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[libvirt] [PATCH]: Add a flag to let live migration be persistent
by Chris Lalancette 20 May '09

20 May '09

As pointed out by Łukasz Mierzwa <l.mierzwa(a)gmail.com>, it would be nice if there was an option to automatically make a domain persistent on the destination during a live migration. The attached patch adds this simple capability. Note that this has to be applied on top of my previous secure migration patch, otherwise you'll have conflicts. Signed-off-by: Chris Lalancette <clalance(a)redhat.com>

3 5

[libvirt] PATCH: Test the QEMU argv -> XML convertor
by Daniel P. Berrange 20 May '09

20 May '09

This patch adds a test case which validates the argv -> XML convertor for QEMU. This re-uses the existing XML data files from the XML -> argv test. This has a few complications though because we can't roundtrip all the data. So I have a couple really seriously evil regexes which splice out the XML lines we know won't match - name, uuid, memory and disk sharing modes. This isn't ideal, but I figure it is better todo this and get coverage over 90% of the code, than to have no test coverage. Thanks to Cole for this testsuite suggestion Daniel diff -r 453b896e0e3f .hgignore --- a/.hgignore Tue May 19 18:43:32 2009 +0100 +++ b/.hgignore Tue May 19 18:43:50 2009 +0100 @@ -270,6 +270,7 @@ tests/object-locking tests/object-locking-files.txt tests/object-locking.cmi tests/object-locking.cmx +tests/qemuargv2xmltest tests/qemuxml2argvtest tests/qemuxml2xmltest tests/qparamtest diff -r 453b896e0e3f tests/.cvsignore --- a/tests/.cvsignore Tue May 19 18:43:32 2009 +0100 +++ b/tests/.cvsignore Tue May 19 18:43:50 2009 +0100 @@ -11,6 +11,7 @@ xmconfigtest xencapstest qemuxml2xmltest qemuxml2argvtest +qemuargv2xmltest nodedevxml2xmltest nodeinfotest statstest diff -r 453b896e0e3f tests/.gitignore --- a/tests/.gitignore Tue May 19 18:43:32 2009 +0100 +++ b/tests/.gitignore Tue May 19 18:43:50 2009 +0100 @@ -11,6 +11,7 @@ xmconfigtest xencapstest qemuxml2xmltest qemuxml2argvtest +qemuargv2xmltest nodedevxml2xmltest nodeinfotest statstest diff -r 453b896e0e3f tests/Makefile.am --- a/tests/Makefile.am Tue May 19 18:43:32 2009 +0100 +++ b/tests/Makefile.am Tue May 19 18:43:50 2009 +0100 @@ -61,7 +61,7 @@ noinst_PROGRAMS += xml2sexprtest sexpr2x reconnect xmconfigtest xencapstest endif if WITH_QEMU -noinst_PROGRAMS += qemuxml2argvtest qemuxml2xmltest +noinst_PROGRAMS += qemuxml2argvtest qemuxml2xmltest qemuargv2xmltest endif if WITH_SECDRIVER_SELINUX @@ -119,7 +119,7 @@ endif endif if WITH_QEMU -TESTS += qemuxml2argvtest qemuxml2xmltest +TESTS += qemuxml2argvtest qemuxml2xmltest qemuargv2xmltest endif if WITH_SECDRIVER_SELINUX @@ -194,8 +194,13 @@ qemuxml2xmltest_SOURCES = \ qemuxml2xmltest.c testutilsqemu.c testutilsqemu.h \ testutils.c testutils.h qemuxml2xmltest_LDADD = ../src/libvirt_driver_qemu.la $(LDADDS) + +qemuargv2xmltest_SOURCES = \ + qemuargv2xmltest.c testutilsqemu.c testutilsqemu.h \ + testutils.c testutils.h +qemuargv2xmltest_LDADD = ../src/libvirt_driver_qemu.la $(LDADDS) else -EXTRA_DIST += qemuxml2argvtest.c qemuxml2xmltest.c testutilsqemu.c testutilsqemu.h +EXTRA_DIST += qemuxml2argvtest.c qemuxml2xmltest.c qemuargv2xmltest.c testutilsqemu.c testutilsqemu.h endif nodedevxml2xmltest_SOURCES = \ diff -r 453b896e0e3f tests/qemuargv2xmltest.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/tests/qemuargv2xmltest.c Tue May 19 18:43:50 2009 +0100 @@ -0,0 +1,235 @@ +#include <config.h> + +#include <stdio.h> +#include <stdlib.h> +#include <unistd.h> +#include <string.h> + +#include <sys/types.h> +#include <fcntl.h> + +#ifdef WITH_QEMU + +#include "internal.h" +#include "testutils.h" +#include "qemu_conf.h" + +#include "testutilsqemu.h" + +static char *progname; +static char *abs_srcdir; +static struct qemud_driver driver; + +#define MAX_FILE 4096 + +static int blankProblemElements(char *data) +{ + if (virtTestClearLineRegex("<name>[[:alnum:]]+</name>", data) < 0 || + virtTestClearLineRegex("<uuid>([[:alnum:]]|-)+</uuid>", data) < 0 || + virtTestClearLineRegex("<memory>[[:digit:]]+</memory>", data) < 0 || + virtTestClearLineRegex("<currentMemory>[[:digit:]]+</currentMemory>", data) < 0 || + virtTestClearLineRegex("<readonly/>", data) < 0 || + virtTestClearLineRegex("<sharable/>", data) < 0) + return -1; + return 0; +} + +static int testCompareXMLToArgvFiles(const char *xml, + const char *cmdfile) { + char xmlData[MAX_FILE]; + char cmdData[MAX_FILE]; + char *expectxml = &(xmlData[0]); + char *actualxml = NULL; + char *cmd = &(cmdData[0]); + int ret = -1; + virDomainDefPtr vmdef = NULL; + + if (virtTestLoadFile(cmdfile, &cmd, MAX_FILE) < 0) + goto fail; + if (virtTestLoadFile(xml, &expectxml, MAX_FILE) < 0) + goto fail; + + if (!(vmdef = qemuParseCommandLineString(NULL, cmd))) + goto fail; + + if (!(actualxml = virDomainDefFormat(NULL, vmdef, 0))) + goto fail; + + if (blankProblemElements(expectxml) < 0 || + blankProblemElements(actualxml) < 0) + goto fail; + + if (STRNEQ(expectxml, actualxml)) { + virtTestDifference(stderr, expectxml, actualxml); + goto fail; + } + + ret = 0; + + fail: + free(actualxml); + virDomainDefFree(vmdef); + return ret; +} + + +struct testInfo { + const char *name; + int extraFlags; + const char *migrateFrom; +}; + +static int testCompareXMLToArgvHelper(const void *data) { + const struct testInfo *info = data; + char xml[PATH_MAX]; + char args[PATH_MAX]; + snprintf(xml, PATH_MAX, "%s/qemuxml2argvdata/qemuxml2argv-%s.xml", + abs_srcdir, info->name); + snprintf(args, PATH_MAX, "%s/qemuxml2argvdata/qemuxml2argv-%s.args", + abs_srcdir, info->name); + return