported_cpuid(s, 0xC0000000, 0, R_EAX); + x86_cpu_def->features[FEAT_C000_0001_EDX] = + kvm_arch_get_supported_cpuid(s, 0xC0000001, 0, R_EDX); /* Other KVM-specific feature fields: */ x86_cpu_def->features[FEAT_SVM] = |