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Re: [Qemu-discuss] EHCI usb passthrough not working with FreeBSD 8/9/10

From: Programmingkid
Subject: Re: [Qemu-discuss] EHCI usb passthrough not working with FreeBSD 8/9/10 guest
Date: Sun, 17 Apr 2016 10:24:57 -0400

On Apr 17, 2016, at 6:47 AM, Jon Doe wrote:

> On Fri, Apr 15, 2016 at 4:39 PM, Programmingkid
> <address@hidden> wrote:
>> On Apr 15, 2016, at 9:39 AM, Jon Doe wrote:
>>> Fedora 21 was on qemu 2.1.3 and Fedora 23 is on 2.4.1. I'm busy trying
>>> to figure out how to use mock to build a previous version of qemu for
>>> Fedora 23 but it's all a bit too complex for my packaging skill level
>>> :-(
>> Top posting is kind of a no-no here.
>> Does your system have git? If it does, then I would suggest using it to 
>> download and install QEMU.
>> git clone git://git.qemu-project.org/qemu.git
>> cd qemu
>> ./configure --target-list=i386-softmmu
>> make
>> If you have gcc and all of QEMU's prerequisites, then you would be able to 
>> do this.
> Ok, found the offending commit:
> 156a2e4dbffa85997636a7a39ef12da6f1b40254 ehci: make idt processing more robust
> This security fix (CVE-2015-8558) is intended to prevent loops, but
> breaks ehci in FreeBSD. Do I report this as a regression on
> qemu-devel?

Yes, you can do that. You can also report it here: 

> The 100% cpu seems to be an unrelated issue. Choosing a machine type
> above pc-i440fx-2.0 ( i.e. 2.1, 2.2, etc) triggers this bug. I haven't
> found the cause yet.

What process on FreeBSD is using the most CPU time?

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