April 2022 - Devel - libvirt List Archives

[libvirt RFC v2 00/11] multifd save prototype
by Claudio Fontana 22 Apr '22

22 Apr '22

This is the multifd save prototype in its first semi-functional state, (save direction only), with surely a lot of rough edges as I am not very familiar with the libvirt code base yet or its rules. It seems to work for me, but take a look if this is something realistic to pursue further, whether this could be acceptable for libvirt. Claudio Fontana (11): libvirt: introduce virDomainSaveParametersFlags public API remote: Add RPC support for the virDomainSaveParametersFlags API qemu: add a stub for virDomainSaveParametersFlags API qemu: initial implementation for the virDomainSaveParametersFlags API iohelper: move runIO function to a separate module runio: add arguments to extend use beyond just stdin and stdout multifd-helper: new helper for parallel saves qemu: wire up saveimage code with the multifd helper qemu: implement qemuMigrationSrcToFilesMultiFd tools: add parallel parameter to virsh save command qemu: add migration parameter multifd-compression docs/manpages/virsh.rst | 23 ++- include/libvirt/libvirt-domain.h | 9 + src/driver-hypervisor.h | 7 + src/libvirt-domain.c | 51 ++++++ src/libvirt_private.syms | 1 + src/libvirt_public.syms | 5 + src/qemu/qemu_capabilities.c | 3 + src/qemu/qemu_capabilities.h | 1 + src/qemu/qemu_driver.c | 66 +++++++- src/qemu/qemu_migration.c | 135 ++++++++++----- src/qemu/qemu_migration.h | 7 + src/qemu/qemu_migration_params.c | 71 +++++--- src/qemu/qemu_migration_params.h | 15 ++ src/qemu/qemu_saveimage.c | 281 ++++++++++++++++++++++++++----- src/qemu/qemu_saveimage.h | 9 + src/qemu/qemu_snapshot.c | 2 +- src/remote/remote_driver.c | 1 + src/remote/remote_protocol.x | 17 +- src/remote_protocol-structs | 9 + src/util/iohelper.c | 180 +------------------- src/util/meson.build | 15 ++ src/util/multifd-helper.c | 205 ++++++++++++++++++++++ src/util/runio.c | 214 +++++++++++++++++++++++ src/util/runio.h | 38 +++++ src/util/virthread.c | 5 + src/util/virthread.h | 1 + tools/virsh-domain.c | 49 +++++- 27 files changed, 1108 insertions(+), 312 deletions(-) create mode 100644 src/util/multifd-helper.c create mode 100644 src/util/runio.c create mode 100644 src/util/runio.h -- 2.34.1

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[PATCH v3 00/30] Add 'version' to other exported types
by Victor Toso 22 Apr '22

22 Apr '22

Hi, Here it comes, version 3. v1: https://listman.redhat.com/archives/libvir-list/2022-April/229881.html v2: https://listman.redhat.com/archives/libvir-list/2022-April/230097.html In this version, I have: - dropped the changes to .sym files (Peter, Daniel) - improved commit log: 'doc' -> 'docstring' (and more) (Peter) - fixed all versions prior to v1.0.0 (Peter, Andrea) - created a validate script, to confirm all is good. Not expecting it to be merged, just added to help review that the outcome is acceptable. - lots of fixes found by the script above. - dropped the concept of generated/manual in git shortlog of the series. - added an allow list for functions where there is a mismatch between version in the sym file and the git tag they were introduced (Peter) I hope that it'll be useful to other generators, besides: https://gitlab.com/libvirt/libvirt-go-module/-/merge_requests/7 Gitlab run of this series (fails with codestyle of do-not-commit script). https://gitlab.com/victortoso/libvirt/-/pipelines/520901763 Have a wonderful day, Victor Victor Toso (30): syntax-check: sc_prohibit_nonreentrant: skip comments syntax-check: prohibit_virXXXFree: skip strings docstring: Fix generated documentation of virConnectListAllNodeDeviceFlags docstring: variable: Move docstring from source to header file docstring: enums: libvirt: Add 'Since version' metadata docstring: enums: qemu: Add 'Since version' metadata docstring: enums: admin: Add 'Since version' metadata docstring: macros: libvirt: Add 'Since version' metadata docstring: macros: admin: Add 'Since version' metadata docstring: typedef: libvirt:: Add 'Since version' metadata docstring: typedef: qemu:: Add 'Since version' metadata docstring: typedef: admin:: Add 'Since version' metadata docstring: function: libvirt: Add 'Since version' metadata docstring: function: qemu: Add 'Since version' metadata docstring: function: lxc: Add 'Since version' metadata docstring: function: admin: Add 'Since version' metadata docstring: libvirt-common: Add 'Since version' metadata docstring: Fix generated documentation of virStorageVolInfoFlags docstring: Fix and append Since to virConnectListAllStoragePoolsFlags docstring: Fix and append Since to virDomainDeviceModifyFlags docstring: Fix and append Since to virDomainMemoryModFlags docstring: Fix and append Since to virDomainVcpuFlags scripts: apibuild: parse 'Since' version for enums scripts: apibuild: fix parsing block comments from typedef enum scripts: apibuild: parse 'Since' for typedefs scripts: apibuild: parse 'Since' for macros scripts: apibuild: parse 'Since' for functions scripts: apibuild: factor out comment cleaning scripts: apibuild: add parsing variable's comments do-not-commit: script to validate output build-aux/syntax-check.mk | 4 +- include/libvirt/libvirt-admin.h | 95 +- include/libvirt/libvirt-common.h.in | 54 +- include/libvirt/libvirt-domain-checkpoint.h | 62 +- include/libvirt/libvirt-domain-snapshot.h | 100 +- include/libvirt/libvirt-domain.h | 2665 +++++++++++++++---- include/libvirt/libvirt-event.h | 35 +- include/libvirt/libvirt-host.h | 320 ++- include/libvirt/libvirt-interface.h | 33 +- include/libvirt/libvirt-network.h | 195 +- include/libvirt/libvirt-nodedev.h | 100 +- include/libvirt/libvirt-nwfilter.h | 29 +- include/libvirt/libvirt-qemu.h | 39 +- include/libvirt/libvirt-secret.h | 81 +- include/libvirt/libvirt-storage.h | 316 ++- include/libvirt/libvirt-stream.h | 48 +- include/libvirt/virterror.h | 428 +-- scripts/apibuild.py | 212 +- scripts/version-quest.py | 190 ++ src/admin/libvirt-admin.c | 93 + src/libvirt-domain-checkpoint.c | 36 + src/libvirt-domain-snapshot.c | 63 + src/libvirt-domain.c | 557 +++- src/libvirt-host.c | 102 + src/libvirt-interface.c | 63 + src/libvirt-lxc.c | 12 + src/libvirt-network.c | 135 + src/libvirt-nodedev.c | 81 + src/libvirt-nwfilter.c | 72 + src/libvirt-qemu.c | 18 + src/libvirt-secret.c | 60 + src/libvirt-storage.c | 171 ++ src/libvirt-stream.c | 51 + src/libvirt.c | 29 +- src/util/virerror.c | 45 + src/util/virevent.c | 27 + src/util/virtypedparam-public.c | 57 + 37 files changed, 5533 insertions(+), 1145 deletions(-) create mode 100644 scripts/version-quest.py -- 2.35.1

