On Tue, May 22, 2018 at 04:06:44PM +0100, Marc Zyngier wrote: > If running on a system that performs dynamic SSBD mitigation, allow > userspace to request the mitigation for itself. This is implemented > as a prctl call, allowing the mitigation to be enabled or disabled at > will for this particular thread. > > Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx> > --- > arch/arm64/kernel/Makefile | 1 + > arch/arm64/kernel/ssbd.c | 107 +++++++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 108 insertions(+) > create mode 100644 arch/arm64/kernel/ssbd.c > > diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile > index bf825f38d206..0025f8691046 100644 > --- a/arch/arm64/kernel/Makefile > +++ b/arch/arm64/kernel/Makefile > @@ -54,6 +54,7 @@ arm64-obj-$(CONFIG_ARM64_RELOC_TEST) += arm64-reloc-test.o > arm64-reloc-test-y := reloc_test_core.o reloc_test_syms.o > arm64-obj-$(CONFIG_CRASH_DUMP) += crash_dump.o > arm64-obj-$(CONFIG_ARM_SDE_INTERFACE) += sdei.o > +arm64-obj-$(CONFIG_ARM64_SSBD) += ssbd.o > > obj-y += $(arm64-obj-y) vdso/ probes/ > obj-m += $(arm64-obj-m) > diff --git a/arch/arm64/kernel/ssbd.c b/arch/arm64/kernel/ssbd.c > new file mode 100644 > index 000000000000..34e3c430176b > --- /dev/null > +++ b/arch/arm64/kernel/ssbd.c > @@ -0,0 +1,107 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (C) 2018 ARM Ltd, All Rights Reserved. > + */ > + > +#include <linux/sched.h> > +#include <linux/thread_info.h> > + > +#include <asm/cpufeature.h> > + > +/* > + * prctl interface for SSBD > + * FIXME: Drop the below ifdefery once the common interface has been merged. > + */ > +#ifdef PR_SPEC_STORE_BYPASS That FIXME wants to be looked at. Thanks, Dominik _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
