[Libvir] support for hvm guests
by Jim Fehlig
Daniel,
FYI, I'm working on a patch to support hvm guests. Attached is the work
thus far. Calling "virsh dumpxml some_hvm_guest" will (almost)
correctly dump xml config info on hvm guests. Needs to handle
"type=ioemu" component of VIF specification. Currently in the XML there
is a type attribute for the interface element that specifies bridge,
route, etc. How would you like to structure the interface element and
its children to account for hvm guests?
Using "virsh create file" where file contains XML config for hvm guests
may be close to working but I haven't tested it yet. There are several
options that need to be added to the XML to support hvm guests. If we
can agree on the structure I can add the functionality.
Regards,
Jim
18 years, 5 months
[Libvir] A 'mock' driver enabling application unit testing
by Daniel P. Berrange
The attached patch adds a new driver which provides a 'mock' hypervisor
connection. The idea behind this is to provide a completely predictable
and isolated hypervisor implementation, which will facilitate creation
of unit tests in applications using libvirt.
The code attached is not a complete implementation, providing support only
for connecting, listing domains, getting a domain by id/uuid/name, getting
domain info, getting node info. Further work will hook up methods for
creating domains, exporting XML & the other various libvirt APIs. The driver
is intended to operate as a black box, closed system - the only interaction
an application will have is via the libVirt entry points. It starts off with
a single domain present, and fixed node info, and updates domain CPU time
based on elapsed wall clock time. When the domain create API is hooked up
this will let apps create new dummy domains within the context of the process.
As I said, I delibrately implemented this driver to only have process local
state. When the process shuts down all state is discarded. This keeps application
usage very simple. Longer term I think it would be useful to have a 2nd, dynamic,
which would allow fault injection, cross-process interaction & more to allow
advanced scripting of a test scenario. I don't have time to create such a driver
myself though, so I stuck with the simplest possible impl which will allow 95%
of application unit testing needs to be satisfied.
To use this driver, simply pass 'TestSimple' as the name parameter to
virConnectOpen / virConnectOpenReadonly instead of NULL. If you are using
'virsh' then my previous patch will let you call 'virsh --connect TestSimple'
I've also tested this with the 'gnome-vm-applet' panel applet.
The only problem I have found is that the 'xend_internal.c' driver will
always return success from its 'xenDaemonOpen' method, regardless of
whether there is actually a Xen Daemon present. So when using the test
driver, every method will first try to ue the XenD driver impl, fail (printing
an error message) and then go onto use the test driver. The xenDaemonOpen
method really needs to be fixed to only succeed when Xen is actually present.
Or perhaps it should only try to run when the 'name' passed to virConnectOpen
is NULL or 'Xen' - ie be a no op if the name is 'TestSimple' / QEMU / any
other driver implementation.
I'm not sure whether we want to commit this to the libvirt codebae just,
since there is a fair bit more work to be done to hook up additional
methods.
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 -=|
18 years, 6 months
[Libvir] Added 'domuuid' to virsh & --connect command lin arg
by Daniel P. Berrange
The attached patch makes two changes to the virsh command:
* Adds a 'domuuid' command to display the printable UUID of a domain
* Adds a '--connect NAME' argument allowing the name of a hypervisor
to be passed through to 'virConnect' / 'virConnectReadOnly'
Although libvirt only has a Xen backend at the moment, I'm working on a
'mock' hypervisor backend to enable unit testing of applications built on
libvirt without requiring the test suite to interface with the real Xen
hypervisor.
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 -=|
18 years, 7 months
[Libvir] Connect up more internal driver methods
by Daniel P. Berrange
The attached patch connects up more of the internal driver methods, as
the final step preparing for a minimally operational test driver.
* src/hash.c, src/internal.h: Switch the uuid parameter in virGetDomain
to be of type 'unsigned char' since its a raw UUID we're passing in,
not a printable one.
* src/libvirt.c: Remove bogus "unsigned char" -> "char" type casts. Hook
up the "domainLookupByID", "domainLookupByUUID", "domainLookupByName"
and "domainGetInfo" driver backend functions.
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 -=|
18 years, 7 months
[Libvir] A few bug fix patches
by Daniel P. Berrange
Attached are two small bug fix patches:
- libvirt-vpath.patch - fix test suite include path for VPATH builds
- libvirt-symbols.patch - add some missing symbols to the libraries
exported symbol table to make the python bindings work again
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 -=|
18 years, 7 months
[Libvir] uuid string format
by Karel Zak
Hello,
I've found that we use in our XML dump:
<uuid>%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x</uuid>
it's strange format of the UUID string representation. Is there any
reason for this format? I think normal (rfc4122) is format:
"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x"
it means with '-'.