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[PATCH] nwfilter_driver: Make reload fail if racing with stateCleanup()
by Michal Privoznik 22 Apr '22

22 Apr '22

When one thread is trying to reload NWFilter driver (by running nwfilterStateReload()) but there's another thread that's concurrently running nwfilterStateCleanup() a crash may occur. This is despite nwfilterStateReload() checking for driver != NULL, because is done so without @driverMutex held. A typical TOCTOU. Fortunately, the mutex is always initialized, so the mutex can be acquired at all times and @driver can be checked with the lock held. Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2075837 Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com> --- src/nwfilter/nwfilter_driver.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/src/nwfilter/nwfilter_driver.c b/src/nwfilter/nwfilter_driver.c index b66ba22737..d028efafbe 100644 --- a/src/nwfilter/nwfilter_driver.c +++ b/src/nwfilter/nwfilter_driver.c @@ -309,6 +309,8 @@ nwfilterStateInitialize(bool privileged, static int nwfilterStateReload(void) { + VIR_LOCK_GUARD lock = virLockGuardLock(&driverMutex); + if (!driver) return -1; @@ -319,15 +321,13 @@ nwfilterStateReload(void) /* shut down all threads -- they will be restarted if necessary */ virNWFilterLearnThreadsTerminate(true); - VIR_WITH_MUTEX_LOCK_GUARD(&driverMutex) { - VIR_WITH_MUTEX_LOCK_GUARD(&driver->updateLock) { - virNWFilterObjListLoadAllConfigs(driver->nwfilters, driver->configDir); - } - - - virNWFilterBuildAll(driver, false); + VIR_WITH_MUTEX_LOCK_GUARD(&driver->updateLock) { + virNWFilterObjListLoadAllConfigs(driver->nwfilters, driver->configDir); } + + virNWFilterBuildAll(driver, false); + return 0; } -- 2.35.1

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[libvirt PATCH 0/2] include: Fix vertical spacing
by Andrea Bolognani 22 Apr '22

22 Apr '22

Andrea Bolognani (2): include: Fix vertical spacing inside comments include: Fix vertical spacing between comments and symbols include/libvirt/libvirt-common.h.in | 1 - include/libvirt/libvirt-domain-checkpoint.h | 6 - include/libvirt/libvirt-domain-snapshot.h | 7 - include/libvirt/libvirt-domain.h | 154 -------------------- include/libvirt/libvirt-event.h | 1 - include/libvirt/libvirt-host.h | 33 ----- include/libvirt/libvirt-interface.h | 5 - include/libvirt/libvirt-network.h | 17 --- include/libvirt/libvirt-nodedev.h | 7 - include/libvirt/libvirt-nwfilter.h | 6 - include/libvirt/libvirt-secret.h | 7 - include/libvirt/libvirt-storage.h | 25 ---- include/libvirt/libvirt-stream.h | 3 - include/libvirt/virterror.h | 6 - 14 files changed, 278 deletions(-) -- 2.35.1

