October 2013 - Devel - libvirt List Archives

[libvirt] [PATCH] use -w flag if supported by iptables
by Serge Hallyn 08 Nov '13

08 Nov '13

This will properly lock libvirt's usage of iptables with others (like ufw). (See https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1245322) Signed-off-by: Serge Hallyn <serge.hallyn(a)ubuntu.com> --- src/util/viriptables.c | 30 ++++++++++++++++++++++++++---- 1 file changed, 26 insertions(+), 4 deletions(-) diff --git a/src/util/viriptables.c b/src/util/viriptables.c index 16f571e..30d59b6 100644 --- a/src/util/viriptables.c +++ b/src/util/viriptables.c @@ -50,19 +50,25 @@ #include "virstring.h" #include "virutil.h" +bool iptables_supports_xlock = false; + #if HAVE_FIREWALLD static char *firewall_cmd_path = NULL; +#endif static int virIpTablesOnceInit(void) { + virCommandPtr cmd; + int status; + +#if HAVE_FIREWALLD firewall_cmd_path = virFindFileInPath("firewall-cmd"); if (!firewall_cmd_path) { VIR_INFO("firewall-cmd not found on system. " "firewalld support disabled for iptables."); } else { - virCommandPtr cmd = virCommandNew(firewall_cmd_path); - int status; + virCommandNew(firewall_cmd_path); virCommandAddArgList(cmd, "--state", NULL); if (virCommandRun(cmd, &status) < 0 || status != 0) { @@ -74,13 +80,26 @@ virIpTablesOnceInit(void) } virCommandFree(cmd); } + + if (firewall_cmd_path) + return 0; + +#endif + + cmd = virCommandNew(IPTABLES_PATH); + virCommandAddArgList(cmd, "-w", "-L", "-n", NULL); + if (virCommandRun(cmd, &status) < 0 || status != 0) { + VIR_INFO("xtables locking not supported by your iptables"); + } else { + VIR_INFO("using xtables locking for iptables"); + iptables_supports_xlock = true; + } + virCommandFree(cmd); return 0; } VIR_ONCE_GLOBAL_INIT(virIpTables) -#endif - #define VIR_FROM_THIS VIR_FROM_NONE enum { @@ -104,6 +123,9 @@ iptablesCommandNew(const char *table, const char *chain, int family, int action) if (cmd == NULL) { cmd = virCommandNew((family == AF_INET6) ? IP6TABLES_PATH : IPTABLES_PATH); + + if (iptables_supports_xlock) + virCommandAddArgList(cmd, "-w", NULL); } virCommandAddArgList(cmd, "--table", table, -- 1.8.3.2

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[libvirt] When vm's status file being left over, some persistent but inactive vms will be lost by libvirtd after libvirtd rebooting.
by Wangyufei (A) 07 Nov '13

07 Nov '13

Hello, I found a problem that: vm's status file may be left over in the path /var/run/libvirt/qemu under some situation, such as host reboot. When vm's status file is left over, some persistent but inactive vms will be lost by libvirtd after it is rebooted. And you can do as follows to reproduce the problem: 1、Create a vm and start it by the commands: virsh define vm-xml and virsh start vm-name. 2、Stop the libvirtd by the command: service libvirtd stop. 3、Kill the qemu process related to the vm, and make the vm's status file left over. 4、Start libvirtd. After starting the libvirtd service, we find that the vm has been lost by libvirtd with command"virsh list --all". What we expect is that the vm is shown with shutoff status, should we? The reason for the problem is that: During libvirtd startup, it first loads status files of vms under the path /var/run/libvirt/qemu, creates virDomainObj for each vm and adds it to driver->domains list. Then it creates a thread to connect related qemu process for each virDomainObj in the domains list.Because the qemu process has been killed, so connecting to qemu will be failed. When connecting to qemu failed, connection-thread will do the follows: 1、Check if vm->persistent is 1. 2、If vm->persistent is not 1, then qemuDomainRemoveInactive() is called to remove the virDomainObj. 3、Then the following calling sequence will occur:qemuDomainRemoveInactive() -->virDomainObjListRemove()-->virHashRemoveEntry(). Around virHashRemoveEntry(), domlist and dom will be locked and unlocked sequencely. The problem of the above steps is that vm->persistent maybe has been set to 1 by libvirtd main-thread when connection-thread calling virHashRemoveEntry() to remove the dom. That is a persistent virDomainObj is removed during libvirtd startup. Two ways can resolve the above problem: 1、expending the range of locking virDomainObj and virDomainObjList, lock the object of virDomainObj and virDomainObjList in connection-thread before checking vm->persistent. 2、checking vm->persistent again before calling virHashRemoveEntry(). Do you think it is a problem described above and which way listed above is more suitable to resolve the problem, or is there any other better idea? Any suggestions? Best Regards, -WangYufei

