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Message-ID: <b68e77305a8cf74a1d54c86e245c778154961f61.1747264138.git.ackerleytng@google.com>
Date: Wed, 14 May 2025 16:42:24 -0700
From: Ackerley Tng <ackerleytng@...gle.com>
To: kvm@...r.kernel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
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Subject: [RFC PATCH v2 45/51] KVM: selftests: Test allocation and conversion
of subfolios
This patch adds tests for allocation and conversion of subfolios in a
large folio.
Change-Id: I37035b2c24398e2c83a2ac5a46b4e6ceed2a8b53
Signed-off-by: Ackerley Tng <ackerleytng@...gle.com>
---
.../kvm/guest_memfd_conversions_test.c | 88 +++++++++++++++++++
1 file changed, 88 insertions(+)
diff --git a/tools/testing/selftests/kvm/guest_memfd_conversions_test.c b/tools/testing/selftests/kvm/guest_memfd_conversions_test.c
index 435f91424d5f..c31d1abd1b93 100644
--- a/tools/testing/selftests/kvm/guest_memfd_conversions_test.c
+++ b/tools/testing/selftests/kvm/guest_memfd_conversions_test.c
@@ -672,6 +672,92 @@ static void test_close_with_pinning(size_t test_page_size)
__test_close_with_pinning(test_page_size, false);
}
+static void test_allocate_subfolios(size_t test_page_size)
+{
+ struct kvm_vcpu *vcpu;
+ struct kvm_vm *vm;
+ size_t increment;
+ int guest_memfd;
+ size_t nr_pages;
+ char *mem;
+ int i;
+
+ if (test_page_size == PAGE_SIZE)
+ return;
+
+ vm = setup_test(test_page_size, /*init_private=*/false, &vcpu,
+ &guest_memfd, &mem);
+
+ nr_pages = test_page_size / PAGE_SIZE;
+
+ /*
+ * Loop backwards to check allocation of the correct subfolio within the
+ * huge folio. If it were allocated wrongly, the second loop would error
+ * out because one or more of the checks would be wrong.
+ */
+ increment = nr_pages >> 1;
+ for (i = nr_pages - 1; i >= 0; i -= increment)
+ host_use_memory(mem + i * PAGE_SIZE, 'X', 'A' + i);
+ for (i = nr_pages - 1; i >= 0; i -= increment)
+ host_use_memory(mem + i * PAGE_SIZE, 'A' + i, 'A' + i);
+
+ cleanup_test(test_page_size, vm, guest_memfd, mem);
+}
+
+static void test_convert_subfolios(size_t test_page_size)
+{
+ struct kvm_vcpu *vcpu;
+ struct kvm_vm *vm;
+ size_t increment;
+ int guest_memfd;
+ size_t nr_pages;
+ int to_convert;
+ char *mem;
+ int i;
+
+ if (test_page_size == PAGE_SIZE)
+ return;
+
+ vm = setup_test(test_page_size, /*init_private=*/true, &vcpu,
+ &guest_memfd, &mem);
+
+ nr_pages = test_page_size / PAGE_SIZE;
+
+ increment = nr_pages >> 1;
+ for (i = 0; i < nr_pages; i += increment) {
+ guest_use_memory(vcpu,
+ GUEST_MEMFD_SHARING_TEST_GVA + i * PAGE_SIZE,
+ 'X', 'A', 0);
+ assert_host_cannot_fault(mem + i * PAGE_SIZE);
+ }
+
+ to_convert = round_up(nr_pages / 2, increment);
+ guest_memfd_convert_shared(guest_memfd, to_convert * PAGE_SIZE, PAGE_SIZE);
+
+
+ for (i = 0; i < nr_pages; i += increment) {
+ if (i == to_convert)
+ host_use_memory(mem + i * PAGE_SIZE, 'A', 'B');
+ else
+ assert_host_cannot_fault(mem + i * PAGE_SIZE);
+
+ guest_use_memory(vcpu,
+ GUEST_MEMFD_SHARING_TEST_GVA + i * PAGE_SIZE,
+ 'X', 'B', 0);
+ }
+
+ guest_memfd_convert_private(guest_memfd, to_convert * PAGE_SIZE, PAGE_SIZE);
+
+ for (i = 0; i < nr_pages; i += increment) {
+ guest_use_memory(vcpu,
+ GUEST_MEMFD_SHARING_TEST_GVA + i * PAGE_SIZE,
+ 'B', 'C', 0);
+ assert_host_cannot_fault(mem + i * PAGE_SIZE);
+ }
+
+ cleanup_test(test_page_size, vm, guest_memfd, mem);
+}
+
static void test_with_size(size_t test_page_size)
{
test_sharing(test_page_size);
@@ -685,6 +771,8 @@ static void test_with_size(size_t test_page_size)
test_truncate_shared_while_pinned(test_page_size);
test_truncate_private(test_page_size);
test_close_with_pinning(test_page_size);
+ test_allocate_subfolios(test_page_size);
+ test_convert_subfolios(test_page_size);
}
int main(int argc, char *argv[])
--
2.49.0.1045.g170613ef41-goog
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