Re: [PATCH 3/4] KVM: MMU: track dirty page in speculative path properly

[Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>]

Marcelo Tosatti wrote:
> On Tue, Jul 13, 2010 at 05:45:27PM +0800, Xiao Guangrong wrote:
>> In speculative path, the page is not real write-access, no need mark it
>> dirty, so clear dirty bit in this path and later examine this bit when
>> we release the page
>>
>> Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
>> ---
>>  arch/x86/kvm/mmu.c |   24 +++++++++++-------------
>>  1 files changed, 11 insertions(+), 13 deletions(-)
> 
> Unfortunately all pages that kvm creates translations for are marked
> dirty due to get_user_pages(w=1), except KSM which makes them read-only
> later.

Marcelo, i have looked into get_user_pages() function, but not catch where
to make page dirty, could you point it out for me? :-)