2 2

[libvirt] [PATCHv2 00/10] Strip libnuma functions from nodeinfo.c
by Peter Krempa 05 Nov '13

05 Nov '13

As a pre-requisite for doing unit tests for topology detection code the code in nodeinfo.c needs to be cleaned up. Peter Krempa (10): nodeinfo: Rename linuxNodeInfoCPUPopulate and export it properly numa: Introduce virNumaIsAvailable and use it instead of numa_available nodeinfo: Avoid forward declarations of static functions numa: Introduce virNumaGetMaxNode and use it instead of numa_max_node numa: Introduce virNumaGetNodeMemory and use it instead of numa_node_size64 nodeinfo: Get rid of nodeGetCellMemory numa: Replace NUMA_MAX_N_CPUS macro with virNumaGetMaxCPUs() caps: Fix function docs for virCapabilitiesAddHostNUMACell numa: Add wrapper of numa_node_to_cpus and use it nodeinfo: Remove libnuma include src/conf/capabilities.c | 1 + src/libvirt_linux.syms | 2 +- src/libvirt_private.syms | 3 + src/nodeinfo.c | 222 +++++++++++++---------------------------------- src/nodeinfo.h | 5 ++ src/util/virnuma.c | 221 +++++++++++++++++++++++++++++++++++++++++++++- src/util/virnuma.h | 11 +++ tests/nodeinfotest.c | 6 +- 8 files changed, 304 insertions(+), 167 deletions(-) -- 1.8.3.2

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[libvirt] [PATCH v2 0/5] Test our PCI device handling functions
by Michal Privoznik 05 Nov '13

05 Nov '13

The 4/5 is actually fix for a bug, Michal Privoznik (5): tests: Introduce virpcitest virpcitest: Test virPCIDeviceDetach virpcitest: Introduce testVirPCIDeviceReattach virpci: Don't error on not binded devices virpcitest: Introduce check for unbinded devices .gitignore | 1 + cfg.mk | 4 +- src/util/virpci.c | 12 +- tests/Makefile.am | 21 +- tests/virpcimock.c | 913 +++++++++++++++++++++++++++++++++++++++++++++++++++++ tests/virpcitest.c | 204 ++++++++++++ 6 files changed, 1148 insertions(+), 7 deletions(-) create mode 100644 tests/virpcimock.c create mode 100644 tests/virpcitest.c -- 1.8.1.5

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[libvirt] PATCH: pci-subsystem: ixgbe: SR-IOV: kernel way to order driver's virtfn -entries is odd causing libvirt failures.
by Niilona 05 Nov '13

