August 2007 - Devel - libvirt List Archives

[Libvir] [PATCH] Check the version of Xen in xenDaemonAttachDevice()
by Masayuki Sunou 16 Aug '07

16 Aug '07

Hi When virsh attach-disk/attach-interface is executed in < Xen 3.0.4, the OS type of domain is NULL in xenDaemonAttachDevice(). As a result, the command becomes segmentation fault. This patch fixes it by checking the version of Xen in xenDaemonAttachDevice(). Signed-off-by: Masayuki Sunou <fj1826dm(a)aa.jp.fujitsu.com> Thanks, Masayuki Sunou. ---------------------------------------------------------------------- Index: src/xend_internal.c =================================================================== RCS file: /data/cvs/libvirt/src/xend_internal.c,v retrieving revision 1.132 diff -u -p -r1.132 xend_internal.c --- src/xend_internal.c 9 Aug 2007 20:19:12 -0000 1.132 +++ src/xend_internal.c 16 Aug 2007 07:38:42 -0000 @@ -3091,6 +3091,9 @@ xenDaemonAttachDevice(virDomainPtr domai priv = (xenUnifiedPrivatePtr) domain->conn->privateData; + if (domain->id < 0 && priv->xendConfigVersion < 3) + return(-1); + str = virDomainGetOSType(domain); if (strcmp(str, "linux")) hvm = 1; ----------------------------------------------------------------------

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[Libvir] [PATCH] Check a value in vshCommandOptInt()
by Masayuki Sunou 16 Aug '07

16 Aug '07

Hi When the option which should set a number is set a character which is not a number, the value is changed into 0 in libvirt. It causes the movement not expected. ex) # virsh vcpupin dom_name A 0,1 => VCPU0 is pinned without the command becoming the error. This patch fixes it by checking the value in vshCommandOptInt(). Signed-off-by: Masayuki Sunou <fj1826dm(a)aa.jp.fujitsu.com> Thanks, Masayuki Sunou. ---------------------------------------------------------------------- Index: src/virsh.c =================================================================== RCS file: /data/cvs/libvirt/src/virsh.c,v retrieving revision 1.95 diff -u -p -r1.95 virsh.c --- src/virsh.c 14 Aug 2007 07:07:57 -0000 1.95 +++ src/virsh.c 16 Aug 2007 07:13:46 -0000 @@ -3699,12 +3699,16 @@ static int vshCommandOptInt(vshCmd * cmd, const char *name, int *found) { vshCmdOpt *arg = vshCommandOpt(cmd, name); - int res = 0; + int res = 0, num_found = TRUE; + char *end_p=NULL; if (arg) - res = atoi(arg->data); + res = strtol(arg->data, &end_p, 10); + if (arg->data == end_p) { + num_found = FALSE; + } if (found) - *found = arg ? TRUE : FALSE; + *found = (arg && num_found) ? TRUE : FALSE; return res; } ----------------------------------------------------------------------

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[Libvir] Networking functions in libvirt
by Bruce Evans 15 Aug '07

15 Aug '07

Hello, I am now starting to investigate the networking driver callback functions in libvirt. struct _virNetworkDriver { virDrvOpen open; virDrvClose close; virDrvNumOfNetworks numOfNetworks; virDrvListNetworks listNetworks; virDrvNumOfDefinedNetworks numOfDefinedNetworks; virDrvListDefinedNetworks listDefinedNetworks; virDrvNetworkLookupByUUID networkLookupByUUID; virDrvNetworkLookupByName networkLookupByName; virDrvNetworkCreateXML networkCreateXML; virDrvNetworkDefineXML networkDefineXML; virDrvNetworkUndefine networkUndefine; virDrvNetworkCreate networkCreate; virDrvNetworkDestroy networkDestroy; virDrvNetworkDumpXML networkDumpXML; virDrvNetworkGetBridgeName networkGetBridgeName; virDrvNetworkGetAutostart networkGetAutostart; virDrvNetworkSetAutostart networkSetAutostart; }; My question is from the point of view of the Virtual Manager GUI. From the controls available in the GUI, what actions are intended to be done, via the network callback functions? Are the actions only client related? Create a vnet, vdisk, etc? Or are they also intended for server actions, create a switch service, disk service, etc? There is no example in the test.c program, so I don't have any example to look at. Also, is there any documentation describing the network callback functions? TIA, -Bruce Evans Sun Microsystems Systems Virtualization

