lkml.org 
[lkml]   [2011]   [Aug]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2 05/12] KVM: x86: fast emulate repeat string write instructions
On 08/02/2011 02:09 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 we can directly write the page
>

This isn't needed if we zap before emulating, right?

--
error compiling committee.c: too many arguments to function



\
 
 \ /
  Last update: 2011-08-03 10:13    [from the cache]
©2003-2011 Jasper Spaans