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SubjectRe: [PATCH v3] KVM: selftests: Add a test for the KVM_S390_MEM_OP ioctl
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On 29.08.19 15:07, Thomas Huth wrote:
> Check that we can write and read the guest memory with this s390x
> ioctl, and that some error cases are handled correctly.
>
> Signed-off-by: Thomas Huth <thuth@redhat.com>
> ---
> v3:
> - Replaced wrong copy-n-pasted report string with a proper one
> - Check for errno after calling the ioctl with size = 0

the test succeeds (as the vmalloc fails) but dmesg then has the warning.
Do we have a chance to parse dmesg somehow?

I will apply this nevertheless for the time being together with the fix.


>
> tools/testing/selftests/kvm/Makefile | 1 +
> tools/testing/selftests/kvm/s390x/memop.c | 166 ++++++++++++++++++++++
> 2 files changed, 167 insertions(+)
> create mode 100644 tools/testing/selftests/kvm/s390x/memop.c
>
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index 1b48a94b4350..62c591f87dab 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -32,6 +32,7 @@ TEST_GEN_PROGS_aarch64 += clear_dirty_log_test
> TEST_GEN_PROGS_aarch64 += dirty_log_test
> TEST_GEN_PROGS_aarch64 += kvm_create_max_vcpus
>
> +TEST_GEN_PROGS_s390x = s390x/memop
> TEST_GEN_PROGS_s390x += s390x/sync_regs_test
> TEST_GEN_PROGS_s390x += dirty_log_test
> TEST_GEN_PROGS_s390x += kvm_create_max_vcpus
> diff --git a/tools/testing/selftests/kvm/s390x/memop.c b/tools/testing/selftests/kvm/s390x/memop.c
> new file mode 100644
> index 000000000000..9edaa9a134ce
> --- /dev/null
> +++ b/tools/testing/selftests/kvm/s390x/memop.c
> @@ -0,0 +1,166 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Test for s390x KVM_S390_MEM_OP
> + *
> + * Copyright (C) 2019, Red Hat, Inc.
> + */
> +
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <sys/ioctl.h>
> +
> +#include "test_util.h"
> +#include "kvm_util.h"
> +
> +#define VCPU_ID 1
> +
> +static uint8_t mem1[65536];
> +static uint8_t mem2[65536];
> +
> +static void guest_code(void)
> +{
> + int i;
> +
> + for (;;) {
> + for (i = 0; i < sizeof(mem2); i++)
> + mem2[i] = mem1[i];
> + GUEST_SYNC(0);
> + }
> +}
> +
> +int main(int argc, char *argv[])
> +{
> + struct kvm_vm *vm;
> + struct kvm_run *run;
> + struct kvm_s390_mem_op ksmo;
> + int rv, i, maxsize;
> +
> + setbuf(stdout, NULL); /* Tell stdout not to buffer its content */
> +
> + maxsize = kvm_check_cap(KVM_CAP_S390_MEM_OP);
> + if (!maxsize) {
> + fprintf(stderr, "CAP_S390_MEM_OP not supported -> skip test\n");
> + exit(KSFT_SKIP);
> + }
> + if (maxsize > sizeof(mem1))
> + maxsize = sizeof(mem1);
> +
> + /* Create VM */
> + vm = vm_create_default(VCPU_ID, 0, guest_code);
> + run = vcpu_state(vm, VCPU_ID);
> +
> + for (i = 0; i < sizeof(mem1); i++)
> + mem1[i] = i * i + i;
> +
> + /* Set the first array */
> + ksmo.gaddr = addr_gva2gpa(vm, (uintptr_t)mem1);
> + ksmo.flags = 0;
> + ksmo.size = maxsize;
> + ksmo.op = KVM_S390_MEMOP_LOGICAL_WRITE;
> + ksmo.buf = (uintptr_t)mem1;
> + ksmo.ar = 0;
> + vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
> +
> + /* Let the guest code copy the first array to the second */
> + vcpu_run(vm, VCPU_ID);
> + TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC,
> + "Unexpected exit reason: %u (%s)\n",
