April 2007 - Devel - libvirt List Archives

[Libvir] [PATCH] virsh version
by Atsushi SAKAI 16 Apr '07

16 Apr '07

Hi, Currently virsh version is not work. Currently just show the libvirt version only. This is caused by mis-matching of xen(xen_unified.c) and Xen(libvirt.c) . I do not know the policy. So I attached 2 Pattern. Thanks Atsushi SAKAI =================Pattern1================ --- libvirt.orig/src/xen_unified.c 2007-04-13 09:43:57.000000000 +0900 +++ libvirt.Xen/src/xen_unified.c 2007-04-13 20:02:46.000000000 +0900 @@ -89,8 +89,8 @@ xenUnifiedOpen (virConnectPtr conn, cons /* If name == NULL, name == "", or begins with "xen", then it's for us. */ if (!name || name[0] == '\0') - name = "xen"; - if (strncasecmp (name, "xen", 3) != 0) + name = "Xen"; + if (strncasecmp (name, "Xen", 3) != 0) return VIR_DRV_OPEN_DECLINED; /* Allocate per-connection private data. */ @@ -719,7 +719,7 @@ xenUnifiedDomainSetAutostart (virDomainP /* The interface which we export upwards to libvirt.c. */ static virDriver xenUnifiedDriver = { .no = VIR_DRV_XEN_UNIFIED, - .name = "xen", + .name = "Xen", .ver = VERSION, .open = xenUnifiedOpen, .close = xenUnifiedClose, =================Pattern2================ --- libvirt.orig/src/libvirt.c 2007-04-12 23:18:39.000000000 +0900 +++ libvirt.Xen/src/libvirt.c 2007-04-13 20:09:02.000000000 +0900 @@ -246,7 +246,7 @@ virGetVersion(unsigned long *libVer, con if (typeVer != NULL) { if (type == NULL) - type = "Xen"; + type = "xen"; for (i = 0;i < virDriverTabCount;i++) { if ((virDriverTab[i] != NULL) && (!strcmp(virDriverTab[i]->name, type))) {

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[Libvir] PATCH: Check for /usr/bin/qemu* binaries before starting guest
by Daniel P. Berrange 16 Apr '07

16 Apr '07

The attached patch fixes two issues - It explicitly checks to see if the requested /usr/bin/qemu* binary actually exists before fork()/exec()'ing it. While its technically possible to catch the execve() failure of ENOENT, its a real pain to feed this error back to the qemu daemon because we're in a sub-process at that point. The obvious & easy solution is to thus check to see if the binary exists before trying to fork. - It only passes the -no-kqemu flag if we're running matching arch to the host. Previously it would pass the -no-kqemu flag even if running an x86_64 guest on i686 platform - QEMU then exited with error because the -no-kqemu flag is not recognised on x86_64 when running on i686 host. 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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[Libvir] PATCH: Added QEMU driver for virDomainGetOSType method
by Daniel P. Berrange 15 Apr '07

15 Apr '07

For some reason we never had an impl of the virDomainGetOSType method for the QEMU driver - and for even more bizarre reason it wasn't failing, because the old libvirt.c code hardcoded 'linux' if there was no impl. The latter was fixed by Rich, with the xenUnified driver, so exposing the former bug. This patch adds a simple impl for QEMU - there's no need to talk to the daemon in this case because QEMU guests can only ever by of type 'hvm'. 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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[Libvir] PATCH: Fix exception reporting for virNetwork / virDomain python methods
by Daniel P. Berrange 15 Apr '07

15 Apr '07

The virError() class in the python bindings will either pick up the global error details, or will extract them from the virConnect private error details. For the latter to work, you must pass in a virConnect object when creating the virError. I'd previously fixed up the generator so that was done correctly for any method on virConnectPtr, however, I forgot that a similar fix was needed for the virDomainPtr / virNetworkPtr related methods. Currently we're getting back zero useful information in the python layer with a virDomain* or virNetwork* method fails. Unfortunately, given a virDomainPtr / virNetworkPtr object in python, there is no easy way to get back the virConnectPtr object. So this patch does two things - it passes the virConnect python object into the constructor of the virDomain / virNetwork python objects, and then stores it in a private _conn attribute. Then, the virNetwork/virDomain objects are passed into the virError() classes when needeed so it can get hold of the private error details. So with this patch, virt-manager will get sensible error information when attempting to start an inactive guest, or when doing device hot-add/remove. BTW, since we now store an explicit reference to the virConnect object, I removed the generic 'self.ref' back-reference. 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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[Libvir] PATCH: support Xen 3.0.5
by Daniel P. Berrange 13 Apr '07

