498 lines
12 KiB
C
498 lines
12 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.h"
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#include "kvm.h"
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#include "cpu.h"
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#include "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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#define SCLP_CMDW_READ_SCP_INFO 0x00020001
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#define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
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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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int kvm_arch_init(KVMState *s)
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{
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return 0;
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}
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int kvm_arch_init_vcpu(CPUS390XState *env)
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{
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int ret = 0;
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if (kvm_vcpu_ioctl(env, 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(CPUS390XState *env)
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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(CPUS390XState *env, int level)
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{
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struct kvm_regs regs;
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int ret;
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int i;
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ret = kvm_vcpu_ioctl(env, 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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regs.gprs[i] = env->regs[i];
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}
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ret = kvm_vcpu_ioctl(env, 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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env->kvm_run->psw_addr = env->psw.addr;
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env->kvm_run->psw_mask = env->psw.mask;
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return ret;
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}
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int kvm_arch_get_registers(CPUS390XState *env)
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{
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int ret;
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struct kvm_regs regs;
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int i;
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ret = kvm_vcpu_ioctl(env, 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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env->psw.addr = env->kvm_run->psw_addr;
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env->psw.mask = env->kvm_run->psw_mask;
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return 0;
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}
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int kvm_arch_insert_sw_breakpoint(CPUS390XState *env, struct kvm_sw_breakpoint *bp)
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{
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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(CPUS390XState *env, struct kvm_sw_breakpoint *bp)
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{
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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(CPUS390XState *env, struct kvm_run *run)
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{
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}
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void kvm_arch_post_run(CPUS390XState *env, struct kvm_run *run)
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{
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}
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int kvm_arch_process_async_events(CPUS390XState *env)
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{
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return env->halted;
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}
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void kvm_s390_interrupt_internal(CPUS390XState *env, int type, uint32_t parm,
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uint64_t parm64, int vm)
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{
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struct kvm_s390_interrupt kvmint;
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int r;
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if (!env->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(env->kvm_state, KVM_S390_INTERRUPT, &kvmint);
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} else {
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r = kvm_vcpu_ioctl(env, 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(CPUS390XState *env, int config_change, uint64_t token)
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{
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kvm_s390_interrupt_internal(env, KVM_S390_INT_VIRTIO, config_change,
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token, 1);
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}
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void kvm_s390_interrupt(CPUS390XState *env, int type, uint32_t code)
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{
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kvm_s390_interrupt_internal(env, type, code, 0, 0);
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}
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static void enter_pgmcheck(CPUS390XState *env, uint16_t code)
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{
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kvm_s390_interrupt(env, KVM_S390_PROGRAM_INT, code);
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}
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static inline void setcc(CPUS390XState *env, uint64_t cc)
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{
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env->kvm_run->psw_mask &= ~(3ull << 44);
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env->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(CPUS390XState *env, struct kvm_run *run,
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uint16_t ipbh0)
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{
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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(env, sccb, code);
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if (r) {
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setcc(env, 3);
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}
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return 0;
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}
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static int handle_priv(CPUS390XState *env, 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(env, 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(env, KVM_S390_RESTART, 0);
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s390_add_running_cpu(env);
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qemu_cpu_kick(env);
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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(CPUS390XState *env)
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{
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int i;
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if (kvm_vcpu_ioctl(env, 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(CPUS390XState *env, struct kvm_run *run, uint8_t ipa1)
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{
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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_env);
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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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}
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out:
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setcc(env, r ? 3 : 0);
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return 0;
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}
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static int handle_instruction(CPUS390XState *env, struct kvm_run *run)
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{
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unsigned int ipa0 = (run->s390_sieic.ipa & 0xff00);
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uint8_t ipa1 = run->s390_sieic.ipa & 0x00ff;
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int ipb_code = (run->s390_sieic.ipb & 0x0fff0000) >> 16;
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int r = -1;
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dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
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switch (ipa0) {
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case IPA0_PRIV:
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r = handle_priv(env, run, ipa1);
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break;
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case IPA0_DIAG:
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r = handle_diag(env, run, ipb_code);
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break;
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case IPA0_SIGP:
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r = handle_sigp(env, run, ipa1);
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break;
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}
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if (r < 0) {
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enter_pgmcheck(env, 0x0001);
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}
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return 0;
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}
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static bool is_special_wait_psw(CPUS390XState *env)
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{
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/* signal quiesce */
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return env->kvm_run->psw_addr == 0xfffUL;
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}
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static int handle_intercept(CPUS390XState *env)
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{
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struct kvm_run *run = env->kvm_run;
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int icpt_code = run->s390_sieic.icptcode;
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int r = 0;
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dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code,
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(long)env->kvm_run->psw_addr);
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switch (icpt_code) {
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case ICPT_INSTRUCTION:
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r = handle_instruction(env, run);
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break;
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case ICPT_WAITPSW:
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if (s390_del_running_cpu(env) == 0 &&
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is_special_wait_psw(env)) {
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qemu_system_shutdown_request();
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}
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r = EXCP_HALTED;
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break;
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case ICPT_CPU_STOP:
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if (s390_del_running_cpu(env) == 0) {
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qemu_system_shutdown_request();
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}
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r = EXCP_HALTED;
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break;
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case ICPT_SOFT_INTERCEPT:
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fprintf(stderr, "KVM unimplemented icpt SOFT\n");
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exit(1);
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break;
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case ICPT_IO:
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fprintf(stderr, "KVM unimplemented icpt IO\n");
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exit(1);
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break;
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default:
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fprintf(stderr, "Unknown intercept code: %d\n", icpt_code);
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exit(1);
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break;
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}
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return r;
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}
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int kvm_arch_handle_exit(CPUS390XState *env, struct kvm_run *run)
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{
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int ret = 0;
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switch (run->exit_reason) {
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case KVM_EXIT_S390_SIEIC:
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ret = handle_intercept(env);
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break;
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case KVM_EXIT_S390_RESET:
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qemu_system_reset_request();
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break;
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default:
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fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
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break;
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}
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if (ret == 0) {
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ret = EXCP_INTERRUPT;
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}
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return ret;
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}
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bool kvm_arch_stop_on_emulation_error(CPUS390XState *env)
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{
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return true;
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}
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int kvm_arch_on_sigbus_vcpu(CPUS390XState *env, int code, void *addr)
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{
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return 1;
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}
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int kvm_arch_on_sigbus(int code, void *addr)
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{
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return 1;
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}
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