On 2016年01月14日 18:05, Peter Maydell wrote: > On 14 January 2016 at 06:03, <cheng...@emindsoft.com.cn> wrote: >> From: Chen Gang <cheng...@emindsoft.com.cn> >> >> Guest may allocate a readable, writable, and executable page, then write >> data on the page, and execute data as code on the page too, then write >> anther data still within the page. >> >> So remove this feature from linux-user: it not only consumes a little >> performance, but also causes issue with the old Linux kernel under some >> of architectures (they will directly generate segment fault for it). > > If we don't mark the page as non-writeable when we generate a TB > from it, how do we detect when guest code later writes to that > page (which means we need to invalidate the TB) ? >
For me, what you said above sounds reasonable, at present, that's really valuable to me :-) I guess, you also mean: our qemu will catch the host page fault signal and invalidate the TB. Thanks. -- Chen Gang (陈刚) Open, share, and attitude like air, water, and life which God blessed
