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[PATCH v2] Improve error message in remoteGetUNIXSocket
by Martin Kletzander 02 Jan '24

02 Jan '24

By adding a link to an explanation in the kbase. Signed-off-by: Martin Kletzander <mkletzan(a)redhat.com> --- v2: - Do not print first socket path - Add a kbase article explaining the details and solutions - Add a link to said article v1: https://lists.libvirt.org/archives/list/devel@lists.libvirt.org/thread/WGEV… .../kbase/failed_connection_after_install.rst | 58 +++++++++++++++++++ docs/kbase/index.rst | 3 + docs/kbase/meson.build | 1 + src/remote/remote_sockets.c | 2 +- 4 files changed, 63 insertions(+), 1 deletion(-) create mode 100644 docs/kbase/failed_connection_after_install.rst diff --git a/docs/kbase/failed_connection_after_install.rst b/docs/kbase/failed_connection_after_install.rst new file mode 100644 index 000000000000..cea57c460e10 --- /dev/null +++ b/docs/kbase/failed_connection_after_install.rst @@ -0,0 +1,58 @@ +======================================== +Libvirt does not work after installation +======================================== + +.. contents:: + +TL;DR +===== + +Most probably you want to start a virtqemud socket: + +:: + + # systemctl start virtqemud.socket + +If you are unsure whether to do this, please read the rest of this document. + +Symptom +======= + +After installing libvirt or a virt tool that uses libvirt, commands do +not work when run as root: + +:: + + # virsh list + error: failed to connect to the hypervisor + error: Operation not supported: Cannot use direct socket mode if no URI is set. + For more information see https://libvirt.org/kbase/failed_connection_after_install.html + +Root cause +========== + +Distribution guidelines and/or configurations may discourage or prohibit +starting services as part of a package installation. And because libvirt cannot +know where you might want to connect it cannot start it on its own. + +Solution +======== + +After installing libvirt you may need to start a particular libvirt daemon on +the local machine, set a (default) URI to connect to or, alternatively, +rebooting the machine might work. + +If you are trying to connect to a remote libvirt daemon you need to specify a `connection URI <../uri.html>`__. + +If you are trying to control a local hypervisor, then the solution depends on various factors. You should know: + +- what hypervisor driver you want to connect to, whether it is ``virtqemud`` for QEMU, ``virtchd`` for Cloud Hypervisor, etc. and +- how to start a service or socket (in case of systemd) on you system. + +Example of the most common solution, trying to use QEMU/KVM on Linux with systemd as an init system, is: + +:: + + # systemctl start virtqemud.socket + +also provided on the top of the page. diff --git a/docs/kbase/index.rst b/docs/kbase/index.rst index 896ececdf258..e51b35cbfce5 100644 --- a/docs/kbase/index.rst +++ b/docs/kbase/index.rst @@ -64,6 +64,9 @@ Usage `Secure Boot <secureboot.html>`__ Enable and disable the Secure Boot feature +`Connection fail after installation <failed_connection_after_install.html>`__ + Explanation of a common issue users stumble upon after installation + Debugging --------- diff --git a/docs/kbase/meson.build b/docs/kbase/meson.build index 5b608293e27c..6d4ca90215a5 100644 --- a/docs/kbase/meson.build +++ b/docs/kbase/meson.build @@ -2,6 +2,7 @@ docs_kbase_files = [ 'backing_chains', 'debuglogs', 'domainstatecapture', + 'failed_connection_after_install', 'index', 'kvm-realtime', 'launch_security_sev', diff --git a/src/remote/remote_sockets.c b/src/remote/remote_sockets.c index 4ab3d72933e2..8d403b6f014a 100644 --- a/src/remote/remote_sockets.c +++ b/src/remote/remote_sockets.c @@ -398,7 +398,7 @@ remoteGetUNIXSocket(remoteDriverTransport transport, if (!direct_sock_name) { virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s", - _("Cannot use direct socket mode if no URI is set")); + _("Cannot use direct socket mode if no URI is set. For more information see https://libvirt.org/kbase/failed_connection_after_install.html")); return NULL; } -- 2.43.0

