On Fri, Dec 20, 2013 at 05:15:02PM +0800, Xiao Guangrong wrote: > On 12/20/2013 01:28 AM, Marcelo Tosatti wrote: > > > > It is possible for __direct_map to be called on invalid root_hpa > > (-1), two examples: > > > > 1) try_async_pf -> can_do_async_pf > > -> vmx_interrupt_allowed -> nested_vmx_vmexit > > 2) vmx_handle_exit -> vmx_interrupt_allowed -> nested_vmx_vmexit > > > > Then to load_vmcs12_host_state and kvm_mmu_reset_context. > > > > Check for this possibility, let fault exception be regenerated. > > > > BZ: https://bugzilla.redhat.com/show_bug.cgi?id=924916 > > > > Nice catch, Marcelo! > Isn't it better to do kvm_mmu_reload() before calling page_fault handler? > Then a #PF can be avoided. try_async_pf can be called from within the page fault handler. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
