From: Ackerley Tng ackerleytng@google.com
One-to-one GVA to GPA mappings can be used in the guest to set up boot sequences during which paging is enabled, hence requiring a transition from using physical to virtual addresses in consecutive instructions.
Signed-off-by: Ackerley Tng ackerleytng@google.com Signed-off-by: Sagi Shahar sagis@google.com --- .../testing/selftests/kvm/include/kvm_util.h | 3 +++ tools/testing/selftests/kvm/lib/kvm_util.c | 27 +++++++++++++++---- 2 files changed, 25 insertions(+), 5 deletions(-)
diff --git a/tools/testing/selftests/kvm/include/kvm_util.h b/tools/testing/selftests/kvm/include/kvm_util.h index bee65ca08721..9994861d2acb 100644 --- a/tools/testing/selftests/kvm/include/kvm_util.h +++ b/tools/testing/selftests/kvm/include/kvm_util.h @@ -650,6 +650,9 @@ vm_vaddr_t __vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min, vm_vaddr_t vm_vaddr_alloc_shared(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min, enum kvm_mem_region_type type); +vm_vaddr_t vm_vaddr_identity_alloc(struct kvm_vm *vm, size_t sz, + vm_vaddr_t vaddr_min, + enum kvm_mem_region_type type); vm_vaddr_t vm_vaddr_alloc_pages(struct kvm_vm *vm, int nr_pages); vm_vaddr_t __vm_vaddr_alloc_page(struct kvm_vm *vm, enum kvm_mem_region_type type); diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index a055343a7bf7..8f3dbf749afa 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -1460,15 +1460,14 @@ vm_vaddr_t vm_vaddr_unused_gap(struct kvm_vm *vm, size_t sz, }
static vm_vaddr_t ____vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, - vm_vaddr_t vaddr_min, + vm_vaddr_t vaddr_min, vm_paddr_t paddr_min, enum kvm_mem_region_type type, bool protected) { uint64_t pages = (sz >> vm->page_shift) + ((sz % vm->page_size) != 0);
virt_pgd_alloc(vm); - vm_paddr_t paddr = __vm_phy_pages_alloc(vm, pages, - KVM_UTIL_MIN_PFN * vm->page_size, + vm_paddr_t paddr = __vm_phy_pages_alloc(vm, pages, paddr_min, vm->memslots[type], protected);
/* @@ -1492,7 +1491,7 @@ static vm_vaddr_t ____vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t __vm_vaddr_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min, enum kvm_mem_region_type type) { - return ____vm_vaddr_alloc(vm, sz, vaddr_min, type, + return ____vm_vaddr_alloc(vm, sz, vaddr_min, KVM_UTIL_MIN_PFN * vm->page_size, type, vm_arch_has_protected_memory(vm)); }
@@ -1500,7 +1499,25 @@ vm_vaddr_t vm_vaddr_alloc_shared(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min, enum kvm_mem_region_type type) { - return ____vm_vaddr_alloc(vm, sz, vaddr_min, type, false); + return ____vm_vaddr_alloc(vm, sz, vaddr_min, KVM_UTIL_MIN_PFN * vm->page_size, type, false); +} + +/* + * Allocate memory in @vm of size @sz beginning with the desired virtual address + * of @vaddr_min and backed by physical address equal to returned virtual + * address. + * + * Return the address where the memory is allocated. + */ +vm_vaddr_t vm_vaddr_identity_alloc(struct kvm_vm *vm, size_t sz, vm_vaddr_t vaddr_min, + enum kvm_mem_region_type type) +{ + vm_vaddr_t gva = ____vm_vaddr_alloc(vm, sz, vaddr_min, + (vm_paddr_t)vaddr_min, type, + vm_arch_has_protected_memory(vm)); + TEST_ASSERT_EQ(gva, addr_gva2gpa(vm, gva)); + + return gva; }
/*