KVM: Portability: Add vcpu and hardware management arch hooks

Add the following hooks:

  void decache_vcpus_on_cpu(int cpu);
  int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu);
  void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu);
  void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu);
  void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu);
  void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu);
  struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id);
  void kvm_arch_vcpu_destory(struct kvm_vcpu *vcpu);
  int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu);
  void kvm_arch_hardware_enable(void *garbage);
  void kvm_arch_hardware_disable(void *garbage);
  int kvm_arch_hardware_setup(void);
  void kvm_arch_hardware_unsetup(void);
  void kvm_arch_check_processor_compat(void *rtn);

Signed-off-by: Zhang Xiantao <xiantao.zhang@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 157 insertions, 0 deletions

diff --git a/drivers/kvm/x86.c b/drivers/kvm/x86.c
index 2edc53ec8b3b..4902b35060f5 100644
--- a/drivers/kvm/x86.c
+++ b/drivers/kvm/x86.c
@@ -564,6 +564,41 @@ out:
         return r;
 }
 
+/*
+ * Make sure that a cpu that is being hot-unplugged does not have any vcpus
+ * cached on it.
+ */
+void decache_vcpus_on_cpu(int cpu)
+{
+        struct kvm *vm;
+        struct kvm_vcpu *vcpu;
+        int i;
+
+        spin_lock(&kvm_lock);
+        list_for_each_entry(vm, &vm_list, vm_list)
+                for (i = 0; i < KVM_MAX_VCPUS; ++i) {
+                        vcpu = vm->vcpus[i];
+                        if (!vcpu)
+                                continue;
+                        /*
+                         * If the vcpu is locked, then it is running on some
+                         * other cpu and therefore it is not cached on the
+                         * cpu in question.
+                         *
+                         * If it's not locked, check the last cpu it executed
+                         * on.
+                         */
+                        if (mutex_trylock(&vcpu->mutex)) {
+                                if (vcpu->cpu == cpu) {
+                                        kvm_x86_ops->vcpu_decache(vcpu);
+                                        vcpu->cpu = -1;
+                                }
+                                mutex_unlock(&vcpu->mutex);
+                        }
+                }
+        spin_unlock(&kvm_lock);
+}
+
 long kvm_arch_dev_ioctl(struct file *filp,
                         unsigned int ioctl, unsigned long arg)
 {
@@ -2319,3 +2354,125 @@ void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
         fx_restore(&vcpu->host_fx_image);
 }
 EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
+
+void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
+{
+        kvm_x86_ops->vcpu_free(vcpu);
+}
+
+struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
+                                                unsigned int id)
+{
+        int r;
+        struct kvm_vcpu *vcpu = kvm_x86_ops->vcpu_create(kvm, id);
+
+        if (IS_ERR(vcpu)) {
+                r = -ENOMEM;
+                goto fail;
+        }
+
+        /* We do fxsave: this must be aligned. */
+        BUG_ON((unsigned long)&vcpu->host_fx_image & 0xF);
+
+        vcpu_load(vcpu);
+        r = kvm_arch_vcpu_reset(vcpu);
+        if (r == 0)
+                r = kvm_mmu_setup(vcpu);
+        vcpu_put(vcpu);
+        if (r < 0)
+                goto free_vcpu;
+
+        return vcpu;
+free_vcpu:
+        kvm_x86_ops->vcpu_free(vcpu);
+fail:
+        return ERR_PTR(r);
+}
+
+void kvm_arch_vcpu_destory(struct kvm_vcpu *vcpu)
+{
+        vcpu_load(vcpu);
+        kvm_mmu_unload(vcpu);
+        vcpu_put(vcpu);
+
+        kvm_x86_ops->vcpu_free(vcpu);
+}
+
+int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
+{
+        return kvm_x86_ops->vcpu_reset(vcpu);
+}
+
+void kvm_arch_hardware_enable(void *garbage)
+{
+        kvm_x86_ops->hardware_enable(garbage);
+}
+
+void kvm_arch_hardware_disable(void *garbage)
+{
+        kvm_x86_ops->hardware_disable(garbage);
+}
+
+int kvm_arch_hardware_setup(void)
+{
+        return kvm_x86_ops->hardware_setup();
+}
+
+void kvm_arch_hardware_unsetup(void)
+{
+        kvm_x86_ops->hardware_unsetup();
+}
+
+void kvm_arch_check_processor_compat(void *rtn)
+{
+        kvm_x86_ops->check_processor_compatibility(rtn);
+}
+
+int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
+{
+        struct page *page;
+        struct kvm *kvm;
+        int r;
+
+        BUG_ON(vcpu->kvm == NULL);
+        kvm = vcpu->kvm;
+
+        vcpu->mmu.root_hpa = INVALID_PAGE;
+        if (!irqchip_in_kernel(kvm) || vcpu->vcpu_id == 0)
+                vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
+        else
+                vcpu->mp_state = VCPU_MP_STATE_UNINITIALIZED;
+
+        page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+        if (!page) {
+                r = -ENOMEM;
+                goto fail;
+        }
+        vcpu->pio_data = page_address(page);
+
+        r = kvm_mmu_create(vcpu);
+        if (r < 0)
+                goto fail_free_pio_data;
+
+        if (irqchip_in_kernel(kvm)) {
+                r = kvm_create_lapic(vcpu);
+                if (r < 0)
+                        goto fail_mmu_destroy;
+        }
+
+        return 0;
+
+fail_mmu_destroy:
+        kvm_mmu_destroy(vcpu);
+fail_free_pio_data:
+        free_page((unsigned long)vcpu->pio_data);
+fail:
+        return r;
+}
+
+void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
+{
+        kvm_free_lapic(vcpu);
+        kvm_mmu_destroy(vcpu);
+        free_page((unsigned long)vcpu->pio_data);
+}