> + run->exit_reason,
> + exit_reason_str(run->exit_reason));
> +
> + memset(mem2, 0xaa, sizeof(mem2));
> +
> + /* Get the second array */
> + ksmo.gaddr = (uintptr_t)mem2;
> + ksmo.flags = 0;
> + ksmo.size = maxsize;
> + ksmo.op = KVM_S390_MEMOP_LOGICAL_READ;
> + ksmo.buf = (uintptr_t)mem2;
> + ksmo.ar = 0;
> + vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
> +
> + TEST_ASSERT(!memcmp(mem1, mem2, maxsize),
> + "Memory contents do not match!");
> +
> + /* Check error conditions - first bad size: */
> + ksmo.gaddr = (uintptr_t)mem1;
> + ksmo.flags = 0;
> + ksmo.size = -1;
> + ksmo.op = KVM_S390_MEMOP_LOGICAL_WRITE;
> + ksmo.buf = (uintptr_t)mem1;
> + ksmo.ar = 0;
> + rv = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
> + TEST_ASSERT(rv == -1 && errno == E2BIG, "ioctl allows insane sizes");
> +
> + /* Zero size: */
> + ksmo.gaddr = (uintptr_t)mem1;
> + ksmo.flags = 0;
> + ksmo.size = 0;
> + ksmo.op = KVM_S390_MEMOP_LOGICAL_WRITE;
> + ksmo.buf = (uintptr_t)mem1;
> + ksmo.ar = 0;
> + rv = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
> + TEST_ASSERT(rv == -1 && (errno == EINVAL || errno == ENOMEM),
> + "ioctl allows 0 as size");
> +
> + /* Bad flags: */
> + ksmo.gaddr = (uintptr_t)mem1;
> + ksmo.flags = -1;
> + ksmo.size = maxsize;
> + ksmo.op = KVM_S390_MEMOP_LOGICAL_WRITE;
> + ksmo.buf = (uintptr_t)mem1;
> + ksmo.ar = 0;
> + rv = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
> + TEST_ASSERT(rv == -1 && errno == EINVAL, "ioctl allows all flags");
> +
> + /* Bad operation: */
> + ksmo.gaddr = (uintptr_t)mem1;
> + ksmo.flags = 0;
> + ksmo.size = maxsize;
> + ksmo.op = -1;
> + ksmo.buf = (uintptr_t)mem1;
> + ksmo.ar = 0;
> + rv = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
> + TEST_ASSERT(rv == -1 && errno == EINVAL, "ioctl allows bad operations");
> +
> + /* Bad guest address: */
> + ksmo.gaddr = ~0xfffUL;
> + ksmo.flags = KVM_S390_MEMOP_F_CHECK_ONLY;
> + ksmo.size = maxsize;
> + ksmo.op = KVM_S390_MEMOP_LOGICAL_WRITE;
> + ksmo.buf = (uintptr_t)mem1;
> + ksmo.ar = 0;
> + rv = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
> + TEST_ASSERT(rv > 0, "ioctl does not report bad guest memory access");
> +
> + /* Bad host address: */
> + ksmo.gaddr = (uintptr_t)mem1;
> + ksmo.flags = 0;
> + ksmo.size = maxsize;
> + ksmo.op = KVM_S390_MEMOP_LOGICAL_WRITE;
> + ksmo.buf = 0;
> + ksmo.ar = 0;
> + rv = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
> + TEST_ASSERT(rv == -1 && errno == EFAULT,
> + "ioctl does not report bad host memory address");
> +
> + /* Bad access register: */
> + run->psw_mask &= ~(3UL << (63 - 17));
> + run->psw_mask |= 1UL << (63 - 17); /* Enable AR mode */
> + vcpu_run(vm, VCPU_ID); /* To sync new state to SIE block */
> + ksmo.gaddr = (uintptr_t)mem1;
> + ksmo.flags = 0;
> + ksmo.size = maxsize;
> + ksmo.op = KVM_S390_MEMOP_LOGICAL_WRITE;
> + ksmo.buf = (uintptr_t)mem1;
> + ksmo.ar = 17;
> + rv = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_MEM_OP, &ksmo);
> + TEST_ASSERT(rv == -1 && errno == EINVAL, "ioctl allows ARs > 15");
> + run->psw_mask &= ~(3UL << (63 - 17)); /* Disable AR mode */
> + vcpu_run(vm, VCPU_ID); /* Run to sync new state */
> +
> + kvm_vm_free(vm);
> +
> + return 0;
> +}
>

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