[Qemu-devel] Help multi thread support.

[Qemu-devel] Help multi thread support.

[Nat Gurumoorthy]

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Hi,
	I am trying to add support for Ubicom 32 bit processors in QEMU.
These cpus have 10 - 12 hardware threads. The current versions have no
mmu. The threads do run independent of each other. How do I expose such
capabilities to QEMU. There is a flag "-cpu" which seems to allow
specification of multiple cores. Would I be using that? I still have to
figure out how to deal with cases where registers writes by one thread
affect the execution of another hardware thread.

Regards
Nat


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Re: [Qemu-devel] Help multi thread support.

[malc]

On Tue, 6 Oct 2009, Nat Gurumoorthy wrote:

> Hi,
> 	I am trying to add support for Ubicom 32 bit processors in QEMU.
> These cpus have 10 - 12 hardware threads. The current versions have no
> mmu. The threads do run independent of each other. How do I expose such
> capabilities to QEMU. There is a flag "-cpu" which seems to allow
> specification of multiple cores. Would I be using that? I still have to
> figure out how to deal with cases where registers writes by one thread
> affect the execution of another hardware thread.

IP3K i'd guess? There are multiple challenges with Ubicom's CPUs, one
being deterministic schedulling which might imply every TB being only
one instruction big, anyways support for this beast is very interesting.

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