05 Nov '13

Hi. As Bjorn Helgaas recommend, this might be the item to discuss in the wider area. ----------------------------------- There is a behavior effecting virtfn -entries in sysfs, when amount of them increases over 10. Run VM's through LIBVIRT -> QEMU/KVM, this causes : - MAC address setting by LIBVIRT disordered ie. setting targeted to wrong VF. - VLAN setting by LIBVIRT overall failed Basics of this are in "/libvirt-x.x.x/src/util/virpci.c" ; in function below, which don't order virtfn entries correctly. /* * Returns virtual functions of a physical function */ int virPCIGetVirtualFunctions(const char *sysfs_path, virPCIDeviceAddressPtr **virtual_functions, unsigned int *num_virtual_functions) { But I let you to decide which is best way to fix this, as if every application reads "virtfn" entries from PF's directory, they all need to sort entries in alphabet. order to avoid this influence. So personally I did get over this by adding pre-zeroes to names to have them in sorted order in PF's directory. ---------------------------- Tested : - kernel 3.8.0-21 - libvirt 1.0.2 & libvirt 1.1.3 - ixgbe 3.11.33-k, ixgbe 3.17-3 & ixgbe 3.18.7 After applying this MAC/VLAN seen to work and VM's get contacted using MAC's & VLAN's, which been checked using tcpdump. P.S. Tested with 3.8.0-21, but patch constructed against "https://github.com/torvalds/linux.git", so there is possibilty this works in latest kernel, but haven't checked it. At least ordering scheme seen in "iov.c" in same form as before. ----------------------------- >From fac886b86099dca1937730026da24c34857c4077 Mon Sep 17 00:00:00 2001 From: Niilo Minkkinen <niilo.minkkinen(a)tieto.com> Date: Wed, 23 Oct 2013 14:50:07 +0300 Subject: [PATCH 1/1] Fixes ordering of virtfn -entries on drivers with more than 10 entries ( virtfn0...virtfn9 ). This effects on drivers like Intel 82599 "ixgbe", which have max 31 VF's (Virtual Function) on one PF (Physical Function). Currently, ordering is "diffused", which in case causes MAC/VLAN -settings on libvirt based to PCI -addressing failed. Signed-off-by: Niilo Minkkinen <niilo.minkkinen(a)tieto.com> Signed-off-by: Tommy Varre <tommy.varre(a)tieto.com> --- drivers/pci/iov.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c index 21a7182..fbd1209 100644 --- a/drivers/pci/iov.c +++ b/drivers/pci/iov.c @@ -106,7 +106,7 @@ static int virtfn_add(struct pci_dev *dev, int id, int reset) mutex_unlock(&iov->dev->sriov->lock); rc = pci_bus_add_device(virtfn); - sprintf(buf, "virtfn%u", id); + sprintf(buf, "virtfn%02u", id); rc = sysfs_create_link(&dev->dev.kobj, &virtfn->dev.kobj, buf); if (rc) goto failed1; @@ -149,7 +149,7 @@ static void virtfn_remove(struct pci_dev *dev, int id, int reset) __pci_reset_function(virtfn); } - sprintf(buf, "virtfn%u", id); + sprintf(buf, "virtfn%02u", id); sysfs_remove_link(&dev->dev.kobj, buf); /* * pci_stop_dev() could have been called for this virtfn already, -- 1.8.1.2 ----------------------------- What you think ? Niilo Minkkinen niilo.minkkinen(a)tieto.com

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[libvirt] [PATCH v3] qemu: don't use deprecated -no-kvm-pit-reinjection
by Ján Tomko 05 Nov '13