Karel
--
Karel Zak <kzak(a)redhat.com>
18 years, 7 months
[Libvir] BUG: virDomainLookupByID fails in libvirt-0.1.0
by Michel Gauthier
Hi,
I tried to execute the info1 C code example on my redhat distribution with
Xen installed.
It fails due to the virDomainLookupByID API wich returns NULL.
The problem seems to be in the internal function xenDaemonListDomains called
after xs_get_domain_path inside the API.
For the domain 0, xs_get_domain_path returns path=/local/domain/0. Then, the
call to xenDaemonListDomains function logs the error message:
"libvir: Xen Daemon error : could not connect to Xen Daemon"
and returns names=NULL.
A bug present in the release 0.0.6 has been fixed for the release 0.1.0. But
this bug seems still present!
Regards.
18 years, 7 months
[Libvir] Re: support for hvm guests
by Jim Fehlig
>>>> Anthony Liguori <aliguori(a)us.ibm.com> 05/03/06 6:47 PM >>>
>
>>>> Currently I can get info on hvm domains but unable to create them.
>>>> The create request is sent to xend but then blocks reading from
xend
>>>> in xend_req(). No problem creating the domain using xm. I have
>>>> looked at the config coming into xend and it is identical between
xm
>>>> and virsh/libvirt. Need to poke around xend and see why there is
no
>>>> response to the virsh/libvirt create request for hvm domains.
>>>>
>>>
>>> Hum, basically to debug this kind of things I spend my time in
>>> /var/log/xend.log especially since it prints what it received at
>>> creation
>>> time, you can at least check the informations coming from libvirt
and
>>> from xm look alike.
>>> Unfortunately I won't be able to help you, first because I'm about
to
>>> take vacations for 3 weeks :-), second because I don't have one of
those
>>> new Intel CPUs, but I am sure others will give an hand if needed.
>>>
>>>
>>
>> Well, I have found the problem but not a fix :-). When posting the
>> create op to xend, the libvirt code currently waits for a response
>> from xend (xend_req() is called after posting in xend_post()). For
>> hvm guests, xend does not respond and libvirt blocks indefinitely on
>> read. If I skip over the call to xend_req() for the create
operation,
>> wait_for_devices() and subsequently unpause() are called and the hvm
>> guest is launched.
>
>What do you mean by Xend does not respond?
I post a request such as:
op=create&config=(vm%20(name%20'j_sles10b9_full')(memory%20512)(vcpus%201)(on_poweroff%20'destroy')(on_reboot%20'destroy')(on_crash%20'destroy')(image%20(hvm%20(kernel%20'/usr/lib/xen/boot/hvmloader')(device_model%20'/usr/lib/xen/bin/qemu-dm')(boot%20c)(sdl%201)(stdvga%201)(vcpus%201)))(device%20(vbd%20(dev%20'ioemu:hda')(uname%20'file:/var/lib/xen/images/j_sles10b9_full/hda')(mode%20'w')))(device%20(vif%20(mac%20'00:16:3e:b2:68:1d')(bridge%20'xenbr0')(script%20'vif-bridge')(type%20'ioemu'))))
to xend from xend_post() in libvirt's xend_internal.c, which then
expects to read a response from xend but it never arrives and blocks the
read in libvirt.
>Can you give me a very concrete test case for this? The exact
>parameters being passed to domain_create() (it should just be an
>S-Expression config).
The sexpr is:
(vm (name 'j_sles10b9_full')(memory 512)(vcpus 1)(on_poweroff
'destroy')(on_reboot 'destroy')(on_crash 'destroy')(image (hvm (kernel
'/usr/lib/xen/boot/hvmloader')(device_model
'/usr/lib/xen/bin/qemu-dm')(boot c)(sdl 1)(stdvga 1)(vcpus 1)))(device
(vbd (dev 'ioemu:hda')(uname
'file:/var/lib/xen/images/j_sles10b9_full/hda')(mode 'w')))(device (vif
(mac '00:16:3e:b2:68:1d')(bridge 'xenbr0')(script 'vif-bridge')(type
'ioemu'))))
The url-encoded request sent from libvirt is also provided above. Below
is the relevent content in xend.log.
