Re: [PATCH v2 0/6] KVM/x86: Drop "1" as MSR emulation return value

[Jürgen Groß]

On 28.05.26 15:21, Sean Christopherson wrote:
> On Thu, May 28, 2026, Jürgen Groß wrote:
> > On 28.05.26 15:09, Sean Christopherson wrote:
> > > On Thu, May 28, 2026, Juergen Gross wrote:
> > > > Please disregard this series, there is one complication sashiko made me
> > > > aware of.
> > >
> > > Sashiko beat me to the punch. :-)
> > >
> > > See commit 2368048bf5c2 ("KVM: x86: Signal #GP, not -EPERM, on bad WRMSR(MCi_CTL/STATUS)")
> > > for a real world example of how things can and will go wrong.
> >
> > Yeah, with Sashiko's pointer it was easy to spot.
> >
> > Question now is whether the already existing cases of -errno passed as return
> > value are wrong or on purpose.
>
> What are the existing cases?

Have a look at:

kvm_hv_msr_get_crash_data()
kvm_hv_msr_set_crash_data()
svm_get_msr()
svm_set_msr()


Juergen

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