624 lines
16 KiB
C
624 lines
16 KiB
C
/*
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* QEMU S390x KVM implementation
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*
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* Copyright (c) 2009 Alexander Graf <agraf@suse.de>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <linux/kvm.h>
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#include <asm/ptrace.h>
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#include "qemu-common.h"
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#include "qemu/timer.h"
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#include "sysemu/sysemu.h"
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#include "sysemu/kvm.h"
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#include "cpu.h"
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#include "sysemu/device_tree.h"
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/* #define DEBUG_KVM */
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#ifdef DEBUG_KVM
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#define dprintf(fmt, ...) \
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do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
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#else
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#define dprintf(fmt, ...) \
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do { } while (0)
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#endif
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#define IPA0_DIAG 0x8300
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#define IPA0_SIGP 0xae00
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#define IPA0_PRIV 0xb200
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#define PRIV_SCLP_CALL 0x20
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#define DIAG_KVM_HYPERCALL 0x500
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#define DIAG_KVM_BREAKPOINT 0x501
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#define ICPT_INSTRUCTION 0x04
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#define ICPT_WAITPSW 0x1c
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#define ICPT_SOFT_INTERCEPT 0x24
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#define ICPT_CPU_STOP 0x28
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#define ICPT_IO 0x40
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#define SIGP_RESTART 0x06
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#define SIGP_INITIAL_CPU_RESET 0x0b
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#define SIGP_STORE_STATUS_ADDR 0x0e
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#define SIGP_SET_ARCH 0x12
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const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
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KVM_CAP_LAST_INFO
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};
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static int cap_sync_regs;
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int kvm_arch_init(KVMState *s)
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{
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cap_sync_regs = kvm_check_extension(s, KVM_CAP_SYNC_REGS);
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return 0;
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}
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int kvm_arch_init_vcpu(CPUState *cpu)
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{
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int ret = 0;
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if (kvm_vcpu_ioctl(cpu, KVM_S390_INITIAL_RESET, NULL) < 0) {
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perror("cannot init reset vcpu");
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}
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return ret;
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}
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void kvm_arch_reset_vcpu(CPUState *cpu)
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{
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/* FIXME: add code to reset vcpu. */
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}
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int kvm_arch_put_registers(CPUState *cs, int level)
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{
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S390CPU *cpu = S390_CPU(cs);
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CPUS390XState *env = &cpu->env;
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struct kvm_sregs sregs;
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struct kvm_regs regs;
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int ret;
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int i;
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/* always save the PSW and the GPRS*/
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cs->kvm_run->psw_addr = env->psw.addr;
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cs->kvm_run->psw_mask = env->psw.mask;
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if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
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for (i = 0; i < 16; i++) {
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cs->kvm_run->s.regs.gprs[i] = env->regs[i];
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cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_GPRS;
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}
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} else {
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for (i = 0; i < 16; i++) {
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regs.gprs[i] = env->regs[i];
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}
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ret = kvm_vcpu_ioctl(cs, KVM_SET_REGS, ®s);
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if (ret < 0) {
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return ret;
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}
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}
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/* Do we need to save more than that? */
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if (level == KVM_PUT_RUNTIME_STATE) {
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return 0;
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}
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if (cap_sync_regs &&
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cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
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cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
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for (i = 0; i < 16; i++) {
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cs->kvm_run->s.regs.acrs[i] = env->aregs[i];
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cs->kvm_run->s.regs.crs[i] = env->cregs[i];
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}
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cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_ACRS;
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cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_CRS;
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} else {
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for (i = 0; i < 16; i++) {
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sregs.acrs[i] = env->aregs[i];
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sregs.crs[i] = env->cregs[i];
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}
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ret = kvm_vcpu_ioctl(cs, KVM_SET_SREGS, &sregs);
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if (ret < 0) {
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return ret;
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}
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}
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/* Finally the prefix */
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if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
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cs->kvm_run->s.regs.prefix = env->psa;
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cs->kvm_run->kvm_dirty_regs |= KVM_SYNC_PREFIX;
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} else {
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/* prefix is only supported via sync regs */
