Re: [Xen-devel] Please revert / review 077fc1c04d70ef1748ac2daa6622b3320a1a004c

["Zhang, Yang Z" <yang.z.zhang@xxxxxxxxx>]

Matthias wrote on 2014-06-12:
> Yes, I'm seeing the
> (XEN) testing: enable log dirty mode
> 
> in xl dmesg.

I cannot understand why log dirty is used in AMD gfx passthrough.

> 
> 
> Also, here are logs and additional information from a start with a xen 
> build up to the 077fc1c changeset. DomU Name is WORK.
> 
> I haven't attached a xl dmesg log because it was only filled with this:

It's better to attach the whole log since there are some debug messages which 
are useful. If the log buffer isn't enough, please add conring_size=xxM to Xen 
cmd line.

> 
> domain = 0, device id = 0x98, fault address = 0xffffffc0, flags = 0
> (XEN) AMD-Vi: IO_PAGE_FAULT: domain = 0, device id = 0x90, fault 
> address = 0xffffffc0, flags = 0
> (XEN) AMD-Vi: IO_PAGE_FAULT: domain = 0, device id = 0x98, fault 
> address = 0xffffffc0, flags = 0
> (XEN) AMD-Vi: IO_PAGE_FAULT: domain = 0, device id = 0x90, fault 
> address = 0xffffffc0, flags = 0
> (XEN) AMD-Vi: IO_PAGE_FAULT: domain = 0, device id = 0x98, fault 
> address = 0xffffffc0, flags = 0
> (XEN) AMD-Vi: IO_PAGE_FAULT: domain = 0, device id = 0x90, fault 
> address = 0xffffffc0, flags = 0
> (XEN) AMD-Vi: IO_PAGE_FAULT: domain = 0, device id = 0x98, fault 
> address = 0xffffffc0, flags = 0
> (XEN) AMD-Vi: IO_PAGE_FAULT: domain = 0, device id = 0x90, fault 
> address = 0xffffffc0, flags = 0

This is really strange. The fault shows it is caused by dom0's activity. But 
the device have assigned to the guest. Are you sure the devices(00:13.0 and 
00:12.0) are hidden and dom0 is not using it? BTW, what are the devices of 
00:12.0 and 00:13.0?


Best regards,
Yang


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