Messages in this thread | | | Date | Wed, 27 Jul 2011 12:04:25 +0300 | From | Avi Kivity <> | Subject | Re: [PATCH 03/11] KVM: x86: fast emulate repeat string write instructions |
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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.
-- error compiling committee.c: too many arguments to function
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