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[libvirt] [PATCH RESEND v2 0/4] re-introduce <acpi-hotplug-bridge>
by Ani Sinha 22 Apr '22

22 Apr '22

Change log: v2: rebased the patchset. Laine's response is appended at the end. I am re-introducing the patchset for <acpi-hotplug-bridge> which got reverted here few months back: https://www.spinics.net/linux/fedora/libvir/msg224089.html The reason for the reversal was that there seemed to be some instability/issues around the use of the qemu commandline which this patchset tries to support. In particular, some guest operating systems did not like the way QEMU was trying to disable native hotplug on pcie root ports. Subsequently, in QEMU 6.2, we have changed our mechanism using which we disable native hotplug. As I understand, we do not have any reported issues so far in 6.2 around this area. QEMU will enter a soft feature freeze in the first week of march in prep for 7.0 release. Libvirt is also entering a new release cycle phaze. Hence, I am introducing this patchset early enough in the release cycles so that if we do see any issues on the qemu side during the rc0, rc1 cycles and if reversal of this patchset is again required, it can be done in time before the next libvirt release end of March. All the patches in this series had been previously reviewed. Some subsequent fixes were made after my initial patches were pushed. I have squashed all those fixes and consolidated them into four patches. I have also updated the documentation to reflect the new changes from the QEMU side and rebased my changes fixing the tests in the process. What changed in QEMU post version 6.1 ? ========================================= We have made basically two major changes in QEMU. First is this change: (1) commit 211afe5c69b597acf85fdd577eb497f5be1ffbd8 Author: Julia Suvorova <jusual(a)redhat.com> Date: Fri Nov 12 06:08:56 2021 -0500 hw/i386/acpi-build: Deny control on PCIe Native Hot-plug in _OSC There are two ways to enable ACPI PCI Hot-plug: * Disable the Hot-plug Capable bit on PCIe slots. This was the first approach which led to regression [1-2], as I/O space for a port is allocated only when it is hot-pluggable, which is determined by HPC bit. * Leave the HPC bit on and disable PCIe Native Hot-plug in _OSC method. This removes the (future) ability of hot-plugging switches with PCIe Native hotplug since ACPI PCI Hot-plug only works with cold-plugged bridges. If the user wants to explicitely use this feature, they can disable ACPI PCI Hot-plug with: --global ICH9-LPC.acpi-pci-hotplug-with-bridge-support=off Change the bit in _OSC method so that the OS selects ACPI PCI Hot-plug instead of PCIe Native. [1] https://gitlab.com/qemu-project/qemu/-/issues/641 [2] https://bugzilla.redhat.com/show_bug.cgi?id=2006409 Signed-off-by: Julia Suvorova <jusual(a)redhat.com> Signed-off-by: Igor Mammedov <imammedo(a)redhat.com> Message-Id: <20211112110857.3116853-5-imammedo(a)redhat.com> Reviewed-by: Ani Sinha <ani(a)anisinha.ca> Reviewed-by: Michael S. Tsirkin <mst(a)redhat.com> Signed-off-by: Michael S. Tsirkin <mst(a)redhat.com> The patch description says it all. Instead of masking out the HPC bit in pcie slots, we keep them turned on. Instead, we do not advertize native hotplug capability for PCIE using _OSC control method. See section 6.2.11 in ACPI spec 6.2. At the same time, we turn on ACPI hotplug for these slots so now the guest OS can select ACPI hotplug instead. The second change is introduction of a property with which we keep the existing behavior for pc-q35-6.1 machines. This means HPC bit is masked and ACPI hotplug is enabled by default for pcie root ports. The QEMU commit is: (2) commit c318bef76206c2ecb6016e8e68c4ac6ff9a4c8cb Author: Julia Suvorova <jusual(a)redhat.com> Date: Fri Nov 12 06:08:54 2021 -0500 hw/acpi/ich9: Add compat prop to keep HPC bit set for 6.1 machine type To solve issues [1-2] the Hot Plug Capable bit in PCIe Slots will be turned on, while the switch to ACPI Hot-plug will be done in the DSDT table. Introducing 'x-keep-native-hpc' property disables the HPC bit only in 6.1 and as a result keeps the forced 'reserve-io' on pcie-root-ports in 6.1 too. [1] https://gitlab.com/qemu-project/qemu/-/issues/641 [2] https://bugzilla.redhat.com/show_bug.cgi?id=2006409 Signed-off-by: Julia Suvorova <jusual(a)redhat.com> Signed-off-by: Igor Mammedov <imammedo(a)redhat.com> Message-Id: <20211112110857.3116853-3-imammedo(a)redhat.com> Reviewed-by: Michael S. Tsirkin <mst(a)redhat.com> Signed-off-by: Michael S. Tsirkin <mst(a)redhat.com> Lastly, as a related side note, because from QEMU 6.2 onwards, we do not mask out HPC bit in PCIE, the work done by this patch is no longer needed: (3) commit e2a6290aab578b2170c1f5909fa556385dc0d820 Author: Marcel Apfelbaum <marcel.apfelbaum(a)gmail.com> Date: Mon Aug 2 12:00:57 2021 +0300 hw/pcie-root-port: Fix hotplug for PCI devices requiring IO Q35 has now ACPI hotplug enabled by default for PCI(e) devices. As opposed to native PCIe hotplug, guests like Fedora 34 will not assign IO range to pcie-root-ports not supporting native hotplug, resulting into a regression. Reproduce by: qemu-bin -M q35 -device pcie-root-port,id=p1 -monitor stdio device_add e1000,bus=p1 In the Guest OS the respective pcie-root-port will have the IO range disabled. Fix it by setting the "reserve-io" hint capability of the pcie-root-ports so the firmware will allocate the IO range instead. Acked-by: Igor Mammedov <imammedo(a)redhat.com> Signed-off-by: Marcel Apfelbaum <marcel(a)redhat.com> Message-Id: <20210802090057.1709775-1-marcel(a)redhat.com> Reviewed-by: Michael S. Tsirkin <mst(a)redhat.com> Signed-off-by: Michael S. Tsirkin <mst(a)redhat.com> This is what commit (2) alludes to. In pc-q35-6.1 machines we do need patch (3) since we mask out HPC bit from pcie ports. I know this is convoluted mess. In fairness I am trying all I can in my spare time to help from the QEMU side. I am determined to see this patchset through into libvirt. Thanks Laine's comments ... My memory isn't completely clear, but I think there was also the issue that the option claims to enable ACPI hotplug when set to on, but instead what it actually does (in the Q35 case at least) is to enable native PCI hotplug when set to off (without actually disabling ACPI hotplug) and disable native PCI hotplug when set to on, or something like that. This ends up leaving it up to the guest OS to decide which type of hotplug to use, meaning its decision could override what's in the libvirt config, thus confusing everyone. Again, I probably have the details mixed up, but it was something like this. I asked mst about this this morning, and he suggested something that you've already done - Cc'ing the series to qemu-devel and the relevant maintainers so we can have a discussion with all involved parties about their opinions on whether we really should expose this existing option in libvirt, or if we should instead have two new options that are more orthogonal about enabling/disabling the two types of hotplug, so that libvirt config can more accurately represent what is being presented to the guest rather than a "best guess" of what we think the guest is going to do with what is presented. (Michael did also say that, with the current flurry of bug reports for the QEMU rc's, this discusion may not happen until closer to release when the bug reports die down. I know this doesn't mesh with your desire to "push now to allow for testing" (which in general would be a good thing if we were certain that we wanted the option like this and were just expecting some minor bugs that could be fixed), but my opinion is that 1) it's possible for anyone interested to test the functionality using <qemu:commandline>, and 2) we should avoid turning libvirt git into a revolving door of experiments. The only practical difference between using <qemu:commandline> and having a dedicated option is that the use of <qemu:commandline> causes the domain to be tainted, and the XML is a bit more complicated. But since the people we're talking about here will already have built their own libvirt binaries, the tainted status of any guests is irrelevant and the extra complexity of using <qemu:commandline> is probably trivial to them :-). Ani Sinha (4): qemu: capablities: detect acpi-pci-hotplug-with-bridge-support conf: introduce support for acpi-bridge-hotplug feature qemu: command: add support for acpi-bridge-hotplug feature NEWS: document new acpi pci hotplug config option NEWS.rst | 8 ++ docs/formatdomain.rst | 32 +++++++ docs/schemas/domaincommon.rng | 15 ++++ src/conf/domain_conf.c | 89 ++++++++++++++++++- src/conf/domain_conf.h | 9 ++ src/qemu/qemu_capabilities.c | 4 + src/qemu/qemu_capabilities.h | 3 + src/qemu/qemu_command.c | 19 ++++ src/qemu/qemu_validate.c | 42 +++++++++ .../caps_6.1.0.x86_64.xml | 1 + .../caps_6.2.0.x86_64.xml | 1 + .../caps_7.0.0.x86_64.xml | 1 + ...-hotplug-bridge-disable.aarch64-latest.err | 1 + .../aarch64-acpi-hotplug-bridge-disable.xml | 13 +++ ...-hotplug-bridge-disable.x86_64-latest.args | 35 ++++++++ .../pc-i440fx-acpi-hotplug-bridge-disable.xml | 36 ++++++++ .../pc-i440fx-acpi-hotplug-bridge-enable.xml | 36 ++++++++ ...pi-hotplug-bridge-disable.x86_64-6.0.0.err | 1 + ...-hotplug-bridge-disable.x86_64-latest.args | 38 ++++++++ .../q35-acpi-hotplug-bridge-disable.xml | 53 +++++++++++ .../q35-acpi-hotplug-bridge-enable.xml | 53 +++++++++++ tests/qemuxml2argvtest.c | 7 ++ ...i-hotplug-bridge-disable.x86_64-latest.xml | 1 + ...pi-hotplug-bridge-enable.x86_64-latest.xml | 1 + ...i-hotplug-bridge-disable.x86_64-latest.xml | 1 + ...pi-hotplug-bridge-enable.x86_64-latest.xml | 1 + tests/qemuxml2xmltest.c | 4 + 27 files changed, 504 insertions(+), 1 deletion(-) create mode 100644 tests/qemuxml2argvdata/aarch64-acpi-hotplug-bridge-disable.aarch64-latest.err create mode 100644 tests/qemuxml2argvdata/aarch64-acpi-hotplug-bridge-disable.xml create mode 100644 tests/qemuxml2argvdata/pc-i440fx-acpi-hotplug-bridge-disable.x86_64-latest.args create mode 100644 tests/qemuxml2argvdata/pc-i440fx-acpi-hotplug-bridge-disable.xml create mode 100644 tests/qemuxml2argvdata/pc-i440fx-acpi-hotplug-bridge-enable.xml create mode 100644 tests/qemuxml2argvdata/q35-acpi-hotplug-bridge-disable.x86_64-6.0.0.err create mode 100644 tests/qemuxml2argvdata/q35-acpi-hotplug-bridge-disable.x86_64-latest.args create mode 100644 tests/qemuxml2argvdata/q35-acpi-hotplug-bridge-disable.xml create mode 100644 tests/qemuxml2argvdata/q35-acpi-hotplug-bridge-enable.xml create mode 120000 tests/qemuxml2xmloutdata/pc-i440fx-acpi-hotplug-bridge-disable.x86_64-latest.xml create mode 120000 tests/qemuxml2xmloutdata/pc-i440fx-acpi-hotplug-bridge-enable.x86_64-latest.xml create mode 120000 tests/qemuxml2xmloutdata/q35-acpi-hotplug-bridge-disable.x86_64-latest.xml create mode 120000 tests/qemuxml2xmloutdata/q35-acpi-hotplug-bridge-enable.x86_64-latest.xml -- 2.25.1

