[PATCH] The nested NMI modifies the place (instruction, flags and stack)

that the first NMI will iret to. However, the copy of registers modified is exactly the one that is the part of pt_regs in the first NMI. This can change the behaviour of the first NMI. In particular, Google's arch_trigger_all_cpu_backtrace handler also prints regions of memory surrounding

[PATCH] The nested NMI modifies the place (instruction, flags and stack)

that the first NMI will iret to. However, the copy of registers modified is exactly the one that is the part of pt_regs in the first NMI. This can change the behaviour of the first NMI. In particular, Google's arch_trigger_all_cpu_backtrace handler also prints regions of memory surrounding