KVM: ppc: PowerPC 440 KVM implementation
This functionality is definitely experimental, but is capable of running
unmodified PowerPC 440 Linux kernels as guests on a PowerPC 440 host. (Only
tested with 440EP "Bamboo" guests so far, but with appropriate userspace
support other SoC/board combinations should work.)
See Documentation/powerpc/kvm_440.txt for technical details.
[stephen: build fix]
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Avi Kivity <avi@qumranet.com>
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
new file mode 100644
index 0000000..bad40bd
--- /dev/null
+++ b/arch/powerpc/kvm/powerpc.c
@@ -0,0 +1,436 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Copyright IBM Corp. 2007
+ *
+ * Authors: Hollis Blanchard <hollisb@us.ibm.com>
+ * Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
+ */
+
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/kvm_host.h>
+#include <linux/module.h>
+#include <linux/vmalloc.h>
+#include <linux/fs.h>
+#include <asm/cputable.h>
+#include <asm/uaccess.h>
+#include <asm/kvm_ppc.h>
+
+
+gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
+{
+ return gfn;
+}
+
+int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
+{
+ /* XXX implement me */
+ return 0;
+}
+
+int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
+{
+ return 1;
+}
+
+
+int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
+{
+ enum emulation_result er;
+ int r;
+
+ er = kvmppc_emulate_instruction(run, vcpu);
+ switch (er) {
+ case EMULATE_DONE:
+ /* Future optimization: only reload non-volatiles if they were
+ * actually modified. */
+ r = RESUME_GUEST_NV;
+ break;
+ case EMULATE_DO_MMIO:
+ run->exit_reason = KVM_EXIT_MMIO;
+ /* We must reload nonvolatiles because "update" load/store
+ * instructions modify register state. */
+ /* Future optimization: only reload non-volatiles if they were
+ * actually modified. */
+ r = RESUME_HOST_NV;
+ break;
+ case EMULATE_FAIL:
+ /* XXX Deliver Program interrupt to guest. */
+ printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
+ vcpu->arch.last_inst);
+ r = RESUME_HOST;
+ break;
+ default:
+ BUG();
+ }
+
+ return r;
+}
+
+void kvm_arch_hardware_enable(void *garbage)
+{
+}
+
+void kvm_arch_hardware_disable(void *garbage)
+{
+}
+
+int kvm_arch_hardware_setup(void)
+{
+ return 0;
+}
+
+void kvm_arch_hardware_unsetup(void)
+{
+}
+
+void kvm_arch_check_processor_compat(void *rtn)
+{
+ int r;
+
+ if (strcmp(cur_cpu_spec->platform, "ppc440") == 0)
+ r = 0;
+ else
+ r = -ENOTSUPP;
+
+ *(int *)rtn = r;
+}
+
+struct kvm *kvm_arch_create_vm(void)
+{
+ struct kvm *kvm;
+
+ kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
+ if (!kvm)
+ return ERR_PTR(-ENOMEM);
+
+ return kvm;
+}
+
+static void kvmppc_free_vcpus(struct kvm *kvm)
+{
+ unsigned int i;
+
+ for (i = 0; i < KVM_MAX_VCPUS; ++i) {
+ if (kvm->vcpus[i]) {
+ kvm_arch_vcpu_free(kvm->vcpus[i]);
+ kvm->vcpus[i] = NULL;
+ }
+ }
+}
+
+void kvm_arch_destroy_vm(struct kvm *kvm)
+{
+ kvmppc_free_vcpus(kvm);
+ kvm_free_physmem(kvm);
+ kfree(kvm);
+}
+
+int kvm_dev_ioctl_check_extension(long ext)
+{
+ int r;
+
+ switch (ext) {
+ case KVM_CAP_USER_MEMORY:
+ r = 1;
+ break;
+ default:
+ r = 0;
+ break;
+ }
+ return r;
+
+}
+
+long kvm_arch_dev_ioctl(struct file *filp,
+ unsigned int ioctl, unsigned long arg)
+{
+ return -EINVAL;
+}
+
+int kvm_arch_set_memory_region(struct kvm *kvm,
+ struct kvm_userspace_memory_region *mem,
+ struct kvm_memory_slot old,
+ int user_alloc)
+{
+ return 0;
+}
+
+struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
+{
+ struct kvm_vcpu *vcpu;
+ int err;
+
+ vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
+ if (!vcpu) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ err = kvm_vcpu_init(vcpu, kvm, id);
+ if (err)
+ goto free_vcpu;
+
+ return vcpu;
+
+free_vcpu:
+ kmem_cache_free(kvm_vcpu_cache, vcpu);
+out:
+ return ERR_PTR(err);
+}
+
+void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
+{
+ kvm_vcpu_uninit(vcpu);
+ kmem_cache_free(kvm_vcpu_cache, vcpu);
+}
+
+void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
+{
+ kvm_arch_vcpu_free(vcpu);
+}
+
+int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
+{
+ unsigned int priority = exception_priority[BOOKE_INTERRUPT_DECREMENTER];
+
+ return test_bit(priority, &vcpu->arch.pending_exceptions);
+}
+
+static void kvmppc_decrementer_func(unsigned long data)
+{
+ struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
+
+ kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_DECREMENTER);
+}
+
+int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
+{
+ setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
+ (unsigned long)vcpu);
+
+ return 0;
+}
+
+void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
+{
+}
+
+void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
+{
+}
+
+void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
+{
+}
+
+void decache_vcpus_on_cpu(int cpu)
+{
+}
+
+int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
+ struct kvm_debug_guest *dbg)
+{
+ return -ENOTSUPP;
+}
+
+static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
+ struct kvm_run *run)
+{
+ u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
+ *gpr = run->dcr.data;
+}
+
+static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
+ struct kvm_run *run)
+{
+ u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
+
+ if (run->mmio.len > sizeof(*gpr)) {
+ printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
+ return;
+ }
+
+ if (vcpu->arch.mmio_is_bigendian) {
+ switch (run->mmio.len) {
+ case 4: *gpr = *(u32 *)run->mmio.data; break;
+ case 2: *gpr = *(u16 *)run->mmio.data; break;
+ case 1: *gpr = *(u8 *)run->mmio.data; break;
+ }
+ } else {
+ /* Convert BE data from userland back to LE. */
+ switch (run->mmio.len) {
+ case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
+ case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
+ case 1: *gpr = *(u8 *)run->mmio.data; break;
+ }
+ }
+}
+
+int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
+ unsigned int rt, unsigned int bytes, int is_bigendian)
+{
+ if (bytes > sizeof(run->mmio.data)) {
+ printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
+ run->mmio.len);
+ }
+
+ run->mmio.phys_addr = vcpu->arch.paddr_accessed;
+ run->mmio.len = bytes;
+ run->mmio.is_write = 0;
+
+ vcpu->arch.io_gpr = rt;
+ vcpu->arch.mmio_is_bigendian = is_bigendian;
+ vcpu->mmio_needed = 1;
+ vcpu->mmio_is_write = 0;
+
+ return EMULATE_DO_MMIO;
+}
+
+int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
+ u32 val, unsigned int bytes, int is_bigendian)
+{
+ void *data = run->mmio.data;
+
+ if (bytes > sizeof(run->mmio.data)) {
+ printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
+ run->mmio.len);
+ }
+
+ run->mmio.phys_addr = vcpu->arch.paddr_accessed;
+ run->mmio.len = bytes;
+ run->mmio.is_write = 1;
+ vcpu->mmio_needed = 1;
+ vcpu->mmio_is_write = 1;
+
+ /* Store the value at the lowest bytes in 'data'. */
+ if (is_bigendian) {
+ switch (bytes) {
+ case 4: *(u32 *)data = val; break;
+ case 2: *(u16 *)data = val; break;
+ case 1: *(u8 *)data = val; break;
+ }
+ } else {
+ /* Store LE value into 'data'. */
+ switch (bytes) {
+ case 4: st_le32(data, val); break;
+ case 2: st_le16(data, val); break;
+ case 1: *(u8 *)data = val; break;
+ }
+ }
+
+ return EMULATE_DO_MMIO;
+}
+
+int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
+{
+ int r;
+ sigset_t sigsaved;
+
+ if (vcpu->sigset_active)
+ sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
+
+ if (vcpu->mmio_needed) {
+ if (!vcpu->mmio_is_write)
+ kvmppc_complete_mmio_load(vcpu, run);
+ vcpu->mmio_needed = 0;
+ } else if (vcpu->arch.dcr_needed) {
+ if (!vcpu->arch.dcr_is_write)
+ kvmppc_complete_dcr_load(vcpu, run);
+ vcpu->arch.dcr_needed = 0;
+ }
+
+ kvmppc_check_and_deliver_interrupts(vcpu);
+
+ local_irq_disable();
+ kvm_guest_enter();
+ r = __kvmppc_vcpu_run(run, vcpu);
+ kvm_guest_exit();
+ local_irq_enable();
+
+ if (vcpu->sigset_active)
+ sigprocmask(SIG_SETMASK, &sigsaved, NULL);
+
+ return r;
+}
+
+int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
+{
+ kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_EXTERNAL);
+ return 0;
+}
+
+int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
+ struct kvm_mp_state *mp_state)
+{
+ return -EINVAL;
+}
+
+int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
+ struct kvm_mp_state *mp_state)
+{
+ return -EINVAL;
+}
+
+long kvm_arch_vcpu_ioctl(struct file *filp,
+ unsigned int ioctl, unsigned long arg)
+{
+ struct kvm_vcpu *vcpu = filp->private_data;
+ void __user *argp = (void __user *)arg;
+ long r;
+
+ switch (ioctl) {
+ case KVM_INTERRUPT: {
+ struct kvm_interrupt irq;
+ r = -EFAULT;
+ if (copy_from_user(&irq, argp, sizeof(irq)))
+ goto out;
+ r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
+ break;
+ }
+ default:
+ r = -EINVAL;
+ }
+
+out:
+ return r;
+}
+
+int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
+{
+ return -ENOTSUPP;
+}
+
+long kvm_arch_vm_ioctl(struct file *filp,
+ unsigned int ioctl, unsigned long arg)
+{
+ long r;
+
+ switch (ioctl) {
+ default:
+ r = -EINVAL;
+ }
+
+ return r;
+}
+
+int kvm_arch_init(void *opaque)
+{
+ return 0;
+}
+
+void kvm_arch_exit(void)
+{
+}