Commit ee1563f4 authored by Thomas Huth's avatar Thomas Huth Committed by Christian Borntraeger
Browse files

KVM: selftests: Add the sync_regs test for s390x 



The test is an adaption of the same test for x86. Note that there
are some differences in the way how s390x deals with the kvm_valid_regs
in struct kvm_run, so some of the tests had to be removed. Also this
test is not using the ucall() interface on s390x yet (which would need
some work to be usable on s390x), so it simply drops out of the VM with
a diag 0x501 breakpoint instead.

Signed-off-by: default avatarThomas Huth <thuth@redhat.com>
Message-Id: <20190523164309.13345-8-thuth@redhat.com>
Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
parent edf54478

MAINTAINERS

+1 −0
Original line number Diff line number Diff line
@@ -8674,6 +8674,7 @@ F: arch/s390/include/asm/gmap.h 
F:	arch/s390/include/asm/kvm*

F:	arch/s390/kvm/

F:	arch/s390/mm/gmap.c

F:	tools/testing/selftests/kvm/s390x/

F:	tools/testing/selftests/kvm/*/s390x/



KERNEL VIRTUAL MACHINE FOR X86 (KVM/x86)

tools/testing/selftests/kvm/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -30,6 +30,8 @@ TEST_GEN_PROGS_x86_64 += clear_dirty_log_test 
TEST_GEN_PROGS_aarch64 += dirty_log_test

TEST_GEN_PROGS_aarch64 += clear_dirty_log_test



TEST_GEN_PROGS_s390x += s390x/sync_regs_test



TEST_GEN_PROGS += $(TEST_GEN_PROGS_$(UNAME_M))

LIBKVM += $(LIBKVM_$(UNAME_M))

tools/testing/selftests/kvm/s390x/sync_regs_test.c

0 → 100644
+151 −0
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// SPDX-License-Identifier: GPL-2.0-only

/*

 * Test for s390x KVM_CAP_SYNC_REGS

 *

 * Based on the same test for x86:

 * Copyright (C) 2018, Google LLC.

 *

 * Adaptions for s390x:

 * Copyright (C) 2019, Red Hat, Inc.

 *

 * Test expected behavior of the KVM_CAP_SYNC_REGS functionality.

 */



#define _GNU_SOURCE /* for program_invocation_short_name */

#include <fcntl.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/ioctl.h>



#include "test_util.h"

#include "kvm_util.h"



#define VCPU_ID 5



static void guest_code(void)

{

	for (;;) {

		asm volatile ("diag 0,0,0x501");

		asm volatile ("ahi 11,1");

	}

}



#define REG_COMPARE(reg) \

	TEST_ASSERT(left->reg == right->reg, \

		    "Register " #reg \

		    " values did not match: 0x%llx, 0x%llx\n", \

		    left->reg, right->reg)



static void compare_regs(struct kvm_regs *left, struct kvm_sync_regs *right)

{

	int i;



	for (i = 0; i < 16; i++)

		REG_COMPARE(gprs[i]);

}



static void compare_sregs(struct kvm_sregs *left, struct kvm_sync_regs *right)

{

	int i;



	for (i = 0; i < 16; i++)

		REG_COMPARE(acrs[i]);



	for (i = 0; i < 16; i++)

		REG_COMPARE(crs[i]);

}



#undef REG_COMPARE



#define TEST_SYNC_FIELDS   (KVM_SYNC_GPRS|KVM_SYNC_ACRS|KVM_SYNC_CRS)

#define INVALID_SYNC_FIELD 0x80000000



int main(int argc, char *argv[])

{

	struct kvm_vm *vm;

	struct kvm_run *run;

	struct kvm_regs regs;

	struct kvm_sregs sregs;

	int rv, cap;



	/* Tell stdout not to buffer its content */

	setbuf(stdout, NULL);



	cap = kvm_check_cap(KVM_CAP_SYNC_REGS);

	if (!cap) {

		fprintf(stderr, "CAP_SYNC_REGS not supported, skipping test\n");

		exit(KSFT_SKIP);

	}



	/* Create VM */

	vm = vm_create_default(VCPU_ID, 0, guest_code);



	run = vcpu_state(vm, VCPU_ID);



	/* Request and verify all valid register sets. */

	run->kvm_valid_regs = TEST_SYNC_FIELDS;

	rv = _vcpu_run(vm, VCPU_ID);

	TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv);

	TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC,

		    "Unexpected exit reason: %u (%s)\n",

		    run->exit_reason,

		    exit_reason_str(run->exit_reason));

	TEST_ASSERT(run->s390_sieic.icptcode == 4 &&

		    (run->s390_sieic.ipa >> 8) == 0x83 &&

		    (run->s390_sieic.ipb >> 16) == 0x501,

		    "Unexpected interception code: ic=%u, ipa=0x%x, ipb=0x%x\n",

		    run->s390_sieic.icptcode, run->s390_sieic.ipa,

		    run->s390_sieic.ipb);



	vcpu_regs_get(vm, VCPU_ID, &regs);

	compare_regs(&regs, &run->s.regs);



	vcpu_sregs_get(vm, VCPU_ID, &sregs);

	compare_sregs(&sregs, &run->s.regs);



	/* Set and verify various register values */

	run->s.regs.gprs[11] = 0xBAD1DEA;

	run->s.regs.acrs[0] = 1 << 11;



	run->kvm_valid_regs = TEST_SYNC_FIELDS;

	run->kvm_dirty_regs = KVM_SYNC_GPRS | KVM_SYNC_ACRS;

	rv = _vcpu_run(vm, VCPU_ID);

	TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv);

	TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC,

		    "Unexpected exit reason: %u (%s)\n",

		    run->exit_reason,

		    exit_reason_str(run->exit_reason));

	TEST_ASSERT(run->s.regs.gprs[11] == 0xBAD1DEA + 1,

		    "r11 sync regs value incorrect 0x%llx.",

		    run->s.regs.gprs[11]);

	TEST_ASSERT(run->s.regs.acrs[0]  == 1 << 11,

		    "acr0 sync regs value incorrect 0x%llx.",

		    run->s.regs.acrs[0]);



	vcpu_regs_get(vm, VCPU_ID, &regs);

	compare_regs(&regs, &run->s.regs);



	vcpu_sregs_get(vm, VCPU_ID, &sregs);

	compare_sregs(&sregs, &run->s.regs);



	/* Clear kvm_dirty_regs bits, verify new s.regs values are

	 * overwritten with existing guest values.

	 */

	run->kvm_valid_regs = TEST_SYNC_FIELDS;

	run->kvm_dirty_regs = 0;

	run->s.regs.gprs[11] = 0xDEADBEEF;

	rv = _vcpu_run(vm, VCPU_ID);

	TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv);

	TEST_ASSERT(run->exit_reason == KVM_EXIT_S390_SIEIC,

		    "Unexpected exit reason: %u (%s)\n",

		    run->exit_reason,

		    exit_reason_str(run->exit_reason));

	TEST_ASSERT(run->s.regs.gprs[11] != 0xDEADBEEF,

		    "r11 sync regs value incorrect 0x%llx.",

		    run->s.regs.gprs[11]);



	kvm_vm_free(vm);



	return 0;

}

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