A suggestion: please send a new mail to ask question, especially, when your question is not related to the patches, so that others will probably discover the topic and join the discussion. On 03/26/2014 12:25 AM, Hu Yaohui wrote: > Hi Guangrong, > Since you have written in the kvm/mmu.txt. > <quote> > > unsync: > If true, then the translations in this page may not match the guest's > translation. This is equivalent to the state of the tlb when a pte is > changed but before the tlb entry is flushed. Accordingly, unsync ptes > are synchronized when the guest executes invlpg or flushes its tlb by > other means. Valid for leaf pages. > > </quote> > > This make sense to me, my question is when those unsync bits will be > set? When the guest writes to the level 1 guest page tables, it will > not cause a page fault. Those unsync bit is unlikely to be set when > the entry is modified. (correct me if I am wrong). The bit is set in mmu_need_write_protect() where the host makes decision if the page need to be write-protected (!unsync) or to be unsynced. -- 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
