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KVM: Add generic RDPMC support

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Add a helper function that emulates the RDPMC instruction operation.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity
2011-11-10 14:57:23 +02:00
parent f5132b0138
commit 022cd0e840
2 changed files with 16 additions and 0 deletions
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1
arch/x86/include/asm/kvm_host.h
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@@ -760,6 +760,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data);
unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu); unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu);
void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags); void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags);
bool kvm_rdpmc(struct kvm_vcpu *vcpu);
void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr); void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr);
void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code); void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);

15
arch/x86/kvm/x86.c
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@@ -760,6 +760,21 @@ int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
} }
EXPORT_SYMBOL_GPL(kvm_get_dr); EXPORT_SYMBOL_GPL(kvm_get_dr);
bool kvm_rdpmc(struct kvm_vcpu *vcpu)
{
u32 ecx = kvm_register_read(vcpu, VCPU_REGS_RCX);
u64 data;
int err;
err = kvm_pmu_read_pmc(vcpu, ecx, &data);
if (err)
return err;
kvm_register_write(vcpu, VCPU_REGS_RAX, (u32)data);
kvm_register_write(vcpu, VCPU_REGS_RDX, data >> 32);
return err;
}
EXPORT_SYMBOL_GPL(kvm_rdpmc);
/* /*
* List of msr numbers which we expose to userspace through KVM_GET_MSRS * List of msr numbers which we expose to userspace through KVM_GET_MSRS
* and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST. * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.