Re: [9front] qemu clock/timer issue

[Douglas Guptill <dguptill@accesswave.ca>]

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Hello moody:

On Tue, Apr 16, 2024 at 08:32:42AM -0500, Jacob Moody wrote:

> It is understood that this bug only happens with intel kvm virtual machines.
>  From all that has been tested it was currently understood to affect newer intel machines.
> It seems however that your machine is a bit older(10+ years) and still triggering this.
> I've certainly run 9front in kvm on intel machines before so it is likely either
> something that changed with us or something that has changed with QEMU. My money
> is on some QEMU change.

Ahhh.. That is a big help.  

> If you do not feel comfortable debugging

I'm a programmer. :)

I can look at the code, build and insert write statements, in qemu and
the kvm module of linux.  Cannot yet do anything like that with
9front.

> but would still be interested in helping

For sure.

> perhaps you can help bisect 9front and qemu (one side at a time) to see if you can
> narrow down what has changed to get more information to fix these things.
> I would start with the nightly iso just to double check,

Assuming that you mean a nightly iso of 9front, I just did that with
9front-10501.amd64.iso.gz.  No noticable change; but then I don't yet
understand 9front.  I stopped it quickly.  Attached is a jpg of what I
saw.

> then move back through the releases going back.

Sorry, I don't understand.  Releases of...qemu?  9front?

There is a newer qemu (9.0.0-rc3) out; I will make a build of that,
and then start looking at its code, and the kvm module code, to see if
I can find, and maybe understand, the offending code.

Thank you for the reply,
Douglas.
-- 
Bold character derived from stubborn patience and adversity.
==
Douglas Guptill, B.Sc., CCP, M.Comp.Sci., THB

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