testCompareXMLToArgvFiles(xml, args); +} + + + +static int +mymain(int argc, char **argv) +{ + int ret = 0; + char cwd[PATH_MAX]; + + progname = argv[0]; + + if (argc > 1) { + fprintf(stderr, "Usage: %s\n", progname); + return (EXIT_FAILURE); + } + + abs_srcdir = getenv("abs_srcdir"); + if (!abs_srcdir) + abs_srcdir = getcwd(cwd, sizeof(cwd)); + + if ((driver.caps = testQemuCapsInit()) == NULL) + return EXIT_FAILURE; + if((driver.stateDir = strdup("/nowhere")) == NULL) + return EXIT_FAILURE; + +#define DO_TEST_FULL(name, extraFlags, migrateFrom) \ + do { \ + const struct testInfo info = { name, extraFlags, migrateFrom }; \ + if (virtTestRun("QEMU ARGV-2-XML " name, \ + 1, testCompareXMLToArgvHelper, &info) < 0) \ + ret = -1; \ + } while (0) + +#define DO_TEST(name, extraFlags) \ + DO_TEST_FULL(name, extraFlags, NULL) + + setenv("PATH", "/bin", 1); + setenv("USER", "test", 1); + setenv("LOGNAME", "test", 1); + setenv("HOME", "/home/test", 1); + unsetenv("TMPDIR"); + unsetenv("LD_PRELOAD"); + unsetenv("LD_LIBRARY_PATH"); + + /* Can't roundtrip vcpu cpuset attribute */ + /*DO_TEST("minimal", QEMUD_CMD_FLAG_NAME);*/ + DO_TEST("boot-cdrom", 0); + DO_TEST("boot-network", 0); + DO_TEST("boot-floppy", 0); + /* Can't roundtrip xenner arch */ + /*DO_TEST("bootloader", 0);*/ + DO_TEST("clock-utc", 0); + DO_TEST("clock-localtime", 0); + DO_TEST("disk-cdrom", 0); + DO_TEST("disk-cdrom-empty", QEMUD_CMD_FLAG_DRIVE); + DO_TEST("disk-floppy", 0); + DO_TEST("disk-many", 0); + DO_TEST("disk-virtio", QEMUD_CMD_FLAG_DRIVE | + QEMUD_CMD_FLAG_DRIVE_BOOT); + DO_TEST("disk-xenvbd", QEMUD_CMD_FLAG_DRIVE | + QEMUD_CMD_FLAG_DRIVE_BOOT); + DO_TEST("disk-drive-boot-disk", QEMUD_CMD_FLAG_DRIVE | + QEMUD_CMD_FLAG_DRIVE_BOOT); + DO_TEST("disk-drive-boot-cdrom", QEMUD_CMD_FLAG_DRIVE | + QEMUD_CMD_FLAG_DRIVE_BOOT); + DO_TEST("disk-drive-fmt-qcow", QEMUD_CMD_FLAG_DRIVE | + QEMUD_CMD_FLAG_DRIVE_BOOT); + /* Can't roundtrip shareable+cache mode option */ + /*DO_TEST("disk-drive-shared", QEMUD_CMD_FLAG_DRIVE);*/ + /* Can't roundtrip v1 writethrough option */ + /*DO_TEST("disk-drive-cache-v1-wt", QEMUD_CMD_FLAG_DRIVE);*/ + DO_TEST("disk-drive-cache-v1-wb", QEMUD_CMD_FLAG_DRIVE); + DO_TEST("disk-drive-cache-v1-none", QEMUD_CMD_FLAG_DRIVE); + DO_TEST("disk-drive-cache-v2-wt", QEMUD_CMD_FLAG_DRIVE | + QEMUD_CMD_FLAG_DRIVE_CACHE_V2); + DO_TEST("disk-drive-cache-v2-wb", QEMUD_CMD_FLAG_DRIVE | + QEMUD_CMD_FLAG_DRIVE_CACHE_V2); + DO_TEST("disk-drive-cache-v2-none", QEMUD_CMD_FLAG_DRIVE | + QEMUD_CMD_FLAG_DRIVE_CACHE_V2); + DO_TEST("disk-usb", 0); + DO_TEST("graphics-vnc", 0); + + driver.vncSASL = 1; + driver.vncSASLdir = strdup("/root/.sasl2"); + DO_TEST("graphics-vnc-sasl", 