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[PATCH] qemu: Replace the deprecated short-formed option "unix"
by Han Han 21 Dec '23

21 Dec '23

Change to the boolean option "unix=on" Signed-off-by: Han Han <hhan(a)redhat.com> --- src/qemu/qemu_command.c | 2 +- .../graphics-spice-auto-socket-cfg.x86_64-latest.args | 2 +- .../graphics-spice-auto-socket.x86_64-latest.args | 2 +- tests/qemuxml2argvdata/graphics-spice-socket.x86_64-latest.args | 2 +- tests/qemuxml2argvdata/name-escape.x86_64-latest.args | 2 +- 5 files changed, 5 insertions(+), 5 deletions(-) diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index b45a5e4f80..bc285c0b6f 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -8204,7 +8204,7 @@ qemuBuildGraphicsSPICECommandLine(virQEMUDriverConfig *cfg, switch (glisten->type) { case VIR_DOMAIN_GRAPHICS_LISTEN_TYPE_SOCKET: - virBufferAddLit(&opt, "unix,addr="); + virBufferAddLit(&opt, "unix=on,addr="); virQEMUBuildBufferEscapeComma(&opt, glisten->socket); virBufferAddLit(&opt, ","); hasInsecure = true; diff --git a/tests/qemuxml2argvdata/graphics-spice-auto-socket-cfg.x86_64-latest.args b/tests/qemuxml2argvdata/graphics-spice-auto-socket-cfg.x86_64-latest.args index a50ca802ae..03fa8e868a 100644 --- a/tests/qemuxml2argvdata/graphics-spice-auto-socket-cfg.x86_64-latest.args +++ b/tests/qemuxml2argvdata/graphics-spice-auto-socket-cfg.x86_64-latest.args @@ -27,7 +27,7 @@ XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.config \ -boot strict=on \ -device '{"driver":"piix3-usb-uhci","id":"usb","bus":"pci.0","addr":"0x1.0x2"}' \ -audiodev '{"id":"audio1","driver":"spice"}' \ --spice unix,addr=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/spice.sock,seamless-migration=on \ +-spice unix=on,addr=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/spice.sock,seamless-migration=on \ -device '{"driver":"cirrus-vga","id":"video0","bus":"pci.0","addr":"0x2"}' \ -sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \ -msg timestamp=on diff --git a/tests/qemuxml2argvdata/graphics-spice-auto-socket.x86_64-latest.args b/tests/qemuxml2argvdata/graphics-spice-auto-socket.x86_64-latest.args index a50ca802ae..03fa8e868a 100644 --- a/tests/qemuxml2argvdata/graphics-spice-auto-socket.x86_64-latest.args +++ b/tests/qemuxml2argvdata/graphics-spice-auto-socket.x86_64-latest.args @@ -27,7 +27,7 @@ XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.config \ -boot strict=on \ -device '{"driver":"piix3-usb-uhci","id":"usb","bus":"pci.0","addr":"0x1.0x2"}' \ -audiodev '{"id":"audio1","driver":"spice"}' \ --spice unix,addr=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/spice.sock,seamless-migration=on \ +-spice unix=on,addr=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/spice.sock,seamless-migration=on \ -device '{"driver":"cirrus-vga","id":"video0","bus":"pci.0","addr":"0x2"}' \ -sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \ -msg timestamp=on diff --git a/tests/qemuxml2argvdata/graphics-spice-socket.x86_64-latest.args b/tests/qemuxml2argvdata/graphics-spice-socket.x86_64-latest.args index 634176a6c3..9c30cf6089 100644 --- a/tests/qemuxml2argvdata/graphics-spice-socket.x86_64-latest.args +++ b/tests/qemuxml2argvdata/graphics-spice-socket.x86_64-latest.args @@ -27,7 +27,7 @@ XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.config \ -boot strict=on \ -device '{"driver":"piix3-usb-uhci","id":"usb","bus":"pci.0","addr":"0x1.0x2"}' \ -audiodev '{"id":"audio1","driver":"spice"}' \ --spice unix,addr=/tmp/spice.sock,seamless-migration=on \ +-spice unix=on,addr=/tmp/spice.sock,seamless-migration=on \ -device '{"driver":"cirrus-vga","id":"video0","bus":"pci.0","addr":"0x2"}' \ -sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \ -msg timestamp=on diff --git a/tests/qemuxml2argvdata/name-escape.x86_64-latest.args b/tests/qemuxml2argvdata/name-escape.x86_64-latest.args index 096a774caa..9eec8f5a9f 100644 --- a/tests/qemuxml2argvdata/name-escape.x86_64-latest.args +++ b/tests/qemuxml2argvdata/name-escape.x86_64-latest.args @@ -41,7 +41,7 @@ XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-foo=1,bar=2/.config \ -netdev '{"type":"user","guestfwd":[{"str":"tcp:10.0.2.1:4600-chardev:charchannel0"}],"id":"channel0"}' \ -audiodev '{"id":"audio1","driver":"spice"}' \ -vnc vnc=unix:/var/lib/libvirt/qemu/domain--1-foo=1,,bar=2/vnc.sock,audiodev=audio1 \ --spice unix,addr=/var/lib/libvirt/qemu/domain--1-foo=1,,bar=2/spice.sock,gl=on,rendernode=/dev/dri/foo,,bar,seamless-migration=on \ +-spice unix=on,addr=/var/lib/libvirt/qemu/domain--1-foo=1,,bar=2/spice.sock,gl=on,rendernode=/dev/dri/foo,,bar,seamless-migration=on \ -device '{"driver":"cirrus-vga","id":"video0","bus":"pci.0","addr":"0x2"}' \ -blockdev '{"driver":"iscsi","portal":"example.foo.org:3260","target":"iqn.1992-01.com.example:my,storage","lun":1,"transport":"tcp","node-name":"libvirt-2-backend","read-only":false}' \ -device '{"driver":"scsi-generic","drive":"libvirt-2-backend","id":"hostdev0","bus":"scsi0.0","channel":0,"scsi-id":0,"lun":4}' \ -- 2.43.0

