Messages in this thread | | | Date | Thu, 4 Jan 2018 19:34:35 +0100 | From | Andrea Arcangeli <> | Subject | Re: [PATCH 6/7] x86/spec_ctrl: Add sysctl knobs to enable/disable SPEC_CTRL feature |
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On Thu, Jan 04, 2018 at 09:56:47AM -0800, Tim Chen wrote: > There are 2 ways to control IBRS > > 1. At boot time > noibrs kernel boot parameter will disable IBRS usage > > Otherwise if the above parameters are not specified, the system > will enable ibrs and ibpb usage if the cpu supports it. > > 2. At run time > echo 0 > /sys/kernel/debug/ibrs_enabled will turn off IBRS > echo 1 > /sys/kernel/debug/ibrs_enabled will turn on IBRS in kernel > echo 2 > /sys/kernel/debug/ibrs_enabled will turn on IBRS in both userspace and kernel
debug/x86/?
Reviewed-by: Andrea Arcangeli <aarcange@redhat.com>
Thanks, Andrea
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