Re: [Qemu-devel] Call for testing QEMU aarch64-linux-user emulation

[Michael Matz]

Hi,

On Tue, 25 Feb 2014, Andreas Färber wrote:

> >> There are some pretty large differences between these trees with 
> >> respect to signal syscalls - is that the likely culprit?
> > 
> > Quite likely. We explicitly concentrated on the arch64 specific 
> > instruction emulation leaving more generic patches to flow in from 
> > SUSE as they matured.
> > 
> > I guess it's time to go through the remaining patches and see what's 
> > up-streamable.
> > 
> > Alex/Michael,
> > 
> > Are any of these patches in flight now?
> 
> I don't think so, Alex seems to hate cleaning that stuff up... :P
> 
> Compare https://github.com/openSUSE/qemu/commits/opensuse-1.7 for our
> general queue. We have patches adding locking to TCG, and there's a hack
> pinning the CPU somewhere.

The locking and pinning is all wrong (resp. overbroad).  The aarch64-1.6 
branch contains better implementations for that and some actual fixes for 
aarch64' userspace.

Somehow I don't find the time to go through our patches in linux-user and 
submit them.  The biggest road-block is that signal vs syscall handling is 
fundamentally broken in linux-user and it's unfixable without 
assembler implementations of the syscall caller.  That is also still 
broken on the suse branch where I tried various ways to fix that until 
coming to that conclusion.


Ciao,
Michael.