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 _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm