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465f1b9d4c
Use of qemuDomainValidateVcpuInfo in the helpers for hotplug and unplug of vCPUs can lead to spurious errors reported such as: internal error: qemu didn't report thread id for vcpu 'XX'" The reason for this is that qemuDomainValidateVcpuInfo validates the state of all vCPUs against the expected state of vCPUs. If an unplug operation completed before libvirt was unable to process it yet the expected state could not reflect the current state. To avoid spurious errors the qemuDomainHotplugAddVcpu and qemuDomainRemoveVcpu functions are modified to do localized validation only for the vCPUs they actually modify. We also now ensure that the cgroups are modified before bailing out on error for any vCPUs which passed validation. Additionally in order for qemuDomainRemoveVcpuAlias to be able to find the unplugged vCPU we must ensure that qemuDomainRefreshVcpuInfo does not clear out the alias in case when the vCPU is no longer reported by qemu. Co-authored-by: Partha Satapathy <partha.satapathy@oracle.com> Signed-off-by: Shaleen Bathla <shaleen.bathla@oracle.com> Signed-off-by: Peter Krempa <pkrempa@redhat.com> Reviewed-by: Ján Tomko <jtomko@redhat.com>
libvirt library code README
===========================
The directory provides the bulk of the libvirt codebase. Everything
except for the libvirtd daemon and client tools. The build uses a
large number of libtool convenience libraries - one for each child
directory, and then links them together for the final libvirt.so,
although some bits get linked directly to libvirtd daemon instead.
The files directly in this directory are supporting the public API
entry points & data structures.
There are two core shared modules to be aware of:
* util/ - a collection of shared APIs that can be used by any
code. This directory is always in the include path
for all things built
* conf/ - APIs for parsing / manipulating all the official XML
files used by the public API. This directory is only
in the include path for driver implementation modules
* vmx/ - VMware VMX config handling (used by esx/ and vmware/)
Then there are the hypervisor implementations:
* bhyve - bhyve - The BSD Hypervisor
* esx/ - VMware ESX and GSX support using vSphere API over SOAP
* hyperv/ - Microsoft Hyper-V support using WinRM
* lxc/ - Linux Native Containers
* openvz/ - OpenVZ containers using cli tools
* qemu/ - QEMU / KVM using qemu CLI/monitor
* remote/ - Generic libvirt native RPC client
* test/ - A "mock" driver for testing
* vbox/ - Virtual Box using native API
* vmware/ - VMware Workstation and Player using the vmrun tool
* xen/ - Xen using hypercalls, XenD SEXPR & XenStore
Finally some secondary drivers that are shared for several HVs.
Currently these are used by LXC, OpenVZ, QEMU and Xen drivers.
The ESX, Hyper-V, Remote, Test & VirtualBox drivers all
implement the secondary drivers directly
* cpu/ - CPU feature management
* interface/ - Host network interface management
* network/ - Virtual NAT networking
* nwfilter/ - Network traffic filtering rules
* node_device/ - Host device enumeration
* secret/ - Secret management
* security/ - Mandatory access control drivers
* storage/ - Storage management drivers
Since both the hypervisor and secondary drivers can be built as
dlopen()able modules, it is *FORBIDDEN* to have build dependencies
between these directories. Drivers are only allowed to depend on
the public API, and the internal APIs in the util/ and conf/
directories