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qemu/target-ppc/kvm.c

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/*
* PowerPC implementation of KVM hooks
*
* Copyright IBM Corp. 2007
*
* Authors:
* Jerone Young <jyoung5@us.ibm.com>
* Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
* Hollis Blanchard <hollisb@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <linux/kvm.h>
#include "qemu-common.h"
#include "qemu-timer.h"
#include "sysemu.h"
#include "kvm.h"
#include "kvm_ppc.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
const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
KVM_CAP_LAST_INFO
};
static int cap_interrupt_unset = false;
static int cap_interrupt_level = false;
/* XXX We have a race condition where we actually have a level triggered
* interrupt, but the infrastructure can't expose that yet, so the guest
* takes but ignores it, goes to sleep and never gets notified that there's
* still an interrupt pending.
*
* As a quick workaround, let's just wake up again 20 ms after we injected
* an interrupt. That way we can assure that we're always reinjecting
* interrupts in case the guest swallowed them.
*/
static QEMUTimer *idle_timer;
static void kvm_kick_env(void *env)
{
qemu_cpu_kick(env);
}
int kvm_arch_init(KVMState *s)
{
#ifdef KVM_CAP_PPC_UNSET_IRQ
cap_interrupt_unset = kvm_check_extension(s, KVM_CAP_PPC_UNSET_IRQ);
#endif
#ifdef KVM_CAP_PPC_IRQ_LEVEL
cap_interrupt_level = kvm_check_extension(s, KVM_CAP_PPC_IRQ_LEVEL);
#endif
if (!cap_interrupt_level) {
fprintf(stderr, "KVM: Couldn't find level irq capability. Expect the "
"VM to stall at times!\n");
}
return 0;
}
int kvm_arch_init_vcpu(CPUState *cenv)
{
int ret = 0;
struct kvm_sregs sregs;
sregs.pvr = cenv->spr[SPR_PVR];
ret = kvm_vcpu_ioctl(cenv, KVM_SET_SREGS, &sregs);
idle_timer = qemu_new_timer_ns(vm_clock, kvm_kick_env, cenv);
return ret;
}
void kvm_arch_reset_vcpu(CPUState *env)
{
}
int kvm_arch_put_registers(CPUState *env, int level)
{
struct kvm_regs regs;
int ret;
int i;
ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
if (ret < 0)
return ret;
regs.ctr = env->ctr;
regs.lr = env->lr;
regs.xer = env->xer;
regs.msr = env->msr;
regs.pc = env->nip;
regs.srr0 = env->spr[SPR_SRR0];
regs.srr1 = env->spr[SPR_SRR1];
regs.sprg0 = env->spr[SPR_SPRG0];
regs.sprg1 = env->spr[SPR_SPRG1];
regs.sprg2 = env->spr[SPR_SPRG2];
regs.sprg3 = env->spr[SPR_SPRG3];
regs.sprg4 = env->spr[SPR_SPRG4];
regs.sprg5 = env->spr[SPR_SPRG5];
regs.sprg6 = env->spr[SPR_SPRG6];
regs.sprg7 = env->spr[SPR_SPRG7];
for (i = 0;i < 32; i++)
regs.gpr[i] = env->gpr[i];
ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, &regs);
if (ret < 0)
return ret;
return ret;
}
int kvm_arch_get_registers(CPUState *env)
{
struct kvm_regs regs;
struct kvm_sregs sregs;
int i, ret;
ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
if (ret < 0)
return ret;
ret = kvm_vcpu_ioctl(env, KVM_GET_SREGS, &sregs);
if (ret < 0)
return ret;
env->ctr = regs.ctr;
env->lr = regs.lr;
env->xer = regs.xer;
env->msr = regs.msr;
env->nip = regs.pc;
env->spr[SPR_SRR0] = regs.srr0;
env->spr[SPR_SRR1] = regs.srr1;
env->spr[SPR_SPRG0] = regs.sprg0;
env->spr[SPR_SPRG1] = regs.sprg1;
env->spr[SPR_SPRG2] = regs.sprg2;
env->spr[SPR_SPRG3] = regs.sprg3;
env->spr[SPR_SPRG4] = regs.sprg4;
env->spr[SPR_SPRG5] = regs.sprg5;
env->spr[SPR_SPRG6] = regs.sprg6;
env->spr[SPR_SPRG7] = regs.sprg7;
for (i = 0;i < 32; i++)
env->gpr[i] = regs.gpr[i];
#ifdef KVM_CAP_PPC_SEGSTATE
if (kvm_check_extension(env->kvm_state, KVM_CAP_PPC_SEGSTATE)) {
ppc_store_sdr1(env, sregs.u.s.sdr1);
/* Sync SLB */
#ifdef TARGET_PPC64
for (i = 0; i < 64; i++) {
ppc_store_slb(env, sregs.u.s.ppc64.slb[i].slbe,
sregs.u.s.ppc64.slb[i].slbv);
}
#endif
/* Sync SRs */
for (i = 0; i < 16; i++) {
env->sr[i] = sregs.u.s.ppc32.sr[i];
}
/* Sync BATs */
for (i = 0; i < 8; i++) {
env->DBAT[0][i] = sregs.u.s.ppc32.dbat[i] & 0xffffffff;
env->DBAT[1][i] = sregs.u.s.ppc32.dbat[i] >> 32;
env->IBAT[0][i] = sregs.u.s.ppc32.ibat[i] & 0xffffffff;
env->IBAT[1][i] = sregs.u.s.ppc32.ibat[i] >> 32;
}
}
#endif
return 0;
}
int kvmppc_set_interrupt(CPUState *env, int irq, int level)
{
unsigned virq = level ? KVM_INTERRUPT_SET_LEVEL : KVM_INTERRUPT_UNSET;
if (irq != PPC_INTERRUPT_EXT) {
return 0;
}
if (!kvm_enabled() || !cap_interrupt_unset || !cap_interrupt_level) {
return 0;
}
kvm_vcpu_ioctl(env, KVM_INTERRUPT, &virq);
return 0;
}
#if defined(TARGET_PPCEMB)
#define PPC_INPUT_INT PPC40x_INPUT_INT
#elif defined(TARGET_PPC64)
#define PPC_INPUT_INT PPC970_INPUT_INT
#else
#define PPC_INPUT_INT PPC6xx_INPUT_INT
#endif
void kvm_arch_pre_run(CPUState *env, struct kvm_run *run)
{
int r;
unsigned irq;
/* PowerPC Qemu tracks the various core input pins (interrupt, critical
* interrupt, reset, etc) in PPC-specific env->irq_input_state. */
if (!cap_interrupt_level &&
run->ready_for_interrupt_injection &&
(env->interrupt_request & CPU_INTERRUPT_HARD) &&
(env->irq_input_state & (1<<PPC_INPUT_INT)))
{
/* For now KVM disregards the 'irq' argument. However, in the
* future KVM could cache it in-kernel to avoid a heavyweight exit
* when reading the UIC.
