KVM: Add generic RDPMC support
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>
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 08ae951..27d18b7 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -760,6 +760,21 @@
}
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.