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Message-ID: <20230718234512.1690985-29-seanjc@google.com>
Date: Tue, 18 Jul 2023 16:45:11 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Paolo Bonzini <pbonzini@...hat.com>, Marc Zyngier <maz@...nel.org>,
Oliver Upton <oliver.upton@...ux.dev>,
Huacai Chen <chenhuacai@...nel.org>,
Michael Ellerman <mpe@...erman.id.au>,
Anup Patel <anup@...infault.org>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Sean Christopherson <seanjc@...gle.com>,
"Matthew Wilcox (Oracle)" <willy@...radead.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Paul Moore <paul@...l-moore.com>,
James Morris <jmorris@...ei.org>,
"Serge E. Hallyn" <serge@...lyn.com>
Cc: kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
kvmarm@...ts.linux.dev, linux-mips@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org, kvm-riscv@...ts.infradead.org,
linux-riscv@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
linux-mm@...ck.org, linux-security-module@...r.kernel.org,
linux-kernel@...r.kernel.org,
Chao Peng <chao.p.peng@...ux.intel.com>,
Fuad Tabba <tabba@...gle.com>,
Jarkko Sakkinen <jarkko@...nel.org>,
Yu Zhang <yu.c.zhang@...ux.intel.com>,
Vishal Annapurve <vannapurve@...gle.com>,
Ackerley Tng <ackerleytng@...gle.com>,
Maciej Szmigiero <mail@...iej.szmigiero.name>,
Vlastimil Babka <vbabka@...e.cz>,
David Hildenbrand <david@...hat.com>,
Quentin Perret <qperret@...gle.com>,
Michael Roth <michael.roth@....com>,
Wang <wei.w.wang@...el.com>,
Liam Merwick <liam.merwick@...cle.com>,
Isaku Yamahata <isaku.yamahata@...il.com>,
"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [RFC PATCH v11 28/29] KVM: selftests: Add basic selftest for guest_memfd()
Add a selftest to verify the basic functionality of guest_memfd():
+ file descriptor created with the guest_memfd() ioctl does not allow
read/write/mmap operations
+ file size and block size as returned from fstat are as expected
+ fallocate on the fd checks that offset/length on
fallocate(FALLOC_FL_PUNCH_HOLE) should be page aligned
Signed-off-by: Chao Peng <chao.p.peng@...ux.intel.com>
Co-developed-by: Ackerley Tng <ackerleytng@...gle.com>
Signed-off-by: Ackerley Tng <ackerleytng@...gle.com>
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
tools/testing/selftests/kvm/Makefile | 1 +
.../testing/selftests/kvm/guest_memfd_test.c | 114 ++++++++++++++++++
2 files changed, 115 insertions(+)
create mode 100644 tools/testing/selftests/kvm/guest_memfd_test.c
diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
index fdc7dff8d6ae..18c43336ede3 100644
--- a/tools/testing/selftests/kvm/Makefile
+++ b/tools/testing/selftests/kvm/Makefile
@@ -123,6 +123,7 @@ TEST_GEN_PROGS_x86_64 += access_tracking_perf_test
TEST_GEN_PROGS_x86_64 += demand_paging_test
TEST_GEN_PROGS_x86_64 += dirty_log_test
TEST_GEN_PROGS_x86_64 += dirty_log_perf_test
+TEST_GEN_PROGS_x86_64 += guest_memfd_test
TEST_GEN_PROGS_x86_64 += hardware_disable_test
TEST_GEN_PROGS_x86_64 += kvm_create_max_vcpus
TEST_GEN_PROGS_x86_64 += kvm_page_table_test
diff --git a/tools/testing/selftests/kvm/guest_memfd_test.c b/tools/testing/selftests/kvm/guest_memfd_test.c
new file mode 100644
index 000000000000..d698f9fde987
--- /dev/null
+++ b/tools/testing/selftests/kvm/guest_memfd_test.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright Intel Corporation, 2023
+ *
+ * Author: Chao Peng <chao.p.peng@...ux.intel.com>
+ */
+
+#define _GNU_SOURCE
+#include "test_util.h"
+#include "kvm_util_base.h"
+#include <linux/falloc.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <stdio.h>
+#include <fcntl.h>
+
+static void test_file_read_write(int fd)
+{
+ char buf[64];
+
+ TEST_ASSERT(read(fd, buf, sizeof(buf)) < 0,
+ "read on a guest_mem fd should fail");
+ TEST_ASSERT(write(fd, buf, sizeof(buf)) < 0,
+ "write on a guest_mem fd should fail");
+ TEST_ASSERT(pread(fd, buf, sizeof(buf), 0) < 0,
+ "pread on a guest_mem fd should fail");
+ TEST_ASSERT(pwrite(fd, buf, sizeof(buf), 0) < 0,
+ "pwrite on a guest_mem fd should fail");
+}
+
+static void test_mmap(int fd, size_t page_size)
+{
+ char *mem;
+
+ mem = mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+ ASSERT_EQ(mem, MAP_FAILED);
+}
+
+static void test_file_size(int fd, size_t page_size, size_t total_size)
+{
+ struct stat sb;
+ int ret;
+
+ ret = fstat(fd, &sb);
+ TEST_ASSERT(!ret, "fstat should succeed");
+ ASSERT_EQ(sb.st_size, total_size);
+ ASSERT_EQ(sb.st_blksize, page_size);
+}
+
+static void test_fallocate(int fd, size_t page_size, size_t total_size)
+{
+ int ret;
+
+ ret = fallocate(fd, FALLOC_FL_KEEP_SIZE, 0, total_size);
+ TEST_ASSERT(!ret, "fallocate with aligned offset and size should succeed");
+
+ ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
+ page_size - 1, page_size);
+ TEST_ASSERT(ret, "fallocate with unaligned offset should fail");
+
+ ret = fallocate(fd, FALLOC_FL_KEEP_SIZE, total_size, page_size);
+ TEST_ASSERT(ret, "fallocate beginning at total_size should fail");
+
+ ret = fallocate(fd, FALLOC_FL_KEEP_SIZE, total_size + page_size, page_size);
+ TEST_ASSERT(ret, "fallocate beginning at total_size should fail");
+
+ ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
+ total_size, page_size);
+ TEST_ASSERT(!ret, "fallocate(PUNCH_HOLE) at total_size should succeed");
+
+ ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
+ total_size + page_size, page_size);
+ TEST_ASSERT(!ret, "fallocate(PUNCH_HOLE) after total_size should succeed");
+
+ ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
+ page_size, page_size - 1);
+ TEST_ASSERT(ret, "fallocate with unaligned size should fail");
+
+ ret = fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,
+ page_size, page_size);
+ TEST_ASSERT(!ret, "fallocate(PUNCH_HOLE) with aligned offset and size should succeed");
+
+ ret = fallocate(fd, FALLOC_FL_KEEP_SIZE, page_size, page_size);
+ TEST_ASSERT(!ret, "fallocate to restore punched hole should succeed");
+}
+
+
+int main(int argc, char *argv[])
+{
+ size_t page_size;
+ size_t total_size;
+ int fd;
+ struct kvm_vm *vm;
+
+ page_size = getpagesize();
+ total_size = page_size * 4;
+
+ vm = vm_create_barebones();
+
+ fd = vm_create_guest_memfd(vm, total_size, 0);
+
+ test_file_read_write(fd);
+ test_mmap(fd, page_size);
+ test_file_size(fd, page_size, total_size);
+ test_fallocate(fd, page_size, total_size);
+
+ close(fd);
+}
--
2.41.0.255.g8b1d071c50-goog
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