Re: [libvirt] [PATCH 7/8] qemu: Support newer ivshmem device variants

QEMU added support for ivshmem-plain and ivshmem-doorbell. Those are reworked varians of legacy ivshmem that are compatible from the guest POV, but not from host's POV and have sane specification and handling.

Details about the newer device type can be found in qemu's commit 5400c02b90bb: http://git.qemu.org/?p=qemu.git;a=commit;h=5400c02b90bb Signed-off-by: Martin Kletzander <mkletzan(a)redhat.com&gt; --- src/qemu/qemu_command.c | 88 +++++++++++++++++++++- src/qemu/qemu_command.h | 10 +++ .../qemuxml2argv-shmem-plain-doorbell.args | 43 +++++++++++ .../qemuxml2argv-shmem-plain-doorbell.xml | 63 ++++++++++++++++ tests/qemuxml2argvtest.c | 3 + 5 files changed, 204 insertions(+), 3 deletions(-) create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-shmem-plain-doorbell.args create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-shmem-plain-doorbell.xml diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index aa8cff80e8b1..29f7130ef911 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -8456,6 +8456,39 @@ qemuBuildShmemDevLegacyStr(virDomainDefPtr def, return NULL; } +char * +qemuBuildShmemDevStr(virDomainDefPtr def, + virDomainShmemDefPtr shmem, + virQEMUCapsPtr qemuCaps) +{ + virBuffer buf = VIR_BUFFER_INITIALIZER; + + virBufferAsprintf(&buf, "%s", virDomainShmemModelTypeToString(shmem->model)); + virBufferAsprintf(&buf, ",id=%s", shmem->info.alias); + + if (shmem->server.enabled) + virBufferAsprintf(&buf, ",chardev=char%s", shmem->info.alias); + else + virBufferAsprintf(&buf, ",memdev=shmmem-%s", shmem->info.alias); + + if (shmem->msi.vectors) + virBufferAsprintf(&buf, ",vectors=%u", shmem->msi.vectors); + if (shmem->msi.ioeventfd) { + virBufferAsprintf(&buf, ",ioeventfd=%s", + virTristateSwitchTypeToString(shmem->msi.ioeventfd)); + } + + if (qemuBuildDeviceAddressStr(&buf, def, &shmem->info, qemuCaps) < 0) { + virBufferFreeAndReset(&buf); + return NULL; + } + + if (virBufferCheckError(&buf) < 0)

+ return NULL; + + return virBufferContentAndReset(&buf); +} + static char * qemuBuildShmemBackendChrStr(virLogManagerPtr logManager, virCommandPtr cmd, @@ -8476,6 +8509,50 @@ qemuBuildShmemBackendChrStr(virLogManagerPtr logManager, return devstr; } + +virJSONValuePtr +qemuBuildShmemBackendMemProps(virDomainShmemDefPtr shmem) +{ + char *mem_path = NULL; + virJSONValuePtr ret = NULL; + + if (virAsprintf(&mem_path, "/dev/shm/%s", shmem->name) < 0) + return NULL; + + virJSONValueObjectCreate(&ret, + "s:mem-path", mem_path, + "U:size", shmem->size, + NULL);

+ + VIR_FREE(mem_path); + return ret; +} + + +static char * +qemuBuildShmemBackendMemStr(virDomainShmemDefPtr shmem) +{ + char *ret = NULL; + char *alias = NULL; + virJSONValuePtr props = qemuBuildShmemBackendMemProps(shmem); + + if (!props) + return NULL; + + if (virAsprintf(&alias, "shmmem-%s", shmem->info.alias) < 0) + goto cleanup; + + ret = virQEMUBuildObjectCommandlineFromJSON("memory-backend-file", + alias, + props); + cleanup: + VIR_FREE(alias); + virJSONValueFree(props); + + return ret; +} + + static int qemuBuildShmemCommandLine(virLogManagerPtr logManager, virCommandPtr cmd, @@ -8518,10 +8595,15 @@ qemuBuildShmemCommandLine(virLogManagerPtr logManager, break;

