linux-kernel - [RFC PATCH 26/26] selftests: add HugeTLB HGM to KVM demand paging selftest

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Message-Id: <20220624173656.2033256-27-jthoughton@google.com>
Date:   Fri, 24 Jun 2022 17:36:56 +0000
From:   James Houghton <jthoughton@...gle.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <songmuchun@...edance.com>,
        Peter Xu <peterx@...hat.com>
Cc:     David Hildenbrand <david@...hat.com>,
        David Rientjes <rientjes@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Mina Almasry <almasrymina@...gle.com>,
        Jue Wang <juew@...gle.com>,
        Manish Mishra <manish.mishra@...anix.com>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        James Houghton <jthoughton@...gle.com>
Subject: [RFC PATCH 26/26] selftests: add HugeTLB HGM to KVM demand paging selftest

This doesn't address collapsing yet, and it only works with the MINOR
mode (UFFDIO_CONTINUE).

Signed-off-by: James Houghton <jthoughton@...gle.com>
---
 tools/testing/selftests/kvm/include/test_util.h |  2 ++
 tools/testing/selftests/kvm/lib/kvm_util.c      |  2 +-
 tools/testing/selftests/kvm/lib/test_util.c     | 14 ++++++++++++++
 3 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/include/test_util.h b/tools/testing/selftests/kvm/include/test_util.h
index 99e0dcdc923f..6209e44981a7 100644
--- a/tools/testing/selftests/kvm/include/test_util.h
+++ b/tools/testing/selftests/kvm/include/test_util.h
@@ -87,6 +87,7 @@ enum vm_mem_backing_src_type {
 	VM_MEM_SRC_ANONYMOUS_HUGETLB_16GB,
 	VM_MEM_SRC_SHMEM,
 	VM_MEM_SRC_SHARED_HUGETLB,
+	VM_MEM_SRC_SHARED_HUGETLB_HGM,
 	NUM_SRC_TYPES,
 };
 
@@ -105,6 +106,7 @@ size_t get_def_hugetlb_pagesz(void);
 const struct vm_mem_backing_src_alias *vm_mem_backing_src_alias(uint32_t i);
 size_t get_backing_src_pagesz(uint32_t i);
 bool is_backing_src_hugetlb(uint32_t i);
+bool is_backing_src_shared_hugetlb(enum vm_mem_backing_src_type src_type);
 void backing_src_help(const char *flag);
 enum vm_mem_backing_src_type parse_backing_src_type(const char *type_name);
 long get_run_delay(void);
diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
index 1665a220abcb..382f8fb75b7f 100644
--- a/tools/testing/selftests/kvm/lib/kvm_util.c
+++ b/tools/testing/selftests/kvm/lib/kvm_util.c
@@ -993,7 +993,7 @@ void vm_userspace_mem_region_add(struct kvm_vm *vm,
 	region->fd = -1;
 	if (backing_src_is_shared(src_type))
 		region->fd = kvm_memfd_alloc(region->mmap_size,
-					     src_type == VM_MEM_SRC_SHARED_HUGETLB);
+				is_backing_src_shared_hugetlb(src_type));
 
 	region->mmap_start = mmap(NULL, region->mmap_size,
 				  PROT_READ | PROT_WRITE,
diff --git a/tools/testing/selftests/kvm/lib/test_util.c b/tools/testing/selftests/kvm/lib/test_util.c
index 6d23878bbfe1..710dc42077fe 100644
--- a/tools/testing/selftests/kvm/lib/test_util.c
+++ b/tools/testing/selftests/kvm/lib/test_util.c
@@ -254,6 +254,13 @@ const struct vm_mem_backing_src_alias *vm_mem_backing_src_alias(uint32_t i)
 			 */
 			.flag = MAP_SHARED,
 		},
+		[VM_MEM_SRC_SHARED_HUGETLB_HGM] = {
+			/*
+			 * Identical to shared_hugetlb except for the name.
+			 */
+			.name = "shared_hugetlb_hgm",
+			.flag = MAP_SHARED,
+		},
 	};
 	_Static_assert(ARRAY_SIZE(aliases) == NUM_SRC_TYPES,
 		       "Missing new backing src types?");
@@ -272,6 +279,7 @@ size_t get_backing_src_pagesz(uint32_t i)
 	switch (i) {
 	case VM_MEM_SRC_ANONYMOUS:
 	case VM_MEM_SRC_SHMEM:
+	case VM_MEM_SRC_SHARED_HUGETLB_HGM:
 		return getpagesize();
 	case VM_MEM_SRC_ANONYMOUS_THP:
 		return get_trans_hugepagesz();
@@ -288,6 +296,12 @@ bool is_backing_src_hugetlb(uint32_t i)
 	return !!(vm_mem_backing_src_alias(i)->flag & MAP_HUGETLB);
 }
 
+bool is_backing_src_shared_hugetlb(enum vm_mem_backing_src_type src_type)
+{
+	return src_type == VM_MEM_SRC_SHARED_HUGETLB ||
+		src_type == VM_MEM_SRC_SHARED_HUGETLB_HGM;
+}
+
 static void print_available_backing_src_types(const char *prefix)
 {
 	int i;
-- 
2.37.0.rc0.161.g10f37bed90-goog