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authorAlexander Graf <agraf@suse.de>2009-12-05 12:44:24 +0100
committerAurelien Jarno <aurelien@aurel32.net>2009-12-05 17:36:02 +0100
commit0e60a699d22be754c63392e5c5a275bff27726b7 (patch)
treeeca2b7ca586702cf5007ea3764d158413b26aaf4 /target-s390x
parent2827822ef1b725cb9b28e8ca62c2cf2a937e4f19 (diff)
Add KVM support for S390x
S390x was one of the first platforms that received support for KVM back in the day. Unfortunately until now there hasn't been a qemu implementation that would enable users to actually run guests. So let's include support for KVM S390x in qemu! Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Diffstat (limited to 'target-s390x')
-rw-r--r--target-s390x/kvm.c483
1 files changed, 483 insertions, 0 deletions
diff --git a/target-s390x/kvm.c b/target-s390x/kvm.c
new file mode 100644
index 000000000..b6aac424d
--- /dev/null
+++ b/target-s390x/kvm.c
@@ -0,0 +1,483 @@
+/*
+ * QEMU S390x KVM implementation
+ *
+ * Copyright (c) 2009 Alexander Graf <agraf@suse.de>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+
+#include <linux/kvm.h>
+#include <asm/ptrace.h>
+
+#include "qemu-common.h"
+#include "qemu-timer.h"
+#include "sysemu.h"
+#include "kvm.h"
+#include "cpu.h"
+#include "device_tree.h"
+
+/* #define DEBUG_KVM */
+
+#ifdef DEBUG_KVM
+#define dprintf(fmt, ...) \
+ do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
+#else
+#define dprintf(fmt, ...) \
+ do { } while (0)
+#endif
+
+#define IPA0_DIAG 0x8300
+#define IPA0_SIGP 0xae00
+#define IPA0_PRIV 0xb200
+
+#define PRIV_SCLP_CALL 0x20
+#define DIAG_KVM_HYPERCALL 0x500
+#define DIAG_KVM_BREAKPOINT 0x501
+
+#define SCP_LENGTH 0x00
+#define SCP_FUNCTION_CODE 0x02
+#define SCP_CONTROL_MASK 0x03
+#define SCP_RESPONSE_CODE 0x06
+#define SCP_MEM_CODE 0x08
+#define SCP_INCREMENT 0x0a
+
+#define ICPT_INSTRUCTION 0x04
+#define ICPT_WAITPSW 0x1c
+#define ICPT_SOFT_INTERCEPT 0x24
+#define ICPT_CPU_STOP 0x28
+#define ICPT_IO 0x40
+
+#define SIGP_RESTART 0x06
+#define SIGP_INITIAL_CPU_RESET 0x0b
+#define SIGP_STORE_STATUS_ADDR 0x0e
+#define SIGP_SET_ARCH 0x12
+
+#define SCLP_CMDW_READ_SCP_INFO 0x00020001
+#define SCLP_CMDW_READ_SCP_INFO_FORCED 0x00120001
+
+int kvm_arch_init(KVMState *s, int smp_cpus)
+{
+ return 0;
+}
+
+int kvm_arch_init_vcpu(CPUState *env)
+{
+ int ret = 0;
+
+ if (kvm_vcpu_ioctl(env, KVM_S390_INITIAL_RESET, NULL) < 0) {
+ perror("cannot init reset vcpu");
+ }
+
+ return ret;
+}
+
+void kvm_arch_reset_vcpu(CPUState *env)
+{
+ /* FIXME: add code to reset vcpu. */
+}
+
+int kvm_arch_put_registers(CPUState *env)
+{
+ struct kvm_regs regs;
+ int ret;
+ int i;
+
+ ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
+ if (ret < 0) {
+ return ret;
+ }
+
+ for (i = 0; i < 16; i++) {
+ regs.gprs[i] = env->regs[i];
+ }
+
+ ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, &regs);
+ if (ret < 0) {
+ return ret;
+ }
+
+ env->kvm_run->psw_addr = env->psw.addr;
+ env->kvm_run->psw_mask = env->psw.mask;
+
+ return ret;
+}
+
+int kvm_arch_get_registers(CPUState *env)
+{
+ uint32_t ret;
+ struct kvm_regs regs;
+ int i;
+
+ ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
+ if (ret < 0) {
+ return ret;
+ }
+
+ for (i = 0; i < 16; i++) {
+ env->regs[i] = regs.gprs[i];
+ }
+
+ env->psw.addr = env->kvm_run->psw_addr;
+ env->psw.mask = env->kvm_run->psw_mask;
+
+ return 0;
+}
+
+int kvm_arch_insert_sw_breakpoint(CPUState *env, struct kvm_sw_breakpoint *bp)
+{
