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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"
#include "diag318_test_handler.h"
#include "kselftest.h"
static void guest_code(void)
{
/*
* We embed diag 501 here instead of doing a ucall to avoid that
* the compiler has messed with r11 at the time of the ucall.
*/
asm volatile (
"0: diag 0,0,0x501\n"
" ahi 11,1\n"
" j 0b\n"
);
}
#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)
#define REG_COMPARE32(reg) \
TEST_ASSERT(left->reg == right->reg, \
"Register " #reg \
" values did not match: 0x%x, 0x%x\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_COMPARE32(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|KVM_SYNC_DIAG318)
#define INVALID_SYNC_FIELD 0x80000000
void test_read_invalid(struct kvm_vcpu *vcpu)
{
struct kvm_run *run = vcpu->run;
int rv;
/* Request reading invalid register set from VCPU. */
run->kvm_valid_regs = INVALID_SYNC_FIELD;
rv = _vcpu_run(vcpu);
TEST_ASSERT(rv < 0 && errno == EINVAL,
"Invalid kvm_valid_regs did not cause expected KVM_RUN error: %d\n",
rv);
run->kvm_valid_regs = 0;
run->kvm_valid_regs = INVALID_SYNC_FIELD | TEST_SYNC_FIELDS;
rv = _vcpu_run(vcpu);
TEST_ASSERT(rv < 0 && errno == EINVAL,
"Invalid kvm_valid_regs did not cause expected KVM_RUN error: %d\n",
rv);
run->kvm_valid_regs = 0;
}
void test_set_invalid(struct kvm_vcpu *vcpu)
{
struct kvm_run *run = vcpu->run;
int rv;
/* Request setting invalid register set into VCPU. */
run->kvm_dirty_regs = INVALID_SYNC_FIELD;
rv = _vcpu_run(vcpu);
TEST_ASSERT(rv < 0 && errno == EINVAL,
"Invalid kvm_dirty_regs did not cause expected KVM_RUN error: %d\n",
rv);
run->kvm_dirty_regs = 0;
run->kvm_dirty_regs = INVALID_SYNC_FIELD | TEST_SYNC_FIELDS;
rv = _vcpu_run(vcpu);
TEST_ASSERT(rv < 0 && errno == EINVAL,
"Invalid kvm_dirty_regs did not cause expected KVM_RUN error: %d\n",
rv);
run->kvm_dirty_regs = 0;
}
void test_req_and_verify_all_valid_regs(struct kvm_vcpu *vcpu)
{
struct kvm_run *run = vcpu->run;
struct kvm_sregs sregs;
struct kvm_regs regs;
int rv;
/* Request and verify all valid register sets. */
run->kvm_valid_regs = TEST_SYNC_FIELDS;
rv = _vcpu_run(vcpu);
TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv);
TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC);
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(vcpu, ®s);
compare_regs(®s, &run->s.regs);
vcpu_sregs_get(vcpu, &sregs);
compare_sregs(&sregs, &run->s.regs);
}
void test_set_and_verify_various_reg_values(struct kvm_vcpu *vcpu)
{
struct kvm_run *run = vcpu->run;
struct kvm_sregs sregs;
struct kvm_regs regs;
int rv;
/* 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;
if (get_diag318_info() > 0) {
run->s.regs.diag318 = get_diag318_info();
run->kvm_dirty_regs |= KVM_SYNC_DIAG318;
}
rv = _vcpu_run(vcpu);
TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv);
TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC);
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%x.",
run->s.regs.acrs[0]);
TEST_ASSERT(run->s.regs.diag318 == get_diag318_info(),
"diag318 sync regs value incorrect 0x%llx.",
run->s.regs.diag318);
vcpu_regs_get(vcpu, ®s);
compare_regs(®s, &run->s.regs);
vcpu_sregs_get(vcpu, &sregs);
compare_sregs(&sregs, &run->s.regs);
}
void test_clear_kvm_dirty_regs_bits(struct kvm_vcpu *vcpu)
{
struct kvm_run *run = vcpu->run;
int rv;
/* 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;
run->s.regs.diag318 = 0x4B1D;
rv = _vcpu_run(vcpu);
TEST_ASSERT(rv == 0, "vcpu_run failed: %d\n", rv);
TEST_ASSERT_KVM_EXIT_REASON(vcpu, KVM_EXIT_S390_SIEIC);
TEST_ASSERT(run->s.regs.gprs[11] != 0xDEADBEEF,
"r11 sync regs value incorrect 0x%llx.",
run->s.regs.gprs[11]);
TEST_ASSERT(run->s.regs.diag318 != 0x4B1D,
"diag318 sync regs value incorrect 0x%llx.",
run->s.regs.diag318);
}
struct testdef {
const char *name;
void (*test)(struct kvm_vcpu *vcpu);
} testlist[] = {
{ "read invalid", test_read_invalid },
{ "set invalid", test_set_invalid },
{ "request+verify all valid regs", test_req_and_verify_all_valid_regs },
{ "set+verify various regs", test_set_and_verify_various_reg_values },
{ "clear kvm_dirty_regs bits", test_clear_kvm_dirty_regs_bits },
};
int main(int argc, char *argv[])
{
struct kvm_vcpu *vcpu;
struct kvm_vm *vm;
int idx;
TEST_REQUIRE(kvm_has_cap(KVM_CAP_SYNC_REGS));
ksft_print_header();
ksft_set_plan(ARRAY_SIZE(testlist));
/* Create VM */
vm = vm_create_with_one_vcpu(&vcpu, guest_code);
for (idx = 0; idx < ARRAY_SIZE(testlist); idx++) {
testlist[idx].test(vcpu);
ksft_test_result_pass("%s\n", testlist[idx].name);
}
kvm_vm_free(vm);
ksft_finished(); /* Print results and exit() accordingly */
}
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