On 05/14/2013 02:44 PM, Osier Yang wrote:
> QEMU introduced "discard" option for drive since commit a9384aff53,
>
> <...>
> @var{discard} is one of "ignore" (or "off") or "unmap" (or "on") and
> controls whether @dfn{discard} (also known as @dfn{trim} or @dfn{unmap})
> requests are ignored or passed to the filesystem. Some machine types
> may not support discard requests.
> </...>
>
> This patch exposes the support in libvirt.
>
> QEMU supported "discard" for "-drive" since v1.5.0-rc0:
>
> % git tag --contains a9384aff53
> contains
> v1.5.0-rc0
> v1.5.0-rc1
>
> So this only detects the capability bit using virQEMUCapsProbeQMPCommandLine.
>
ACK,
Martin
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