[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v1 3/6] x86: Enable Supervisor Mode Execution Prevention (SMAP) for Xen
On 15/04/14 14:01, Feng Wu wrote: > @@ -1379,8 +1396,8 @@ void do_page_fault(struct cpu_user_regs *regs) > > if ( unlikely(!guest_mode(regs)) ) > { > - pf_type = spurious_page_fault(addr, error_code); > - BUG_ON(pf_type == smep_fault); > + pf_type = spurious_page_fault(addr, regs); > + BUG_ON((pf_type == smep_fault) || (pf_type == smap_fault)); On further consideration, given the nature of faults like these, this code would be better as: if ( (pf_type == smep_fault) || (pf_type == smap_fault) ) { console_start_sync(); printk("Xen SM%cP violation", pf_type == smep_fault ? 'E' : 'A'); fatal_trap(TRAP_page_fault, regs); } This would make the resulting crash crystal clear as to what went wrong, and forgo the first step of having to look up which BUG() tripped. ~Andrew _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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