On Mon, May 24, 2021 at 11:45:10AM +0100, Steven Price wrote: > diff --git a/arch/arm64/include/asm/kvm_mte.h b/arch/arm64/include/asm/kvm_mte.h > new file mode 100644 > index 000000000000..eae4bce9e269 > --- /dev/null > +++ b/arch/arm64/include/asm/kvm_mte.h > @@ -0,0 +1,68 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +/* > + * Copyright (C) 2020 ARM Ltd. You may want to update some of the years. > + */ > +#ifndef __ASM_KVM_MTE_H > +#define __ASM_KVM_MTE_H > + > +#ifdef __ASSEMBLY__ > + > +#include <asm/sysreg.h> > + > +#ifdef CONFIG_ARM64_MTE > + > +.macro mte_switch_to_guest g_ctxt, h_ctxt, reg1 > +alternative_if_not ARM64_MTE > + b .L__skip_switch\@ > +alternative_else_nop_endif > + mrs \reg1, hcr_el2 > + and \reg1, \reg1, #(HCR_ATA) > + cbz \reg1, .L__skip_switch\@ Nitpick: TBZ would be shorter, though you need the bit number. The patch looks fine (as per my understanding of the KVM context switching code): Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx> _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