13 Apr '07

I've been doing some testing with current xen-unstable (ie what will very shortly be 3.0.5) and came across a whole bunch of things which needed fixing - some expected, others not expected. The attached patch addresses the following issues: - Many of the hypercalls have their structs changed so that int64_t or 'foo *' members are always 64-bit aligned even on 32-bit platforms. This is part of the work to allow 32-bit Dom0/DomU to work on 64-bit hypervisor. For the int64_t types I had to annotate with __attribute__((aligned(8))). This did not work for pointer data types, so I for those I had to do a more complex hack with union { foo *v; int64_t pad __attribute__((aligned(8))) } This matches what is done in the public (BSD licensed) Xen HV header files. We already had ways to deal with v0 vs v2 hypercalls structs. This change is still techincally v2, but just a minor revision of the domctl or sysctl interfaces. Thus I have named the extra structs v2d5 or v2s3 to indicated hypercall version 2, domctl version 5 or hypercall version 2, sysctl version 3 respectively. - The 'flags' field in the getdomaininfo hypercall now has an extra flag defined '(1<<1)' which was previously not used, is now used to indicate that the guest is HVM. Thus when fetching domain state, we have to mask out that flag, otherwise we'll never match the correct paused/running/ blocked/etc states. - In the xenHypervisorNumOfDomains method, under certain scenarios we will re-try the hypercall, allocating a bigger memory buffer. Well due to the ABI alignment changes we hit that scenario everytime, and ended up allocating a multi-GB buffer :-) The fixed structs sort this out, but as a preventative measure for any future HV changes the patch will break out of the loop at the 10,000 guest mark to avoid allocating GB of memory. - The unified Xen driver broke the GetVCPUs method - it was mistakenly checking for return value == 0, instead of > 0. Trivial fix. - The method to open the XenD connection was calling xenDaemonGetVersion to test if the connection succeeded. But then also calling the xend_detect_config_version which does pretty much same thing. So I removed the former, and now we only do the latter as a 'ping' test when opening. This removes 1 HTTP GET which is worthwhile performance boost given how horrifically slow XenD is. - The HVM SEXPR for configuring the VNC / SDL graphics is no longere part of the (image) block. it now matches the PVFB graphics config and is an explicit (vfb) block within the (devices) block. So if xend_config_format >= 4 we use the new style config - this is assuming upstream XenD is patched to increment xend_config_format from 3 to 4 - I send a patch & am confident it will be applied very shortly. - The QEMU device model allows a user to specify multiple devices for the boot order, eg 'andc' to indicated 'floppy', 'network' 'cdrom', 'disk'. We assumed it was a single letter only. I now serialize this into multiple <boot dev='XXX'/> elements, ordered according to priority. The XML -> SEXPR conversion allows the same. I've tested all this on a 32-bit Dom0 running on 32-bit HV, and 64-bit HV, but not tested a 64-bit Dom0 on 64-bit HV. I'm pretty sure it'll work,but if anyone is runnning 64-on-64 please test this patch. 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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[Libvir] [PATCH][RFC] shows scheduler information
by Atsushi SAKAI 12 Apr '07

12 Apr '07

Hi, This patch intends add a showing function of scheduler information. If apply this patch to current revision 1.490 and type virsh dominfo 0 then shows following scheduler information. Currently I assume credit scheduler only. getting function is implemented but setting function is not yet. I just waiting for comments. Id: 0 Name: Domain-0 UUID: 00000000-0000-0000-0000-000000000000 OS Type: linux State: running CPU(s): 1 CPU time: 432.7s Max memory: no limit Used memory: 1933312 kB scheduler info 5 256 0 SchedulerID: 5 Weight: 256 Cap: 0 Thanks Atsushi SAKAI

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[Libvir] [PATCH] Check ReadOnly-flag
by S.Sakamoto 12 Apr '07

12 Apr '07

Hi When a general user uses command "# virsh --connect xen start domain", don't become an error, and domain start. Because ReadOnly-flag is not "1" when a general user uses it. So, here's the patch adds to check ReadOnly-flag. Signed-off-by: Shigeki Sakamoto <fj0588di(a)aa.jp.fujitsu.com> Thanks, Shigeki Sakamoto. Index: src/libvirt.c =================================================================== RCS file: /data/cvs/libvirt/src/libvirt.c,v retrieving revision 1.66 diff -u -p -r1.66 libvirt.c --- src/libvirt.c 4 Apr 2007 14:19:49 -0000 1.66 +++ src/libvirt.c 12 Apr 2007 07:55:32 -0000 @@ -301,6 +301,10 @@ do_open (const char *name, int flags) break; } } + + if (flags & VIR_DRV_OPEN_RO) { + ret->flags = VIR_CONNECT_RO; + } return ret;

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[Libvir] [Q] about virsh-connect
by S.Sakamoto 12 Apr '07

12 Apr '07

Hi, I have a question. 　Previously(libvirt 0.2.1) We can do remote connection via URI successfully.. (virsh --connect http://127.0.0.1:8000 list) But Current version(libvirt-current) cannot connect remotely. This event occurs in both general user and administrator. I investigate the code and found folloing code is included (see line 94) If "name" is not "xen", decline connection. ("# virsh --help connect" is output with "<name> hypervisor connection URI") Is this change intentionally? xen_unified.c =========================================================== 84| static int 85| xenUnifiedOpen (virConnectPtr conn, const char *name, int flags) 86| { 87| int i, j; 88| xenUnifiedPrivatePtr priv; 89| 90| /* If name == NULL, name == "", or begins with "xen", then it's for us. / 91| if (!name || name[0] == '\0') 92| name = "xen"; 93| if (strncasecmp (name, "xen", 3) != 0) 94| return VIR_DRV_OPEN_DECLINED; =========================================================== Thanks, Shigeki Sakamoto.

