linux-kernel - Re: [PATCH 2/2] vhost: re-introducing metadata acceleration through kernel virtual address

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Message-ID: <cd2ed116-4b19-73b2-a3f0-4377cc0f2db3@redhat.com>
Date:   Fri, 6 Sep 2019 20:51:29 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Hillf Danton <hdanton@...a.com>
Cc:     mst@...hat.com, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, jgg@...lanox.com,
        aarcange@...hat.com, jglisse@...hat.com, linux-mm@...ck.org,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        Christoph Hellwig <hch@...radead.org>,
        David Miller <davem@...emloft.net>,
        linux-arm-kernel@...ts.infradead.org, linux-parisc@...r.kernel.org
Subject: Re: [PATCH 2/2] vhost: re-introducing metadata acceleration through
 kernel virtual address


On 2019/9/6 上午11:21, Hillf Danton wrote:
> On Thu,  5 Sep 2019 20:27:36 +0800 From:   Jason Wang <jasowang@...hat.com>
>> +static void vhost_set_map_dirty(struct vhost_virtqueue *vq,
>> +				struct vhost_map *map, int index)
>> +{
>> +	struct vhost_uaddr *uaddr = &vq->uaddrs[index];
>> +	int i;
>> +
>> +	if (uaddr->write) {
>> +		for (i = 0; i < map->npages; i++)
>> +			set_page_dirty(map->pages[i]);
>> +	}
> Not sure need to set page dirty under page lock.


Just to make sure I understand the issue. Do you mean there's no need 
for set_page_dirty() here? If yes, is there any other function that 
already did this?

Thanks