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[libvirt PATCH v3 0/2] iohelper refactoring of io copy function
by Claudio Fontana 21 Apr '22

21 Apr '22

changes v1 -> v2: * fix missing write changes v2 -> v3: * move error reporting back into the copy function * split into two patches, one introducing the IO parameters struct, and another introducing the new function. Claudio Fontana (2): iohelper: introduce new struct to carry copy operation parameters iohelper: refactor copy operation as a separate function src/util/iohelper.c | 170 ++++++++++++++++++++++++++------------------ 1 file changed, 100 insertions(+), 70 deletions(-) -- 2.34.1

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[libvirt PATCH v2] iohelper: some refactoring
by Claudio Fontana 21 Apr '22

21 Apr '22

while doing research with alternative implementations of runIO, it seemed necessary to do some refactoring, in order to separate parameter setting from the actual copy, so that alternative copy methods can be researched and hopefully eventually implemented. No functional changes are expected. Signed-off-by: Claudio Fontana <cfontana(a)suse.de> --- src/util/iohelper.c | 197 +++++++++++++++++++++++++++----------------- 1 file changed, 122 insertions(+), 75 deletions(-) changes v1 -> v2: * fix missing write diff --git a/src/util/iohelper.c b/src/util/iohelper.c index 2c91bf4f93..ca569b5ae9 100644 --- a/src/util/iohelper.c +++ b/src/util/iohelper.c @@ -45,21 +45,38 @@ # define O_DIRECT 0 #endif -static int -runIO(const char *path, int fd, int oflags) +struct runIOParams { + bool isBlockDev; + bool isDirect; + bool isWrite; + int fdin; + const char *fdinname; + int fdout; + const char *fdoutname; +}; + +/* runIOCopy: execute the IO copy based on the passed parameters */ +/** + * runIOCopy: + * @p: the IO parameters + * + * Execute the copy based on the passed parameters. + * + * Returns: size transfered, or < 0 on error. + * Errors: -1 = read/write error + * -2 = read error + * -3 = write error + * -4 = truncate error + */ + +static off_t +runIOCopy(const struct runIOParams p) { g_autofree void *base = NULL; /* Location to be freed */ char *buf = NULL; /* Aligned location within base */ size_t buflen = 1024*1024; intptr_t alignMask = 64*1024 - 1; - int ret = -1; - int fdin, fdout; - const char *fdinname, *fdoutname; - unsigned long long total = 0; - bool direct = O_DIRECT && ((oflags & O_DIRECT) != 0); - off_t end = 0; - struct stat sb; - bool isBlockDev = false; + off_t total = 0; #if WITH_POSIX_MEMALIGN if (posix_memalign(&base, alignMask + 1, buflen)) @@ -71,50 +88,6 @@ runIO(const char *path, int fd, int oflags) buf = (char *) (((intptr_t) base + alignMask) & ~alignMask); #endif - if (fstat(fd, &sb) < 0) { - virReportSystemError(errno, - _("Unable to access file descriptor %d path %s"), - fd, path); - goto cleanup; - } - isBlockDev = S_ISBLK(sb.st_mode); - - switch (oflags & O_ACCMODE) { - case O_RDONLY: - fdin = fd; - fdinname = path; - fdout = STDOUT_FILENO; - fdoutname = "stdout"; - /* To make the implementation simpler, we give up on any - * attempt to use O_DIRECT in a non-trivial manner. */ - if (!isBlockDev && direct && ((end = lseek(fd, 0, SEEK_CUR)) != 0)) { - virReportSystemError(end < 0 ? errno : EINVAL, "%s", - _("O_DIRECT read needs entire seekable file")); - goto cleanup; - } - break; - case O_WRONLY: - fdin = STDIN_FILENO; - fdinname = "stdin"; - fdout = fd; - fdoutname = path; - /* To make the implementation simpler, we give up on any - * attempt to use O_DIRECT in a non-trivial manner. */ - if (!isBlockDev && direct && (end = lseek(fd, 0, SEEK_END)) != 0) { - virReportSystemError(end < 0 ? errno : EINVAL, "%s", - _("O_DIRECT write needs empty seekable file")); - goto cleanup; - } - break; - - case O_RDWR: - default: - virReportSystemError(EINVAL, - _("Unable to process