Re: [PATCH 1/3] Implement bare minimum of HYPER-V MSRs.

[Gleb Natapov <gleb@redhat.com>]

On Wed, Jan 13, 2010 at 04:21:33PM +0200, Avi Kivity wrote:
> >  int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
> >  {
> >  	switch (msr) {
> >@@ -1117,6 +1181,16 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
> >  		pr_unimpl(vcpu, "unimplemented perfctr wrmsr: "
> >  			"0x%x data 0x%llx\n", msr, data);
> >  		break;
> >+	case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
> >+		if (kvm_hv_msr_partition_wide(msr)) {
> >+			int r;
> >+			mutex_lock(&vcpu->kvm->lock);
> >+			r = set_msr_hyperv_pw(vcpu, msr, data);
> >+			mutex_unlock(&vcpu->kvm->lock);
> 
> We do have locking.  Any reason not to put it in set_msr_hyperv_pw?
> Seems cleaner.
> 
Actually the way I did it looks cleaner to me. If locking is done inside
set_msr_hyperv_pw() then each simple "return" statement there will have
to be changed into {ret=val; goto unlock;}.

--
			Gleb.