0); + driver.vncTLS = 1; + driver.vncTLSx509verify = 1; + driver.vncTLSx509certdir = strdup("/etc/pki/tls/qemu"); + DO_TEST("graphics-vnc-tls", 0); + driver.vncSASL = driver.vncTLSx509verify = driver.vncTLS = 0; + free(driver.vncSASLdir); + free(driver.vncTLSx509certdir); + driver.vncSASLdir = driver.vncTLSx509certdir = NULL; + + DO_TEST("graphics-sdl", 0); + DO_TEST("graphics-sdl-fullscreen", 0); + DO_TEST("input-usbmouse", 0); + DO_TEST("input-usbtablet", 0); + /* Can't rountrip xenner arch */ + /*DO_TEST("input-xen", 0);*/ + DO_TEST("misc-acpi", 0); + DO_TEST("misc-no-reboot", 0); + DO_TEST("misc-uuid", QEMUD_CMD_FLAG_NAME | + QEMUD_CMD_FLAG_UUID | QEMUD_CMD_FLAG_DOMID); + DO_TEST("net-user", 0); + DO_TEST("net-virtio", 0); + DO_TEST("net-eth", 0); + DO_TEST("net-eth-ifname", 0); + + DO_TEST("serial-vc", 0); + DO_TEST("serial-pty", 0); + DO_TEST("serial-dev", 0); + DO_TEST("serial-file", 0); + DO_TEST("serial-unix", 0); + DO_TEST("serial-tcp", 0); + DO_TEST("serial-udp", 0); + DO_TEST("serial-tcp-telnet", 0); + DO_TEST("serial-many", 0); + DO_TEST("parallel-tcp", 0); + DO_TEST("console-compat", 0); + DO_TEST("sound", 0); + + DO_TEST("hostdev-usb-product", 0); + DO_TEST("hostdev-usb-address", 0); + + DO_TEST("hostdev-pci-address", 0); + + DO_TEST_FULL("restore-v1", QEMUD_CMD_FLAG_MIGRATE_KVM_STDIO, "stdio"); + DO_TEST_FULL("restore-v2", QEMUD_CMD_FLAG_MIGRATE_QEMU_EXEC, "stdio"); + DO_TEST_FULL("restore-v2", QEMUD_CMD_FLAG_MIGRATE_QEMU_EXEC, "exec:cat"); + DO_TEST_FULL("migrate", QEMUD_CMD_FLAG_MIGRATE_QEMU_TCP, "tcp:10.0.0.1:5000"); + + virCapabilitiesFree(driver.caps); + + return(ret==0 ? EXIT_SUCCESS : EXIT_FAILURE); +} + +VIRT_TEST_MAIN(mymain) + +#else + +int main (void) { return (77); /* means 'test skipped' for automake */ } + +#endif /* WITH_QEMU */ diff -r 453b896e0e3f tests/qemuxml2argvdata/qemuxml2argv-bootloader.args --- a/tests/qemuxml2argvdata/qemuxml2argv-bootloader.args Tue May 19 18:43:32 2009 +0100 +++ b/tests/qemuxml2argvdata/qemuxml2argv-bootloader.args Tue May 19 18:43:50 2009 +0100 @@ -1,1 +1,1 @@ -LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test /usr/bin/qemu-kvm -S -M xenner -m 214 -smp 1 -nographic -monitor pty -no-acpi -bootloader /usr/bin/pygrub -cdrom /dev/cdrom -net none -serial none -parallel none -usb +LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test /usr/bin/xenner -S -M xenner -m 214 -smp 1 -nographic -monitor pty -no-acpi -bootloader /usr/bin/pygrub -cdrom /dev/cdrom -net none -serial none -parallel none -usb diff -r 453b896e0e3f tests/qemuxml2argvdata/qemuxml2argv-bootloader.xml --- a/tests/qemuxml2argvdata/qemuxml2argv-bootloader.xml Tue May 19 18:43:32 2009 +0100 +++ b/tests/qemuxml2argvdata/qemuxml2argv-bootloader.xml Tue May 19 18:43:50 2009 +0100 @@ -13,7 +13,7 @@ <on_reboot>restart</on_reboot> <on_crash>destroy</on_crash> <devices> - <emulator>/usr/bin/qemu-kvm</emulator> + <emulator>/usr/bin/xenner</emulator> <disk type='block' device='cdrom'> <source dev='/dev/cdrom'/> <target dev='hdc' bus='ide'/> diff -r 453b896e0e3f tests/qemuxml2argvdata/qemuxml2argv-disk-cdrom-empty.xml --- a/tests/qemuxml2argvdata/qemuxml2argv-disk-cdrom-empty.xml Tue May 19 18:43:32 2009 +0100 +++ b/tests/qemuxml2argvdata/qemuxml2argv-disk-cdrom-empty.xml Tue May 19 18:43:50 2009 +0100 @@ -24,4 +24,3 @@ </disk> </devices> </domain> - diff -r 453b896e0e3f tests/qemuxml2argvdata/qemuxml2argv-hostdev-pci-address.xml --- a/tests/qemuxml2argvdata/qemuxml2argv-hostdev-pci-address.xml Tue May 19 18:43:32 2009 +0100 +++ b/tests/qemuxml2argvdata/qemuxml2argv-hostdev-pci-address.xml Tue May 19 18:43:50 2009 +0100 @@ -18,7 +18,7 @@ <source dev='/dev/HostVG/QEMUGuest2'/> <target dev='hda' bus='ide'/> </disk> - <hostdev mode='subsystem' type='pci' managed='no'> + <hostdev mode='subsystem' type='pci' managed='yes'> <source> <address domain='0x0000' bus='0x06' slot='0x12' function='0x5'/> </source> diff -r 453b896e0e3f tests/testutils.c --- a/tests/testutils.c Tue May 19 18:43:32 2009 +0100 +++ b/tests/testutils.c Tue May 19 18:43:50 2009 +0100 @@ -18,6 +18,7 @@ #ifndef WIN32 #include <sys/wait.h> #endif +#include <regex.h> #include <unistd.h> #include <string.h> #include <fcntl.h> @@ -457,3 +458,48 @@ cleanup: virResetLastError(); return ret; } + + +int virtTestClearLineRegex(const char *pattern, + char *str) +{ + regex_t reg; + char *lineStart = str; + char *lineEnd = strchr(str, '\n'); + + if (regcomp(&reg, pattern, REG_EXTENDED | REG_NOSUB) != 0) + return -1; + + while (lineStart) { + int ret; + if (lineEnd) + *lineEnd = '\0'; + + + ret = regexec(&reg, lineStart, 0, NULL, 0); + //fprintf(stderr, "Match %d '%s' '%s'\n", ret, lineStart, pattern); + if (ret == 0) { + if (lineEnd) { + memmove(lineStart, lineEnd + 1, strlen(lineEnd+1) + 1); + /* Don't update lineStart - just iterate again on this + location */ + lineEnd = strchr(lineStart, '\n'); + } else { + *lineStart = '\0'; + lineStart = NULL; + } + } else { + if (lineEnd) { + *lineEnd = '\n'; + lineStart = lineEnd + 1; + lineEnd = strchr(lineStart, '\n'); + } else { + lineStart = NULL; + } + } + } + + regfree(&reg); + + return 0; +} diff -r 453b896e0e3f tests/testutils.h --- a/tests/testutils.h Tue May 19 18:43:32 2009 +0100 +++ b/tests/testutils.h Tue May 19 18:43:50 2009 +0100 @@ -27,6 +27,8 @@ int virtTestCaptureProgramOutput(const c char **buf, int buflen); +int virtTestClearLineRegex(const char *pattern, + char *string); int virtTestDifference(FILE *stream, const char *expect, -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|