Thanks,
Jim
[2006-05-02 10:58:13 xend.XendDomainInfo] DEBUG (XendDomainInfo:180)
XendDomainInfo.create(['vm', ['name', 'j_sles10b9_full'], ['memory',
'512'], ['maxmem', '512'], ['vcpus', '1'], ['on_poweroff', 'destroy'],
['on_reboot', 'destroy'], ['on_crash', 'destroy'], ['image', ['hvm',
['kernel', '/usr/lib/xen/boot/hvmloader'], ['device_model',
'/usr/lib/xen/bin/qemu-dm'], ['boot', 'c'], ['cdrom',
'/tests/iso/SLES-10-i386-Beta9.iso'], ['sdl', '1'], ['stdvga', '1'],
['vcpus', '1']]], ['device', ['vbd', ['dev', 'ioemu:hda'], ['uname',
'file:/var/lib/xen/images/j_sles10b9_full/hda'], ['mode', 'w']]],
['device', ['vif', ['mac', '00:16:3e:b2:68:1d'], ['bridge', 'xenbr0'],
['script', 'vif-bridge'], ['type', 'ioemu']]]])
[2006-05-02 10:58:13 xend.XendDomainInfo] DEBUG (XendDomainInfo:286)
parseConfig: config is ['vm', ['name', 'j_sles10b9_full'], ['memory',
'512'], ['maxmem', '512'], ['vcpus', '1'], ['on_poweroff', 'destroy'],
['on_reboot', 'destroy'], ['on_crash', 'destroy'], ['image', ['hvm',
['kernel', '/usr/lib/xen/boot/hvmloader'], ['device_model',
'/usr/lib/xen/bin/qemu-dm'], ['boot', 'c'], ['cdrom',
'/tests/iso/SLES-10-i386-Beta9.iso'], ['sdl', '1'], ['stdvga', '1'],
['vcpus', '1']]], ['device', ['vbd', ['dev', 'ioemu:hda'], ['uname',
'file:/var/lib/xen/images/j_sles10b9_full/hda'], ['mode', 'w']]],
['device', ['vif', ['mac', '00:16:3e:b2:68:1d'], ['bridge', 'xenbr0'],
['script', 'vif-bridge'], ['type', 'ioemu']]]]
[2006-05-02 10:58:13 xend.XendDomainInfo] DEBUG (XendDomainInfo:382)
parseConfig: result is {'ssidref': None, 'uuid': None, 'on_crash':
'destroy', 'on_reboot': 'destroy', 'localtime': None, 'image': ['hvm',
['kernel', '/usr/lib/xen/boot/hvmloader'], ['device_model',
'/usr/lib/xen/bin/qemu-dm'], ['boot', 'c'], ['cdrom',
'/tests/iso/SLES-10-i386-Beta9.iso'], ['sdl', '1'], ['stdvga', '1'],
['vcpus', '1']], 'on_poweroff': 'destroy', 'cpus': None, 'name':
'j_sles10b9_full', 'backend': [], 'cpu': None, 'vcpus': 1, 'cpu_weight':
None, 'vcpu_avail': None, 'memory': 512, 'device': [('vbd', ['vbd',
['dev', 'ioemu:hda'], ['uname',
'file:/var/lib/xen/images/j_sles10b9_full/hda'], ['mode', 'w']]),
('vif', ['vif', ['mac', '00:16:3e:b2:68:1d'], ['bridge', 'xenbr0'],
['script', 'vif-bridge'], ['type', 'ioemu']])], 'bootloader': None,
'root': None, 'bootentry': None, 'maxmem': 512}
[2006-05-02 10:58:13 xend.XendDomainInfo] DEBUG (XendDomainInfo:1189)
XendDomainInfo.construct: None 0
[2006-05-02 10:58:13 xend.XendDomainInfo] DEBUG (XendDomainInfo:1221)
XendDomainInfo.initDomain: 29 1.0
[2006-05-02 10:58:13 xend] DEBUG (image:266) args: cdrom, val:
/tests/iso/SLES-10-i386-Beta9.iso
[2006-05-02 10:58:13 xend] DEBUG (image:266) args: boot, val: c
[2006-05-02 10:58:13 xend] DEBUG (image:266) args: fda, val: None
[2006-05-02 10:58:13 xend] DEBUG (image:266) args: fdb, val: None
[2006-05-02 10:58:13 xend] DEBUG (image:266) args: nic-ne2000, val: None
[2006-05-02 10:58:13 xend] DEBUG (image:266) args: enable-audio, val:
None
[2006-05-02 10:58:13 xend] DEBUG (image:266) args: localtime, val: None
[2006-05-02 10:58:13 xend] DEBUG (image:266) args: serial, val: None
[2006-05-02 10:58:13 xend] DEBUG (image:266) args: std-vga, val: 1
[2006-05-02 10:58:13 xend] DEBUG (image:266) args: isa, val: None
[2006-05-02 10:58:13 xend] DEBUG (image:266) args: vcpus, val: 1
[2006-05-02 10:58:13 xend] DEBUG (balloon:177) Balloon: free 2267; need
518; done.
