From: "Michael S. Tsirkin" <mst@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Liang, Cunming" <cunming.liang@intel.com>,
"Bie, Tiwei" <tiwei.bie@intel.com>,
"jasowang@redhat.com" <jasowang@redhat.com>,
"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"stefanha@redhat.com" <stefanha@redhat.com>,
"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
"virtio-dev@lists.oasis-open.org"
<virtio-dev@lists.oasis-open.org>,
"Daly, Dan" <dan.daly@intel.com>,
"Tan, Jianfeng" <jianfeng.tan@intel.com>,
"Wang, Zhihong" <zhihong.wang@intel.com>,
"Wang, Xiao W" <xiao.w.wang@intel.com>
Subject: [virtio-dev] Re: [PATCH v3 6/6] vhost-user: support registering external host notifiers
Date: Thu, 19 Apr 2018 19:34:57 +0300 [thread overview]
Message-ID: <20180419190000-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <f123c3a5-f7a3-a0e3-ffc7-b57e19610a9b@redhat.com>
On Thu, Apr 19, 2018 at 05:52:23PM +0200, Paolo Bonzini wrote:
> On 19/04/2018 17:42, Michael S. Tsirkin wrote:
> >> A compiler barrier is enough on strongly-ordered memory platform.
> >> As it doesn't re-order store, PCI device won't see a stale index
> >> value. But a weakly-ordered memory needs sfence.
> >
> > Oh you are right.
> >
> > So it's only needed for non-intel platforms or when packets are in
> > WC memory then. And I don't know whether dpdk ever puts packets in WC
> > memory.
> >
> > I guess we'll cross this bridge when we get to it.
>
> Non-TSO architectures seem important...
>
> Paolo
Only if there are virtio offload engines on platforms with these
architectures :) Worth working on for sure but doesn't have to block
this patchset.
--
MST
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next prev parent reply other threads:[~2018-04-19 16:35 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-12 15:12 [virtio-dev] [PATCH v3 0/6] Extend vhost-user to support registering external host notifiers Tiwei Bie
2018-04-12 15:12 ` [virtio-dev] [PATCH v3 1/6] vhost-user: add Net prefix to internal state structure Tiwei Bie
2018-04-12 15:12 ` [virtio-dev] [PATCH v3 2/6] vhost-user: introduce shared vhost-user state Tiwei Bie
2018-05-23 13:44 ` [virtio-dev] " Michael S. Tsirkin
2018-05-23 15:36 ` Michael S. Tsirkin
2018-05-23 15:43 ` Michael S. Tsirkin
2018-05-23 23:21 ` Tiwei Bie
2018-05-24 2:24 ` Tiwei Bie
2018-05-24 7:03 ` Tiwei Bie
2018-05-24 10:59 ` Tiwei Bie
2018-05-24 13:55 ` Michael S. Tsirkin
2018-05-24 14:54 ` Tiwei Bie
2018-05-24 14:30 ` Michael S. Tsirkin
2018-05-24 15:22 ` Tiwei Bie
2018-05-24 13:50 ` Michael S. Tsirkin
2018-04-12 15:12 ` [virtio-dev] [PATCH v3 3/6] vhost-user: support receiving file descriptors in slave_read Tiwei Bie
2018-05-23 21:25 ` [virtio-dev] " Michael S. Tsirkin
2018-05-23 23:12 ` Tiwei Bie
2018-05-24 13:48 ` Michael S. Tsirkin
2018-05-24 14:56 ` Tiwei Bie
2018-04-12 15:12 ` [virtio-dev] [PATCH v3 4/6] virtio: support setting memory region based host notifier Tiwei Bie
2018-04-12 15:12 ` [virtio-dev] [PATCH v3 5/6] vhost: allow backends to filter memory sections Tiwei Bie
2018-04-12 15:12 ` [virtio-dev] [PATCH v3 6/6] vhost-user: support registering external host notifiers Tiwei Bie
2018-04-18 16:34 ` [virtio-dev] " Michael S. Tsirkin
2018-04-19 11:14 ` Tiwei Bie
2018-04-19 12:43 ` [virtio-dev] " Liang, Cunming
2018-04-19 13:02 ` Paolo Bonzini
2018-04-19 15:19 ` Michael S. Tsirkin
2018-04-19 15:51 ` Paolo Bonzini
2018-04-19 15:59 ` Michael S. Tsirkin
2018-04-19 16:07 ` Paolo Bonzini
2018-04-19 16:48 ` Michael S. Tsirkin
2018-04-19 16:24 ` Liang, Cunming
2018-04-19 16:55 ` Michael S. Tsirkin
2018-04-20 3:01 ` Liang, Cunming
2018-04-19 15:42 ` [virtio-dev] " Michael S. Tsirkin
2018-04-19 15:52 ` Paolo Bonzini
2018-04-19 16:34 ` Michael S. Tsirkin [this message]
2018-04-19 16:52 ` [virtio-dev] " Liang, Cunming
2018-04-19 16:59 ` Paolo Bonzini
2018-04-19 17:27 ` Michael S. Tsirkin
2018-04-19 17:35 ` Paolo Bonzini
2018-04-19 17:39 ` Michael S. Tsirkin
2018-04-19 17:00 ` [virtio-dev] " Michael S. Tsirkin
2018-04-19 23:05 ` [virtio-dev] " Liang, Cunming
2018-04-19 16:27 ` Liang, Cunming
2018-05-02 10:32 ` [virtio-dev] " Tiwei Bie
2018-05-16 1:41 ` [virtio-dev] Re: [PATCH v3 0/6] Extend vhost-user to " Michael S. Tsirkin
2018-05-16 1:56 ` Tiwei Bie
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