+ static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
+
+ if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 4, 0) ||
+ cpu_memory_rw_debug(env, bp->pc, (uint8_t *)diag_501, 4, 1)) {
+ return -EINVAL;
+ }
+ return 0;
+}
+
+int kvm_arch_remove_sw_breakpoint(CPUState *env, struct kvm_sw_breakpoint *bp)
+{
+ uint8_t t[4];
+ static const uint8_t diag_501[] = {0x83, 0x24, 0x05, 0x01};
+
+ if (cpu_memory_rw_debug(env, bp->pc, t, 4, 0)) {
+ return -EINVAL;
+ } else if (memcmp(t, diag_501, 4)) {
+ return -EINVAL;
+ } else if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1)) {
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+int kvm_arch_pre_run(CPUState *env, struct kvm_run *run)
+{
+ return 0;
+}
+
+int kvm_arch_post_run(CPUState *env, struct kvm_run *run)
+{
+ return 0;
+}
+
+static void kvm_s390_interrupt_internal(CPUState *env, int type, uint32_t parm,
+ uint64_t parm64, int vm)
+{
+ struct kvm_s390_interrupt kvmint;
+ int r;
+
+ if (!env->kvm_state) {
+ return;
+ }
+
+ env->halted = 0;
+ env->exception_index = 0;
+
+ kvmint.type = type;
+ kvmint.parm = parm;
+ kvmint.parm64 = parm64;
+
+ if (vm) {
+ r = kvm_vm_ioctl(env->kvm_state, KVM_S390_INTERRUPT, &kvmint);
+ } else {
+ r = kvm_vcpu_ioctl(env, KVM_S390_INTERRUPT, &kvmint);
+ }
+
+ if (r < 0) {
+ fprintf(stderr, "KVM failed to inject interrupt\n");
+ exit(1);
+ }
+}
+
+void kvm_s390_virtio_irq(CPUState *env, int config_change, uint64_t token)
+{
+ kvm_s390_interrupt_internal(env, KVM_S390_INT_VIRTIO, config_change,
+ token, 1);
+}
+
+static void kvm_s390_interrupt(CPUState *env, int type, uint32_t code)
+{
+ kvm_s390_interrupt_internal(env, type, code, 0, 0);
+}
+
+static void enter_pgmcheck(CPUState *env, uint16_t code)
+{
+ kvm_s390_interrupt(env, KVM_S390_PROGRAM_INT, code);
+}
+
+static void setcc(CPUState *env, uint64_t cc)
+{
+ env->kvm_run->psw_mask &= ~(3ul << 44);
+ env->kvm_run->psw_mask |= (cc & 3) << 44;
+
+ env->psw.mask &= ~(3ul << 44);
+ env->psw.mask |= (cc & 3) << 44;
+}
+
+static int sclp_service_call(CPUState *env, struct kvm_run *run, uint16_t ipbh0)
+{
+ uint32_t sccb;
+ uint64_t code;
+ int r = 0;
+
+ cpu_synchronize_state(env);
+ sccb = env->regs[ipbh0 & 0xf];
+ code = env->regs[(ipbh0 & 0xf0) >> 4];
+
+ dprintf("sclp(0x%x, 0x%lx)\n", sccb, code);
+
+ if (sccb & ~0x7ffffff8ul) {
+ fprintf(stderr, "KVM: invalid sccb address 0x%x\n", sccb);
+ r = -1;
+ goto out;
+ }
+
+ switch(code) {
+ case SCLP_CMDW_READ_SCP_INFO:
+ case SCLP_CMDW_READ_SCP_INFO_FORCED:
+ stw_phys(sccb + SCP_MEM_CODE, ram_size >> 20);
+ stb_phys(sccb + SCP_INCREMENT, 1);
+ stw_phys(sccb + SCP_RESPONSE_CODE, 0x10);
+ setcc(env, 0);
+
+ kvm_s390_interrupt_internal(env, KVM_S390_INT_SERVICE,
+ sccb & ~3, 0, 1);
+ break;
+ default:
+ dprintf("KVM: invalid sclp call 0x%x / 0x%lx\n", sccb, code);
+ r = -1;
+ break;
+ }
+
+out:
+ if (r < 0) {
+ setcc(env, 3);
+ }
+ return 0;
+}
+
+static int handle_priv(CPUState *env, struct kvm_run *run, uint8_t ipa1)
+{
+ int r = 0;
+ uint16_t ipbh0 = (run->s390_sieic.ipb & 0xffff0000) >> 16;
+
+ dprintf("KVM: PRIV: %d\n", ipa1);
+ switch (ipa1) {
+ case PRIV_SCLP_CALL:
+ r = sclp_service_call(env, run, ipbh0);
+ break;
+ default:
+ dprintf("KVM: unknown PRIV: 0x%x\n", ipa1);
+ r = -1;
+ break;
+ }
+
+ return r;
+}
+
+static int handle_hypercall(CPUState *env, struct kvm_run *run)
+{
+ int r;
+
+ cpu_synchronize_state(env);
+ r = s390_virtio_hypercall(env);
+ kvm_arch_put_registers(env);
+
+ return r;