2 1

[libvirt] kvm migration
by Łukasz Mierzwa 20 May '09

20 May '09

Hi, can someone explain me how migration works in libvirt? I got 2 machines with ubuntu 9.04 (libvirt 0.6.1 and kvm 84), disk images are stored on nfs share so both machines can access them. When I run live migration (virsh migrate --live domain uri) my domain is migrated to second host but: 1. domain is defined on both hosts after migration, it does not disappear from original host 2. when I shutdown this domain on second host it gets undefined so I guess that migration is only temporary but this is not what I want. When I migrate domain to other host I want it to stay there, how can I do that? I can't find anything about it in documentation on libvirt website, google does not seem to know anything either. Łukasz Mierzwa

3 5

[libvirt] [RFC][PATCH] lxc: fix for ns cgroups subsystem
by Ryota Ozaki 20 May '09

20 May '09

Hi, lxc does not work if ns cgroups subsystem is enabled because of two factors; one is that ns has a special rule to create a group[*] unlike other subsystems and the other is lxc controller creates a new namespace for /dev/pts prior to create a new group for a domain. Unfortunately the new namespace breaks the rule of ns and that prevents a lxc controller from creating a new group. This patch addresses the problem by creating a new group before creating a new namespace (i.e. call unshare syscall). Note that this patch is only for the case ns is enabled and current code works well if it disabled. However, I think this patch makes sense because not just a few users know much about cgroups and likely to enable all of subsystems without notions (i.e. mount cgroups without any options). [*] http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=k… Thanks, ozaki-r Signed-off-by: Ryota Ozaki <ozaki.ryota(a)gmail.com> >From 46531182708dc3eb132b14ce2f23fbc639430176 Mon Sep 17 00:00:00 2001 From: Ryota Ozaki <ozaki.ryota(a)gmail.com> Date: Fri, 8 May 2009 05:31:03 +0900 Subject: [PATCH] lxc: fix for ns cgroups subsystem lxc does not work if ns cgroups subsystem is enabled because of two factors; one is that ns has a special rule to create a group[*] unlike other subsystems and the other is lxc controller creates a new namespace for /dev/pts prior to create a new group for a domain. Unfortunately the new namespace breaks the rule of ns and that prevents a lxc controller from creating a new group. This patch addresses the problem by creating a new group before creating a new namespace (i.e. call unshare syscall). Note that this patch is only for the case ns is enabled and current code works well if it disabled. However, I think this patch makes sense because not just a few users know much about cgroups and likely to enable all of subsystems without notions (i.e. mount cgroups without any options). [*] http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=k… --- src/lxc_controller.c | 6 +++--- 1 files changed, 3 insertions(+), 3 deletions(-) diff --git a/src/lxc_controller.c b/src/lxc_controller.c index e0fb05d..1231817 100644 --- a/src/lxc_controller.c +++ b/src/lxc_controller.c @@ -458,6 +458,9 @@ lxcControllerRun(virDomainDefPtr def, goto cleanup; } + if (lxcSetContainerResources(def) < 0) + goto cleanup; + root = virDomainGetRootFilesystem(def); /* @@ -543,9 +546,6 @@ lxcControllerRun(virDomainDefPtr def, } - if (lxcSetContainerResources(def) < 0) - goto cleanup; - if ((container = lxcContainerStart(def, nveths, veths, -- 1.6.0.6

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[libvirt] PATCH: 0/5: API for converting domain XML to/from native config formats
by Daniel P. Berrange 20 May '09

20 May '09

This is a long overdue update to the idea I described here http://www.redhat.com/archives/libvir-list/2009-April/msg00266.html And the initial patch posted here http://www.redhat.com/archives/libvir-list/2009-April/msg00401.html Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :|

3 17

[libvirt] [PATCH] lxc: use new error code in lxcDomainUndefine
by Amy Griffis 20 May '09

