Hi, Dan I and Sunou investivate this issue. virsh setmem commands directry writes xenstore(memory/target) by using xenStoreDomainSetMemory()@xs_internal.c. This data (memory/target) is read by PVdomain balloon driver directly. As you know, xenstore just pass through the data between inter domain. For this reason, virsh setmem must protect at xs_internal.c not on Xen-side Anyway xm mem-set uses setMemoryTarget()@XendDomainInfo.py and write xenstore(memory/target). This path can be protected by XenD fixes. How should we do? Thanks Atsushi SAKAI Atsushi SAKAI <sakaia@jp.fujitsu.com> wrote:
Hi, Dan
O.K.
I will asking Xen-devel with policy forcing patch.
Thanks Atsushi SAKAI
"Daniel P. Berrange" <berrange@redhat.com> wrote:
On Wed, Mar 07, 2007 at 06:43:14AM -0500, Daniel Veillard wrote:
On Tue, Mar 06, 2007 at 02:40:24PM +0900, Masayuki Sunou wrote:
Hi
The minimum value of the memory guarded with virsh setmem is 4096KB(4MB). In general, when host's memory is set to 4MB, the host stops.
Therefore, I propose the patch to which host's minimum value of the memory is guarded by 256MB.
I have run guests in 64MB of memory, so 256 as an arbitrary limit sounds way too high to me. There is some places in libvirt code where 64 is the limit (e.g. xend_parse_sexp_desc() if ((cur_mem > 63) && (cur_mem != max_mem)) ...) so if we set a limit here too that should be homogenized (using a constant in internal.h preferably).
This still feels wrong to me - I'm don't like the idea of libvirt enforcing policy decisions, particularly when they're compiled in. With the current bloated Xen python stack we probably won't go below 64 MB, but we won't always be managing Xen, nor will Xen forever be stuck with a python stack (i hope :-). I'd say that if possible XenD should be fixed to honour dom0_min_memory in all cases, rather than just when ballooning down to start a guest.
Regards, Dan. -- |=- Red Hat, Engineering, Emerging Technologies, Boston. +1 978 392 2496 -=| |=- Perl modules: http://search.cpan.org/~danberr/ -=| |=- Projects: http://freshmeat.net/~danielpb/ -=| |=- GnuPG: 7D3B9505 F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 -=|
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