2:26 a.m.
Hi,
Given a virDomainPtr variable, how can we know that it is a QEMU or
KVM machine? Is there any API for that?
Many thanks,
Jun
4:37 a.m.
On Fri, Sep 12, 2008 at 04:26:28PM +0900, Jun Koi wrote:
Given a virDomainPtr variable, how can we know that it is a QEMU or
KVM machine? Is there any API for that?
Yes - use virDomainGetXMLDesc[1] to get the XML description of the
domain, then parse out the <domain type='...'> field[2] which will be
either 'qemu' or 'kvm'. This is a pain if you're using a language
which doesn't support XML parsing, but you can usually find a library
to help you, eg. in C use libxml2.
Now there's an additional question: is KVM using hardware acceleration
or is it falling back to software emulation (ie. because the hardware
doesn't support hardware virtualization)? IIRC you can answer this by
looking at the capabilities XML[3], but I think you'll need to do a
bit of experimentation and look at the source code.
Rich.
[1] http://libvirt.org/html/libvirt-libvirt.html#virDomainGetXMLDesc
[2] http://libvirt.org/formatdomain.html#elementsMetadata
[3] http://libvirt.org/html/libvirt-libvirt.html#virConnectGetCapabilities
--
Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones
virt-p2v converts physical machines to virtual machines. Boot with a
live CD or over the network (PXE) and turn machines into Xen guests.
http://et.redhat.com/~rjones/virt-p2v
7:50 a.m.
On Fri, Sep 12, 2008 at 6:37 PM, Richard W.M. Jones <rjones(a)redhat.com> wrote:
On Fri, Sep 12, 2008 at 04:26:28PM +0900, Jun Koi wrote:
> Given a virDomainPtr variable, how can we know that it is a QEMU or
> KVM machine? Is there any API for that?
Yes - use virDomainGetXMLDesc[1] to get the XML description of the
domain, then parse out the <domain type='...'> field[2] which will be
either 'qemu' or 'kvm'. This is a pain if you're using a language
which doesn't support XML parsing, but you can usually find a library
to help you, eg. in C use libxml2.
Now there's an additional question: is KVM using hardware acceleration
or is it falling back to software emulation (ie. because the hardware
doesn't support hardware virtualization)? IIRC you can answer this by
looking at the capabilities XML[3], but I think you'll need to do a
bit of experimentation and look at the source code.
That is clear now, thanks!
Yes, I am using C. Is there any code sample on using libxml2 in libvirt code?
Thanks,
Jun
9:23 a.m.
On Fri, Sep 12, 2008 at 09:50:35PM +0900, Jun Koi wrote:
Yes, I am using C. Is there any code sample on using libxml2 in
libvirt code?
Well libxml2 is used extensively within libvirt, so if you look at the
sources to libvirt I'm sure you'll find plenty of examples. You may
also find information here: http://xmlsoft.org/docs.html
Rich.
--
Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones
Read my OCaml programming blog: http://camltastic.blogspot.com/
Fedora now supports 68 OCaml packages (the OPEN alternative to F#)
http://cocan.org/getting_started_with_ocaml_on_red_hat_and_fedora
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