20 May '09

Update lxcDomainUndefine() to use VIR_ERR_INVALID_OPERATION instead of VIR_ERR_INTERNAL_ERROR. Signed-off-by: Amy Griffis <amy.griffis(a)hp.com> diff --git a/src/lxc_driver.c b/src/lxc_driver.c index 5392af1..64c735d 100644 --- a/src/lxc_driver.c +++ b/src/lxc_driver.c @@ -329,13 +329,13 @@ static int lxcDomainUndefine(virDomainPtr dom) } if (virDomainIsActive(vm)) { - lxcError(dom->conn, dom, VIR_ERR_INTERNAL_ERROR, + lxcError(dom->conn, dom, VIR_ERR_OPERATION_INVALID, "%s", _("cannot delete active domain")); goto cleanup; } if (!vm->persistent) { - lxcError(dom->conn, dom, VIR_ERR_INTERNAL_ERROR, + lxcError(dom->conn, dom, VIR_ERR_OPERATION_INVALID, "%s", _("cannot undefine transient domain")); goto cleanup; }

2 1

[libvirt] virStorageVolLookupByPath fails with "libvir: Storage error : invalid storage volume pointer in no storage vol with matching path"
by Francesco Latino 19 May '09

19 May '09

Hello, I have a running KVM virtual guest "demo1" with a defined disk at path /guests/mydisk.img. But when I run conn = virConnectOpenReadOnly(NULL); path = "/guests/mydisk.img"; virStorageVolLookupByPath(conn,path); I got the error " ibvir: Storage error : invalid storage volume pointer in no storage vol with matching path " what am I missing ? Thanks, Francesco

2 2

[libvirt] [PATCH] python: Better error reporting if 'import libvirtmod' fails
by Cole Robinson 19 May '09

19 May '09

Don't squash a possibly legitimate libvirtmod error (e.g. some from clashing libvirt.so versions) with 'Cannot import cygvirtmod' --- python/libvir.py | 8 ++++++-- 1 files changed, 6 insertions(+), 2 deletions(-) diff --git a/python/libvir.py b/python/libvir.py index 8a16dd0..3cda8dc 100644 --- a/python/libvir.py +++ b/python/libvir.py @@ -8,8 +8,12 @@ # On cygwin, the DLL is called cygvirtmod.dll try: import libvirtmod -except: - import cygvirtmod as libvirtmod +except ImportError, lib_e: + try: + import cygvirtmod as libvirtmod + except ImportError, cyg_e: + if str(cyg_e).count("No module named"): + raise lib_e import types -- 1.6.2.2

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[libvirt] [PATCH v2 0/2] FS backend VolCreateXMLFrom implementation.
by Cole Robinson 19 May '09

19 May '09

The following 2 patches implement virStorageVolCreateXMLFrom for the storage driver and the FS storage backend. Changes from v1: - Mark origvol as building in driver implementation - Make sure driver is locked when relocking pool object - Simplify sparse file detection with memcmp - Allocate read buffer on the heap. Thanks, Cole Cole Robinson (2): Storage driver implementation for CreateXMLFrom VolumeCreateXMLFrom FS storage backend implementation. src/storage_backend.h | 2 + src/storage_backend_fs.c | 247 +++++++++++++++++++++++++++++++++++++++------- src/storage_driver.c | 159 +++++++++++++++++++++++++++++- 3 files changed, 369 insertions(+), 39 deletions(-)

3 6

[libvirt] libvirt API to write sectors on a device
by Francesco Latino 19 May '09

19 May '09

Hello,***I am able to compile libvirt samples on my KVM hypervisor. (I edited and recompiled info.c code) *I am creating a sample code to read/write disk devices. With method *virDomainBlockPeek I can** read sectors from a given device attached to a KVM virtual guest.**I am not able to* find an API to write sectors on a disk: am I missing something ?Is there such method to write sectors from a given virtual disk ? Thanks,Francesco

2 2