On 01/27/2013 08:06 PM, Gleb Natapov wrote: > On Wed, Jan 23, 2013 at 06:04:17PM +0800, Xiao Guangrong wrote: >> Do not drop large spte until it can be insteaded by small pages so that >> the guest can happliy read memory through it >> >> The idea is from Avi: >> | As I mentioned before, write-protecting a large spte is a good idea, >> | since it moves some work from protect-time to fault-time, so it reduces >> | jitter. This removes the need for the return value. >> >> Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx> >> --- >> arch/x86/kvm/mmu.c | 21 ++++++--------------- >> 1 files changed, 6 insertions(+), 15 deletions(-) >> >> diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c >> index 9f628f7..0f90269 100644 >> --- a/arch/x86/kvm/mmu.c >> +++ b/arch/x86/kvm/mmu.c >> @@ -1105,7 +1105,7 @@ static void drop_large_spte(struct kvm_vcpu *vcpu, u64 *sptep) >> >> /* >> * Write-protect on the specified @sptep, @pt_protect indicates whether >> - * spte writ-protection is caused by protecting shadow page table. >> + * spte write-protection is caused by protecting shadow page table. >> * @flush indicates whether tlb need be flushed. >> * >> * Note: write protection is difference between drity logging and spte >> @@ -1114,31 +1114,23 @@ static void drop_large_spte(struct kvm_vcpu *vcpu, u64 *sptep) >> * its dirty bitmap is properly set. >> * - for spte protection, the spte can be writable only after unsync-ing >> * shadow page. >> - * >> - * Return true if the spte is dropped. >> */ >> -static bool >> +static void >> spte_write_protect(struct kvm *kvm, u64 *sptep, bool *flush, bool pt_protect) > Since return value is not longer used make the function return true if flush is needed > instead of returning it via pointer to a variable. Right, i forgot to check it, will update it in the next version. Thanks for your pointing it out. -- 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
