From: Thomas Monjalon <thomas.monjalon@6wind.com>
To: Huawei Xie <huawei.xie@intel.com>
Cc: dev@dpdk.org, mst@redhat.com
Subject: Re: [PATCH v2] vhost: flush used->idx update before reading avail->flags
Date: Wed, 13 May 2015 12:46:30 +0200 [thread overview]
Message-ID: <1907109.z7RyHoHxuq@xps13> (raw)
In-Reply-To: <1430305884-9139-1-git-send-email-huawei.xie@intel.com>
2015-04-29 19:11, Huawei Xie:
> update of used->idx and read of avail->flags could be reordered.
> memory fence should be used to ensure the order, otherwise guest could see a stale used->idx value after it toggles the interrupt suppression flag.
> After guest sets the interrupt suppression flag, it will check if there is more buffer to process through used->idx. If it sees a stale value, it will exit the processing while host willn't send interrupt to guest.
>
> Signed-off-by: Huawei Xie <huawei.xie@intel.com>
Applied with following title, thanks
vhost: fix virtio freeze due to missed interrupt
next prev parent reply other threads:[~2015-05-13 10:47 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-22 16:33 [PATCH] vhost: flush used->idx update before reading avail->flags Huawei Xie
[not found] ` <1429720392-25345-1-git-send-email-huawei.xie-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2015-04-23 13:57 ` Luke Gorrie
2015-04-24 1:01 ` Linhaifeng
[not found] ` <553995DB.4000801-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
2015-04-24 2:40 ` Xie, Huawei
2015-04-24 7:27 ` Luke Gorrie
2015-06-09 7:04 ` Linhaifeng
2015-06-09 7:45 ` Luke Gorrie
2015-06-09 8:46 ` Michael S. Tsirkin
2015-06-09 13:34 ` Xie, Huawei
2015-06-10 2:36 ` Linhaifeng
2015-06-10 8:30 ` Luke Gorrie
2015-06-11 0:50 ` Linhaifeng
2015-04-29 11:11 ` [PATCH v2] " Huawei Xie
2015-05-13 10:46 ` Thomas Monjalon [this message]
2015-05-15 13:43 ` Nikita Kalyazin
2015-05-15 15:23 ` Michael S. Tsirkin
2015-05-18 6:18 ` Nikita Kalyazin
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