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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: Wed, 22 Jun 2016 13:45:10 +0800
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.1.0

Hi Alex,

In vfio I have some questions.
1. How can I disable the access by mmap?
    We can disable all access to vfio fd by returning a EAGAIN error
    if user try to access it during the reset period until the host
    reset finished.
    But about the bar region which is maped by vfio_pci_mmap.
    How can I disable it in vfio driver?
    Even there is a way to do it,
    how about the complexity to recovery the mmap?

That's exactly the "sticky point" I refer to above, you'd need to
solve that problem.  MST would probably still argue that we don't need
to disable all those interfaces, a userspace driver can already do
things like disable mmio space and then attempt to read from the mmio
space of the device.
You said we should not depend on user to protect the device
 be accessed during the reset period.

So maybe the problem can be simplified to
non-device specific interfaces, like config space access plus ioctls.
I don't understand what's your mean.


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