linux-kernel - Re: [PATCH net-next V4 5/5] vhost: access vq metadata through kernel virtual address

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Message-ID: <4f4da5d5-0493-9da4-5ede-e344535bbb65@redhat.com>
Date:   Fri, 25 Jan 2019 17:24:16 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        aarcange@...hat.com
Subject: Re: [PATCH net-next V4 5/5] vhost: access vq metadata through kernel
 virtual address


On 2019/1/25 上午11:03, Michael S. Tsirkin wrote:
>> +/* Suppress the vma that needs writeback since we can not track dirty
>> + * pages now.
>> + */
>> +static bool vma_can_vmap(struct vm_area_struct *vma)
>> +{
>> +	return vma_is_anonymous(vma) || is_vm_hugetlb_page(vma) ||
>> +	       vma_is_shmem(vma);
>> +}
>> +
> IIUC a second but anonymous memory needs writeback too, just to swap.
> I'm not an MM person so I might be off.


Right, my fault, I mean the vma that needs dirty page tracking.

Thanks