*/
irq = KVM_INTERRUPT_SET;
dprintf("injected interrupt %d\n", irq);
r = kvm_vcpu_ioctl(env, KVM_INTERRUPT, &irq);
if (r < 0)
printf("cpu %d fail inject %x\n", env->cpu_index, irq);
/* Always wake up soon in case the interrupt was level based */
qemu_mod_timer(idle_timer, qemu_get_clock_ns(vm_clock) +
(get_ticks_per_sec() / 50));
}
/* We don't know if there are more interrupts pending after this. However,
* the guest will return to userspace in the course of handling this one
* anyways, so we will get a chance to deliver the rest. */
}
void kvm_arch_post_run(CPUState *env, struct kvm_run *run)
{
}
int kvm_arch_process_async_events(CPUState *env)
{
return 0;
}
static int kvmppc_handle_halt(CPUState *env)
{
if (!(env->interrupt_request & CPU_INTERRUPT_HARD) && (msr_ee)) {
env->halted = 1;
env->exception_index = EXCP_HLT;
}
return 0;
}
/* map dcr access to existing qemu dcr emulation */
static int kvmppc_handle_dcr_read(CPUState *env, uint32_t dcrn, uint32_t *data)
{
if (ppc_dcr_read(env->dcr_env, dcrn, data) < 0)
fprintf(stderr, "Read to unhandled DCR (0x%x)\n", dcrn);
return 0;
}
static int kvmppc_handle_dcr_write(CPUState *env, uint32_t dcrn, uint32_t data)
{
if (ppc_dcr_write(env->dcr_env, dcrn, data) < 0)
fprintf(stderr, "Write to unhandled DCR (0x%x)\n", dcrn);
return 0;
}
int kvm_arch_handle_exit(CPUState *env, struct kvm_run *run)
{
int ret;
switch (run->exit_reason) {
case KVM_EXIT_DCR:
if (run->dcr.is_write) {
dprintf("handle dcr write\n");
ret = kvmppc_handle_dcr_write(env, run->dcr.dcrn, run->dcr.data);
} else {
dprintf("handle dcr read\n");
ret = kvmppc_handle_dcr_read(env, run->dcr.dcrn, &run->dcr.data);
}
break;
case KVM_EXIT_HLT:
dprintf("handle halt\n");
ret = kvmppc_handle_halt(env);
break;
default:
fprintf(stderr, "KVM: unknown exit reason %d\n", run->exit_reason);
ret = -1;
break;
}
return ret;
}
static int read_cpuinfo(const char *field, char *value, int len)
{
FILE *f;
int ret = -1;
int field_len = strlen(field);
char line[512];
f = fopen("/proc/cpuinfo", "r");
if (!f) {
return -1;
}
do {
if(!fgets(line, sizeof(line), f)) {
break;
}
if (!strncmp(line, field, field_len)) {
strncpy(value, line, len);
ret = 0;
break;
}
} while(*line);
fclose(f);
return ret;
}
uint32_t kvmppc_get_tbfreq(void)
{
char line[512];
char *ns;
uint32_t retval = get_ticks_per_sec();
if (read_cpuinfo("timebase", line, sizeof(line))) {
return retval;
}
if (!(ns = strchr(line, ':'))) {
return retval;
}
ns++;
retval = atoi(ns);
return retval;
}
int kvmppc_get_hypercall(CPUState *env, uint8_t *buf, int buf_len)
{
uint32_t *hc = (uint32_t*)buf;
#ifdef KVM_CAP_PPC_GET_PVINFO
struct kvm_ppc_pvinfo pvinfo;
if (kvm_check_extension(env->kvm_state, KVM_CAP_PPC_GET_PVINFO) &&
!kvm_vm_ioctl(env->kvm_state, KVM_PPC_GET_PVINFO, &pvinfo)) {
memcpy(buf, pvinfo.hcall, buf_len);
return 0;
}
#endif
/*
* Fallback to always fail hypercalls:
*
* li r3, -1
* nop
* nop
* nop
*/
hc[0] = 0x3860ffff;
hc[1] = 0x60000000;
hc[2] = 0x60000000;
hc[3] = 0x60000000;
return 0;
}
bool kvm_arch_stop_on_emulation_error(CPUState *env)
{
return true;
}
int kvm_arch_on_sigbus_vcpu(CPUState *env, int code, void *addr)
{
return 1;
}
int kvm_arch_on_sigbus(int code, void *addr)
{
return 1;
}
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