x86/hw_breakpoint: Prevent data breakpoints on user_pcid_flush_mask

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The per-CPU user_pcid_flush_mask is used in the low level entry code. A
data breakpoint can cause #DB recursion. 

Protect the full cpu_tlbstate structure for simplicity.

Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200526014221.2119-5-laijs@linux.alibaba.com
Link: https://lkml.kernel.org/r/20200529213320.955117574@infradead.org

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Lai Jiangshan 2020-05-29 23:27:32 +02:00 • committed by Thomas Gleixner

parent f9fe0b89f0

commit fdef24dfcc

1 changed files with 11 additions and 0 deletions

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arch/x86/kernel/hw_breakpoint.c

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