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[PATCH 0/4] Support for dirty-limit live migration
by Hyman Huang 21 Dec '23

21 Dec '23

v2: - mark the VIR_MIGRATE_DIRTY_LIMIT flag since 9.10.0 v1: The dirty-limit functionality for live migration was introduced since qemu>=8.1. In the live migration scenario, it implements the force convergence using the dirty-limit approach, which results in better reliable read performance. A straightforward dirty-limit capability for live migration is added by this patchset. Users might not care about other dirty-limit arguments like "x-vcpu-dirty-limit-period" or "vcpu-dirty-limit," thus do not expose them to Libvirt and Keep the default configurations and values in place. For more details about dirty-limit, please see the following reference: https://lore.kernel.org/qemu- devel/169024923116.19090.10825599068950039132-0(a)git.sr.ht/ Hyman Huang (4): Add VIR_MIGRATE_DIRTY_LIMIT flag qemu_migration: Implement VIR_MIGRATE_DIRTY_LIMIT flag virsh: Add support for VIR_MIGRATE_DIRTY_LIMIT flag NEWS: document support for dirty-limit live migration NEWS.rst | 8 ++++++++ docs/manpages/virsh.rst | 10 +++++++++- include/libvirt/libvirt-domain.h | 5 +++++ src/libvirt-domain.c | 8 ++++++++ src/qemu/qemu_migration.c | 8 ++++++++ src/qemu/qemu_migration.h | 1 + src/qemu/qemu_migration_params.c | 6 ++++++ src/qemu/qemu_migration_params.h | 1 + tools/virsh-domain.c | 10 ++++++++++ 9 files changed, 56 insertions(+), 1 deletion(-) -- 2.39.1

