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

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

Matthias wrote on 2014-06-16:
> According to Jans suggestion, I did a second build with xen up to the 
> changeset he suggested and attached another round of logs.
> 
> 
> Also, to answer Yangs questions, the devices 00:12.0 and 00:13.0 are 
> regular noboard USB controller from the mainboard:
> 
> 00:12.0 USB controller: Advanced Micro Devices, Inc. [AMD/ATI]
> SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
> 00:12.2 USB controller: Advanced Micro Devices, Inc. [AMD/ATI]
> SB7x0/SB8x0/SB9x0 USB EHCI Controller
> 00:13.0 USB controller: Advanced Micro Devices, Inc. [AMD/ATI]
> SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
> 00:13.2 USB controller: Advanced Micro Devices, Inc. [AMD/ATI]
> SB7x0/SB8x0/SB9x0 USB EHCI Controller
> 
> 
> But I did do a second run without them passed through the domU and 
> added the log (xldmesg_secondrun.log). Since I'm seeing IO_PAGE_FAULTs 
> there
> (05:00.0 is the vga i'm passing), I would assume that basically any 
> device I pass through causes these page faults and it has nothing to 
> do with specific faulty devices.

Actually, the problem you saw is the patch (git: 077fc1c04d) tries to fix. What 
makes it really odd is that you didn't see it without fixing, but reproduced it 
with fixing. I am wondering how you bisect it? Is everything working with last 
commit(git:0e251a837)?
Also, the original problem I am trying to fix only related to EPT and VT-d page 
table sharing. So have you tried to not share them?

The attached patch is same to revert commit 077fc1c04d. Can you try it to see 
whether it helps? BTW, I hope you can use commit 077fc1c04d to try since I am 
seeing some other patches may also trigger the issue.

I am working on a debug patch now. Since I don't have the environment to 
reproduce it, it will need your help to try it to provide some logs.

Best regards,
Yang

Attachment: testing.patch
Description: testing.patch

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