Message-ID: <50656E8C.6070206@citrix.com>
Date: Fri, 28 Sep 2012 10:31:56 +0100
From: Roger Pau Monne <roger.pau@citrix.com>
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To: Leonardo <rnalrd@gmail.com>
CC: alpine-devel <alpine-devel@lists.alpinelinux.org>
Subject: Re: [alpine-devel] Xen: first experiments
References: <1348823298.21090.14.camel@df1844j>
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Leonardo wrote:

Hello!

Thanks for trying Xen with Alpine!

> Hi,
> 
> I've just started to play with alpine-xen-2.4.5-x86_64 iso + libvirt,
> and I've hit the first issues.
> 
> So far I've followed http://wiki.alpinelinux.org/wiki/Xen_LiveCD, setup
> my local storage, installed and started libvirt.

So I assume you are running it from RAM? If you are interested in this
kind of setup, I would recommend that you create a new ISO/USB with the
dom0_mem command line option [1], something like dom0_mem=512M or maybe
dom0_mem=1024M, since you seem to have quite a lot of memory. This will
prevent errors from the ballon driver, which as far as I know can be a
little slow and I'm not sure if it plays well with ramfs.

Could you also paste the output from `free -m` and `df -h`?

Anyway, I would recommend making sure that everything works with xl, and
then try to use libvirt (I've never used it, so I'm not sure of how well
it works).

> When creating a new domain via libvirt, it reports this error:
> 
> xc: detail: Failed allocation for dom 2: 2048 extents of order 0
> xc: error: Could not allocate memory for HVM guest. (16 = Device or
> resource busy): Internal error
> 
> Googling around I've found this:
> 
> "Sufficient memory was not reserved for fully virtualized guests when
> creating new guests. Memory listed as available by the xm info command
> could not be fully allocated to the guest. When attempting create a
> fully virtualized guest with more than or equal to the maximum available
> memory value, the following error message would appear: 
> Error: (1, 'Internal error', 'Could not allocate memory for HVM guest.\n (16 = Device or resource busy)')
> This issue has been resolved by improving the memory balloon driver to
> correctly allocate memory for fully virtualized guests and fully
> virtualized guests using the Intel VT-d extensions for PCI passthrough.
> (BZ#512041)"
> 
> (from http://www.centos.org/docs/5/html/5.5/Technical_Notes/xen.html
> )
> 
> This is what "xl info" reports:
> 
> kvbn1:~# xl info
> host                   : kvbn1
> release                : 3.3.8-grsec
> version                : #4-Alpine SMP Tue Jul 17 13:08:00 UTC 2012
> machine                : x86_64
> nr_cpus                : 8
> nr_nodes               : 2
> cores_per_socket       : 4
> threads_per_core       : 1
> cpu_mhz                : 2128
> hw_caps                :
> bfebfbff:28100800:00000000:00003b40:009ce3bd:00000000:00000001:00000000
> virt_caps              : hvm hvm_directio
> total_memory           : 8179
> free_memory            : 909
> free_cpus              : 0
> xen_major              : 4
> xen_minor              : 1
> xen_extra              : .2
> xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
> hvm-3.0-x86_32p hvm-3.0-x86_64 
> xen_scheduler          : credit
> xen_pagesize           : 4096
> platform_params        : virt_start=0xffff800000000000
> xen_changeset          : unavailable
> xen_commandline        : 
> cc_compiler            : gcc version 4.6.3 (Alpine 4.6.3-r0) 
> cc_compile_by          : buildozer
> cc_compile_domain      : alpinelinux.org
> cc_compile_date        : Fri Jun 22 14:59:04 UTC 2012
> xend_config_format     : 4
> 
> 
> I'd like also to try creating a domain without libvirt, and I tried
> following this http://wiki.xen.org/wiki/Xen_Beginners_Guide. However I
> cannot find on Alpine a xen-tools package to run "xen-create-image", for
> creating a config file to feed to "xl" in order to create a domain.

xen-create-image is a Debian tool, which is not present in Alpine. If
you wish, you can try creating a Alpine Linux DomU [2] or a Debian DomU
with NetInstall [3].

> I'm pretty new to Xen, so if anyone can give me a suggestion it will be
> very much appreciated.
> 
> Thank you
> 
> - leonardo

[1] http://xenbits.xen.org/docs/unstable/misc/xen-command-line.html
[2] http://wiki.alpinelinux.org/wiki/Create_Alpine_Linux_PV_DomU
[3] http://wiki.gbweb.net/tiki-index.php?page=Installing+a+new+Xen+DomU



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