file with flags %d"), - (oflags & O_ACCMODE)); - goto cleanup; - } - while (1) { ssize_t got; @@ -124,53 +97,127 @@ runIO(const char *path, int fd, int oflags) * writes will be aligned. * In other cases using saferead reduces number of syscalls. */ - if (fdin == fd && direct) { - if ((got = read(fdin, buf, buflen)) < 0 && + if (!p.isWrite && p.isDirect) { + if ((got = read(p.fdin, buf, buflen)) < 0 && errno == EINTR) continue; } else { - got = saferead(fdin, buf, buflen); - } - - if (got < 0) { - virReportSystemError(errno, _("Unable to read %s"), fdinname); - goto cleanup; + got = saferead(p.fdin, buf, buflen); } + if (got < 0) + return -2; if (got == 0) break; total += got; /* handle last write size align in direct case */ - if (got < buflen && direct && fdout == fd) { + if (got < buflen && p.isDirect && p.isWrite) { ssize_t aligned_got = (got + alignMask) & ~alignMask; memset(buf + got, 0, aligned_got - got); - if (safewrite(fdout, buf, aligned_got) < 0) { - virReportSystemError(errno, _("Unable to write %s"), fdoutname); - goto cleanup; + if (safewrite(p.fdout, buf, aligned_got) < 0) { + return -3; } - - if (!isBlockDev && ftruncate(fd, total) < 0) { - virReportSystemError(errno, _("Unable to truncate %s"), fdoutname); - goto cleanup; + if (!p.isBlockDev && ftruncate(p.fdout, total) < 0) { + return -4; } - break; } - if (safewrite(fdout, buf, got) < 0) { - virReportSystemError(errno, _("Unable to write %s"), fdoutname); + if (safewrite(p.fdout, buf, got) < 0) { + return -3; + } + } + return total; +} + +static int +runIO(const char *path, int fd, int oflags) +{ + int ret = -1; + off_t total = 0; + struct stat sb; + struct runIOParams p; + + if (fstat(fd, &sb) < 0) { + virReportSystemError(errno, + _("Unable to access file descriptor %d path %s"), + fd, path); + goto cleanup; + } + p.isBlockDev = S_ISBLK(sb.st_mode); + p.isDirect = O_DIRECT && (oflags & O_DIRECT); + + switch (oflags & O_ACCMODE) { + case O_RDONLY: + p.isWrite = false; + p.fdin = fd; + p.fdinname = path; + p.fdout = STDOUT_FILENO; + p.fdoutname = "stdout"; + break; + case O_WRONLY: + p.isWrite = true; + p.fdin = STDIN_FILENO; + p.fdinname = "stdin"; + p.fdout = fd; + p.fdoutname = path; + break; + case O_RDWR: + default: + virReportSystemError(EINVAL, + _("Unable to process file with flags %d"), + (oflags & O_ACCMODE)); + goto cleanup; + } + /* To make the implementation simpler, we give up on any + * attempt to use O_DIRECT in a non-trivial manner. */ + if (!p.isBlockDev && p.isDirect) { + off_t end; + if (p.isWrite) { + if ((end = lseek(fd, 0, SEEK_END)) != 0) { + virReportSystemError(end < 0 ? errno : EINVAL, "%s", + _("O_DIRECT write needs empty seekable file")); + goto cleanup; + } + } else if ((end = lseek(fd, 0, SEEK_CUR)) != 0) { + virReportSystemError(end < 0 ? errno : EINVAL, "%s", + _("O_DIRECT read needs entire seekable file")); goto cleanup; } } + total = runIOCopy(p); + + if (total < 0) { + switch (total) { + case -1: + virReportSystemError(errno, _("Unable to move data from %s to %s"), + p.fdinname, p.fdoutname); + break; + case -2: + virReportSystemError(errno, _("Unable to read %s"), p.fdinname); + break; + case -3: + virReportSystemError(errno, _("Unable to write %s"), p.fdoutname); + break; + case -4: + virReportSystemError(errno, _("Unable to truncate %s"), p.fdoutname); + break; + default: + virReportError(VIR_ERR_INTERNAL_ERROR, _("Unknown runIOCopy error %ld"), total); + break; + } + goto cleanup; + } + /* Ensure all data is written */ - if (virFileDataSync(fdout) < 0) { + if (virFileDataSync(p.fdout) < 0) { if (errno != EINVAL && errno != EROFS) { /* fdatasync() may fail on some special FDs, e.g. pipes */ - virReportSystemError(errno, _("unable to fsync %s"), fdoutname); + virReportSystemError(errno, _("unable to fsync %s"), p.fdoutname); goto cleanup; } } -- 2.35.1