05 Nov '13

Since qemu-kvm 1.1 [1] (since 1.3. in upstream QEMU [2]) '-no-kvm-pit-reinjection' has been deprecated. Use -global kvm-pit.lost_tick_policy=discard instead. https://bugzilla.redhat.com/show_bug.cgi?id=978719 [1] http://git.kernel.org/cgit/virt/kvm/qemu-kvm.git/commit/?id=4e4fa39 [2] http://git.qemu.org/?p=qemu.git;a=commitdiff;h=c21fb4f --- v3: use -global instead of trying to add another -device re: https://www.redhat.com/archives/libvir-list/2013-July/msg00833.html Unsetting the QEMU_CAPS_NO_KVM_PIT capability for QEMU >1.2 seems to work okay with libvirtd upgrades. v2: https://www.redhat.com/archives/libvir-list/2013-July/msg00821.html v1: https://www.redhat.com/archives/libvir-list/2013-July/msg00045.html src/qemu/qemu_capabilities.c | 5 ++-- src/qemu/qemu_capabilities.h | 1 + src/qemu/qemu_command.c | 8 ++++-- .../qemuxml2argv-kvm-pit-delay.args | 5 ++++ .../qemuxml2argv-kvm-pit-delay.xml | 29 ++++++++++++++++++++++ .../qemuxml2argv-kvm-pit-device.args | 5 ++++ .../qemuxml2argv-kvm-pit-device.xml | 29 ++++++++++++++++++++++ tests/qemuxml2argvtest.c | 4 +++ 8 files changed, 82 insertions(+), 4 deletions(-) create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-kvm-pit-delay.args create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-kvm-pit-delay.xml create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-kvm-pit-device.args create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-kvm-pit-device.xml diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c index dc8f0be..06b71b5 100644 --- a/src/qemu/qemu_capabilities.c +++ b/src/qemu/qemu_capabilities.c @@ -242,6 +242,7 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST, "usb-storage.removable", "virtio-mmio", "ich9-intel-hda", + "kvm-pit", ); struct _virQEMUCaps { @@ -1393,6 +1394,7 @@ struct virQEMUCapsStringFlags virQEMUCapsObjectTypes[] = { { "usb-storage", QEMU_CAPS_DEVICE_USB_STORAGE }, { "virtio-mmio", QEMU_CAPS_DEVICE_VIRTIO_MMIO }, { "ich9-intel-hda", QEMU_CAPS_DEVICE_ICH9_INTEL_HDA }, + { "kvm-pit", QEMU_CAPS_DEVICE_KVM_PIT }, }; static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsVirtioBlk[] = { @@ -2477,13 +2479,12 @@ virQEMUCapsInitArchQMPBasic(virQEMUCapsPtr qemuCaps, /* * Currently only x86_64 and i686 support PCI-multibus, - * -no-acpi and -no-kvm-pit-reinjection. + * -no-acpi */ if (qemuCaps->arch == VIR_ARCH_X86_64 || qemuCaps->arch == VIR_ARCH_I686) { virQEMUCapsSet(qemuCaps, QEMU_CAPS_PCI_MULTIBUS); virQEMUCapsSet(qemuCaps, QEMU_CAPS_NO_ACPI); - virQEMUCapsSet(qemuCaps, QEMU_CAPS_NO_KVM_PIT); } ret = 0; diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h index f8dc728..770744e 100644 --- a/src/qemu/qemu_capabilities.h +++ b/src/qemu/qemu_capabilities.h @@ -197,6 +197,7 @@ enum virQEMUCapsFlags { QEMU_CAPS_USB_STORAGE_REMOVABLE = 156, /* usb-storage.removable */ QEMU_CAPS_DEVICE_VIRTIO_MMIO = 157, /* -device virtio-mmio */ QEMU_CAPS_DEVICE_ICH9_INTEL_HDA = 158, /* -device ich9-intel-hda */ + QEMU_CAPS_DEVICE_KVM_PIT = 159, /* -device kvm-pit */ QEMU_CAPS_LAST, /* this must always be the last item */ }; diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index ba102f4..c988646 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -7966,11 +7966,15 @@ qemuBuildCommandLine(virConnectPtr conn, case VIR_DOMAIN_TIMER_TICKPOLICY_DELAY: /* delay is the default if we don't have kernel (-no-kvm-pit), otherwise, the default is catchup. */ - if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_NO_KVM_PIT)) + if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_KVM_PIT)) + virCommandAddArgList(cmd, "-global", + "kvm-pit.lost_tick_policy=discard", NULL); + else if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_NO_KVM_PIT)) virCommandAddArg(cmd, "-no-kvm-pit-reinjection"); break; case VIR_DOMAIN_TIMER_TICKPOLICY_CATCHUP: - if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_NO_KVM_PIT)) { + if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_NO_KVM_PIT) || + virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_KVM_PIT)) { /* do nothing - this is default for kvm-pit */ } else