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| author | Axel Rasmussen <axelrasmussen@google.com> | 2021-05-19 23:03:39 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-05-27 14:45:57 +0300 |
| commit | 33090a884da5e9760f11441ac269f754375f80f5 (patch) | |
| tree | 6e681d6e34d9b056ddd09381b8d877b670ed2807 /tools/testing/selftests/kvm/lib | |
| parent | a4b9722a5996017264feb19ebe86efe4380f7afb (diff) | |
| download | linux-33090a884da5e9760f11441ac269f754375f80f5.tar.xz | |
KVM: selftests: add shared hugetlbfs backing source type
This lets us run the demand paging test on top of a shared
hugetlbfs-backed area. The "shared" is key, as this allows us to
exercise userfaultfd minor faults on hugetlbfs.
Signed-off-by: Axel Rasmussen <axelrasmussen@google.com>
Message-Id: <20210519200339.829146-11-axelrasmussen@google.com>
Reviewed-by: Ben Gardon <bgardon@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'tools/testing/selftests/kvm/lib')
| -rw-r--r-- | tools/testing/selftests/kvm/lib/kvm_util.c | 9 | ||||
| -rw-r--r-- | tools/testing/selftests/kvm/lib/test_util.c | 11 |
2 files changed, 18 insertions, 2 deletions
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c index f62780719176..28e528c19d28 100644 --- a/tools/testing/selftests/kvm/lib/kvm_util.c +++ b/tools/testing/selftests/kvm/lib/kvm_util.c @@ -848,8 +848,13 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm, region->mmap_size += alignment; region->fd = -1; - if (src_type == VM_MEM_SRC_SHMEM) { - region->fd = memfd_create("kvm_selftest", MFD_CLOEXEC); + if (backing_src_is_shared(src_type)) { + int memfd_flags = MFD_CLOEXEC; + + if (src_type == VM_MEM_SRC_SHARED_HUGETLB) + memfd_flags |= MFD_HUGETLB; + + region->fd = memfd_create("kvm_selftest", memfd_flags); TEST_ASSERT(region->fd != -1, "memfd_create failed, errno: %i", errno); diff --git a/tools/testing/selftests/kvm/lib/test_util.c b/tools/testing/selftests/kvm/lib/test_util.c index c7a265da5090..6ad6c8276b2e 100644 --- a/tools/testing/selftests/kvm/lib/test_util.c +++ b/tools/testing/selftests/kvm/lib/test_util.c @@ -240,6 +240,16 @@ const struct vm_mem_backing_src_alias *vm_mem_backing_src_alias(uint32_t i) .name = "shmem", .flag = MAP_SHARED, }, + [VM_MEM_SRC_SHARED_HUGETLB] = { + .name = "shared_hugetlb", + /* + * No MAP_HUGETLB, we use MFD_HUGETLB instead. Since + * we're using "file backed" memory, we need to specify + * this when the FD is created, not when the area is + * mapped. + */ + .flag = MAP_SHARED, + }, }; _Static_assert(ARRAY_SIZE(aliases) == NUM_SRC_TYPES, "Missing new backing src types?"); @@ -262,6 +272,7 @@ size_t get_backing_src_pagesz(uint32_t i) case VM_MEM_SRC_ANONYMOUS_THP: return get_trans_hugepagesz(); case VM_MEM_SRC_ANONYMOUS_HUGETLB: + case VM_MEM_SRC_SHARED_HUGETLB: return get_def_hugetlb_pagesz(); default: return MAP_HUGE_PAGE_SIZE(flag); |