Gregory Haskins wrote:
+/*
+ * ------------
+ * XINTERFACE (External Interface)
+ * -------------
+ */
+
+static struct kvm *
+intf_to_kvm(struct kvm_xinterface *intf)
+{
+ return container_of(intf, struct kvm, xinterface);
+}
+
+static unsigned long
+xinterface_gpa_to_hva(struct kvm_xinterface *intf, unsigned long gpa)
+{
+ struct kvm *kvm = intf_to_kvm(intf);
+ unsigned long addr;
+
+ addr = gfn_to_hva(kvm, gpa >> PAGE_SHIFT);
+ if (kvm_is_error_hva(addr))
+ return 0;
+
+ return addr + offset_in_page(gpa);
+}
+
+static struct page *
+xinterface_gpa_to_page(struct kvm_xinterface *intf, unsigned long gpa)
+{
+ struct kvm *kvm = intf_to_kvm(intf);
+ struct page *page;
+
+ page = gfn_to_page(kvm, gpa >> PAGE_SHIFT);
+ if (page == bad_page)
+ return ERR_PTR(-EINVAL);
+
+ return page;
+}
+
+static void
+xinterface_release(struct kvm_xinterface *intf)
+{
+ struct kvm *kvm = intf_to_kvm(intf);
+
+ kvm_put_kvm(kvm);
+}
+
+struct kvm_xinterface_ops _kvm_xinterface_ops = {
+ .gpa_to_hva = xinterface_gpa_to_hva,
+ .gpa_to_page = xinterface_gpa_to_page,
+ .release = xinterface_release,
+};
How do you deal with locking?
The mappings (gpa_to_page) are not fixed. They can and do change very
often. The interface doesn't seem to attempt to cope with this.
Regards,
Anthony Liguori
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