if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_TDF)) { /* -tdf switches to 'catchup' with userspace pit. */ diff --git a/tests/qemuxml2argvdata/qemuxml2argv-kvm-pit-delay.args b/tests/qemuxml2argvdata/qemuxml2argv-kvm-pit-delay.args new file mode 100644 index 0000000..ca5823f --- /dev/null +++ b/tests/qemuxml2argvdata/qemuxml2argv-kvm-pit-delay.args @@ -0,0 +1,5 @@ +LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=none \ +/usr/bin/qemu -S -M pc -m 214 -smp 2 -nographic \ +-monitor unix:/tmp/test-monitor,server,nowait \ +-no-kvm-pit-reinjection -no-acpi -boot c -usb -hda /dev/HostVG/QEMUGuest1 \ +-net none -serial none -parallel none diff --git a/tests/qemuxml2argvdata/qemuxml2argv-kvm-pit-delay.xml b/tests/qemuxml2argvdata/qemuxml2argv-kvm-pit-delay.xml new file mode 100644 index 0000000..7835a1b --- /dev/null +++ b/tests/qemuxml2argvdata/qemuxml2argv-kvm-pit-delay.xml @@ -0,0 +1,29 @@ +<domain type='qemu'> + <name>QEMUGuest1</name> + <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid> + <memory unit='KiB'>219136</memory> + <currentMemory unit='KiB'>219136</currentMemory> + <vcpu placement='static'>2</vcpu> + <os> + <type arch='i686' machine='pc'>hvm</type> + <boot dev='hd'/> + </os> + <clock offset='utc'> + <timer name='pit' tickpolicy='delay'/> + </clock> + <on_poweroff>destroy</on_poweroff> + <on_reboot>restart</on_reboot> + <on_crash>destroy</on_crash> + <devices> + <emulator>/usr/bin/qemu</emulator> + <disk type='block' device='disk'> + <source dev='/dev/HostVG/QEMUGuest1'/> + <target dev='hda' bus='ide'/> + <address type='drive' controller='0' bus='0' target='0' unit='0'/> + </disk> + <controller type='usb' index='0'/> + <controller type='ide' index='0'/> + <controller type='pci' index='0' model='pci-root'/> + <memballoon model='virtio'/> + </devices> +</domain> diff --git a/tests/qemuxml2argvdata/qemuxml2argv-kvm-pit-device.args b/tests/qemuxml2argvdata/qemuxml2argv-kvm-pit-device.args new file mode 100644 index 0000000..f03840f --- /dev/null +++ b/tests/qemuxml2argvdata/qemuxml2argv-kvm-pit-device.args @@ -0,0 +1,5 @@ +LC_ALL=C PATH=/bin HOME=/home/test USER=test LOGNAME=test QEMU_AUDIO_DRV=none \ +/usr/bin/qemu -S -M pc -m 214 -smp 2 -nographic \ +-monitor unix:/tmp/test-monitor,server,nowait \ +-global kvm-pit.lost_tick_policy=discard -no-acpi -boot c -usb \ +-hda /dev/HostVG/QEMUGuest1 -net none -serial none -parallel none diff --git a/tests/qemuxml2argvdata/qemuxml2argv-kvm-pit-device.xml b/tests/qemuxml2argvdata/qemuxml2argv-kvm-pit-device.xml new file mode 100644 index 0000000..7835a1b --- /dev/null +++ b/tests/qemuxml2argvdata/qemuxml2argv-kvm-pit-device.xml @@ -0,0 +1,29 @@ +<domain type='qemu'> + <name>QEMUGuest1</name> + <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid> + <memory unit='KiB'>219136</memory> + <currentMemory unit='KiB'>219136</currentMemory> + <vcpu placement='static'>2</vcpu> + <os> + <type arch='i686' machine='pc'>hvm</type> + <boot dev='hd'/> + </os> + <clock offset='utc'> + <timer name='pit' tickpolicy='delay'/> + </clock> + <on_poweroff>destroy</on_poweroff> + <on_reboot>restart</on_reboot> + <on_crash>destroy</on_crash> + <devices> + <emulator>/usr/bin/qemu</emulator> + <disk type='block' device='disk'> + <source dev='/dev/HostVG/QEMUGuest1'/> + <target dev='hda' bus='ide'/> + <address type='drive' controller='0' bus='0' target='0' unit='0'/> + </disk> + <controller type='usb' index='0'/> + <controller type='ide' index='0'/> + <controller type='pci' index='0' model='pci-root'/> + <memballoon model='virtio'/> + </devices> +</domain> diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c index 0b808a4..58eb3e9 100644 --- a/tests/qemuxml2argvtest.c +++ b/tests/qemuxml2argvtest.c @@ -1080,6 +1080,10 @@ mymain(void) QEMU_CAPS_DRIVE, QEMU_CAPS_DEVICE_VIRTIO_MMIO, QEMU_CAPS_DEVICE_VIRTIO_RNG, QEMU_CAPS_OBJECT_RNG_RANDOM); + DO_TEST("kvm-pit-device", QEMU_CAPS_DEVICE_KVM_PIT); + DO_TEST("kvm-pit-delay", QEMU_CAPS_NO_KVM_PIT); + DO_TEST("kvm-pit-device", QEMU_CAPS_NO_KVM_PIT, QEMU_CAPS_DEVICE_KVM_PIT); + virObjectUnref(driver.config); virObjectUnref(driver.caps); virObjectUnref(driver.xmlopt); -- 1.8.1.5

