kvm-vcpu 文件接口

最新推荐文章于 2024-01-28 11:01:17 发布

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最新推荐文章于 2024-01-28 11:01:17 发布

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分类专栏： Linux KVM

本文链接：https://blog.youkuaiyun.com/sunlei0625/article/details/57131699

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本文详细介绍了Linux内核KVM模块中虚拟CPU创建的过程，包括kvm_arch_vcpu_create函数用于初始化虚拟CPU结构，kvm_arch_vcpu_setup进行设置，kvm_create_vcpu_debugfs与create_vcpu_fd分别负责debugfs文件系统的创建及虚拟CPU文件描述符的建立。

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kvm_vm_ioctl_create_vcpu:
vcpu = kvm_arch_vcpu_create(kvm, id);
r = kvm_arch_vcpu_setup(vcpu);
r = kvm_create_vcpu_debugfs(vcpu);
r = create_vcpu_fd(vcpu);
kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
kvm_arch_vcpu_postcreate(vcpu);
linux-4.9/arch/x86/kvm/X86.c
struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
      unsigned int id)
{
 struct kvm_vcpu *vcpu;
 if (check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0)
  printk_once(KERN_WARNING
  "kvm: SMP vm created on host with unstable TSC; "
  "guest TSC will not be reliable\n");
 vcpu = kvm_x86_ops->vcpu_create(kvm, id);
 return vcpu;
}

int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
{
 int r;
 kvm_vcpu_mtrr_init(vcpu);
 r = vcpu_load(vcpu);
 if (r)
  return r;
 kvm_vcpu_reset(vcpu, false);
 kvm_mmu_setup(vcpu);
 vcpu_put(vcpu);
 return r;
}
Kvm_main.c linux-4.9/virt/kvm
static struct file_operations kvm_vcpu_fops = {
 .release        = kvm_vcpu_release,
 .unlocked_ioctl = kvm_vcpu_ioctl,
#ifdef CONFIG_KVM_COMPAT
 .compat_ioctl   = kvm_vcpu_compat_ioctl,
#endif
 .mmap           = kvm_vcpu_mmap,
 .llseek  = noop_llseek,
};
static int create_vcpu_fd(struct kvm_vcpu *vcpu)
{
 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC);
}