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

[Oliver Upton <oupton@google.com>]

On Tue, Nov 2, 2021 at 2:47 AM Oliver Upton <oupton@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@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.

--
Oliver