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authorAxel Rasmussen <axelrasmussen@google.com>2021-05-19 13:03:39 -0700
committerPaolo Bonzini <pbonzini@redhat.com>2021-05-27 07:45:57 -0400
commit33090a884da5e9760f11441ac269f754375f80f5 (patch)
tree6e681d6e34d9b056ddd09381b8d877b670ed2807 /tools
parenta4b9722a5996017264feb19ebe86efe4380f7afb (diff)
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')
-rw-r--r--tools/testing/selftests/kvm/demand_paging_test.c6
-rw-r--r--tools/testing/selftests/kvm/include/test_util.h11
-rw-r--r--tools/testing/selftests/kvm/lib/kvm_util.c9
-rw-r--r--tools/testing/selftests/kvm/lib/test_util.c11
4 files changed, 33 insertions, 4 deletions
diff --git a/tools/testing/selftests/kvm/demand_paging_test.c b/tools/testing/selftests/kvm/demand_paging_test.c
index fcba527c29a6..b74704305835 100644
--- a/tools/testing/selftests/kvm/demand_paging_test.c
+++ b/tools/testing/selftests/kvm/demand_paging_test.c
@@ -484,8 +484,10 @@ int main(int argc, char *argv[])
}
}
- TEST_ASSERT(p.uffd_mode != UFFDIO_REGISTER_MODE_MINOR || p.src_type == VM_MEM_SRC_SHMEM,
- "userfaultfd MINOR mode requires shared memory; pick a different -t");
+ if (p.uffd_mode == UFFDIO_REGISTER_MODE_MINOR &&
+ !backing_src_is_shared(p.src_type)) {
+ TEST_FAIL("userfaultfd MINOR mode requires shared memory; pick a different -t");
+ }
for_each_guest_mode(run_test, &p);
diff --git a/tools/testing/selftests/kvm/include/test_util.h b/tools/testing/selftests/kvm/include/test_util.h
index 7377f00469ef..d79be15dd3d2 100644
--- a/tools/testing/selftests/kvm/include/test_util.h
+++ b/tools/testing/selftests/kvm/include/test_util.h
@@ -17,6 +17,7 @@
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
+#include <sys/mman.h>
#include "kselftest.h"
static inline int _no_printf(const char *format, ...) { return 0; }
@@ -85,6 +86,7 @@ enum vm_mem_backing_src_type {
VM_MEM_SRC_ANONYMOUS_HUGETLB_2GB,
VM_MEM_SRC_ANONYMOUS_HUGETLB_16GB,
VM_MEM_SRC_SHMEM,
+ VM_MEM_SRC_SHARED_HUGETLB,
NUM_SRC_TYPES,
};
@@ -101,4 +103,13 @@ size_t get_backing_src_pagesz(uint32_t i);
void backing_src_help(void);
enum vm_mem_backing_src_type parse_backing_src_type(const char *type_name);
+/*
+ * Whether or not the given source type is shared memory (as opposed to
+ * anonymous).
+ */
+static inline bool backing_src_is_shared(enum vm_mem_backing_src_type t)
+{
+ return vm_mem_backing_src_alias(t)->flag & MAP_SHARED;
+}
+
#endif /* SELFTEST_KVM_TEST_UTIL_H */
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);