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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Test for s390x CPU resets
*
* Copyright (C) 2020, IBM
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include "test_util.h"
#include "kvm_util.h"
#define VCPU_ID 3
#define LOCAL_IRQS 32
struct kvm_s390_irq buf[VCPU_ID + LOCAL_IRQS];
struct kvm_vm *vm;
struct kvm_run *run;
struct kvm_sync_regs *regs;
static uint64_t regs_null[16];
static uint64_t crs[16] = { 0x40000ULL,
0x42000ULL,
0, 0, 0, 0, 0,
0x43000ULL,
0, 0, 0, 0, 0,
0x44000ULL,
0, 0
};
static void guest_code_initial(void)
{
/* Round toward 0 */
uint32_t fpc = 0x11;
/* Dirty registers */
asm volatile (
" lctlg 0,15,%0\n"
" sfpc %1\n"
: : "Q" (crs), "d" (fpc));
GUEST_SYNC(0);
}
static void test_one_reg(uint64_t id, uint64_t value)
{
struct kvm_one_reg reg;
uint64_t eval_reg;
reg.addr = (uintptr_t)&eval_reg;
reg.id = id;
vcpu_get_reg(vm, VCPU_ID, ®);
TEST_ASSERT(eval_reg == value, "value == %s", value);
}
static void assert_noirq(void)
{
struct kvm_s390_irq_state irq_state;
int irqs;
irq_state.len = sizeof(buf);
irq_state.buf = (unsigned long)buf;
irqs = _vcpu_ioctl(vm, VCPU_ID, KVM_S390_GET_IRQ_STATE, &irq_state);
/*
* irqs contains the number of retrieved interrupts. Any interrupt
* (notably, the emergency call interrupt we have injected) should
* be cleared by the resets, so this should be 0.
*/
TEST_ASSERT(irqs >= 0, "Could not fetch IRQs: errno %d\n", errno);
TEST_ASSERT(!irqs, "IRQ pending");
}
static void assert_clear(void)
{
struct kvm_sregs sregs;
struct kvm_regs regs;
struct kvm_fpu fpu;
vcpu_regs_get(vm, VCPU_ID, ®s);
TEST_ASSERT(!memcmp(®s.gprs, regs_null, sizeof(regs.gprs)), "grs == 0");
vcpu_sregs_get(vm, VCPU_ID, &sregs);
TEST_ASSERT(!memcmp(&sregs.acrs, regs_null, sizeof(sregs.acrs)), "acrs == 0");
vcpu_fpu_get(vm, VCPU_ID, &fpu);
TEST_ASSERT(!memcmp(&fpu.fprs, regs_null, sizeof(fpu.fprs)), "fprs == 0");
}
static void assert_initial(void)
{
struct kvm_sregs sregs;
struct kvm_fpu fpu;
vcpu_sregs_get(vm, VCPU_ID, &sregs);
TEST_ASSERT(sregs.crs[0] == 0xE0UL, "cr0 == 0xE0");
TEST_ASSERT(sregs.crs[14] == 0xC2000000UL, "cr14 == 0xC2000000");
TEST_ASSERT(!memcmp(&sregs.crs[1], regs_null, sizeof(sregs.crs[1]) * 12),
"cr1-13 == 0");
TEST_ASSERT(sregs.crs[15] == 0, "cr15 == 0");
vcpu_fpu_get(vm, VCPU_ID, &fpu);
TEST_ASSERT(!fpu.fpc, "fpc == 0");
test_one_reg(KVM_REG_S390_GBEA, 1);
test_one_reg(KVM_REG_S390_PP, 0);
test_one_reg(KVM_REG_S390_TODPR, 0);
test_one_reg(KVM_REG_S390_CPU_TIMER, 0);
test_one_reg(KVM_REG_S390_CLOCK_COMP, 0);
}
static void assert_normal(void)
{
test_one_reg(KVM_REG_S390_PFTOKEN, KVM_S390_PFAULT_TOKEN_INVALID);
assert_noirq();
}
static void inject_irq(int cpu_id)
{
struct kvm_s390_irq_state irq_state;
struct kvm_s390_irq *irq = &buf[0];
int irqs;
/* Inject IRQ */
irq_state.len = sizeof(struct kvm_s390_irq);
irq_state.buf = (unsigned long)buf;
irq->type = KVM_S390_INT_EMERGENCY;
irq->u.emerg.code = cpu_id;
irqs = _vcpu_ioctl(vm, cpu_id, KVM_S390_SET_IRQ_STATE, &irq_state);
TEST_ASSERT(irqs >= 0, "Error injecting EMERGENCY IRQ errno %d\n", errno);
}
static void test_normal(void)
{
printf("Testing normal reset\n");
/* Create VM */
vm = vm_create_default(VCPU_ID, 0, guest_code_initial);
run = vcpu_state(vm, VCPU_ID);
regs = &run->s.regs;
vcpu_run(vm, VCPU_ID);
inject_irq(VCPU_ID);
vcpu_ioctl(vm, VCPU_ID, KVM_S390_NORMAL_RESET, 0);
assert_normal();
kvm_vm_free(vm);
}
static void test_initial(void)
{
printf("Testing initial reset\n");
vm = vm_create_default(VCPU_ID, 0, guest_code_initial);
run = vcpu_state(vm, VCPU_ID);
regs = &run->s.regs;
vcpu_run(vm, VCPU_ID);
inject_irq(VCPU_ID);
vcpu_ioctl(vm, VCPU_ID, KVM_S390_INITIAL_RESET, 0);
assert_normal();
assert_initial();
kvm_vm_free(vm);
}
static void test_clear(void)
{
printf("Testing clear reset\n");
vm = vm_create_default(VCPU_ID, 0, guest_code_initial);
run = vcpu_state(vm, VCPU_ID);
regs = &run->s.regs;
vcpu_run(vm, VCPU_ID);
inject_irq(VCPU_ID);
vcpu_ioctl(vm, VCPU_ID, KVM_S390_CLEAR_RESET, 0);
assert_normal();
assert_initial();
assert_clear();
kvm_vm_free(vm);
}
int main(int argc, char *argv[])
{
setbuf(stdout, NULL); /* Tell stdout not to buffer its content */
test_initial();
if (kvm_check_cap(KVM_CAP_S390_VCPU_RESETS)) {
test_normal();
test_clear();
}
return 0;
}
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