case VIR_DOMAIN_SHMEM_MODEL_IVSHMEM_PLAIN: + if (!(devstr = qemuBuildShmemBackendMemStr(shmem))) + return -1; + + virCommandAddArgList(cmd, "-object", devstr, NULL); + VIR_FREE(devstr); + + /* fall-through */ case VIR_DOMAIN_SHMEM_MODEL_IVSHMEM_DOORBELL: - virReportError(VIR_ERR_CONFIG_UNSUPPORTED, - _("%s device is not supported with this QEMU binary"), - virDomainShmemModelTypeToString(shmem->model)); + devstr = qemuBuildShmemDevStr(def, shmem, qemuCaps); break; case VIR_DOMAIN_SHMEM_MODEL_LAST: diff --git a/src/qemu/qemu_command.h b/src/qemu/qemu_command.h index 2f2a6ff877e7..facc833bf886 100644 --- a/src/qemu/qemu_command.h +++ b/src/qemu/qemu_command.h @@ -186,4 +186,14 @@ bool qemuCheckCCWS390AddressSupport(const virDomainDef *def, virJSONValuePtr qemuBuildHotpluggableCPUProps(const virDomainVcpuDef *vcpu) ATTRIBUTE_NONNULL(1); +virJSONValuePtr qemuBuildShmemBackendMemProps(virDomainShmemDefPtr shmem) + ATTRIBUTE_NONNULL(1); + +char *qemuBuildShmemDevStr(virDomainDefPtr def, + virDomainShmemDefPtr shmem, + virQEMUCapsPtr qemuCaps) + ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3); + + + #endif /* __QEMU_COMMAND_H__*/ diff --git a/tests/qemuxml2argvdata/qemuxml2argv-shmem-plain-doorbell.args b/tests/qemuxml2argvdata/qemuxml2argv-shmem-plain-doorbell.args new file mode 100644 index 000000000000..7abc7f8c4be5 --- /dev/null +++ b/tests/qemuxml2argvdata/qemuxml2argv-shmem-plain-doorbell.args @@ -0,0 +1,43 @@ +LC_ALL=C \ +PATH=/bin \ +HOME=/home/test \ +USER=test \ +LOGNAME=test \ +QEMU_AUDIO_DRV=none \ +/usr/bin/qemu \ +-name QEMUGuest1 \ +-S \ +-M pc \ +-m 214 \ +-smp 1,sockets=1,cores=1,threads=1 \ +-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \ +-nographic \ +-nodefaults \ +-monitor unix:/tmp/lib/domain--1-QEMUGuest1/monitor.sock,server,nowait \ +-no-acpi \ +-boot c \ +-usb \ +-object memory-backend-file,id=shmmem-shmem0,mem-path=/dev/shm/shmem0,\ +size=4194304 \ +-device ivshmem-plain,id=shmem0,memdev=shmmem-shmem0,bus=pci.0,addr=0x3 \ +-object memory-backend-file,id=shmmem-shmem1,mem-path=/dev/shm/shmem1,\ +size=134217728 \ +-device ivshmem-plain,id=shmem1,memdev=shmmem-shmem1,bus=pci.0,addr=0x5 \ +-object memory-backend-file,id=shmmem-shmem2,mem-path=/dev/shm/shmem2,\ +size=268435456 \ +-device ivshmem-plain,id=shmem2,memdev=shmmem-shmem2,bus=pci.0,addr=0x4 \ +-device ivshmem-doorbell,id=shmem3,chardev=charshmem3,ioeventfd=on,bus=pci.0,\ +addr=0x6 \ +-chardev socket,id=charshmem3,path=/var/lib/libvirt/shmem-shmem3-sock \ +-device ivshmem-doorbell,id=shmem4,chardev=charshmem4,ioeventfd=on,bus=pci.0,\ +addr=0x7 \ +-chardev socket,id=charshmem4,path=/tmp/shmem4-sock \ +-device ivshmem-doorbell,id=shmem5,chardev=charshmem5,ioeventfd=off,bus=pci.0,\ +addr=0x8 \ +-chardev socket,id=charshmem5,path=/tmp/shmem5-sock \ +-device