Re: [libvirt-users] Development of application on using the libvirt API(s)
On 03/19/2015 11:44 AM, Parvathi wrote:
Hi,
I am developing an application that would essentially control/run VMs on a
X86_64 host machine. The existing OS is 32 bit based so the application
needs to be 32bit too. KVM/QEMU are 64 bit so that guests could be either
be 32 or 64 bit. Does using libvirt as 32bit library on a 64bit host
(capable of hosting 32 and 64 bit guests) pose any problems? Will it even
work?
Yes, a 32-bit libvirt.so client on one host can correctly control a
64-bit libvirtd on another host. There are some APIs that (for
historical reasons) pass a 'long'; these APIs properly flag overflow if
a value cannot be converted from 64-bit on the host down to the limited
32-bit on the client. But as long as the API doesn't trigger that large
of a value, you are fine. And for everything specified as 'int' or
'long long', it all works just fine.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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