Re: [Xen-users] Windows 7 PCI hotplugging

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

On Thu, Oct 15, 2015 at 10:29 PM, Charlie Mei <cmei@xxxxxxxxxxxxxx> wrote:
> Hi,
>
> What is the current state for PCI hotplugging in Windows 7 HVM? In
> particular, I am wondering if anyone else attempted hotplugging
> graphics cards using PCI passthrough in Xen. I can successfully boot
> Windows 7 HVM on top of Xen, and have PCI passthrough working for
> graphics cards. `pci-detach` of a graphics card not acting as a
> frame-buffer works fine, but re-attaching that card crashes not just
> the DomU Windows 7, but also Xen Dom0.

Crashing dom0 is certainly a bug.  If there's any chance you could get
a serial log of the dom0 crash, I'm sure we'd appreciate it.

In your description you only talk about re-attaching a PCI device, but
you don't say what happens if you hot-plug it without having first
attached it to the guest: that is, if you boot the host, boot the
guest, then do "xl pci-attach".

It's significant because if it works before the card has ever been
attached, but not after, then there may be some issue with the FLR
(function-level reset), which is supposed to set the card back into
the state it started in at boot

 -George

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