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Re: [Qemu-devel] memory ordering emulation in qemu
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From: |
Peter Maydell |
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Subject: |
Re: [Qemu-devel] memory ordering emulation in qemu |
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Date: |
Thu, 29 Mar 2012 21:54:23 +0100 |
On 29 March 2012 21:49, Xin Tong <address@hidden> wrote:
> I am wondering what the solution in qemu is if the guest architecture
> has a stronger memory ordering requirement than the host archiecture ?
> memory fences ?
In system mode all guest CPUs run in a single host thread so
there aren't any ordering issues between host CPUs. In linux-user
mode we just hope it isn't actually a problem (threading support
is not exactly particularly reliable anyway).
-- PMM