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Commit 022cd0e8 authored by Avi Kivity's avatar Avi Kivity
Browse files

KVM: Add generic RDPMC support 



Add a helper function that emulates the RDPMC instruction operation.

Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent f5132b01

arch/x86/include/asm/kvm_host.h

+1 −0
Original line number Diff line number Diff line
@@ -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);

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_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code);

arch/x86/kvm/x86.c

+15 −0
Original line number Diff line number Diff line
@@ -760,6 +760,21 @@ int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val) 
}

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

 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.