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Re: [Qemu-devel] [PATCH v8 11/12] vfio: register aer resume notification

From: Zhou Jie
Subject: Re: [Qemu-devel] [PATCH v8 11/12] vfio: register aer resume notification handler for aer resume
Date: Sun, 12 Jun 2016 10:38:33 +0800
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.1.0

Hi, Alex

It seems like we have a number of questions open in the thread with MST
from the previous version, particularly whether we should actually drop
the resume notifier and block the reset in the kernel.  The concern
being that it's not very well specified what we can and cannot do
between the error interrupt and the resume interrupt.  We'd probably
need some other indicate of whether the host has this capability,
perhaps a flag in vfio_device_info.  Appreciate your opinions there.


Have you had a conclusion with MST?

How about the process like following?
1. Detect support for VFIO reset blocking.
   Maybe use vfio_device_info.
2. Immediately notify the VM on error detected.
   If kernel is doing reset, then block in ioctl.

   Can I ignore the resume notifier?
   Shall ioctl block until after receiving resume notification?

Zhou Jie

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