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Re: [Qemu-devel] Does kvm_fd mean KVM or VCPU fd?

From: Paolo Bonzini
Subject: Re: [Qemu-devel] Does kvm_fd mean KVM or VCPU fd?
Date: Thu, 14 Jun 2012 11:15:06 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120605 Thunderbird/13.0

Il 14/06/2012 10:24, 陳韋任 (Wei-Ren Chen) ha scritto:
> Hi all,
>   While reading KVM releated code in QEMU, I found the name of one
> field in CPU_COMMON (cpu-defs.h), i.e. kvm_fd, might be misleading.
> See the code below,
> ---
> int kvm_init_vcpu(CPUArchState *env)
> {
>     ret = kvm_vm_ioctl(s, KVM_CREATE_VCPU, env->cpu_index);
>     env->kvm_fd = ret; /* VCPU fd? */
> }
> ---
>   I think KVM_CREATE_VCPU should return VCPU fd, right? AFAIK, in KVM
> world, kvm_fd usually means the fd we get after opening "/dev/kvm".
> Just want to make sure I understand the code correcly. Thanks.

This is the kvm_fd inside struct CPUState, so it's per-CPU.


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