[2006-05-02 10:58:13 xend] INFO (image:135) buildDomain os=hvm dom=29
vcpus=1
[2006-05-02 10:58:13 xend] DEBUG (image:224) dom = 29
[2006-05-02 10:58:13 xend] DEBUG (image:225) image =
/usr/lib/xen/boot/hvmloader
[2006-05-02 10:58:13 xend] DEBUG (image:226) store_evtchn = 1
[2006-05-02 10:58:13 xend] DEBUG (image:227) memsize = 512
[2006-05-02 10:58:13 xend] DEBUG (image:228) vcpus = 1
[2006-05-02 10:58:13 xend] DEBUG (image:229) pae = 0
[2006-05-02 10:58:13 xend] DEBUG (image:230) acpi = 0
[2006-05-02 10:58:13 xend] DEBUG (image:231) apic = 0
[2006-05-02 10:58:13 xend] DEBUG (image:409) hvm shutdown watch
registered
[2006-05-02 10:58:13 xend] DEBUG (blkif:24) exception looking up device
number for hda: [Errno 2] No such file or directory: '/dev/hda'
[2006-05-02 10:58:13 xend] DEBUG (DevController:103) DevController:
writing {'state': '1', 'backend-id': '0', 'backend':
'/local/domain/0/backend/vbd/29/768'} to
/local/domain/29/device/vbd/768.
[2006-05-02 10:58:13 xend] DEBUG (DevController:105) DevController:
writing {'domain': 'j_sles10b9_full', 'frontend':
'/local/domain/29/device/vbd/768', 'dev': 'ioemu:hda', 'state': '1',
'params': '/var/lib/xen/images/j_sles10b9_full/hda', 'mode': 'w',
'frontend-id': '29', 'type': 'file'} to
/local/domain/0/backend/vbd/29/768.
[2006-05-02 10:58:13 xend] DEBUG (DevController:103) DevController:
writing {'state': '1', 'backend-id': '0', 'backend':
'/local/domain/0/backend/vif/29/0'} to /local/domain/29/device/vif/0.
[2006-05-02 10:58:13 xend] DEBUG (DevController:105) DevController:
writing {'bridge': 'xenbr0', 'domain': 'j_sles10b9_full', 'handle': '0',
'script': '/etc/xen/scripts/vif-bridge', 'state': '1', 'frontend':
'/local/domain/29/device/vif/0', 'mac': '00:16:3e:b2:68:1d',
'frontend-id': '29', 'type': 'ioemu'} to
/local/domain/0/backend/vif/29/0.
[2006-05-02 10:58:13 xend] INFO (image:355) spawning device models:
/usr/lib/xen/bin/qemu-dm ['/usr/lib/xen/bin/qemu-dm', '-d', '29', '-m',
'512', '-cdrom', '/tests/iso/SLES-10-i386-Beta9.iso', '-boot', 'c',
'-std-vga', '-vcpus', '1', '-domain-name', 'j_sles10b9_full', '-hda',
'/var/lib/xen/images/j_sles10b9_full/hda', '-macaddr',
'00:16:3e:b2:68:1d', '-bridge', 'xenbr0', '-nics', '1']
[2006-05-02 10:58:13 xend] INFO (image:357) device model pid: 3496
[2006-05-02 10:58:13 xend.XendDomainInfo] DEBUG (XendDomainInfo:675)
Storing VM details: {'ssidref': '0', 'uuid':
'a3fc6694-3959-b4bf-85b3-0364c231c504', 'on_reboot': 'destroy',
'start_time': '1146589093.41', 'on_poweroff': 'destroy', 'name':
'j_sles10b9_full', 'vcpus': '1', 'vcpu_avail': '1', 'memory': '512',
'on_crash': 'destroy', 'image': '(hvm (kernel
/usr/lib/xen/boot/hvmloader) (device_model /usr/lib/xen/bin/qemu-dm)
(boot c) (cdrom /tests/iso/SLES-10-i386-Beta9.iso) (sdl 1) (stdvga 1)
(vcpus 1))', 'maxmem': '512'}
[2006-05-02 10:58:13 xend.XendDomainInfo] DEBUG (XendDomainInfo:700)
Storing domain details: {'console/port': '2', 'name': 'j_sles10b9_full',
'console/limit': '1048576', 'vm':
'/vm/a3fc6694-3959-b4bf-85b3-0364c231c504', 'domid': '29',
'cpu/0/availability': 'online', 'memory/target': '524288',
'store/ring-ref': '682307', 'store/port': '1'}
[2006-05-02 10:58:13 xend] DEBUG (image:432) hvm_shutdown fired,
shutdown reason=None
[2006-05-02 10:58:13 xend.XendDomainInfo] DEBUG (XendDomainInfo:881)
XendDomainInfo.handleShutdownWatch
18 years, 7 months
