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KVM: Handle cpuid in the kernel instead of punting to userspace

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KVM used to handle cpuid by letting userspace decide what values to
return to the guest.  We now handle cpuid completely in the kernel.  We
still let userspace decide which values the guest will see by having
userspace set up the value table beforehand (this is necessary to allow
management software to set the cpu features to the least common denominator,
so that live migration can work).

The motivation for the change is that kvm kernel code can be impacted by
cpuid features, for example the x86 emulator.

Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Avi Kivity
2007-02-28 20:46:53 +02:00
parent 46fc147788
commit 06465c5a3a
5 changed files with 95 additions and 5 deletions
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4
drivers/kvm/svm.c
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@ -1101,8 +1101,8 @@ static int task_switch_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_r
static int cpuid_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
vcpu->svm->next_rip = vcpu->svm->vmcb->save.rip + 2;
kvm_run->exit_reason = KVM_EXIT_CPUID;
return 0;
kvm_emulate_cpuid(vcpu);
return 1;
}
static int emulate_on_interception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)