linux-kernel - Re: [RFC PATCH v11 28/29] KVM: selftests: Add basic selftest for guest

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Date:   Mon, 07 Aug 2023 23:25:02 +0000
From:   Ackerley Tng <ackerleytng@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     pbonzini@...hat.com, maz@...nel.org, oliver.upton@...ux.dev,
        chenhuacai@...nel.org, mpe@...erman.id.au, anup@...infault.org,
        paul.walmsley@...ive.com, palmer@...belt.com,
        aou@...s.berkeley.edu, seanjc@...gle.com, willy@...radead.org,
        akpm@...ux-foundation.org, paul@...l-moore.com, jmorris@...ei.org,
        serge@...lyn.com, 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.p.peng@...ux.intel.com,
        tabba@...gle.com, jarkko@...nel.org, yu.c.zhang@...ux.intel.com,
        vannapurve@...gle.com, mail@...iej.szmigiero.name, vbabka@...e.cz,
        david@...hat.com, qperret@...gle.com, michael.roth@....com,
        wei.w.wang@...el.com, liam.merwick@...cle.com,
        isaku.yamahata@...il.com, kirill.shutemov@...ux.intel.com
Subject: Re: [RFC PATCH v11 28/29] KVM: selftests: Add basic selftest for guest_memfd()

Sean Christopherson <seanjc@...gle.com> writes:

> Add a selftest to verify the basic functionality of guest_memfd():
>
> <snip>

Here's one more test:

>From 72dc6836f01bdd613d64d4c6a4f2af8f2b777ba2 Mon Sep 17 00:00:00 2001
From: Ackerley Tng <ackerleytng@...gle.com>
Date: Tue, 1 Aug 2023 18:02:50 +0000
Subject: [PATCH] KVM: selftests: Add tests - invalid inputs for
 KVM_CREATE_GUEST_MEMFD

Test that invalid inputs for KVM_CREATE_GUEST_MEMFD, such as
non-page-aligned page size and invalid flags, are rejected by the
KVM_CREATE_GUEST_MEMFD with EINVAL

Signed-off-by: Ackerley Tng <ackerleytng@...gle.com>
---
 tools/testing/selftests/kvm/guest_memfd_test.c  | 17 +++++++++++++++++
 .../selftests/kvm/include/kvm_util_base.h       | 11 +++++++++--
 2 files changed, 26 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/kvm/guest_memfd_test.c b/tools/testing/selftests/kvm/guest_memfd_test.c
index eb93c608a7e0..ad20f11b2d2c 100644
--- a/tools/testing/selftests/kvm/guest_memfd_test.c
+++ b/tools/testing/selftests/kvm/guest_memfd_test.c
@@ -90,6 +90,21 @@ static void test_fallocate(int fd, size_t page_size, size_t total_size)
 	TEST_ASSERT(!ret, "fallocate to restore punched hole should succeed");
 }
 
+static void test_create_guest_memfd_invalid(struct kvm_vm *vm, size_t page_size)
+{
+	int fd;
+
+	/* Non-page-aligned page_size */
+	fd = __vm_create_guest_memfd(vm, 1, 0);
+	ASSERT_EQ(fd, -1);
+	ASSERT_EQ(errno, EINVAL);
+
+	/* Invalid flags */
+	fd = __vm_create_guest_memfd(vm, page_size, 99);
+	ASSERT_EQ(fd, -1);
+	ASSERT_EQ(errno, EINVAL);
+}
+
 
 int main(int argc, char *argv[])
 {
@@ -103,6 +118,8 @@ int main(int argc, char *argv[])
 
 	vm = vm_create_barebones();
 
+	test_create_guest_memfd_invalid(vm, page_size);
+
 	fd = vm_create_guest_memfd(vm, total_size, 0);
 
 	test_file_read_write(fd);
diff --git a/tools/testing/selftests/kvm/include/kvm_util_base.h b/tools/testing/selftests/kvm/include/kvm_util_base.h
index 39b38c75b99c..8bdfadd72349 100644
--- a/tools/testing/selftests/kvm/include/kvm_util_base.h
+++ b/tools/testing/selftests/kvm/include/kvm_util_base.h
@@ -474,7 +474,8 @@ static inline uint64_t vm_get_stat(struct kvm_vm *vm, const char *stat_name)
 }
 
 void vm_create_irqchip(struct kvm_vm *vm);
-static inline int vm_create_guest_memfd(struct kvm_vm *vm, uint64_t size,
+
+static inline int __vm_create_guest_memfd(struct kvm_vm *vm, uint64_t size,
 					uint64_t flags)
 {
 	struct kvm_create_guest_memfd gmem = {
@@ -482,7 +483,13 @@ static inline int vm_create_guest_memfd(struct kvm_vm *vm, uint64_t size,
 		.flags = flags,
 	};
 
-	int fd = __vm_ioctl(vm, KVM_CREATE_GUEST_MEMFD, &gmem);
+	return __vm_ioctl(vm, KVM_CREATE_GUEST_MEMFD, &gmem);
+}
+
+static inline int vm_create_guest_memfd(struct kvm_vm *vm, uint64_t size,
+					uint64_t flags)
+{
+	int fd = __vm_create_guest_memfd(vm, size, flags);
 
 	TEST_ASSERT(fd >= 0, KVM_IOCTL_ERROR(KVM_CREATE_GUEST_MEMFD, fd));
 	return fd;
-- 
2.41.0.640.ga95def55d0-goog