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[Libvir] [patch] virsh setvcpus range check for negative value case
by Atsushi SAKAI 15 Aug '07

15 Aug '07

Hi, This patch adds virsh setvcpus range check for negative value case. for example to the inactive domain virsh setvcpus -1 sets vcpus=4294967295 And cannot boot the inactive domain. Signed-off-by: Atsushi SAKAI <sakaia(a)jp.fujitsu.com> Thanks Atsushi SAKAI

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[Libvir] [PATCH] fix UUID lookup when using the proxy
by Daniel Veillard 14 Aug '07

14 Aug '07

Chasing a bug at Red Hat I noticed that the code never copied the UUID onto the packet sent to the proxy, which of course makes things harder. Finding why this still worked on 32bits hosts is left as an exercise for interested readers ! (of course I wrote that code on a 32 bits machine at the time) One line patch enclosed, Daniel -- Red Hat Virtualization group http://redhat.com/virtualization/ Daniel Veillard | virtualization library http://libvirt.org/ veillard(a)redhat.com | libxml GNOME XML XSLT toolkit http://xmlsoft.org/ http://veillard.com/ | Rpmfind RPM search engine http://rpmfind.net/

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[Libvir] fix SYNOPSIS of virsh --help schedinfo
by Atsushi SAKAI 14 Aug '07

14 Aug '07

fix SYNOPSIS of virsh --help schedinfo. from sched to schedinfo Thanks Atsushi SAKAI

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[Libvir] several typo fixes on man virsh
by Atsushi SAKAI 14 Aug '07

14 Aug '07

Hi, several typo fixes on man virsh (uses ispell) interract -> interact suports -> supports privledges -> privileges synoposis -> synopsis documetnation -> documentation runable -> runnable Ouput -> Output guaruntee -> guarantee processus -> processes (2 typo) Detatch -> Detach dvices -> devices instanciated -> instantiated Thanks Atsushi SAKAI

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[Libvir] [PATCH 0/7] QEMU/KVM save/restore support, take 3
by Jim Paris 14 Aug '07

14 Aug '07

Here's take 3 of the QEMU/KVM save/restore support. Thanks for your input. Changes since last time: - Remove escape sequence filtering, it's not necessary. - Clean up stdin handling in virExec, use -1 to signify unused - Add signal-safe read/write wrappers that handle EINTR and use them. - Add version and padding to image header, and check version on restore. - Include null-termination in XML data & length - Show name of conflicting domain in error message Everything seems to work well in my tests. I've run into a few rare cases where the migration doesn't work correctly (causing segfaults in the guest, or kvm to crash), but it's not libvirt's fault, and libvirt handles the failures well. (I suspect it's related to http://article.gmane.org/gmane.comp.emulators.kvm.devel/5583) Thanks, -jim

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[Libvir] save/restore support for KVM
by Jim Paris 13 Aug '07

