On 07/20/2012 08:39 AM, Marcelo Tosatti wrote: > On Tue, Jul 17, 2012 at 09:53:29PM +0800, Xiao Guangrong wrote: >> If it have no indirect shadow pages we need not protect any gfn, >> this is always true for direct mmu without nested >> >> Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx> > > Xiao, > > What is the motivation? Numbers please. > mmu_need_write_protect is the common path for both soft-mmu and hard-mmu, checking indirect_shadow_pages can skip hash-table walking for the case which is tdp is enabled without nested guest. I will post the Number after I do the performance test. > In fact, what case was the original indirect_shadow_pages conditional in > kvm_mmu_pte_write optimizing again? > They are the different paths, mmu_need_write_protect is the real page fault path, and kvm_mmu_pte_write is caused by mmio emulation. -- 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