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}
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return 0;
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}
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int kvm_arch_get_registers(CPUState *cs)
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{
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S390CPU *cpu = S390_CPU(cs);
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CPUS390XState *env = &cpu->env;
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struct kvm_sregs sregs;
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struct kvm_regs regs;
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int ret;
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int i;
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/* get the PSW */
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env->psw.addr = cs->kvm_run->psw_addr;
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env->psw.mask = cs->kvm_run->psw_mask;
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/* the GPRS */
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if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_GPRS) {
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for (i = 0; i < 16; i++) {
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env->regs[i] = cs->kvm_run->s.regs.gprs[i];
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}
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} else {
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ret = kvm_vcpu_ioctl(cs, KVM_GET_REGS, ®s);
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if (ret < 0) {
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return ret;
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}
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for (i = 0; i < 16; i++) {
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env->regs[i] = regs.gprs[i];
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}
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}
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/* The ACRS and CRS */
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if (cap_sync_regs &&
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cs->kvm_run->kvm_valid_regs & KVM_SYNC_ACRS &&
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cs->kvm_run->kvm_valid_regs & KVM_SYNC_CRS) {
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for (i = 0; i < 16; i++) {
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env->aregs[i] = cs->kvm_run->s.regs.acrs[i];
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env->cregs[i] = cs->kvm_run->s.regs.crs[i];
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}
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} else {
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ret = kvm_vcpu_ioctl(cs, KVM_GET_SREGS, &sregs);
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if (ret < 0) {
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return ret;
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}
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for (i = 0; i < 16; i++) {
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env->aregs[i] = sregs.acrs[i];
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env->cregs[i] = sregs.crs[i];
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}
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}
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/* Finally the prefix */
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if (cap_sync_regs && cs->kvm_run->kvm_valid_regs & KVM_SYNC_PREFIX) {
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env->psa = cs->kvm_run->s.regs.prefix;
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} else {
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/* no prefix without sync regs */
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}
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return 0;
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}
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/*
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* Legacy layout for s390:
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* Older S390 KVM requires the topmost vma of the RAM to be
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* smaller than an system defined value, which is at least 256GB.
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* Larger systems have larger values. We put the guest between
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* the end of data segment (system break) and this value. We
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* use 32GB as a base to have enough room for the system break
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* to grow. We also have to use MAP parameters that avoid
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* read-only mapping of guest pages.
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*/
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static void *legacy_s390_alloc(ram_addr_t size)
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{
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void *mem;
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mem = mmap((void *) 0x800000000ULL, size,
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PROT_EXEC|PROT_READ|PROT_WRITE,
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MAP_SHARED | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
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if (mem == MAP_FAILED) {
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fprintf(stderr, "Allocating RAM failed\n");
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abort();
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}
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return mem;
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}
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void *kvm_arch_vmalloc(ram_addr_t size)
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{
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/* Can we use the standard allocation ? */
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if (kvm_check_extension(kvm_state, KVM_CAP_S390_GMAP) &&
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kvm_check_extension(kvm_state, KVM_CAP_S390_COW)) {
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return NULL;
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} else {
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return legacy_s390_alloc(size);
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}
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}
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int kvm_arch_insert_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
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{
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S390CPU *cpu = S390_CPU(cs);
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CPUS390XState *env = &cpu->env;
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static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
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if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
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cpu_memory_rw_debug(env, bp->pc, (uint8_t *)diag_501, 4, 1)) {
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return -EINVAL;
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}
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return 0;
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}
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int kvm_arch_remove_sw_breakpoint(CPUState *cs, struct kvm_sw_breakpoint *bp)
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{
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S390CPU *cpu = S390_CPU(cs);
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CPUS390XState *env = &cpu->env;
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uint8_t t[4];
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static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
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if (cpu_memory_rw_debug(env, bp->pc, t, 4, 0)) {
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return -EINVAL;
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} else if (memcmp(t, diag_501, 4)) {
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return -EINVAL;
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} else if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