+}
+
+static int handle_diag(CPUState *env, struct kvm_run *run, int ipb_code)
+{
+ int r = 0;
+
+ switch (ipb_code) {
+ case DIAG_KVM_HYPERCALL:
+ r = handle_hypercall(env, run);
+ break;
+ case DIAG_KVM_BREAKPOINT:
+ sleep(10);
+ break;
+ default:
+ dprintf("KVM: unknown DIAG: 0x%x\n", ipb_code);
+ r = -1;
+ break;
+ }
+
+ return r;
+}
+
+static int s390_cpu_restart(CPUState *env)
+{
+ kvm_s390_interrupt(env, KVM_S390_RESTART, 0);
+ env->halted = 0;
+ env->exception_index = 0;
+ qemu_cpu_kick(env);
+ dprintf("DONE: SIGP cpu restart: %p\n", env);
+ return 0;
+}
+
+static int s390_store_status(CPUState *env, uint32_t parameter)
+{
+ /* XXX */
+ fprintf(stderr, "XXX SIGP store status\n");
+ return -1;
+}
+
+static int s390_cpu_initial_reset(CPUState *env)
+{
+ /* XXX */
+ fprintf(stderr, "XXX SIGP init\n");
+ return -1;
+}
+
+static int handle_sigp(CPUState *env, struct kvm_run *run, uint8_t ipa1)
+{
+ uint8_t order_code;
+ uint32_t parameter;
+ uint16_t cpu_addr;
+ uint8_t t;
+ int r = -1;
+ CPUState *target_env;
+
+ cpu_synchronize_state(env);
+
+ /* get order code */
+ order_code = run->s390_sieic.ipb >> 28;
+ if (order_code > 0) {
+ order_code = env->regs[order_code];
+ }
+ order_code += (run->s390_sieic.ipb & 0x0fff0000) >> 16;
+
+ /* get parameters */
+ t = (ipa1 & 0xf0) >> 4;
+ if (!(t % 2)) {
+ t++;
+ }
+
+ parameter = env->regs[t] & 0x7ffffe00;
+ cpu_addr = env->regs[ipa1 & 0x0f];
+
+ target_env = s390_cpu_addr2state(cpu_addr);
+ if (!target_env) {
+ goto out;
+ }
+
+ switch (order_code) {
+ case SIGP_RESTART:
+ r = s390_cpu_restart(target_env);
+ break;
+ case SIGP_STORE_STATUS_ADDR:
+ r = s390_store_status(target_env, parameter);
+ break;
+ case SIGP_SET_ARCH:
+ /* make the caller panic */
+ return -1;
+ case SIGP_INITIAL_CPU_RESET:
+ r = s390_cpu_initial_reset(target_env);
+ break;
+ default:
+ fprintf(stderr, "KVM: unknown SIGP: 0x%x\n", ipa1);
+ break;
+ }
+
+out:
+ setcc(env, r ? 3 : 0);
+ return 0;
+}
+
+static int handle_instruction(CPUState *env, struct kvm_run *run)
+{
+ 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 = 0;
+
+ dprintf("handle_instruction 0x%x 0x%x\n", run->s390_sieic.ipa, run->s390_sieic.ipb);
+ switch (ipa0) {
+ case IPA0_PRIV:
+ r = handle_priv(env, run, ipa1);
+ break;
+ case IPA0_DIAG:
+ r = handle_diag(env, run, ipb_code);
+ break;
+ case IPA0_SIGP:
+ r = handle_sigp(env, run, ipa1);
+ break;
+ }
+
+ if (r < 0) {
+ enter_pgmcheck(env, 0x0001);
+ }
+ return r;
+}
+
+static int handle_intercept(CPUState *env)
+{
+ struct kvm_run *run = env->kvm_run;
+ int icpt_code = run->s390_sieic.icptcode;
+ int r = 0;
+
+ dprintf("intercept: 0x%x (at 0x%lx)\n", icpt_code, env->kvm_run->psw_addr);
+ switch (icpt_code) {
+ case ICPT_INSTRUCTION:
+ r = handle_instruction(env, run);
+ break;
+ case ICPT_WAITPSW:
+ /* XXX What to do on system shutdown? */
+ env->halted = 1;
+ env->exception_index = EXCP_HLT;
+ break;
+ case ICPT_SOFT_INTERCEPT:
+ fprintf(stderr, "KVM unimplemented icpt SOFT\n");
+ exit(1);
+ break;
+ case ICPT_CPU_STOP:
+ qemu_system_shutdown_request();
+ 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 *env, struct kvm_run *run)
+{
+ int ret = 0;
+
+ switch (run->exit_reason) {
+ case KVM_EXIT_S390_SIEIC:
+ ret = handle_intercept(env);
+ break;
+ case KVM_EXIT_S390_RESET:
+ fprintf(stderr, "RESET not implemented\n");
+ exit(1);
+ break;
+ default:
+ fprintf(stderr, "Unknown KVM exit: %d\n", run->exit_reason);
+ break;
+ }
+
+ return ret;
+}