[libvirt] [PATCH 00/21] qemu_hotplug: refactor device detach functions to fix one serious and other minor bugs

This all started with the observation that we were sending the DEVICE_REMOVED events for unplugged devices too soon (reported in https://bugzilla.redhat.com/1658198 ). While noticing that *all* of the device types send their DEVICE_REMOVED event too early, I also noticed how eerily similar all the different detach functions are (they have converged over time, as legacy code supporting old qemus with different methods of deleting different types of devices has been removed - pkrempa and mprivozn committed patches just in the last week that contributed to this convergence and removed some duplicated code). I also saw a few other definite bugs, as well as a couple that I think are bugs, but am not enough informed about zPCI to be certain (I've Cc'ed the author and reviewers of the original patch adding that code to the patches so that they can verify, or negate, my suspicions). Many/most of these patches are either very simple / easily verifiable code movement / removal / renaming of variables. Patch 20 is a bit more involved; viewing the new versions of the functions along with the patch would probably help it go much quicker. The first two patches in the series eliminate what I'm 99% certain is erroneous calling of the qemuDomainDetachExtensionDevice() when detaching a PCI device on S390. The commit log details my reasons for believing this code should be removed. The rest of the series eliminates small differences iteratively, arriving at a set of detach functions which are completely identical at the end (and only called from one place), and then replaces all those duplicates with a single block of common code in a higher level function that calls all of the individual functions (it was their only caller anyway). This eliminated the inconsistent application of checking for multifunction PCI devices and for the existence of a device alias. It also eliminated individual calls to qemuDomainRemove*Device() calls, and replaced them with a single call to qemuDomainRemoveDevice(). Eliminating all the calls (except one) to the individual qemuDomainRemove*Device() functions in turn made it possible to move the code that builds and queues the DEVICE_REMOVED event into a single place in the one remaining higher level caller - qemuDomainRemoveDevice() - thus eliminating the "premature event" for *all* device types at once. Laine Stump (21): qemu_hotplug: remove erroneous call to qemuDomainDetachExtensionDevice() qemu_hotplug: remove another erroneous qemuDomainDetachExtensionDevice() call qemu_hotplug: remove unnecessary check for valid PCI address qemu_hotplug: rename a virDomainDeviceInfoPtr to avoid confusion qemu_hotplug: eliminate multiple identical qemuDomainDetachHost*Device() functions qemu_hotplug: eliminate unnecessary call to qemuDomainDetachNetDevice() qemu_hotplug: refactor qemuDomainDetachDiskLive and qemuDomainDetachDiskDevice qemu_hotplug: don't call DetachThisHostDevice for hostdev network devices qemu_hotplug: merge qemuDomainDetachThisHostDevice into qemuDomainDetachHostDevice qemu_hotplug: move qemuDomainChangeGraphicsPasswords() qemu_hotplug: move (almost) all qemuDomainDetach*() functions together qemu_hotplug: move (Attach|Detach)Lease functions with others of same type qemu_hotplug: move qemuDomainDetachDeviceLive() to qemu_hotplug.c qemu_hotplug: remove extra function in middle of DetachController call chain qemu_hotplug: pull qemuDomainUpdateDeviceList out of qemuDomainDetachDeviceLive test: replace calls to individual detach functions with one call to main detach qemu_hotplug: rename dev to match in qemuDomainDetachDeviceLive qemu_hotplug: standardize the names/args/calling of qemuDomainDetach*() qemu_hotplug: new function qemuDomainRemoveAuditDevice() qemu_hotplug: consolidate all common detach code in qemuDomainDetachDeviceLive qemu_hotplug: delay sending DEVICE_REMOVED event until after *all* teardown src/qemu/qemu_driver.c | 102 +-- src/qemu/qemu_hotplug.c | 1407 ++++++++++++++++++--------------------- src/qemu/qemu_hotplug.h | 56 +- tests/qemuhotplugtest.c | 8 +- 4 files changed, 655 insertions(+), 918 deletions(-) Yay! jtomko would be proud - more deletions than insertions!!! -- 2.20.1