[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v4 2/5] x86/msr: Carry on after a non-"safe" MSR access fails without !panic_on_oops
* Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote: > On Mon, Mar 14, 2016 at 11:40 AM, Linus Torvalds > <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote: > > On Mon, Mar 14, 2016 at 11:24 AM, Andy Lutomirski <luto@xxxxxxxxxxxxxx> > > wrote: > >> > >> The code in my queue is, literally: > >> > >> bool ex_handler_rdmsr_unsafe(const struct exception_table_entry *fixup, > >> struct pt_regs *regs, int trapnr) > >> { > >> WARN_ONCE(1, "unchecked MSR access error: RDMSR from 0x%x", > >> (unsigned int)regs->cx); > >> > >> /* Pretend that the read succeeded and returned 0. */ > >> regs->ip = ex_fixup_addr(fixup); > >> regs->ax = 0; > >> regs->dx = 0; > >> return true; > >> } > >> EXPORT_SYMBOL(ex_handler_rdmsr_unsafe); > > > > I guess I can live with this, as long as we also extend the > > early-fault handling to work with the special exception handlers. > > OK, will do. I need to rewrork the early IDT code a bit so it > generates a real pt_regs layout, but that's arguably a cleanup anyway. Ok, with that's I'm pretty happy about it as well. Thanks, Ingo _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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