mirror of https://gitee.com/openkylin/linux.git
28f6bf9e24
When using nmi_enter() recursively, arch_nmi_enter() must also be recursion safe. In particular, it must be ensured that HCR_TGE is always set while in NMI context when in HYP mode, and be restored to it's former state when done. The current code fails this when interleaved wrong. Notably it overwrites the original hcr state on nesting. Introduce a nesting counter to make sure to store the original value. Signed-off-by: Frederic Weisbecker <frederic@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com> Cc: Will Deacon <will@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Link: https://lkml.kernel.org/r/20200505134100.771491291@linutronix.de |
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| Kbuild | ||
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