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[PATCH v2] conf: fix integer overflow in virDomainControllerDefParseXML
by Egor Makrushin 20 Dec '23

20 Dec '23

Multiplication results in integer overflow. Thus, replace it with ULLONG_MAX and change def->opts.pciopts.pcihole64size type to ULL. Update variable usage according to new type. Found by Linux Verification Center (linuxtesting.org) with SVACE. Signed-off-by: Egor Makrushin <emakrushin(a)astralinux.ru> --- v2: update variable type according to maintainer's proposal src/conf/domain_conf.c | 4 ++-- src/conf/domain_conf.h | 2 +- src/qemu/qemu_command.c | 2 +- 3 files changed, 4 insertions(+), 4 deletions(-) diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index 58a985fc5d..9f842937e6 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -8523,7 +8523,7 @@ virDomainControllerDefParseXML(virDomainXMLOption *xmlopt, unsigned long long bytes; if ((rc = virParseScaledValue("./pcihole64", NULL, ctxt, &bytes, 1024, - 1024ULL * ULONG_MAX, false)) < 0) + ULLONG_MAX, false)) < 0) return NULL; if (rc == 1) @@ -23123,7 +23123,7 @@ virDomainControllerDefFormat(virBuffer *buf, if (def->type == VIR_DOMAIN_CONTROLLER_TYPE_PCI && def->opts.pciopts.pcihole64) { - virBufferAsprintf(&childBuf, "<pcihole64 unit='KiB'>%lu</" + virBufferAsprintf(&childBuf, "<pcihole64 unit='KiB'>%llu</" "pcihole64>\n", def->opts.pciopts.pcihole64size); } diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h index 0c5e2636e1..14901b37ba 100644 --- a/src/conf/domain_conf.h +++ b/src/conf/domain_conf.h @@ -707,7 +707,7 @@ struct _virDomainVirtioSerialOpts { struct _virDomainPCIControllerOpts { bool pcihole64; - unsigned long pcihole64size; + unsigned long long pcihole64size; /* the exact controller name is in the "model" subelement, e.g.: * <controller type='pci' model='pcie-root-port'> diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index 54fb8220e8..b45a5e4f80 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -6211,7 +6211,7 @@ qemuBuildGlobalControllerCommandLine(virCommand *cmd, } virCommandAddArg(cmd, "-global"); - virCommandAddArgFormat(cmd, "%s.pci-hole64-size=%luK", hoststr, + virCommandAddArgFormat(cmd, "%s.pci-hole64-size=%lluK", hoststr, cont->opts.pciopts.pcihole64size); } } -- 2.30.2

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[PATCH 0/2] qemuxml2argvtest: Don't exec '/usr/libexec/qemu/vhost-user/test-vhost-user-gpu'
by Peter Krempa 20 Dec '23

20 Dec '23

'qemuExtVhostUserGPUPrepareDomain' breaks our design assumptions about the 'PrepareDomain' step which should not touch anything on the host. This patchset for now fixes the symptom by mocking the function and poisons virFork and virCommandRun so that this doesn't happen in the future. Proper fix will require splitting the vhost-user GPU prepare step to prepare the host-specific portion separately. Peter Krempa (2): qemuxml2argvmock: Mock qemuExtVhostUserGPUPrepareDomain qemuxml2argvmock: Poison virCommandRun and virFork from test context src/qemu/qemu_vhost_user_gpu.c | 4 ++++ src/qemu/qemu_vhost_user_gpu.h | 2 +- src/util/vircommand.h | 4 ++-- tests/qemuxml2argvmock.c | 28 ++++++++++++++++++++++++++++ 4 files changed, 35 insertions(+), 3 deletions(-) -- 2.43.0

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[PATCH] conf: Remove multiplication to avoid overflow
by Egor Makrushin 20 Dec '23