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[RFC PATCH v1 0/5] Add virDomainGetSevAttestationReport API
by Tyler Fanelli 21 Apr '22

21 Apr '22

This an RFC discussing a new API, virDomainGetSevAttestationReport (along with a virsh command "domgetsevreport"), with initial QEMU support via the "query-sev-attestation-report" QAPI mechanism. "query-sev-attestation-report" is supplied a base64-encoded 16 byte "mnonce" string as input, with a purpose of being embedded into the attestation report to provide protection. My main point of concern is the design/communication of the virTypedParameterPtr exchanged between the client and libvirtd and how they interact together, as I have seen no other API follow the method I used. Namely, the same virTypedParameterPtr is used for both input _AND_ output. The same virTypedParameterPtr containing the original mnonce string inputted to the API is also used to contain the attestation report upon being returned from the API. This contrasts with much of the APIs I've noticed, which use a virTypedParameterPtr for either input or output, but not both. This patch is not final, as I still would like some human-readable outputting and storage of the attestation report. Looking for thoughts on the design of this API, as well as suggested improvements. Tyler Fanelli (5): libvirt: Introduce virDomainGetSevAttestationReport public API remote: add RPC support for the virDomainGetSevAttestationReport API qemu_capabilities: Introduce QEMU_CAPS_SEV_GET_ATTESTATION_REPORT qemu: Implement the virDomainGetSevAttestationReport API tools: add domgetsevreport virsh command docs/manpages/virsh.rst | 18 ++++ include/libvirt/libvirt-domain.h | 22 +++++ src/driver-hypervisor.h | 7 ++ src/libvirt-domain.c | 63 ++++++++++++++ src/libvirt_public.syms | 4 + src/qemu/qemu_capabilities.c | 2 + src/qemu/qemu_capabilities.h | 1 + src/qemu/qemu_driver.c | 86 +++++++++++++++++++ src/qemu/qemu_monitor.c | 11 +++ src/qemu/qemu_monitor.h | 5 ++ src/qemu/qemu_monitor_json.c | 40 +++++++++ src/qemu/qemu_monitor_json.h | 5 ++ src/remote/remote_daemon_dispatch.c | 44 ++++++++++ src/remote/remote_driver.c | 55 ++++++++++++ src/remote/remote_protocol.x | 21 ++++- src/remote_protocol-structs | 12 +++ .../caps_6.1.0.x86_64.xml | 1 + .../caps_6.2.0.x86_64.xml | 1 + .../caps_7.0.0.x86_64.xml | 1 + tools/virsh-domain.c | 68 +++++++++++++++ 20 files changed, 466 insertions(+), 1 deletion(-) -- 2.34.1

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[PATCH RESEND] qemu: disarm fake reboot flag on reset
by Nikolay Shirokovskiy 21 Apr '22

21 Apr '22

From: Maxim Nestratov <mnestratov(a)virtuozzo.com> This is a quite an old (created at 2016) patch fixing an issue for at that time contemporary Fedora 23. virsh reboot returns success (yet after hanging for a while), VM is rebooted sucessfully too but then shutdown from inside guest causes reboot and not shutdown. VM has agent installed. So virsh reboot first tries to reboot VM thru the agent. The agent calls 'shutdown -r' command. Typically it returns instantly but on this distro for some reason it takes time. I did not investigate the cause but the command waits in dbus client code, probably waits for reply. The libvirt waits 60s for agent command to execute and then errors out. Next reboot API falls back to ACPI shutdown which returns successfully thus the reboot command return success too. Yet shutdown command in guest eventually successfull and guest is truly rebooted. So libvirt does not receive SHUTDOWN event and fake reboot flag which is armed on fallback path stays armed. Thus next shutdown from guest leads to reboot. The issue has 100% repro on Fedora 23. On modern distros I can't reproduce it at all. Shutdown command is asynchronous and returns immediately even if I start some service that ignores TERM signal and thus shutdown procedure waits for 90s (if I not mistaken) before sending KILL. Yet I guess it is nice to have this patch to be more robust. Signed-off-by: Nikolay Shirokovskiy <nikolay.shirokovskiy(a)openvz.org> --- src/qemu/qemu_process.c | 1 + 1 file changed, 1 insertion(+) diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c index f63fc3389d..d81ed9391a 100644 --- a/src/qemu/qemu_process.c +++ b/src/qemu/qemu_process.c @@ -435,6 +435,7 @@ qemuProcessHandleReset(qemuMonitor *mon G_GNUC_UNUSED, if (priv->agent) qemuAgentNotifyEvent(priv->agent, QEMU_AGENT_EVENT_RESET); + qemuDomainSetFakeReboot(vm, false); qemuDomainSaveStatus(vm); unlock: -- 2.35.1

