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target-i386: kvm: Enable all supported KVM features for -cpu host

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When using -cpu host, we don't need to use the kvm_default_features
variable, as the user is explicitly asking QEMU to enable all feature
supported by the host.

This changes the kvm_cpu_fill_host() code to use GET_SUPPORTED_CPUID to
initialize the kvm_features field, so we get all host KVM features
enabled.

This will also allow us to properly check/enforce KVM features inside
kvm_check_features_against_host() later. For example, we will be able to
make this:

  $ qemu-system-x86_64 -cpu ...,+kvm_pv_eoi,enforce

refuse to start if kvm_pv_eoi is not supported by the host (after we fix
kvm_check_features_against_host() to check KVM flags as well).

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>
This commit is contained in:
Eduardo Habkost 2013-01-04 20:01:05 -02:00 committed by Andreas Färber
parent fcb93c0360
commit bd004beff8
1 changed files with 2 additions and 0 deletions
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2
target-i386/cpu.c
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@ -900,6 +900,8 @@ static void kvm_cpu_fill_host(x86_def_t *x86_cpu_def)
/* Other KVM-specific feature fields: */
x86_cpu_def->svm_features =
kvm_arch_get_supported_cpuid(s, 0x8000000A, 0, R_EDX);
x86_cpu_def->kvm_features =
kvm_arch_get_supported_cpuid(s, KVM_CPUID_FEATURES, 0, R_EAX);
#endif /* CONFIG_KVM */
}