20 Dec '23

Multiplication results in integer overflow. Replace value of 6th agrument with ULLONG_MAX. Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: 04bd77a19f ("conf: Move and rename virDomainParseScaledValue()") Signed-off-by: Egor Makrushin <emakrushin(a)astralinux.ru> --- src/conf/domain_conf.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index 58a985fc5d..871fd3a874 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -8523,7 +8523,7 @@ virDomainControllerDefParseXML(virDomainXMLOption *xmlopt, unsigned long long bytes; if ((rc = virParseScaledValue("./pcihole64", NULL, ctxt, &bytes, 1024, - 1024ULL * ULONG_MAX, false)) < 0) + ULLONG_MAX, false)) < 0) return NULL; if (rc == 1) -- 2.30.2

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[libvirt PATCH] remote: DeserializeDomainDiskErrors: remove dead code
by Ján Tomko 19 Dec '23

19 Dec '23

As of commit b2d079c113a which converted this function to use g_strdup, the error label is only reached when i = 0, rendering it useless. Remove it. Fixes: https://gitlab.com/libvirt/libvirt/-/issues/572 Signed-off-by: Ján Tomko <jtomko(a)redhat.com> --- src/remote/remote_driver.c | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-) diff --git a/src/remote/remote_driver.c b/src/remote/remote_driver.c index 132d0194c6..392377deae 100644 --- a/src/remote/remote_driver.c +++ b/src/remote/remote_driver.c @@ -1641,12 +1641,11 @@ remoteDeserializeDomainDiskErrors(remote_domain_disk_error *ret_errors_val, int maxerrors) { size_t i = 0; - size_t j; if (ret_errors_len > limit || ret_errors_len > maxerrors) { virReportError(VIR_ERR_RPC, "%s", _("returned number of disk errors exceeds limit")); - goto error; + return -1; } for (i = 0; i < ret_errors_len; i++) { @@ -1655,12 +1654,6 @@ remoteDeserializeDomainDiskErrors(remote_domain_disk_error *ret_errors_val, } return 0; - - error: - for (j = 0; j < i; j++) - VIR_FREE(errors[j].disk); - - return -1; } static int -- 2.42.0

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[PATCH] apparmor: Add capabilities for PCI passthrough to virtxend profile
by Jim Fehlig 19 Dec '23

19 Dec '23

When splitting out the apparmor modular daemon profiles from the libvirtd profile, the net_admin and sys_admin capabilities were dropped from the virtxend profile. It was not known at the time that these capabilities were needed for PCI passthrough. Without the capabilities, the following messages are emitted from the audit subsystem audit: type=1400 audit(1702939277.946:63): apparmor="DENIED" \ operation="capable" class="cap" profile="virtxend" pid=3611 \ comm="rpc-virtxend" capability=21 capname="sys_admin" audit: type=1400 audit(1702940304.818:63): apparmor="DENIED" \ operation="capable" class="cap" profile="virtxend" pid=3731 \ comm="rpc-virtxend" capability=12 capname="net_admin" It appears sys_admin is needed to simply read from the PCI dev's sysfs config file. The net_admin capability is needed when setting the MAC address of an SR-IOV virtual function. Signed-off-by: Jim Fehlig <jfehlig(a)suse.com> --- src/security/apparmor/usr.sbin.virtxend.in | 2 ++ 1 file changed, 2 insertions(+) diff --git a/src/security/apparmor/usr.sbin.virtxend.in b/src/security/apparmor/usr.sbin.virtxend.in index 78a11305f5..77fedce352 100644 --- a/src/security/apparmor/usr.sbin.virtxend.in +++ b/src/security/apparmor/usr.sbin.virtxend.in @@ -5,8 +5,10 @@ profile virtxend @sbindir@/virtxend flags=(attach_disconnected) { #include <abstractions/dbus> capability kill, + capability net_admin, capability setgid, capability setuid, + capability sys_admin, capability sys_pacct, capability ipc_lock, -- 2.43.0