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return -EINVAL;
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}
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return 0;
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}
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void kvm_arch_pre_run(CPUState *cpu, struct kvm_run *run)
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{
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}
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void kvm_arch_post_run(CPUState *cpu, struct kvm_run *run)
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{
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}
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int kvm_arch_process_async_events(CPUState *cs)
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{
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S390CPU *cpu = S390_CPU(cs);
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return cpu->env.halted;
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}
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void kvm_s390_interrupt_internal(S390CPU *cpu, int type, uint32_t parm,
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uint64_t parm64, int vm)
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{
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CPUState *cs = CPU(cpu);
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struct kvm_s390_interrupt kvmint;
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int r;
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if (!cs->kvm_state) {
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return;
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}
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kvmint.type = type;
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kvmint.parm = parm;
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kvmint.parm64 = parm64;
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if (vm) {
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r = kvm_vm_ioctl(cs->kvm_state, KVM_S390_INTERRUPT, &kvmint);
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} else {
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r = kvm_vcpu_ioctl(cs, KVM_S390_INTERRUPT, &kvmint);
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}
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if (r < 0) {
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fprintf(stderr, "KVM failed to inject interrupt\n");
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exit(1);
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}
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}
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void kvm_s390_virtio_irq(S390CPU *cpu, int config_change, uint64_t token)
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{
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kvm_s390_interrupt_internal(cpu, KVM_S390_INT_VIRTIO, config_change,
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token, 1);
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}
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void kvm_s390_interrupt(S390CPU *cpu, int type, uint32_t code)
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{
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kvm_s390_interrupt_internal(cpu, type, code, 0, 0);
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}
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static void enter_pgmcheck(S390CPU *cpu, uint16_t code)
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{
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kvm_s390_interrupt(cpu, KVM_S390_PROGRAM_INT, code);
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}
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static inline void setcc(S390CPU *cpu, uint64_t cc)
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{
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CPUS390XState *env = &cpu->env;
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CPUState *cs = CPU(cpu);
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cs->kvm_run->psw_mask &= ~(3ull << 44);
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cs->kvm_run->psw_mask |= (cc & 3) << 44;
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env->psw.mask &= ~(3ul << 44);
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env->psw.mask |= (cc & 3) << 44;
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}
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static int kvm_sclp_service_call(S390CPU *cpu, struct kvm_run *run,
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uint16_t ipbh0)
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{
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CPUS390XState *env = &cpu->env;
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uint32_t sccb;
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uint64_t code;
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int r = 0;
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cpu_synchronize_state(env);
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sccb = env->regs[ipbh0 & 0xf];
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code = env->regs[(ipbh0 & 0xf0) >> 4];
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r = sclp_service_call(sccb, code);
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if (r < 0) {
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enter_pgmcheck(cpu, -r);
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}
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setcc(cpu, r);
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return 0;
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}
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static int handle_priv(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
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{
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int r = 0;
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uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
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dprintf("KVM: PRIV: %d\n", ipa1);
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switch (ipa1) {
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case PRIV_SCLP_CALL:
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r = kvm_sclp_service_call(cpu, run, ipbh0);
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break;
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default:
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dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
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r = -1;
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break;
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}
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return r;
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}
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static int handle_hypercall(CPUS390XState *env, struct kvm_run *run)
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{
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cpu_synchronize_state(env);
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env->regs[2] = s390_virtio_hypercall(env, env->regs[2], env->regs[1]);
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return 0;
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}
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static int handle_diag(CPUS390XState *env, struct kvm_run *run, int ipb_code)
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{
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int r = 0;
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switch (ipb_code) {
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case DIAG_KVM_HYPERCALL:
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r = handle_hypercall(env, run);
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break;
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case DIAG_KVM_BREAKPOINT:
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sleep(10);
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break;
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default:
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dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
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r = -1;
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break;
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}
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return r;
