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SubjectRe: [PATCH 0/5] ia64 ski emulator patches
Mikulas Patocka writes:
>
>
> 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.

What I've seen so far seems to indicate that gcc-4.8.2 miscompiles ski,
resulting in kernel oopses, and _possibly_ that gcc-4.7.3 miscompiles
the kernel. Ski compiled by gcc-4.7.3 (on x86_64) running a kernel
compiled by gcc-4.3.6 seems to be a solid combination for me.

> > 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.

My ski patches are in <http://user.it.uu.se/~mikpe/linux/patches/ia64/ski-1.3.2/>
for now. I'll post the kernel patches to linux-ia64 @ vger in a few minutes.

/Mikael


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