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Re: [Qemu-devel] Atomicity of i386 guest atomic instructions
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From: |
Paul Brook |
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Subject: |
Re: [Qemu-devel] Atomicity of i386 guest atomic instructions |
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Date: |
Wed, 28 Apr 2010 23:27:34 +0100 |
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User-agent: |
KMail/1.12.4 (Linux/2.6.33-2-amd64; KDE/4.3.4; x86_64; ; ) |
> Alexander Graf wrote:
> > They should be atomic. TCG SMP swaps between different vCPUs only
> > after translation blocks are done. In fact, the only way I'm aware
> > of to stop the execution of a TB mid-way is a page fault.
>
> A page fault would interrupt it if the atomic is implemented as
> a read followed by a write, and the write faults.
Yes, but in that case the whole instruction should be abandoned.
Paul