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}
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static int s390_cpu_restart(S390CPU *cpu)
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{
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CPUS390XState *env = &cpu->env;
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kvm_s390_interrupt(cpu, KVM_S390_RESTART, 0);
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s390_add_running_cpu(env);
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qemu_cpu_kick(CPU(cpu));
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dprintf("DONE: SIGP cpu restart: %p\n", env);
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return 0;
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}
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static int s390_store_status(CPUS390XState *env, uint32_t parameter)
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{
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/* XXX */
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fprintf(stderr, "XXX SIGP store status\n");
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return -1;
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}
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static int s390_cpu_initial_reset(S390CPU *cpu)
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{
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CPUS390XState *env = &cpu->env;
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int i;
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s390_del_running_cpu(env);
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if (kvm_vcpu_ioctl(CPU(cpu), KVM_S390_INITIAL_RESET, NULL) < 0) {
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perror("cannot init reset vcpu");
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}
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/* Manually zero out all registers */
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cpu_synchronize_state(env);
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for (i = 0; i < 16; i++) {
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env->regs[i] = 0;
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}
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dprintf("DONE: SIGP initial reset: %p\n", env);
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return 0;
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}
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static int handle_sigp(S390CPU *cpu, struct kvm_run *run, uint8_t ipa1)
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{
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CPUS390XState *env = &cpu->env;
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uint8_t order_code;
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uint32_t parameter;
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uint16_t cpu_addr;
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uint8_t t;
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int r = -1;
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S390CPU *target_cpu;
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CPUS390XState *target_env;
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cpu_synchronize_state(env);
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/* get order code */
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order_code = run->s390_sieic.ipb >> 28;
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if (order_code > 0) {
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order_code = env->regs[order_code];
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}
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order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
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/* get parameters */
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t = (ipa1 & 0xf0) >> 4;
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if (!(t % 2)) {
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t++;
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}
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parameter = env->regs[t] & 0x7ffffe00;
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cpu_addr = env->regs[ipa1 & 0x0f];
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target_cpu = s390_cpu_addr2state(cpu_addr);
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if (target_cpu == NULL) {
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goto out;
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}
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target_env = &target_cpu->env;
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switch (order_code) {
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case SIGP_RESTART:
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r = s390_cpu_restart(target_cpu);
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break;
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case SIGP_STORE_STATUS_ADDR:
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r = s390_store_status(target_env, parameter);
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break;
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case SIGP_SET_ARCH:
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/* make the caller panic */
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return -1;
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case SIGP_INITIAL_CPU_RESET:
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r = s390_cpu_initial_reset(target_cpu);
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break;
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default:
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fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", order_code);
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break;
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|
}
|
|
|
|
out:
|
|
setcc(cpu, r ? 3 : 0);
|
|
return 0;
|
|
}
|
|
|
|
static int handle_instruction(S390CPU *cpu, struct kvm_run *run)
|
|
{
|
|
CPUS390XState *env = &cpu->env;
|
|
unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
|
|
uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
|
|
int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
|
|
int r = -1;
|
|
|
|
dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
|
|
switch (ipa0) {
|
|
case IPA0_PRIV:
|
|
r = handle_priv(cpu, run, ipa1);
|
|
break;
|
|
case IPA0_DIAG:
|
|
r = handle_diag(env, run, ipb_code);
|
|
break;
|
|
case IPA0_SIGP:
|
|
r = handle_sigp(cpu, run, ipa1);
|
|
break;
|
|
}
|
|
|
|
if (r < 0) {
|
|
enter_pgmcheck(cpu, 0x0001);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static bool is_special_wait_psw(CPUState *cs)
|
|
{
|
|
/* signal quiesce */
|
|
return cs->kvm_run->psw_addr == 0xfffUL;
|
|
}
|
|
|
|
static int handle_intercept(S390CPU *cpu)
|
|
{
|
|
CPUS390XState *env = &cpu->env;
|
|
CPUState *cs = CPU(cpu);
|
|
struct kvm_run *run = cs->kvm_run;
|
|
int icpt_code = run->s390_sieic.icptcode;
|
|
int r = 0;
|
|
|
|
dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code,
|
|
(long)cs->kvm_run->psw_addr);
|
|
switch (icpt_code) {
|
|
case ICPT_INSTRUCTION:
|
|
r = handle_instruction(cpu, run);
|
|
break;
|
|
case ICPT_WAITPSW:
|
|
if (s390_del_running_cpu(env) == 0 &&
|
|
is_special_wait_psw(cs)) {
|
|
qemu_system_shutdown_request();
|
|
}
|
|
r = EXCP_HALTED;
|
|
break;
|
|
case ICPT_CPU_STOP:
|
|
if (s390_del_running_cpu(env) == 0) {
|
|
qemu_system_shutdown_request();
|
|
}
|
|
r = EXCP_HALTED;
|
|
break;
|
|
case ICPT_SOFT_INTERCEPT:
|
|
fprintf(stderr, "KVM unimplemented icpt SOFT\n");
|
|
exit(1);
|
|
break;
|
|
case ICPT_IO:
|
|
fprintf(stderr, "KVM unimplemented icpt IO\n");
|
|
exit(1);
|
|
break;
|
|
default:
|
|
fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
|
|
exit(1);
|
|
break;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
|
|
{
|
|
S390CPU *cpu = S390_CPU(cs);
|
|
int ret = 0;
|
|
|
|
switch (run->exit_reason) {
|
|
case KVM_EXIT_S390_SIEIC:
|
|
ret = handle_intercept(cpu);
|
|
break;
|
|
case KVM_EXIT_S390_RESET:
|
|
qemu_system_reset_request();
|
|
break;
|
|
default:
|
|
fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
|
|
break;
|
|
}
|
|
|
|
if (ret == 0) {
|
|
ret = EXCP_INTERRUPT;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
bool kvm_arch_stop_on_emulation_error(CPUState *cpu)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
int kvm_arch_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
int kvm_arch_on_sigbus(int code, void *addr)
|
|
{
|
|
return 1;
|
|
}
|