Re: [PATCH v1] Add basic driver for the Cloud-Hypervisor

Cloud-Hypervisor is a KVM virtualization using hypervisor. It functions similarly to qemu and the libvirt Cloud-Hypervisor driver uses a very similar structure to the libvirt driver. The biggest difference from the libvirt perspective is that the "monitor" socket is seperated into two sockets one that commands are issued to and one that events are notified from. The current implementation only uses the command socket (running over a REST API with json encoded data) with future changes to add support for the event socket (to better handle shutdowns from inside the VM). This patch adds support for the following initial VM actions using the Cloud-Hypervsior API: * vm.create * vm.delete * vm.boot * vm.shutdown * vm.reboot * vm.pause * vm.resume To use the Cloud-Hypervisor driver, the v0.14.0 release of Cloud-Hypervisor is required to be installed. Some additional notes: * The curl handle is persistent but not useful to detect ch process shutdown/crash (a future patch will address this shortcoming) * On a 64-bit host Cloud-Hypervisor needs to support PVH and so can emulate 32-bit mode but it isn't fully tested (a 64-bit kernel and 32-bit userspace is fine, a 32-bit kernel is unsupported)

* The pause ch implements pauses execution of the guest cpus (and disk/network i/o threads) which seems to align with https://wiki.libvirt.org/page/VM_lifecycle#Pausing_a_guest_domain

* Updated spec file to disable ch driver by default

diff --git a/include/libvirt/virterror.h b/include/libvirt/virterror.h index 524a7bf9e8..57986931fd 100644 --- a/include/libvirt/virterror.h +++ b/include/libvirt/virterror.h @@ -136,6 +136,7 @@ typedef enum { VIR_FROM_TPM = 70, /* Error from TPM */ VIR_FROM_BPF = 71, /* Error from BPF code */ + VIR_FROM_CH = 72, /* Error from Cloud-Hypervisor driver */

diff --git a/libvirt.spec.in b/libvirt.spec.in index da7af2824e..4eeb4dc1b4 100644 --- a/libvirt.spec.in +++ b/libvirt.spec.in @@ -244,6 +244,9 @@ Requires: libvirt-daemon-driver-lxc = %{version}-%{release} %if %{with_qemu} Requires: libvirt-daemon-driver-qemu = %{version}-%{release} %endif +%if %{with_ch} +Requires: libvirt-daemon-driver-ch = %{version}-%{release} +%endif # We had UML driver, but we've removed it. Obsoletes: libvirt-daemon-driver-uml <= 5.0.0 Obsoletes: libvirt-daemon-uml <= 5.0.0 @@ -761,6 +764,20 @@ QEMU %endif +%if %{with_ch} +%package daemon-driver-ch +Summary: Cloud-Hypervisor driver plugin for the libvirtd daemon +Requires: libvirt-daemon = %{version}-%{release} +Requires: libvirt-libs = %{version}-%{release} +Requires: /usr/bin/cloud-hypervisor + +%description daemon-driver-ch +The Cloud-Hypervisor driver plugin for the libvirtd daemon, +providing an implementation of the hypervisor driver APIs +using Cloud-Hypervisor +%endif + + %if %{with_lxc} %package daemon-driver-lxc Summary: LXC driver plugin for the libvirtd daemon @@ -1003,6 +1020,12 @@ exit 1 %define arg_qemu -Ddriver_qemu=disabled %endif +%if %{with_ch} + %define arg_ch -Ddriver_ch=enabled +%else + %define arg_ch -Ddriver_ch=disabled +%endif + %if %{with_openvz} %define arg_openvz -Ddriver_openvz=enabled %else @@ -1146,6 +1169,7 @@ export SOURCE_DATE_EPOCH=$(stat --printf='%Y' %{_specdir}/%{name}.spec) %meson \ -Drunstatedir=%{_rundir} \ %{?arg_qemu} \ + %{?arg_ch} \ %{?arg_openvz} \ %{?arg_lxc} \ %{?arg_vbox} \ @@ -1771,6 +1795,13 @@ exit 0 %{_mandir}/man8/virtqemud.8* %endif +%if %{with_ch} +%files daemon-driver-ch +%dir %attr(0700, root, root) %{_localstatedir}/log/libvirt/ch/ +%ghost %dir %{_rundir}/libvirt/ch/ +%{_libdir}/%{name}/connection-driver/libvirt_driver_ch.so +%endif + %if %{with_lxc} %files daemon-driver-lxc %config(noreplace) %{_sysconfdir}/sysconfig/virtlxcd

