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Re: [Qemu-devel] Atomicity of i386 guest atomic instructions
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From: |
Jamie Lokier |
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Subject: |
Re: [Qemu-devel] Atomicity of i386 guest atomic instructions |
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Date: |
Sat, 24 Apr 2010 03:49:02 +0100 |
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User-agent: |
Mutt/1.5.13 (2006-08-11) |
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.
> You can as always check things with the -d parameter.
-- Jamie