ivshmem-doorbell,id=shmem6,chardev=charshmem6,vectors=16,ioeventfd=on,\ +bus=pci.0,addr=0x9 \ +-chardev socket,id=charshmem6,path=/tmp/shmem6-sock \ +-device ivshmem-doorbell,id=shmem7,chardev=charshmem7,vectors=32,ioeventfd=on,\ +bus=pci.0,addr=0xa \ +-chardev socket,id=charshmem7,path=/tmp/shmem7-sock diff --git a/tests/qemuxml2argvdata/qemuxml2argv-shmem-plain-doorbell.xml b/tests/qemuxml2argvdata/qemuxml2argv-shmem-plain-doorbell.xml new file mode 100644 index 000000000000..0e10ce31fb1a --- /dev/null +++ b/tests/qemuxml2argvdata/qemuxml2argv-shmem-plain-doorbell.xml @@ -0,0 +1,63 @@ +<domain type='qemu'> + <name>QEMUGuest1</name> + <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid> + <memory unit='KiB'>219136</memory> + <currentMemory unit='KiB'>219136</currentMemory> + <vcpu placement='static'>1</vcpu> + <os> + <type arch='i686' machine='pc'>hvm</type> + <boot dev='hd'/> + </os> + <clock offset='utc'/> + <on_poweroff>destroy</on_poweroff> + <on_reboot>restart</on_reboot> + <on_crash>destroy</on_crash> + <devices> + <emulator>/usr/bin/qemu</emulator> + <controller type='usb' index='0'/> + <controller type='pci' index='0' model='pci-root'/> + <input type='mouse' bus='ps2'/> + <input type='keyboard' bus='ps2'/> + <memballoon model='none'/> + <shmem name='shmem0'> + <model type='ivshmem-plain'/> + </shmem> + <shmem name='shmem1'> + <model type='ivshmem-plain'/> + <size unit='M'>128</size> + </shmem> + <shmem name='shmem2'> + <model type='ivshmem-plain'/> + <size unit='M'>256</size> + <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> + </shmem> + <shmem name='shmem3'> + <model type='ivshmem-doorbell'/> + <size unit='M'>512</size> + <server/> + </shmem> + <shmem name='shmem4'> + <model type='ivshmem-doorbell'/> + <size unit='M'>1024</size> + <server path='/tmp/shmem4-sock'/> + </shmem> + <shmem name='shmem5'> + <model type='ivshmem-doorbell'/> + <size unit='M'>2048</size> + <server path='/tmp/shmem5-sock'/> + <msi ioeventfd='off'/> + </shmem> + <shmem name='shmem6'> + <model type='ivshmem-doorbell'/> + <size unit='M'>4096</size> + <server path='/tmp/shmem6-sock'/> + <msi vectors='16'/> + </shmem> + <shmem name='shmem7'> + <model type='ivshmem-doorbell'/> + <size unit='M'>8192</size> + <server path='/tmp/shmem7-sock'/> + <msi vectors='32' ioeventfd='on'/> + </shmem> + </devices> +</domain> diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c index 0af71a1dbce5..03e3ca746f14 100644 --- a/tests/qemuxml2argvtest.c +++ b/tests/qemuxml2argvtest.c @@ -2020,6 +2020,9 @@ mymain(void) DO_TEST("fips-enabled", QEMU_CAPS_ENABLE_FIPS); DO_TEST("shmem", QEMU_CAPS_DEVICE_IVSHMEM); + DO_TEST("shmem-plain-doorbell", QEMU_CAPS_DEVICE_IVSHMEM, + QEMU_CAPS_DEVICE_IVSHMEM_PLAIN, + QEMU_CAPS_DEVICE_IVSHMEM_DOORBELL); DO_TEST_FAILURE("shmem", NONE); DO_TEST_FAILURE("shmem-invalid-size", QEMU_CAPS_DEVICE_IVSHMEM);