kvm-kmod broken with user-return-notifiers

kvm-kmod broken with user-return-notifiers

[Zachary Amsden]

With current upstream changes, VMX operation now relies on have the 
user-notifiers infrastructure.  This makes kvm-kmod use on older kernels 
untenable.

I looked a bit at fixing the underlying problem by simulating the 
user-return callback when we context switch, but it is uglier than I 
would like.

Is anyone currently working on a fix?  This is blocking my development 
work, so if there is no action it looks like I will have to fix it myself.

Thanks,

Zach

Re: kvm-kmod broken with user-return-notifiers

[Jan Kiszka]

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Zachary Amsden wrote:
> With current upstream changes, VMX operation now relies on have the
> user-notifiers infrastructure.  This makes kvm-kmod use on older kernels
> untenable.
> 
> I looked a bit at fixing the underlying problem by simulating the
> user-return callback when we context switch, but it is uglier than I
> would like.
> 
> Is anyone currently working on a fix?  This is blocking my development
> work, so if there is no action it looks like I will have to fix it myself.

You are welcome to test kvm-kmod next and also give feedback on the
approach I applied.

Jan

PS: Just like Avi and Marcelo are posting their work-in-progress to the
next branches of kvm.git and qemu-kvm.git, I will do the same with
kvm-kmod. I'm just still struggling with the sometimes terrible update
latency of korg's public git.


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