diff --git a/meson.build b/meson.build index 951da67896..8c33efb25c 100644 --- a/meson.build +++ b/meson.build @@ -1517,6 +1517,48 @@ elif get_option('driver_lxc').enabled() error('linux and remote_driver are required for LXC') endif +if not get_option('driver_ch').disabled() and host_machine.system() == 'linux' + use_ch = true + + if not conf.has('WITH_LIBVIRTD') + use_ch = false + if get_option('driver_ch').enabled() + error('libvirtd is required to build Cloud-Hypervisor driver') + endif + endif + + if not yajl_dep.found() + use_ch = false + if get_option('driver_ch').enabled() + error('YAJL 2 is required to build Cloud-Hypervisor driver') + endif + endif + + if not curl_dep.found() + use_ch = false + if get_option('driver_ch').enabled() + error('curl is required to build Cloud-Hypervisor driver') + endif + endif + + if use_ch + conf.set('WITH_CH', 1) + + default_ch_user = 'root' + default_ch_group = 'root' + ch_user = get_option('ch_user') + if ch_user == '' + ch_user = default_ch_user + endif + ch_group = get_option('ch_group') + if ch_group == '' + ch_group = default_ch_group + endif + conf.set_quoted('CH_USER', ch_user) + conf.set_quoted('CH_GROUP', ch_group) + endif +endif

+/* Functions */ +virCaps *virCHDriverCapsInit(void) +{ + virCaps *caps; + virCapsGuest *guest; + g_autofree char *ch_cmd = NULL; + + if ((caps = virCapabilitiesNew(virArchFromHost(), + false, false)) == NULL) + goto cleanup; + + if (!(caps->host.numa = virCapabilitiesHostNUMANewHost())) + goto cleanup; + + if (virCapabilitiesInitCaches(caps) < 0) + goto cleanup; + + if ((guest = virCapabilitiesAddGuest(caps, + VIR_DOMAIN_OSTYPE_HVM, + caps->host.arch, + NULL, + NULL, + 0, + NULL)) == NULL) + goto cleanup;

+ + if (virCapabilitiesAddGuestDomain(guest, + VIR_DOMAIN_VIRT_KVM, + NULL, + NULL, + 0, + NULL) == NULL) + goto cleanup; + + ch_cmd = g_find_program_in_path(CH_CMD); + if (!ch_cmd) + goto cleanup;

+/* Function Tables */ +static virHypervisorDriver chHypervisorDriver = { + .name = "CH", + .connectURIProbe = chConnectURIProbe, + .connectOpen = chConnectOpen, /* 6.7.0 */ + .connectClose = chConnectClose, /* 6.7.0 */ + .connectGetType = chConnectGetType, /* 6.7.0 */ + .connectGetVersion = chConnectGetVersion, /* 6.7.0 */ + .connectGetHostname = chConnectGetHostname, /* 6.7.0 */ + .connectNumOfDomains = chConnectNumOfDomains, /* 6.7.0 */ + .connectListAllDomains = chConnectListAllDomains, /* 6.7.0 */ + .connectListDomains = chConnectListDomains, /* 6.7.0 */ + .connectGetCapabilities = chConnectGetCapabilities, /* 6.7.0 */ + .domainCreateXML = chDomainCreateXML, /* 6.7.0 */ + .domainCreate = chDomainCreate, /* 6.7.0 */ + .domainCreateWithFlags = chDomainCreateWithFlags, /* 6.7.0 */ + .domainShutdown = chDomainShutdown, /* 6.7.0 */ + .domainShutdownFlags = chDomainShutdownFlags, /* 6.7.0 */ + .domainReboot = chDomainReboot, /* 6.7.0 */ + .domainSuspend = chDomainSuspend, /* 6.7.0 */ + .domainResume = chDomainResume, /* 6.7.0 */ + .domainDestroy = chDomainDestroy, /* 6.7.0 */ + .domainDestroyFlags = chDomainDestroyFlags, /* 6.7.0 */ + .domainDefineXML = chDomainDefineXML, /* 6.7.0 */ + .domainDefineXMLFlags = chDomainDefineXMLFlags, /* 6.7.0 */ + .domainUndefine = chDomainUndefine, /* 6.7.0 */ + .domainUndefineFlags = chDomainUndefineFlags, /* 6.7.0 */ + .domainLookupByID = chDomainLookupByID, /* 6.7.0 */ + .domainLookupByUUID = chDomainLookupByUUID, /* 6.7.0 */ + .domainLookupByName = chDomainLookupByName, /* 6.7.0 */ + .domainGetState = chDomainGetState, /* 6.7.0 */ + .domainGetXMLDesc = chDomainGetXMLDesc, /* 6.7.0 */ + .domainGetInfo = chDomainGetInfo, /* 6.7.0 */ + .domainIsActive = chDomainIsActive, /* 6.7.0 */ + .nodeGetInfo = chNodeGetInfo, /* 6.7.0 */ +};

+static virConnectDriver chConnectDriver = { + .localOnly = true, + .uriSchemes = (const char *[]){"ch", "Cloud-Hypervisor", NULL},