From: Jason Wang <jasowang@redhat.com>
To: Yongji Xie <xieyongji@bytedance.com>
Cc: axboe@kernel.dk, corbet@lwn.net, kvm@vger.kernel.org,
"Michael S. Tsirkin" <mst@redhat.com>,
linux-aio@kvack.org, netdev@vger.kernel.org,
Randy Dunlap <rdunlap@infradead.org>,
Matthew Wilcox <willy@infradead.org>,
virtualization@lists.linux-foundation.org, linux-mm@kvack.org,
bcrl@kvack.org, viro@zeniv.linux.org.uk,
Stefan Hajnoczi <stefanha@redhat.com>,
linux-fsdevel@vger.kernel.org, akpm@linux-foundation.org
Subject: Re: [RFC v2 09/13] vduse: Add support for processing vhost iotlb message
Date: Mon, 28 Dec 2020 16:43:18 +0800 [thread overview]
Message-ID: <e77c97c5-6bdc-cdd0-62c0-6ff75f6dbdff@redhat.com> (raw)
In-Reply-To: <CACycT3uDV43ecScrMh1QVpStuwDETHykJzzY=pkmZjP2Dd2kvg@mail.gmail.com>
On 2020/12/28 下午4:14, Yongji Xie wrote:
>> I see. So all the above two questions are because VHOST_IOTLB_INVALIDATE
>> is expected to be synchronous. This need to be solved by tweaking the
>> current VDUSE API or we can re-visit to go with descriptors relaying first.
>>
> Actually all vdpa related operations are synchronous in current
> implementation. The ops.set_map/dma_map/dma_unmap should not return
> until the VDUSE_UPDATE_IOTLB/VDUSE_INVALIDATE_IOTLB message is replied
> by userspace. Could it solve this problem?
I was thinking whether or not we need to generate IOTLB_INVALIDATE
message to VDUSE during dma_unmap (vduse_dev_unmap_page).
If we don't, we're probably fine.
Thanks
>
> Thanks,
> Yongji
>
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next prev parent reply other threads:[~2020-12-28 8:43 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20201222145221.711-1-xieyongji@bytedance.com>
[not found] ` <20201222145221.711-2-xieyongji@bytedance.com>
2020-12-22 15:44 ` [RFC v2 01/13] mm: export zap_page_range() for driver use Christoph Hellwig
2020-12-23 6:38 ` [RFC v2 00/13] Introduce VDUSE - vDPA Device in Userspace Jason Wang
2020-12-23 8:14 ` Jason Wang
[not found] ` <CACycT3tr-1EDeH4j0AojD+-qM5yqDUU0tQHieVUXgL7AOTHyvQ@mail.gmail.com>
2020-12-24 2:24 ` Jason Wang
[not found] ` <20201222145221.711-7-xieyongji@bytedance.com>
2020-12-23 8:08 ` [RFC v2 06/13] vduse: " Jason Wang
[not found] ` <CACycT3vYb_CdWz3wZ1OY=KynG=1qZgaa_Ngko2AO0JHn_fFXEA@mail.gmail.com>
2020-12-24 3:01 ` Jason Wang
[not found] ` <CACycT3uKb1P7zXyCBYWDb6VhGXV0cdJPH3CPcRzjwz57tyODgA@mail.gmail.com>
2020-12-25 6:59 ` Jason Wang
2021-01-08 13:32 ` Bob Liu
[not found] ` <20201222145221.711-9-xieyongji@bytedance.com>
2020-12-23 8:36 ` [RFC v2 08/13] vdpa: Introduce process_iotlb_msg() in vdpa_config_ops Jason Wang
[not found] ` <CACycT3tP8mgj043idjJW3BF12qmOhmHzYz8X5FyL8t5MbwLysw@mail.gmail.com>
2020-12-24 2:36 ` Jason Wang
[not found] ` <20201222145221.711-10-xieyongji@bytedance.com>
2020-12-23 9:05 ` [RFC v2 09/13] vduse: Add support for processing vhost iotlb message Jason Wang
[not found] ` <CACycT3vVU9vg6R6UujSnSdk8cwxWPVgeJJs0JaBH_Zg4xC-epQ@mail.gmail.com>
2020-12-24 2:41 ` [External] " Jason Wang
[not found] ` <CACycT3s=m=PQb5WFoMGhz8TNGme4+=rmbbBTtrugF9ZmNnWxEw@mail.gmail.com>
2020-12-25 6:57 ` Jason Wang
[not found] ` <CACycT3uwXBYvRbKDWdN3oCekv+o6_Lc=-KTrxejD=fr-zgibGw@mail.gmail.com>
2020-12-28 7:43 ` Jason Wang
[not found] ` <CACycT3uDV43ecScrMh1QVpStuwDETHykJzzY=pkmZjP2Dd2kvg@mail.gmail.com>
2020-12-28 8:43 ` Jason Wang [this message]
[not found] ` <CACycT3soQoX5avZiFBLEGBuJpdni6-UxdhAPGpWHBWVf+dEySg@mail.gmail.com>
2020-12-29 9:11 ` Jason Wang
[not found] ` <CACycT3sg61yRdupnD+jQEkWKsVEvMWfhkJ=5z_bYZLxCibDiHw@mail.gmail.com>
2020-12-30 6:10 ` Jason Wang
[not found] ` <CACycT3vZ7V5WWhCFLBK6FuvVNmPmMj_yc=COOB4cjjC13yHUwg@mail.gmail.com>
2020-12-30 8:41 ` Jason Wang
[not found] ` <CACycT3tD3zyvV6Zy5NT4x=02hBgrRGq35xeTsRXXx-_wPGJXpQ@mail.gmail.com>
2020-12-31 2:49 ` Jason Wang
[not found] ` <CACycT3vwMU5R7N8dZFBYX4-bxe2YT7EfK_M_jEkH8wzfH_GkBw@mail.gmail.com>
2020-12-31 5:49 ` Jason Wang
[not found] ` <CACycT3tc2P63k6J9ZkWTpPvHk_H8zUq0_Q6WOqYX_dSigUAnzA@mail.gmail.com>
2020-12-31 7:11 ` Jason Wang
[not found] ` <CACycT3tLG=13fDdY0YPzViK2-AUy5F+uJor2cmVDFOGjXTOaYA@mail.gmail.com>
2020-12-25 7:02 ` Jason Wang
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