target-ppc: Enable KVM for ppcemb.

Implement hooks called by generic KVM code.

Also add code that will copy the host's CPU and timebase frequencies to the
guest, which is necessary on KVM because the guest can directly access the
timebase.

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Acked-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6065 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 204 insertions, 0 deletions

diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c
new file mode 100644
index 0000000..acbb1ab
--- /dev/null
+++ b/target-ppc/kvm.c
@@ -0,0 +1,204 @@
+/*
+ * 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
+
+int kvm_arch_init(KVMState *s, int smp_cpus)
+{
+    return 0;
+}
+
+int kvm_arch_init_vcpu(CPUState *cenv)
+{
+    return 0;
+}
+
+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;
+
+    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;
+    uint32_t i, ret;
+
+    ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
+    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];
+
+    return 0;
+}
+
+int 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 (run->ready_for_interrupt_injection &&
+        (env->interrupt_request & CPU_INTERRUPT_HARD) &&
+        (env->irq_input_state & (1<<PPC40x_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 = -1U;
+
+        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);
+    }
+
+    /* 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. */
+    return 0;
+}
+
+int kvm_arch_post_run(CPUState *env, struct kvm_run *run)
+{
+    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 1;
+}
+
+/* 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 1;
+}
+
+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 1;
+}
+
+int kvm_arch_handle_exit(CPUState *env, struct kvm_run *run)
+{
+    int ret = 0;
+
+    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;
+    }
+
+    return ret;
+}
+