Re: [Xen-devel] How to switch VGA passthrough live

[Jean Guyader <jean.guyader@xxxxxxxxxxxxx>]

Windows is really bad at doing vga hotplug, your guest will crash/freez/BSOD.

Windows 7 might do something a bit more sensible but I'm note sure.

Jean

On Fri, Jun 04, 2010 at 05:19:09PM +0100, 于佳耕 wrote:
> Hmm, you are right. I have found that WinXP and Win7 could not handle the VGA 
> remove sci interrupt. Please try to execute "xm pci-detach Domain 
> 00:00:02.0". So I directly invoke acpi_php_writeb to handle VGA remove event.
> 
> 2010/6/4 Stefano Stabellini 
> <stefano.stabellini@xxxxxxxxxxxxx<mailto:stefano.stabellini@xxxxxxxxxxxxx>>
> On Fri, 4 Jun 2010, 于佳耕 wrote:
> >
> > Hi,
> >
> > I want to switch video card live between two HVMs. My simplest idea is that 
> > when the HVM has the permission to access
> > passthrough video card, and another HVM will be paused. If switch from A to 
> > B, execute commands :
> >
> > xm pause A ;
> >
> > xm pci-detach A  00:00:02.0 ;
> >
> > xm pci-attach B 00:00:02.0 ;
> >
> > xm unpause B.
> >
> >
> >
> > I have a try, but failed. The pseudo-code is as below. Can you give me some 
> > ideas? Any suggestions will be thankful.
> >
> 
> pci-detach needs cooperation from the guest, how the guest is supposed
> to handle the acpi interrupt if it is paused?
> 

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