Re: [Xen-devel] Oldest supported Xen version in upstream QEMU (Was: Re: [Minios-devel] [PATCH v2 0/15+5+5] Begin to disentangle libxenctrl and provide some stable libraries)

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Tue, 2015-09-22 at 22:31 +0100, Stefano Stabellini wrote: 
> The oldest Xen version I build-test for every pull request is Xen 4.0.0,
> I think it is very reasonable to remove anything older than that.
> I am OK with removing Xen 4.0.0 too, but I would like a warning to be
> sent ahead of time to qemu-devel to see if anybody complains.

There is not much point in removing <=3.4 support and keeping 4.0, since
4.0.0 was the last one which used a plain int as a handle, anything older
than 4.0.0 is trivial if 4.0.0 is supported.

One approach I am considering in order to keep 4.0.0 support and earlier
was to turn the "int fd" for <=4.0 into a pointer by having the open
wrapper do malloc(sizeof int) and the using wrappers do xc_foo(*handle).

This way all the different variants take pointers and we have less hoops to
jump through to typedef everything in the correct way for each variant.

If you would rather avoid doing that then I think dropping 4.0.0 support
would be the way to go and I'll send a mail to qemu-devel.

Ian.

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