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selftests: kvm: s390: Add s390x ucontrol test suite with hpage test

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Add test suite to validate the s390x architecture specific ucontrol KVM
interface.

Make use of the selftest test harness.

* uc_cap_hpage testcase verifies that a ucontrol VM cannot be run with
  hugepages.

To allow testing of the ucontrol interface the kernel needs a
non-default config containing CONFIG_KVM_S390_UCONTROL.
This config needs to be set to built-in (y) as this cannot be built as
module.

Signed-off-by: Christoph Schlameuss <schlameuss@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20240807154512.316936-4-schlameuss@linux.ibm.com
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Message-ID: <20240807154512.316936-4-schlameuss@linux.ibm.com>
This commit is contained in:
Christoph Schlameuss
2024-08-07 17:45:05 +02:00
committed by Janosch Frank
parent 845482188e
commit 011901fc22
4 changed files with 80 additions and 0 deletions
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1
tools/testing/selftests/kvm/.gitignore vendored
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@@ -5,3 +5,4 @@
!*.h
!*.S
!*.sh
!config

1
tools/testing/selftests/kvm/Makefile
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@@ -186,6 +186,7 @@ TEST_GEN_PROGS_s390x += s390x/tprot
TEST_GEN_PROGS_s390x += s390x/cmma_test
TEST_GEN_PROGS_s390x += s390x/debug_test
TEST_GEN_PROGS_s390x += s390x/shared_zeropage_test
TEST_GEN_PROGS_s390x += s390x/ucontrol_test
TEST_GEN_PROGS_s390x += demand_paging_test
TEST_GEN_PROGS_s390x += dirty_log_test
TEST_GEN_PROGS_s390x += guest_print_test

2
tools/testing/selftests/kvm/s390x/config Normal file
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@@ -0,0 +1,2 @@
CONFIG_KVM=y
CONFIG_KVM_S390_UCONTROL=y

76
tools/testing/selftests/kvm/s390x/ucontrol_test.c Normal file
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@@ -0,0 +1,76 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Test code for the s390x kvm ucontrol interface
*
* Copyright IBM Corp. 2024
*
* Authors:
* Christoph Schlameuss <schlameuss@linux.ibm.com>
*/
#include "kselftest_harness.h"
#include "kvm_util.h"
#include <linux/capability.h>
#include <linux/sizes.h>
/* so directly declare capget to check caps without libcap */
int capget(cap_user_header_t header, cap_user_data_t data);
/**
* In order to create user controlled virtual machines on S390,
* check KVM_CAP_S390_UCONTROL and use the flag KVM_VM_S390_UCONTROL
* as privileged user (SYS_ADMIN).
*/
void require_ucontrol_admin(void)
{
struct __user_cap_data_struct data[_LINUX_CAPABILITY_U32S_3];
struct __user_cap_header_struct hdr = {
.version = _LINUX_CAPABILITY_VERSION_3,
};
int rc;
rc = capget(&hdr, data);
TEST_ASSERT_EQ(0, rc);
TEST_REQUIRE((data->effective & CAP_TO_MASK(CAP_SYS_ADMIN)) > 0);
TEST_REQUIRE(kvm_has_cap(KVM_CAP_S390_UCONTROL));
}
/**
* Assert HPAGE CAP cannot be enabled on UCONTROL VM
*/
TEST(uc_cap_hpage)
{
int rc, kvm_fd, vm_fd, vcpu_fd;
struct kvm_enable_cap cap = {
.cap = KVM_CAP_S390_HPAGE_1M,
};
require_ucontrol_admin();
kvm_fd = open_kvm_dev_path_or_exit();
vm_fd = ioctl(kvm_fd, KVM_CREATE_VM, KVM_VM_S390_UCONTROL);
ASSERT_GE(vm_fd, 0);
/* assert hpages are not supported on ucontrol vm */
rc = ioctl(vm_fd, KVM_CHECK_EXTENSION, KVM_CAP_S390_HPAGE_1M);
EXPECT_EQ(0, rc);
/* Test that KVM_CAP_S390_HPAGE_1M can't be enabled for a ucontrol vm */
rc = ioctl(vm_fd, KVM_ENABLE_CAP, cap);
EXPECT_EQ(-1, rc);
EXPECT_EQ(EINVAL, errno);
/* assert HPAGE CAP is rejected after vCPU creation */
vcpu_fd = ioctl(vm_fd, KVM_CREATE_VCPU, 0);
ASSERT_GE(vcpu_fd, 0);
rc = ioctl(vm_fd, KVM_ENABLE_CAP, cap);
EXPECT_EQ(-1, rc);
EXPECT_EQ(EBUSY, errno);
close(vcpu_fd);
close(vm_fd);
close(kvm_fd);
}
TEST_HARNESS_MAIN