On Mon, 2007-07-23 at 19:16 +0800, Avi Kivity wrote:
> Shaohua Li wrote:
> > add a routine to zap all shadow pgtble for a gfn. If kvm supports
> SMP,
> > the API should zap pgtble for all vcpus, but kvm shadow page table
> > really should be per-vm, instead of per-vcpu.
> >
> >
>
> kvm shadow page tables _are_ per-vm. Current kvm.git even makes that
> more explicit where functions that remove stuff (like rmap_remove())
> don't require a vcpu.
Ok, I didn't check the latest kvm.git.
>
> > Index: linux/drivers/kvm/kvm.h
> > ===================================================================
> > --- linux.orig/drivers/kvm/kvm.h 2007-07-20 14:19:15.000000000
> +0800
> > +++ linux/drivers/kvm/kvm.h 2007-07-20 14:26:10.000000000 +0800
> > @@ -621,6 +621,7 @@ int kvm_mmu_unprotect_page_virt(struct k
> > void kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu);
> > int kvm_mmu_load(struct kvm_vcpu *vcpu);
> > void kvm_mmu_unload(struct kvm_vcpu *vcpu);
> > +void kvm_mmu_zap_pagetbl(struct kvm_vcpu *vcpu, u64 gfn);
> >
> > int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run);
> >
> > Index: linux/drivers/kvm/mmu.c
> > ===================================================================
> > --- linux.orig/drivers/kvm/mmu.c 2007-07-20 14:25:25.000000000
> +0800
> > +++ linux/drivers/kvm/mmu.c 2007-07-20 14:26:10.000000000 +0800
> > @@ -1324,6 +1324,34 @@ void kvm_mmu_zap_all(struct kvm_vcpu *vc
> > init_kvm_mmu(vcpu);
> > }
> >
> > +/* FIXME: this should zap all vcpu's shadow pgtbl for gfn */
> > +void kvm_mmu_zap_pagetbl(struct kvm_vcpu *vcpu, u64 gfn)
> > +{
> > + struct kvm *kvm = vcpu->kvm;
> > + struct kvm_rmap_desc *desc;
> > + struct page *page;
> > + u64 *spte;
> > +
> > + page = gfn_to_page(kvm, gfn);
> > + BUG_ON(!page);
> > +
> > + while (page_private(page)) {
> > + if (!(page_private(page) & 1))
> > + spte = (u64 *)page_private(page);
> > + else {
> > + desc = (struct kvm_rmap_desc
> *)(page_private(page) & ~1ul);
> > + spte = desc->shadow_ptes[0];
> > + }
> > + BUG_ON(!spte);
> > + BUG_ON((*spte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT
> > + != page_to_pfn(page));
> > + BUG_ON(!(*spte & PT_PRESENT_MASK));
> > + rmap_remove(vcpu, spte);
> > + *spte = 0;
> > + }
> > + kvm_flush_remote_tlbs(vcpu->kvm);
> > +}
> > +
>
> Suggest kvm_mmu_unmap_page() as a name for this.
ok.
Thanks,
Shaohua
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