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[libvirt] [PATCHv2 0/8] Introduce paravirtual spinlock support
by Peter Krempa 04 Nov '13

04 Nov '13

Version 2 fixes stuff pointed out in Dan's review Jiri Denemark (2): cpu: Export few x86-specific APIs qemu: Add monitor APIs to fetch CPUID data from QEMU Peter Krempa (6): cpu_x86: Refactor storage of CPUID data to add support for KVM features cpu: x86: Parse the CPU feature map only once cpu: x86: Add internal CPUID features support and KVM feature bits conf: Refactor storing and usage of feature flags qemu: Add support for paravirtual spinlocks in the guest qemu: process: Validate specific CPUID flags of a guest docs/formatdomain.html.in | 8 + docs/schemas/domaincommon.rng | 10 +- src/conf/domain_conf.c | 195 +++++++++--- src/conf/domain_conf.h | 3 +- src/cpu/cpu_x86.c | 350 +++++++++++---------- src/cpu/cpu_x86.h | 9 + src/cpu/cpu_x86_data.h | 20 +- src/libvirt_private.syms | 6 + src/libxl/libxl_conf.c | 9 +- src/lxc/lxc_container.c | 6 +- src/qemu/qemu_command.c | 28 +- src/qemu/qemu_monitor.c | 35 +++ src/qemu/qemu_monitor.h | 5 + src/qemu/qemu_monitor_json.c | 145 +++++++++ src/qemu/qemu_monitor_json.h | 2 + src/qemu/qemu_process.c | 53 ++++ src/vbox/vbox_tmpl.c | 45 ++- src/xenapi/xenapi_driver.c | 10 +- src/xenapi/xenapi_utils.c | 22 +- src/xenxs/xen_sxpr.c | 20 +- src/xenxs/xen_xm.c | 30 +- tests/Makefile.am | 1 + .../qemumonitorjson-getcpu-full.data | 5 + .../qemumonitorjson-getcpu-full.json | 46 +++ .../qemumonitorjson-getcpu-host.data | 6 + .../qemumonitorjson-getcpu-host.json | 45 +++ tests/qemumonitorjsontest.c | 76 +++++ .../qemuxml2argv-pv-spinlock-disabled.args | 5 + .../qemuxml2argv-pv-spinlock-disabled.xml | 26 ++ .../qemuxml2argv-pv-spinlock-enabled.args | 5 + .../qemuxml2argv-pv-spinlock-enabled.xml | 26 ++ tests/qemuxml2argvtest.c | 2 + tests/qemuxml2xmltest.c | 2 + 33 files changed, 952 insertions(+), 304 deletions(-) create mode 100644 tests/qemumonitorjsondata/qemumonitorjson-getcpu-full.data create mode 100644 tests/qemumonitorjsondata/qemumonitorjson-getcpu-full.json create mode 100644 tests/qemumonitorjsondata/qemumonitorjson-getcpu-host.data create mode 100644 tests/qemumonitorjsondata/qemumonitorjson-getcpu-host.json create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-pv-spinlock-disabled.args create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-pv-spinlock-disabled.xml create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-pv-spinlock-enabled.args create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-pv-spinlock-enabled.xml -- 1.8.3.2

