[5/7] KVM: selftests: Add util to delete memory region
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Message ID 20200320205546.2396-6-sean.j.christopherson@intel.com
State New
Headers show
Series
  • KVM: Fix memslot use-after-free bug
Related show

Commit Message

Sean Christopherson March 20, 2020, 8:55 p.m. UTC
Add a utility to delete a memory region, it will be used by x86's
set_memory_region_test.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 .../testing/selftests/kvm/include/kvm_util.h  |  1 +
 tools/testing/selftests/kvm/lib/kvm_util.c    | 60 ++++++++++++-------
 2 files changed, 40 insertions(+), 21 deletions(-)

Patch
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diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h
index a99b875f50d2..0f0e86e188c4 100644
--- a/tools/testing/selftests/kvm/include/kvm_util.h
+++ b/tools/testing/selftests/kvm/include/kvm_util.h
@@ -113,6 +113,7 @@  int _vcpu_ioctl(struct kvm_vm *vm, uint32_t vcpuid, unsigned long ioctl,
 void vm_ioctl(struct kvm_vm *vm, unsigned long ioctl, void *arg);
 void vm_mem_region_set_flags(struct kvm_vm *vm, uint32_t slot, uint32_t flags);
 void vm_mem_region_move(struct kvm_vm *vm, uint32_t slot, uint64_t new_gpa);
+void vm_mem_region_delete(struct kvm_vm *vm, uint32_t slot);
 void vm_vcpu_add(struct kvm_vm *vm, uint32_t vcpuid);
 vm_vaddr_t vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min,
 			  uint32_t data_memslot, uint32_t pgd_memslot);
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index d7b74f465570..f69fa84c9a4c 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -451,36 +451,36 @@  void kvm_vm_release(struct kvm_vm *vmp)
 		"  vmp->kvm_fd: %i rc: %i errno: %i", vmp->kvm_fd, ret, errno);
 }
 
+static void __vm_mem_region_delete(struct kvm_vm *vm,
+				   struct userspace_mem_region *region)
+{
+	int ret;
+
+	kvm_list_del(vm->userspace_mem_region_head, region);
+
+	region->region.memory_size = 0;
+	ret = ioctl(vm->fd, KVM_SET_USER_MEMORY_REGION, &region->region);
+	TEST_ASSERT(ret == 0, "KVM_SET_USER_MEMORY_REGION IOCTL failed, "
+		    "rc: %i errno: %i", ret, errno);
+
+	sparsebit_free(&region->unused_phy_pages);
+	ret = munmap(region->mmap_start, region->mmap_size);
+	TEST_ASSERT(ret == 0, "munmap failed, rc: %i errno: %i", ret, errno);
+
+	free(region);
+}
+
 /*
  * Destroys and frees the VM pointed to by vmp.
  */
 void kvm_vm_free(struct kvm_vm *vmp)
 {
-	int ret;
-
 	if (vmp == NULL)
 		return;
 
 	/* Free userspace_mem_regions. */
-	while (vmp->userspace_mem_region_head) {
-		struct userspace_mem_region *region
-			= vmp->userspace_mem_region_head;
-
-		kvm_list_del(vmp->userspace_mem_region_head, region);
-
-		region->region.memory_size = 0;
-		ret = ioctl(vmp->fd, KVM_SET_USER_MEMORY_REGION,
-			&region->region);
-		TEST_ASSERT(ret == 0, "KVM_SET_USER_MEMORY_REGION IOCTL failed, "
-			"rc: %i errno: %i", ret, errno);
-
-		sparsebit_free(&region->unused_phy_pages);
-		ret = munmap(region->mmap_start, region->mmap_size);
-		TEST_ASSERT(ret == 0, "munmap failed, rc: %i errno: %i",
-			    ret, errno);
-
-		free(region);
-	}
+	while (vmp->userspace_mem_region_head)
+		__vm_mem_region_delete(vmp, vmp->userspace_mem_region_head);
 
 	/* Free sparsebit arrays. */
 	sparsebit_free(&vmp->vpages_valid);
@@ -797,6 +797,24 @@  void vm_mem_region_move(struct kvm_vm *vm, uint32_t slot, uint64_t new_gpa)
 		    ret, errno, slot, new_gpa);
 }
 
+/*
+ * VM Memory Region Delete
+ *
+ * Input Args:
+ *   vm - Virtual Machine
+ *   slot - Slot of the memory region to delete
+ *
+ * Output Args: None
+ *
+ * Return: None
+ *
+ * Delete a memory region.
+ */
+void vm_mem_region_delete(struct kvm_vm *vm, uint32_t slot)
+{
+	__vm_mem_region_delete(vm, memslot2region(vm, slot));
+}
+
 /*
  * VCPU mmap Size
  *