13 Aug '07

Hi, I've implemented save/restore support for KVM using the live migration feature. First, a few patches to KVM to fix bugs: Subject: [PATCH 1/3] qemu: fix freed pointer dereference http://article.gmane.org/gmane.comp.emulators.kvm.devel/5572 Subject: [PATCH 2/3] qemu: don't start a new migration if one is already in progress http://article.gmane.org/gmane.comp.emulators.kvm.devel/5575 Subject: [PATCH 3/3] qemu: reset buffer pointers after CR/LF http://article.gmane.org/gmane.comp.emulators.kvm.devel/5573 (If compatibility with old KVM is wanted, it might be possible to work around the kvm bugs in other ways, but I'm not sure). Then, another patch to KVM to support inbound migration from a filename. It already supports migration from stdin, but adding this seemed easier from a libvirt perspective. Subject: [PATCH] qemu: accept filename for incoming migration http://article.gmane.org/gmane.comp.emulators.kvm.devel/5590 Finally, the libvirt side. Some notes: - Arbitrary decisions about VM status: I pause the VM before starting migration, and destroy it once it's finished. Neither is required by KVM but I'd be concerned about the disk image state otherwise. Also, after resuming, the VM is still paused. I don't know how Xen behaves in this regard but the behavior here is easy enough to change. - I append the domain's UUID at the end of the migration image. This doesn't affect KVM at all (it ignores the extra data). Does that seem reasonable? It's unclear how the saved image is supposed to get associated with a particular VM configuration without doing something like this. - I added the migrateFrom field to the qemu_vm struct. Dunno if that's the best place. Could also add put it in qemu_vm_def, or add parameters to qemudStartVMDaemon, etc.. Patch against current CVS is below. Signed-off-by: Jim Paris <jim(a)jtan.com> -jim Index: src/qemu_conf.c =================================================================== RCS file: /data/cvs/libvirt/src/qemu_conf.c,v retrieving revision 1.10 diff -u -r1.10 qemu_conf.c --- src/qemu_conf.c 7 Aug 2007 13:02:35 -0000 1.10 +++ src/qemu_conf.c 9 Aug 2007 21:15:10 -0000 @@ -1518,7 +1518,8 @@ (vm->def->os.initrd[0] ? 2 : 0) + /* initrd */ (vm->def->os.cmdline[0] ? 2 : 0) + /* cmdline */ (vm->def->graphicsType == QEMUD_GRAPHICS_VNC ? 2 : - (vm->def->graphicsType == QEMUD_GRAPHICS_SDL ? 0 : 1)); /* graphics */ + (vm->def->graphicsType == QEMUD_GRAPHICS_SDL ? 0 : 1)) + /* graphics */ + (vm->migrateFrom[0] ? 3 : 0); /* migrateFrom */ snprintf(memory, sizeof(memory), "%d", vm->def->memory/1024); snprintf(vcpus, sizeof(vcpus), "%d", vm->def->vcpus); @@ -1767,6 +1768,15 @@ /* SDL is the default. no args needed */ } + if (vm->migrateFrom[0]) { + if (!((*argv)[++n] = strdup("-S"))) + goto no_memory; + if (!((*argv)[++n] = strdup("-incoming"))) + goto no_memory; + if (!((*argv)[++n] = strdup(vm->migrateFrom))) + goto no_memory; + } + (*argv)[++n] = NULL; return 0; Index: src/qemu_conf.h =================================================================== RCS file: /data/cvs/libvirt/src/qemu_conf.h,v retrieving revision 1.6 diff -u -r1.6 qemu_conf.h --- src/qemu_conf.h 30 Jul 2007 09:59:06 -0000 1.6 +++ src/qemu_conf.h 9 Aug 2007 21:15:10 -0000 @@ -213,6 +213,7 @@ char configFile[PATH_MAX]; char autostartLink[PATH_MAX]; + char migrateFrom[PATH_MAX]; struct qemud_vm_def *def; /* The current definition */ struct qemud_vm_def *newDef; /* New definition to activate at shutdown */ Index: src/qemu_driver.c =================================================================== RCS file: /data/cvs/libvirt/src/qemu_driver.c,v retrieving revision 1.14 diff -u -r1.14 qemu_driver.c --- src/qemu_driver.c 30 Jul 2007 09:59:06 -0000 1.14 +++ src/qemu_driver.c 9 Aug 2007 21:15:10 -0000 @@ -656,7 +656,7 @@ if (virExecNonBlock(conn, argv, &vm->pid, &vm->stdout, &vm->stderr) == 0) { vm->id = driver->nextvmid++; - vm->state = VIR_DOMAIN_RUNNING; + vm->state = vm->migrateFrom[0] ? VIR_DOMAIN_PAUSED : VIR_DOMAIN_RUNNING; driver->ninactivevms--; driver->nactivevms++; @@ -1852,29 +1852,151 @@ return 0; } +#define QEMUD_SAVE_MAGIC "LibvirtQemudUUID" -static int qemudDomainSave(virDomainPtr dom, - const char *path ATTRIBUTE_UNUSED) { +static int qemudDomainSave(virDomainPtr dom, + const char *path) { struct qemud_driver *driver = (struct qemud_driver *)dom->conn->privateData; struct qemud_vm *vm = qemudFindVMByID(driver, dom->id); + char *command, *info; + int fd; + if (!vm) { - qemudReportError(dom->conn, dom, NULL, VIR_ERR_INVALID_DOMAIN, "no domain with matching id %d", dom->id); + qemudReportError(dom->conn, dom, NULL, VIR_ERR_INVALID_DOMAIN, + "no