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[libvirt] [RFC] net-dhcp-leases: Query: Reg: Leases API Script
by Nehal J Wani 04 Nov '13

04 Nov '13

Q1. The --dhcp-script option will require libvirt to provide a script or executable file to be run. Now as the man page says, this file is executed "Whenever a new DHCP ease is created, or an old one destroyed". Life was easy with the script, as it used the command sed to remove the destroyed lease. eblake had suggested me to use a C program instead. So I wanted to finalize whether to go with C or continue with shell script. Q2. The above executable file will be writing the custom formatted lease parameters to a file "dnsmasq-ip-mac.status" (suggestion open for name). This newly created/updated file will be parsed by the API. We need to decide the format for the file. Do we continue with space separated parameters as before? Q3. What should be the location of the above two files? Is there any example that I can follow in libvirt for deploying custom-script files/C programs which are not to be linked? Script is attached. -- Nehal J Wani

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[libvirt] pvpanic plans?
by Paolo Bonzini 04 Nov '13

04 Nov '13

The thread from yesterday has died off (perhaps also because of my inappropriate answer to Michael, for which I apologize to him and everyone). I took some time to discuss the libvirt requirements further with Daniel Berrange and Eric Blake on IRC. If anyone is interested, I can give logs. This is a suggestion for how to proceed in both QEMU and libvirt. == Builtin pvpanic == QEMU will remove pvpanic from pc-1.5 in 1.6.1 and 1.5.4. This does not break migration. == Support in libvirt for current functionality == libvirt will add a <panic-notifier/> element, and possibly a capability for it accessible via "virsh capabilities". There are two possibilities: 1) On QEMU 1.5.4/1.6.1 and newer (and on QEMU 1.6.0 with a machine type other than pc-1.5), <on_crash> will only work if the element is there. On QEMU 1.5.0->1.5.3, and on QEMU 1.6.0 with the pc-1.5 machine type, <on_crash> will be obeyed always, and may override e.g. reboot-on-panic if a guest driver exist. 2) On all versions, <on_crash> will only work if the element is there. In turn, there are two ways to implement (2): 2a) libvirt will always add -global pvpanic.iobase=0 to neutralize the builtin pvpanic device if present. <panic-notifier/> will create the device with -device pvpanic,iobase=0x505 Advantage: no changes to QEMU Disadvantage 1: writes to port 0 with QEMU 1.{5.0,5.1,5.2,5.3,6.0} and pc-1.5 machine type will write to a pvpanic device instead of the DMA controller. Probably harmless, and limited to some QEMU versions. Disadvantage 2: libvirt has knowledge of the pvpanic port number 2b) QEMU will provide a way for libvirt to detect that no machine type has the builtin pvpanic. If some machine type may have the builtin pvpanic, and <panic-notifier/> is absent, libvirt will add "-global pvpanic.iobase=0" to neutralize it. Otherwise, libvirt will create the device normally. A possible way for libvirt to detect "good" machine types is a dummy property. This is a bit ugly in that the property would not affect the behavior of the device. The property would remain in the long term. Another possibility is for QEMU to rename the device, e.g. to isa-pvpanic. This is also somewhat gross, but not visible in the long term when the "pvpanic" name will be lost in history. Advantage 1: libvirt has no knowledge of the pvpanic port number Disadvantage 1: same as above Disadvantage 2: need a somewhat gross change in QEMU This method also provides an (also somewhat gross on the QEMU side) way to detect other changes in the pvpanic semantics. One example mentioned below, is making the panicked state temporary. == Possible improvements