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Re: [libvirt] [PATCH v0] qemu: Add sandbox support.



On 09/07/12 05:25, Daniel Veillard wrote:
> 
>   The problem is that libvirt and qemu releases are a priori not
> tied, doing what you suggest would mean to try to guess the actual
> qemu version used by the guest and then switch on or off, which would
> somehow be at odd with the overall driver configuration.
>   This also raises the point of the semantic of -sandbox, the code
> assumes that if it is not present then sandboxing is off, and if
> it is present sandboxing is on, now what you say seems to imply that
> sandboxing is on in 1.3 if not present. If right then we need to instead
> do something like -sandbox=off to make sure we propagate the setting
> assuming the qemu.conf explicitely states sandbox=0
> 
>   So we are I think in a tristate configuration:
>    - sandbox=0 in qemu.conf
>      and we need to force it off if supported
>    - sandbox=1 in qemu.conf
>      and we need to force it on if supported
>    - commented out in qemu.conf
>      fallback to the qemu for that guest default
> 
> Apparently currently -sandbox takes no arguments, any chance to
> suport for -sandbox=off before 1.3 ? Because otherwise the global
> settings of libvirt qemu driver will conflict with qemu default setting.
> 
> Daniel
> 
-sandbox does require an argument, either on or off, so that tri-state
configuration is doable at the moment.

I don't think having it on by default is a good idea at this time - I
had to add a few syscalls to the whitelist to get it working for me
before posting the patch, but somehow I managed to break it since.

I'll look into those tests/qemuhelp*.

Ján


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