On Tue, Nov 2, 2021 at 2:47 AM Oliver Upton <oupton@xxxxxxxxxx> 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@xxxxxxxxxx>
> ---
> 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
