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SubjectRe: [RFC PATCH 06/16] RISC-V: KVM: Implement KVM_GET_ONE_REG/KVM_SET_ONE_REG ioctls
On Tue, Jul 30, 2019 at 3:05 PM Paolo Bonzini <pbonzini@redhat.com> wrote:
>
> On 30/07/19 10:43, Paolo Bonzini wrote:
> > On 29/07/19 13:56, Anup Patel wrote:
> >> The PC register represents program counter whereas the MODE
> >> register represent VCPU privilege mode (i.e. S/U-mode).
> >>
> > Is there any reason to include this pseudo-register instead of allowing
> > SSTATUS access directly in this patch (and perhaps also SEPC)?
>
> Nevermind, I was confused - the current MODE is indeed not accessible as
> a "real" CSR in RISC-V.

Yes, you got it right.

>
> Still, I would prefer all the VS CSRs to be accessible via the get/set
> reg ioctls.

We had implemented VS CSRs access to user-space but then we
removed it to keep this series simple and easy to review. We thought
of adding it later when we deal with Guest/VM migration.

Do you want it to be added as part of this series ?

Regards,
Anup

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