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Re: [Qemu-devel] PCI CAS implementation in qemu
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From: |
Paolo Bonzini |
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Subject: |
Re: [Qemu-devel] PCI CAS implementation in qemu |
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Date: |
Tue, 20 Nov 2012 17:48:18 +0100 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:16.0) Gecko/20121016 Thunderbird/16.0.1 |
Il 20/11/2012 17:32, Francois WELLENREITER ha scritto:
>
> I order to develop a qemu module, I aim to use the PCI CAS (compare
> and swap) function to guarantee an atomic access somewhere in the
> guest memory (in a multi-core emulation case).
>
> Nevertheless, I did not find any routine in qemu implementing this
> function.
>
> Could anyone on this list tell me if this is implemented and if that's
> not the case, if this would be hard to get implemented ?
(I know nothing about PCI CAS).
Can you just use a compare-and-swap in the QEMU device model (via
__sync_val_compare_and_swap for example)?
Paolo