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Patches on libvirt patchew are outdated
by Han Han 19 Dec '23

19 Dec '23

Hi, The libvirt patchew https://patchew.org/Libvirt/ has no update for more than one month. Is it dropped? If not, please sync the patches to it~

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[vf-token 0/8] Introduce vf-token when using userspace PF
by Vivek Kashyap 18 Dec '23

18 Dec '23

The VFIO PCI ABI has been extended to require userspace PF driver to set a VF token to a known value. The VF drivers are then required to provide this token to access the VF device. The vf-token is set by the PF driver before VF drivers can access the device. The kernel provides no means to retrieve the token in use; but there is no specification describing the distribution or level of confidentiality of the token. Qemu has been extended to require the vf-token when vf device is used. An important point to note is that the vf-token is required only when both the PF and VF are used in userspace. This patch series adds support to provide the vf-token (uuid format) in the domain XML and to generate the qemu commandline including the vf-token. To support vf-token the new element will be used as follows: <hostdev mode='subsystem' type='pci' managed='yes'> <driver name='vfio'/> <source> <address domain='0x0000' bus='0x0' slot='0x00' function='0x1'> <vf-token uuid='00112233-4455-6677-8899-aabbccddeeff'/> </address> </source> <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'/> </hostdev> The generated commandline will include the following: -device {"driver":"vfio-pci","host":"0000:00:0.1", "vf-token":"00112233-4455-6677-8899-aabbccddeeff", "id":"hostdev0","bus":"pci.0","addr":"0x1"} Changes since initial RFC: 1. Added documentation 2. Added test cases and ran successful test suite after each patch commit 3. fixed spaces, coding sytle, and uuid string format 4. Used S:vftoken in virJSONValueObjectAdd instead of a conditional Vivek Kashyap (8): Define the vf-token extension for PCI device Introduce the vf-token qemu capability This patch introduces the PCI address extension flag for vf-token This patch introduces new XML parser/formatter functions for parsing the vf-token Introduce a validation function for vf-token support in qemu and generate vf-token device attribute in qemu command line Provide information about the vf-token flag Add tests for the vf-token flag to the qemuxml2argv and qemuxml2xml test suites Update news about vf-token NEWS.rst | 8 +++ docs/formatdomain.rst | 3 ++ src/conf/device_conf.c | 49 ++++++++++++++++--- src/conf/domain_addr.h | 1 + src/conf/domain_conf.c | 8 +++ src/conf/schemas/basictypes.rng | 7 +++ src/libvirt_private.syms | 1 + src/qemu/qemu_capabilities.c | 3 ++ src/qemu/qemu_capabilities.h | 1 + src/qemu/qemu_command.c | 8 +++ src/qemu/qemu_domain_address.c | 3 ++ src/qemu/qemu_validate.c | 20 ++++++++ src/util/virpci.c | 7 +++ src/util/virpci.h | 10 ++++ .../qemucapabilitiesdata/caps_8.1.0_s390x.xml | 1 + .../caps_8.1.0_x86_64.xml | 1 + .../caps_8.2.0_x86_64.xml | 1 + .../hostdev-vfio-vf-token.x86_64-latest.args | 34 +++++++++++++ .../hostdev-vfio-vf-token.xml | 22 +++++++++ tests/qemuxml2argvtest.c | 1 + .../hostdev-vfio-vf-token.x86_64-latest.xml | 40 +++++++++++++++ tests/qemuxml2xmltest.c | 1 + 22 files changed, 223 insertions(+), 7 deletions(-) create mode 100644 tests/qemuxml2argvdata/hostdev-vfio-vf-token.x86_64-latest.args create mode 100644 tests/qemuxml2argvdata/hostdev-vfio-vf-token.xml create mode 100644 tests/qemuxml2xmloutdata/hostdev-vfio-vf-token.x86_64-latest.xml -- 2.33.8

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