Date: Fri, 26 Feb 2016 14:08:47 +0100 From: =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= <roger.pau@citrix.com> To: =?UTF-8?Q?Gustau_P=c3=a9rez?= <gustau.perez@gmail.com>, "freebsd-xen@freebsd.org >> FreeBSD XEN" <freebsd-xen@freebsd.org> Subject: Re: Porting the block-iscsi hotplug script Message-ID: <56D04E5F.8070901@citrix.com> In-Reply-To: <56D03D95.9090509@gmail.com> References: <553DEB97.5000300@entel.upc.edu> <5540A053.4080409@entel.upc.edu> <5540F3FC.80606@citrix.com> <5541FC8A.8080009@citrix.com> <5542365D.10403@entel.upc.edu> <55423ECD.6000404@citrix.com> <5556F21D.2050005@entel.upc.edu> <555EEFBA.5080902@citrix.com> <555EF542.3090002@citrix.com> <555F9B3F.1000600@entel.upc.edu> <55602512.1090702@citrix.com> <56C6FA2F.8040900@gmail.com> <56CAC8CB.8030107@gmail.com> <56CADEDA.4050007@citrix.com> <56CB0057.1060509@gmail.com> <56CB041E.1020009@citrix.com> <56CB2D90.5080809@gmail.com> <56CB34BA.6060809@citrix.com> <56CC24BD.6050609@gmail.com> <56CC32E5.5010101@citrix.com> <56CC7637.3080408@gmail.com> <56CF5668.6090605@citrix.com> <56D0091F.80408@gmail.com> <56D02863.7040100@citrix.com> <56D03D95.9090509@gmail.com>
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El 26/2/16 a les 12:57, Gustau Pérez ha escrit: > > > El 26/02/16 a les 11:26, Roger Pau Monné ha escrit: >> Hello, >> >> I've rebased everything on top of Xen 4.5, so it can be applied to the >> xen-tools and xen-kernel packages without issues, I've uploaded all the >> patches to: >> >> https://people.freebsd.org/~royger/hotplug/ > > So in my case, I'd need those patches and the patches at [1] (or the > machine would panic at the ata stage during the boot), wouldn't I? I > don't know if I'll be able to deal with that today or this weekend, if > not monday I'll test and let you know. Not any more, I've just updated the Xen ports and added the patches in [1]: https://svnweb.freebsd.org/ports?view=revision&revision=409604 >> As you can see, each folder contains the patches that should be applied >> to each component. With this I've been able to use the simple block >> hotplug script that's included in the series. >> >> There's a limitation with block hotplug scripts, that is not specific to >> FreeBSD (the same applies to Linux for example). You cannot use block >> hotplug scripts with HVM guests. This is because HVM guests require a >> QEMU instance, and in order to provide a virtual disk to QEMU it must be >> a file or block device present on the system. Then when using block >> hotplug scripts the block device can only be made available using what >> we call a local attach (attaching the virtual disk to Dom0), and libxl >> doesn't do that yet. Of course patches are very welcome to remove this >> limitation ;). The code to perform local attaching to Dom0 is already in >> libxl, it's just not used for this case. >> >> Roger. > > In fact this is the scenario I'm most interested in :) I'll first > take a took a the current situation with PV guests and build that > hotplug script and then I think I'd like to deal with the support for > HVM guests. It shouldn't be too hard, as I said the code is already there. The only issue I foresee is that you will have to find somewhere to store the information about the disk you have locally-attached, so you can remove it when the guest is destroyed. Roger.
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