linux-kernel - Re: [PATCH 0/5] ia64 ski emulator patches

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Message-ID: <alpine.LRH.2.02.1401240937020.28468@file01.intranet.prod.int.rdu2.redhat.com>
Date:	Fri, 24 Jan 2014 09:40:29 -0500 (EST)
From:	Mikulas Patocka <mpatocka@...hat.com>
To:	Mikael Pettersson <mikpelinux@...il.com>
cc:	Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>,
	linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] ia64 ski emulator patches



On Fri, 24 Jan 2014, Mikael Pettersson wrote:

> Mikulas Patocka writes:
>  > Hi
>  > 
>  > Here I'm sending some ia64 patches to make it work in the ski emulator. 
>  > This has been broken for a long time.
> 
> Thanks.  I've recently started running 3.x kernels on ia64 via ski,
> but I'm getting random kernel crashes with 3.13.  I'll give your
> patches a try shortly.

I also had some random page-table corruption when running recent kernels 
in ski. The problems occured when upgrading the whole Debian distribution. 
Kernel 2.6.8 was solid, new kernels caused problems, I don't know why.

> I've written a few patches to improve other aspects of running the
> kernel on ski:
> - ski patch to use tun/tap networking (no need to run ski as root)
> - ski patch to implement a fixed-frequency ITC (the ITC is currently
>   highly variable, completely breaking basic timekeeping)
> - kernel patch to turn PAL_HALT_LIGHT into a new SSC_HALT_LIGHT,
>   and a corresponing ski patch to pause() on SSC_HALT_LIGHT; this
>   together with the fixed-frequency ITC patch allows ski to idle
>   with very low host CPU overhead when the guest kernel idles
> - kernel patch to bump the RAM size from 130MB to 2GB
> 
> I'd be happy to share these patches if there's interest in them.
> 
> /Mikael

I would be interested in them. I also patched that timekeeping issue in 
ski.

Mikulas
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