KVM: Device Assignment: Map mmio pages into VT-d page table

Assigned device could DMA to mmio pages, so also need to map mmio pages
into VT-d page table.
Signed-off-by: Weidong Han <weidong.han@intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/x86/kvm/vtd.c

@@ -36,37 +36,30 @@ int kvm_iommu_map_pages(struct kvm *kvm,
 {
 	gfn_t gfn = base_gfn;
 	pfn_t pfn;
-	int i, r;
+	int i, r = 0;
 	struct dmar_domain *domain = kvm->arch.intel_iommu_domain;
 
 	/* check if iommu exists and in use */
 	if (!domain)
 		return 0;
 
-	r = -EINVAL;
 	for (i = 0; i < npages; i++) {
 		/* check if already mapped */
 		pfn = (pfn_t)intel_iommu_iova_to_pfn(domain,
 						     gfn_to_gpa(gfn));
-		if (pfn && !is_mmio_pfn(pfn))
+		if (pfn)
 			continue;
 
 		pfn = gfn_to_pfn(kvm, gfn);
-		if (!is_mmio_pfn(pfn)) {
-			r = intel_iommu_page_mapping(domain,
-						     gfn_to_gpa(gfn),
-						     pfn_to_hpa(pfn),
-						     PAGE_SIZE,
-						     DMA_PTE_READ |
-						     DMA_PTE_WRITE);
-			if (r) {
-				printk(KERN_DEBUG "kvm_iommu_map_pages:"
-				       "iommu failed to map pfn=%lx\n", pfn);
-				goto unmap_pages;
-			}
-		} else {
-			printk(KERN_DEBUG "kvm_iommu_map_page:"
-			       "invalid pfn=%lx\n", pfn);
+		r = intel_iommu_page_mapping(domain,
+					     gfn_to_gpa(gfn),
+					     pfn_to_hpa(pfn),
+					     PAGE_SIZE,
+					     DMA_PTE_READ |
+					     DMA_PTE_WRITE);
+		if (r) {
+			printk(KERN_ERR "kvm_iommu_map_pages:"
+			       "iommu failed to map pfn=%lx\n", pfn);
 			goto unmap_pages;
 		}
 		gfn++;

include/asm-x86/kvm_host.h

@@ -502,8 +502,6 @@ int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
 int kvm_pv_mmu_op(struct kvm_vcpu *vcpu, unsigned long bytes,
 		  gpa_t addr, unsigned long *ret);
 
-int is_mmio_pfn(pfn_t pfn);
-
 extern bool tdp_enabled;
 
 enum emulation_result {

virt/kvm/kvm_main.c

@@ -76,7 +76,7 @@ static inline int valid_vcpu(int n)
 	return likely(n >= 0 && n < KVM_MAX_VCPUS);
 }
 
-inline int is_mmio_pfn(pfn_t pfn)
+static inline int is_mmio_pfn(pfn_t pfn)
 {
 	if (pfn_valid(pfn))
 		return PageReserved(pfn_to_page(pfn));