to pvpanic == The current implementation of pvpanic supports three modes: reset system on panic, destroy domain on panic, preserve domain with no possibility to resume it. (Optionally a domain can be dumped too). Long term, the choice to include pvpanic should not be on the guest admin's shoulders, but rather in libosinfo. Thus, it would be nice to have a fourth mode where the panic is logged but the guest otherwise keeps running. This mode would let libosinfo add pvpanic by default without affecting the guest's behavior on panic. With this change, <on_crash>ignore</on_crash> will behave as follows for the three possibilities above: (1) With QEMU 1.5.0 to 1.6.1, <on_crash> will _not_ obey the setting, never (even if no <panic-notifier/> is specified). libvirt will have to pick a fallback action. advantage of destroy as fallback: it is the default (but note that restart is the default for virt-install) advantage of preserve as fallback: lets the admin examine the panic advantage of restart as fallback: maximum availability of the VM, it is the default for virt-install (2a) With QEMU 1.5.0 to 1.6.1, <on_crash> will _not_ obey the setting if <panic-notifier/> is specified. libvirt has _no way_ to learn about this, so the capability would always be present with these QEMU versions and libosinfo would always add <panic-notifier/> with these versions. Given the libosinfo scenario being considered here, this is not very different from (1). (2b) With QEMU 1.5.0 to 1.6.1, the <panic-notifier/> element will not be available and not exposed in libvirt capabilities. Thus with this version libosinfo would omit <panic-notifier/> from the XML. Guest policy will always be followed correctly. The problem in both (1) and (2a) can be summarized as follows. First, libvirt will have to implement and document a fallback action for buggy QEMU. Second, even though the problems would be limited to some version of QEMU, they would be relatively hard to debug for a casual user, could start happening randomly by updating any one of QEMU, libvirt, libosinfo or the guest kernel, and there is no fallback action for libvirt that is always correct. Thus, considering future libosinfo support for pvpanic, (2b) is preferrable in my opinion. Now, making pvpanic reversible requires a change in QEMU (patch already posted). Andreas proposed using a pvpanic property to determine whether the panicked state is temporary or definitive. libvirt could piggyback on such a property to detect the "goodness" of machine types (as mentioned regarding solution 2b above). However: First, this would require a more intrusive patch, less appealing for 1.5 and 1.6 stable branches. Second, there is no reason why libvirt would want to make the panicked state definitive. To achieve the same effect, libvirt can just not issue the "continue" monitor command when the guest is panicked. Thus the new property would be useless except to communicate pvpanic behavior---and renaming the device still seems preferrable to me. Thanks for reading up to here! Paolo

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Re: [libvirt] Libvirt support of mac-programming over macvtap planned?
by Amos Kong 04 Nov '13

04 Nov '13

On Tue, Oct 29, 2013 at 09:50:56AM -0400, Matthew Rosato wrote: > Amos Kong provided QEMU support to facilitate macvtap rx-filter change > notification here: > http://lists.nongnu.org/archive/html/qemu-devel/2013-07/msg02736.html > > Libvirt work was mentioned, but I haven't noticed any activity here > regarding exploitation -- Is someone working this or planning to in the > near future? Don't want to duplicate effort. Anything that I can do to > help? We have an redhat internal bug to track it: https://bugzilla.redhat.com/show_bug.cgi?id=848199 CC Laine > Thanks, > Matt -- Amos.

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