> > Unlike IDT, no need to save/restore dr7 in FRED machine check handler.
>
> Given how fragile MCE is, the question should be, do we ever want hw
> breakpoints to happen while it is running?
HW breakpoints still work if they are properly configured.
> If the hw-breakpoint handler trips on the same memory fail that got us into the
> mce the first time, we're dead.
Right.
Unless the MCIP bit is turned off any subsequent #MC goes to shutdown
("machine is screwed").
It's the kernel debugger's responsibility to decide how to proceed in such
cases. But if the kernel debugger itself is in a screwed memory region, we
are soooooo dead.
Thanks!
Xin
