On 07/27/2011 05:04 PM, Avi Kivity wrote: > On 07/26/2011 02:26 PM, Xiao Guangrong wrote: >> We usually use repeat string instructions to clear the page, for example, >> we call memset to clear a page table, stosb is used in this function, and >> repeated for 1024 times, that means we should occupy mmu lock for 1024 times >> and walking shadow page cache for 1024 times, it is terrible >> >> In fact, if it is the repeat string instructions emulated and it is not a >> IO/MMIO access, we can zap all the corresponding shadow pages and return to the >> guest, then the mapping can became writable and directly write the page > > Please generalize this to fail emulation on all non-page-table instructions when emulating due to a write protected page that we can unprotect. > OK, will do it in the next version, thanks! -- 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
