On Sat, 2022-10-29 at 23:22 -0700, isaku.yamahata@xxxxxxxxx wrote: > From: Isaku Yamahata <isaku.yamahata@xxxxxxxxx> > > FNAME(sync_page) in arch/x86/kvm/mmu/paging_tmpl.h assumes that the initial > shadow page table entry (SPTE) is zero. Remove the assumption by using > SHADOW_NONPRESENT_VALUE that will be updated from 0 to non-zero value. > > Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx> > --- > arch/x86/kvm/mmu/paging_tmpl.h | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h > index 5ab5f94dcb6f..6db3f2b5563a 100644 > --- a/arch/x86/kvm/mmu/paging_tmpl.h > +++ b/arch/x86/kvm/mmu/paging_tmpl.h > @@ -1036,7 +1036,8 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) > gpa_t pte_gpa; > gfn_t gfn; > > - if (!sp->spt[i]) > + /* spt[i] has initial value of shadow page table allocation */ > + if (sp->spt[i] == SHADOW_NONPRESENT_VALUE) > continue; > > pte_gpa = first_pte_gpa + i * sizeof(pt_element_t); I think this patch can be merged to previous one? Looks there's no good reason to keep it as standalone.
