Messages in this thread | | | From | Andy Lutomirski <> | Date | Mon, 25 May 2020 21:17:32 -0700 | Subject | Re: [RFC PATCH V2 4/7] x86/hw_breakpoint: Prevent data breakpoints on user_pcid_flush_mask |
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On Mon, May 25, 2020 at 6:42 PM Lai Jiangshan <laijs@linux.alibaba.com> wrote: > > The percpu user_pcid_flush_mask is used for CPU entry > If a data breakpoint on it, it will cause an unwanted #DB. > Protect the full cpu_tlbstate structure to be sure. > > There are some other percpu data used in CPU entry, but they are > either in already-protected cpu_tss_rw or are safe to trigger #DB > (espfix_waddr, espfix_stack).
How hard would it be to rework this to have DECLARE_PERCPU_NODEBUG() and DEFINE_PERCPU_NODEBUG() or similar?
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