On 07/18/2013 01:31 PM, Gleb Natapov wrote: > On Thu, Jul 18, 2013 at 12:52:37PM +0800, Xiao Guangrong wrote: >> Currently, fast page fault tries to fix mmio page fault when the >> generation number is invalid (spte.gen != kvm.gen) and returns to >> guest to retry the fault since it sees the last spte is nonpresent >> which causes infinity loop >> >> It can be triggered only on AMD host since the mmio page fault is >> recognized as ept-misconfig >> > We still call into regular page fault handler from ept-misconfig > handler, but fake zero error_code we provide makes page_fault_can_be_fast() > return false. Yes. > > Shouldn't shadow paging trigger this too? I haven't encountered this on > Intel without ept. Since currently fast page fault only works for direct mmu. :) -- 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
