Messages in this thread | | | Date | Fri, 03 May 2013 13:57:38 +0800 | From | Xiao Guangrong <> | Subject | Re: [PATCH v4 3/6] KVM: MMU: introduce kvm_clear_all_lpage_info |
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On 05/03/2013 10:15 AM, Takuya Yoshikawa wrote: > On Sat, 27 Apr 2013 11:13:19 +0800 > Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> wrote: > >> This function is used to reset the large page info of all guest pages >> which will be used in later patch >> >> Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> >> --- >> arch/x86/kvm/x86.c | 25 +++++++++++++++++++++++++ >> arch/x86/kvm/x86.h | 2 ++ >> 2 files changed, 27 insertions(+), 0 deletions(-) >> >> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c >> index 52b4e97..8e4494c 100644 >> --- a/arch/x86/kvm/x86.c >> +++ b/arch/x86/kvm/x86.c >> @@ -6951,6 +6951,31 @@ static void memslot_set_lpage_disallowed(struct kvm_memory_slot *slot, >> } >> } >> >> +static void clear_memslot_lpage_info(struct kvm_memory_slot *slot) >> +{ >> + int i; >> + >> + for (i = 1; i < KVM_NR_PAGE_SIZES; ++i) { >> + int lpages; >> + int level = i + 1; >> + >> + lpages = gfn_to_index(slot->base_gfn + slot->npages - 1, >> + slot->base_gfn, level) + 1; >> + >> + memset(slot->arch.lpage_info[i - 1], 0, >> + sizeof(*slot->arch.lpage_info[i - 1])); >> + memslot_set_lpage_disallowed(slot, slot->npages, i, lpages); > > This does something other than clearing.
Aha, this API *clears* the count set by kvm mmu. It is meaningful enough, i think.
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