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[Libvir] [PATCH] virsh dumpxml and create fails with no UNAME cdrom device
by Nobuhiro Itou 11 Apr '07

11 Apr '07

Hi, In the xmexample.hvm(/etc/xen/xmexample.hvm), no UNAME cdrom device is written. disk = [ 'file:/var/images/min-el3-i386.img,hda,w', ',hdc:cdrom,r' ] But virsh dumpxml fails if the domain has virtual cdrom device without UNAME. And virsh create fails if the domain config XML has no UNAME cdrom device, too. The attached patch adds to solve this problem. Signed-off-by: Nobuhiro Itou <fj0873gn(a)aa.jp.fujitsu.com> Thanks, Nobuhiro Itou.

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[Libvir] RFC [0/3]: Re-factor QEMU daemon protocol to use XDR
by Daniel P. Berrange 11 Apr '07

11 Apr '07

I've been thinking about a way to move forward on the remote management capabilities in libvirt since our last list discussion didn't come to any clear agreement. The current situation - QEMUD daemon uses a hand-crafted protocol basically just dumping structs on the wire. Key points: - Fairly simple to understand code for marshalling/demarshalling - Very low overhead on wire - Not safe endianess - Not safe wrt to architecture data alignment rules - No authentication/encryption - Server driver specific to QEMU - The generic libvirt daemon uses SunRPC as the underlying protocol. - Protocol versioning - Safe wrt to endianess - Safe wrt to architecture data alignment rules - Added TLS encryption / SSH tunneling - Generic for any libvirt backend - Doesn't work with non-blocking sockets due to SunRPC limitations - SunRPC api is not well known / 'wierd' - Call + reply only; no async signals from server Looking at the current impl of the generic libvirt daemon there are some things which strike me: 1. We have an extra layer of marshalling/demarshalling calls. ie the methods in the libvirt driver, call to the SunRPC marshalling methods, which populate an XDR generated struct, which call the XDR routines to write the data. 2. The main loop doesn't allow us to listen for other non-SunRPC file handles (eg the QEMU/dnsmasq processes). 3. We've basically re-written the the SunRPC svc*_create methods to get support for TLS / SSH We are going to need to address 2 by creating our own mainloop impl. For point 1 we can have the libvirt driver populate the XDR struct directly and eliminate the SunRPC generated marshalling stubs completely. If we did that, and given points 2 & 3, we're basically left using very little of the SunRPC capabilities at all. Pretty much only thing it is doing for us at that point is the protocol versioning, and giving us a horrific API which doesn't support non-blocking IO so forces us to be multi-threads or multi-process. So, I'm thinking why don't we just use XDR directly & be done with it. As an experiment I took the existing QEMU daemon & driver and re-factored the hand written binary protocol to use XDR instead. Looking at the diffstat - there was basically no appreciable difference in codesize after the re-factoring, and we get the added benefit of being endianness & alignment safe. qemud/Makefile.am | 15 + qemud/conf.c | 1 qemud/dispatch.c | 538 ++++++++++++++++------------------------------ qemud/dispatch.h | 2 qemud/internal.h | 21 + qemud/protocol.h | 329 ---------------------------- qemud/protocol.x | 608 ++++++++++++++++++++++++++++++++++++++++++++++++++++ qemud/qemud.c | 189 +++++++++++----- qemud/uuid.c | 1 src/Makefile.am | 11 src/internal.h | 2 src/qemu_internal.c | 593 ++++++++++++++++++++++++++------------------------ 12 files changed, 1288 insertions(+), 1022 deletions(-) The particular changes I'll explain in the next 3 mails where I attach the patches. Meanwhile though, I'm thinking we could take approach of incremental code refactoring, pulling in all the various capabilities from the remote patch (except for the SunRPC demarshalling itself) to the QEMU daemon. At each stage having a working daemon & client but with ever growing capabilities, until it provides full remote management. 1. Add an extra initial message type to do a major/minor version number exchange. Based on the negotiated versions, the server can activate or deactivate particular requests it allows from the client. 2. Add in the URI parsing routines to the qemud_interal.c driver, but only allow use of QEMU initially. 3. Add in the TLS + SSH client & server socket setup code to give an authenticated & secured remote channel 4. Re-factor qemud/dispatch.c so that it calls into the regular libvirt API for the Xen case, but keeps calling qemud/driver.c for the QEMU case. BTW, these patches are not intended to be applied to CVS - they're for discussion purposes at this stage. That said, they are fully functional so you can apply them to your checkout & you should be able run all the existing virsh commands against the libvirt_qemud. Just make sure you patch & rebuild both the client & server ;-) 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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