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Re: [PATCH] 9p/xen: fix init sequence
- To: Dominique Martinet <asmadeus@xxxxxxxxxxxxx>, Alexander Merritt <alexander@xxxxxxxxx>
- From: Juergen Gross <jgross@xxxxxxxx>
- Date: Thu, 21 Nov 2024 13:27:52 +0100
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- Cc: v9fs@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, Eric Van Hensbergen <ericvh@xxxxxxxxxx>, Latchesar Ionkov <lucho@xxxxxxxxxx>, Christian Schoenebeck <linux_oss@xxxxxxxxxxxxx>, Simon Horman <horms@xxxxxxxxxx>, Alex Zenla <alex@xxxxxxxxx>, Ariadne Conill <ariadne@ariadne.space>
- Delivery-date: Thu, 21 Nov 2024 12:28:00 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 21.11.24 13:23, Dominique Martinet wrote:
Alexander Merritt wrote on Tue, Nov 19, 2024 at 09:16:33PM +0000:
From: Alex Zenla <alex@xxxxxxxxx>
Large amount of mount hangs observed during hotplugging of 9pfs devices. The
9pfs Xen driver attempts to initialize itself more than once, causing the
frontend and backend to disagree: the backend listens on a channel that the
frontend does not send on, resulting in stalled processing.
Only allow initialization of 9p frontend once.
I'm not familiar with the xen bringup so I don't understand how the
patch guarantees this -- otherend_changed calls are guaranted to be
seralized for a given frontend?
Yes. They are all executed by a single kernel thread.
Juergen
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