domain with matching id %d", dom->id); return -1; } + if (!qemudIsActiveVM(vm)) { - qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED, "domain is not running"); + qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED, + "domain is not running"); return -1; } - qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED, "save is not supported"); - return -1; + + if (strchr(path, '\'') || strchr(path, '\\') ) { + qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED, + "invalid filename"); + return -1; + } + + /* Pause */ + if (qemudDomainSuspend(dom) != 0) { + qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED, + "failed to pause domain"); + return -1; + } + + /* Migrate to file. */ + if (asprintf (&command, "migrate \"exec:dd of='%s' 2>/dev/null\"\n", + path) == -1) { + qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED, + "out of memory"); + return -1; + } + + if (qemudMonitorCommand(driver, vm, command, &info) < 0) { + qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED, + "migrate operation failed"); + free(command); + return -1; + } + + free(info); + free(command); + + /* Append the UUID, which we'll need in order to restore the domain. */ + if ((fd = open(path, O_APPEND|O_WRONLY)) < 0) { + qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED, + "failed to open '%s'", path); + return -1; + } + + if (write(fd, QEMUD_SAVE_MAGIC, sizeof(QEMUD_SAVE_MAGIC)) != + sizeof(QEMUD_SAVE_MAGIC)) { + qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED, + "failed to write magic"); + close(fd); + return -1; + } + + if (write(fd, dom->uuid, VIR_UUID_BUFLEN) != VIR_UUID_BUFLEN) { + qemudReportError(dom->conn, dom, NULL, VIR_ERR_OPERATION_FAILED, + "failed to write uuid"); + close(fd); + return -1; + } + close(fd); + + /* Shut it down */ + qemudShutdownVMDaemon(dom->conn, driver, vm); + if (!vm->configFile[0]) + qemudRemoveInactiveVM(driver, vm); + + return 0; } static int qemudDomainRestore(virConnectPtr conn, - const char *path ATTRIBUTE_UNUSED) { - /*struct qemud_driver *driver = (struct qemud_driver *)conn->privateData;*/ - qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED, "restore is not supported"); - return -1; + const char *path) { + struct qemud_driver *driver = (struct qemud_driver *)conn->privateData; + unsigned char uuid[VIR_UUID_BUFLEN]; + unsigned char magic[sizeof(QEMUD_SAVE_MAGIC)]; + virDomainPtr dom; + struct qemud_vm *vm; + int fd; + + /* Find the UUID */ + if ((fd = open(path, O_RDONLY)) < 0) { + qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED, + "cannot read domain image"); + return -1; + } + if (lseek(fd, 0 - (sizeof(magic) + sizeof(uuid)), SEEK_END) == -1) { + qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED, + "failed to seek to end of domain image"); + close(fd); + return -1; + } + if (read(fd, magic, sizeof(magic)) != sizeof(magic)) { + qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED, + "failed to read domain image"); + close(fd); + return -1; + } + if (memcmp(magic, QEMUD_SAVE_MAGIC, sizeof(magic))) { + qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED, + "image magic is not correct"); + close(fd); + return -1; + } + if (read(fd, uuid, sizeof(uuid)) != sizeof(uuid)) { + qemudReportError(conn, NULL, NULL, VIR_ERR_OPERATION_FAILED, + "failed to read domain UUID from image"); + close(fd); + return -1; + } + close(fd); + + /* Find the domain & vm */ + dom = qemudDomainLookupByUUID(conn, uuid); + if (!dom) { + qemudReportError(conn, NULL, NULL, VIR_ERR_INVALID_DOMAIN, + "no domain with matching uuid"); + return -1; + } + + vm = qemudFindVMByUUID(driver, dom->uuid); + if (!vm) { + qemudReportError(conn, dom, NULL, VIR_ERR_INVALID_DOMAIN, + "no vm with matching uuid"); + return -1; + } + + /* Set the migration source and start it up. */ + snprintf(vm->migrateFrom, sizeof(vm->migrateFrom), "file://%s", path); + vm->migrateFrom[sizeof(vm->migrateFrom)-1] = '\0'; + + return qemudStartVMDaemon(dom->conn, driver, vm); } @@ -1931,6 +2053,7 @@ return -1; } + vm->migrateFrom[0] = '\0'; return qemudStartVMDaemon(dom->conn, driver, vm); }

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[Libvir] [PATCH] Block device and network stats
by Richard W.M. Jones 13 Aug '07

13 Aug '07

This is the implementation (currently Xen, local only). It includes a couple of virsh commands if you want to play with looking at the stats. Rich. -- Emerging Technologies, Red Hat - http://et.redhat.com/~rjones/ Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 03798903

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