[PATCH v2 2/6] KVM: arm64: Stash OSLSR_EL1 in the cpu context

[Reiji Watanabe]

On Tue, Nov 2, 2021 at 2:51 AM Oliver Upton <oupton at google.com> wrote:
>
> On Tue, Nov 2, 2021 at 2:47 AM Oliver Upton <oupton at google.com> wrote:
> >
> > An upcoming change to KVM will context switch the OS Lock status between
> > guest/host. Add OSLSR_EL1 to the cpu context and handle guest reads
> > using the stored value.
> >
> > Wire up a custom handler for writes from userspace and prevent any of
> > the invariant bits from changing.
> >
> > Signed-off-by: Oliver Upton <oupton at google.com>
> > ---
> >  arch/arm64/include/asm/kvm_host.h |  1 +
> >  arch/arm64/kvm/sys_regs.c         | 31 ++++++++++++++++++++++++-------
> >  2 files changed, 25 insertions(+), 7 deletions(-)
> >
> > diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> > index f8be56d5342b..c98f65c4a1f7 100644
> > --- a/arch/arm64/include/asm/kvm_host.h
> > +++ b/arch/arm64/include/asm/kvm_host.h
> > @@ -172,6 +172,7 @@ enum vcpu_sysreg {
> >         MDSCR_EL1,      /* Monitor Debug System Control Register */
> >         MDCCINT_EL1,    /* Monitor Debug Comms Channel Interrupt Enable Reg */
> >         DISR_EL1,       /* Deferred Interrupt Status Register */
> > +       OSLSR_EL1,      /* OS Lock Status Register */
>
> Sorry Marc, forgot to move this up per your suggestion on the last
> series. Only caught it once the patch went out the door.

Except for the above,
Reviewed-by: Reiji Watanabe <reijiw at google.com>

Thanks,
Reiji