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[libvirt PATCH 00/10] Cleanup and test more firmware handling scenarios
by Daniel P. Berrangé 21 Apr '22

21 Apr '22

There are a mind bending number of possible ways to configure the firmware with/without NVRAM. Only a small portion are tested and many error scenarios are silently ignored. This series attempts to get coverage of every possible XML config scenario and report explicit errors in all invalid configs. There is an open question on patch 4. Essentially the use of NVRAM combined with writable executable feels like an accidental feature in libvirt that hasn't really been thought through. I'd like to better define expectations here but there are several possible strategies and I'm undecided which is best. Daniel P. Berrangé (10): qemu: fix bad indentation for qemuDomainNVRAMPathFormat tests: add explicit test case for pflash loader lacking path tests: add test case for NVRAM with template conf: validate NVRAM template usage with R/W loader binary tests: don't permit NVRAM path when using firmware auto-select qemu: inline code for filling in per-VM NVRAM path conf: rename struct field for NVRAM template conf: switch nvram parsing to use XML node / property helpers conf: move nvram parsing into virDomainLoaderDefParseXML conf: stop ignoring <loader>/<nvram> with firmware auto-select src/conf/domain_conf.c | 121 +++++++++++------- src/conf/domain_conf.h | 2 +- src/qemu/qemu_domain.c | 18 +-- src/qemu/qemu_domain.h | 8 +- src/qemu/qemu_firmware.c | 13 +- src/qemu/qemu_process.c | 4 +- tests/qemuxml2argvdata/bios-nvram-no-path.err | 1 + tests/qemuxml2argvdata/bios-nvram-no-path.xml | 19 +++ ...-nvram-rw-template-vars.x86_64-latest.args | 41 ++++++ .../bios-nvram-rw-template-vars.xml | 36 ++++++ .../bios-nvram-rw-template.err | 1 + .../bios-nvram-rw-template.xml | 36 ++++++ .../bios-nvram-rw-vars.x86_64-latest.args | 41 ++++++ tests/qemuxml2argvdata/bios-nvram-rw-vars.xml | 36 ++++++ .../bios-nvram-template.x86_64-latest.args | 37 ++++++ .../qemuxml2argvdata/bios-nvram-template.xml | 21 +++ tests/qemuxml2argvdata/os-firmware-bios.xml | 1 - .../os-firmware-efi-bad-loader-path.err | 1 + .../os-firmware-efi-bad-loader-path.xml | 67 ++++++++++ .../os-firmware-efi-bad-loader-type.err | 1 + .../os-firmware-efi-bad-loader-type.xml | 67 ++++++++++ .../os-firmware-efi-bad-nvram-path.err | 1 + .../os-firmware-efi-bad-nvram-path.xml | 68 ++++++++++ .../os-firmware-efi-bad-nvram-template.err | 1 + .../os-firmware-efi-bad-nvram-template.xml | 68 ++++++++++ .../os-firmware-efi-secboot.xml | 1 - tests/qemuxml2argvdata/os-firmware-efi.xml | 1 - tests/qemuxml2argvtest.c | 9 ++ .../os-firmware-bios.x86_64-latest.xml | 1 - .../os-firmware-efi-secboot.x86_64-latest.xml | 1 - .../os-firmware-efi.x86_64-latest.xml | 1 - 31 files changed, 647 insertions(+), 77 deletions(-) create mode 100644 tests/qemuxml2argvdata/bios-nvram-no-path.err create mode 100644 tests/qemuxml2argvdata/bios-nvram-no-path.xml create mode 100644 tests/qemuxml2argvdata/bios-nvram-rw-template-vars.x86_64-latest.args create mode 100644 tests/qemuxml2argvdata/bios-nvram-rw-template-vars.xml create mode 100644 tests/qemuxml2argvdata/bios-nvram-rw-template.err create mode 100644 tests/qemuxml2argvdata/bios-nvram-rw-template.xml create mode 100644 tests/qemuxml2argvdata/bios-nvram-rw-vars.x86_64-latest.args create mode 100644 tests/qemuxml2argvdata/bios-nvram-rw-vars.xml create mode 100644 tests/qemuxml2argvdata/bios-nvram-template.x86_64-latest.args create mode 100644 tests/qemuxml2argvdata/bios-nvram-template.xml create mode 100644 tests/qemuxml2argvdata/os-firmware-efi-bad-loader-path.err create mode 100644 tests/qemuxml2argvdata/os-firmware-efi-bad-loader-path.xml create mode 100644 tests/qemuxml2argvdata/os-firmware-efi-bad-loader-type.err create mode 100644 tests/qemuxml2argvdata/os-firmware-efi-bad-loader-type.xml create mode 100644 tests/qemuxml2argvdata/os-firmware-efi-bad-nvram-path.err create mode 100644 tests/qemuxml2argvdata/os-firmware-efi-bad-nvram-path.xml create mode 100644 tests/qemuxml2argvdata/os-firmware-efi-bad-nvram-template.err create mode 100644 tests/qemuxml2argvdata/os-firmware-efi-bad-nvram-template.xml -- 2.34.1

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