Re: [libvirt] [PATCH v3 2/2] qemu: Add support to QXL's max_outputs parameter

Historically, we added heads=1 to videos, but for example for qxl, we did not reflect that on the command line. Implementing that now could mean that if user were to migrate from older to newer libvirt, the command-line for qemu would differ. In order for that not to happen a migration cookie flag is introduced. Signed-off-by: Martin Kletzander <mkletzan(a)redhat.com&gt; --- src/qemu/qemu_command.c | 8 +++ src/qemu/qemu_migration.c | 64 ++++++++++++++++++++-- .../qemuxml2argv-video-qxl-heads.args | 28 ++++++++++ .../qemuxml2argv-video-qxl-heads.xml | 47 ++++++++++++++++ tests/qemuxml2argvtest.c | 8 +++ .../qemuxml2xmlout-video-qxl-heads.xml | 47 ++++++++++++++++ tests/qemuxml2xmltest.c | 2 + 7 files changed, 198 insertions(+), 6 deletions(-) create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-video-qxl-heads.args create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-video-qxl-heads.xml create mode 100644 tests/qemuxml2xmloutdata/qemuxml2xmlout-video-qxl-heads.xml diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c index 0331789b6b59..f6b102e96bb2 100644 --- a/src/qemu/qemu_command.c +++ b/src/qemu/qemu_command.c @@ -3985,6 +3985,14 @@ qemuBuildDeviceVideoStr(const virDomainDef *def, /* QEMU accepts mebibytes for vgamem_mb. */ virBufferAsprintf(&buf, ",vgamem_mb=%u", video->vgamem / 1024); } + + if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_QXL_VGA_MAX_OUTPUTS) && + virQEMUCapsGet(qemuCaps, QEMU_CAPS_QXL_MAX_OUTPUTS)) {

+ if (video->heads) + virBufferAsprintf(&buf, ",max_outputs=%u", video->heads); + } else { + video->heads = 0; + }

} else if (video->vram && ((video->type == VIR_DOMAIN_VIDEO_TYPE_VGA && virQEMUCapsGet(qemuCaps, QEMU_CAPS_VGA_VGAMEM)) || diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c index 8bc76bf1671d..f83b6362d228 100644 --- a/src/qemu/qemu_migration.c +++ b/src/qemu/qemu_migration.c @@ -87,6 +87,7 @@ enum qemuMigrationCookieFlags { QEMU_MIGRATION_COOKIE_FLAG_NBD, QEMU_MIGRATION_COOKIE_FLAG_STATS, QEMU_MIGRATION_COOKIE_FLAG_MEMORY_HOTPLUG, + QEMU_MIGRATION_COOKIE_FLAG_VIDEO_HEADS, QEMU_MIGRATION_COOKIE_FLAG_LAST }; @@ -100,7 +101,8 @@ VIR_ENUM_IMPL(qemuMigrationCookieFlag, "network", "nbd", "statistics", - "memory-hotplug"); + "memory-hotplug", + "video-heads"); enum qemuMigrationCookieFeatures { QEMU_MIGRATION_COOKIE_GRAPHICS = (1 << QEMU_MIGRATION_COOKIE_FLAG_GRAPHICS), @@ -110,6 +112,7 @@ enum qemuMigrationCookieFeatures { QEMU_MIGRATION_COOKIE_NBD = (1 << QEMU_MIGRATION_COOKIE_FLAG_NBD), QEMU_MIGRATION_COOKIE_STATS = (1 << QEMU_MIGRATION_COOKIE_FLAG_STATS), QEMU_MIGRATION_COOKIE_MEMORY_HOTPLUG = (1 << QEMU_MIGRATION_COOKIE_FLAG_MEMORY_HOTPLUG), + QEMU_MIGRATION_COOKIE_VIDEO_HEADS = (1 << QEMU_MIGRATION_COOKIE_FLAG_VIDEO_HEADS), }; typedef struct _qemuMigrationCookieGraphics qemuMigrationCookieGraphics; @@ -1386,6 +1389,9 @@ qemuMigrationBakeCookie(qemuMigrationCookiePtr mig, if (flags & QEMU_MIGRATION_COOKIE_MEMORY_HOTPLUG) mig->flagsMandatory |= QEMU_MIGRATION_COOKIE_MEMORY_HOTPLUG; + if (flags & QEMU_MIGRATION_COOKIE_VIDEO_HEADS) + mig->flagsMandatory |= QEMU_MIGRATION_COOKIE_VIDEO_HEADS; + if (!(*cookieout = qemuMigrationCookieXMLFormatStr(driver, mig))) return -1; @@ -3091,6 +3097,7 @@ qemuMigrationBeginPhase(virQEMUDriverPtr driver, qemuDomainObjPrivatePtr priv = vm->privateData; virCapsPtr caps = NULL; unsigned int cookieFlags = QEMU_MIGRATION_COOKIE_LOCKSTATE; + size_t i = 0, j = 0; VIR_DEBUG("driver=%p, vm=%p, xmlin=%s, dname=%s," " cookieout=%p, cookieoutlen=%p," @@ -3131,8 +3138,6 @@ qemuMigrationBeginPhase(virQEMUDriverPtr driver, if (nmigrate_disks) { if (has_drive_mirror) { - size_t i, j; -

/* Check user requested only known disk targets. */ for (i = 0; i < nmigrate_disks; i++) { for (j = 0; j < vm->def->ndisks; j++) { @@ -3177,6 +3182,27 @@ qemuMigrationBeginPhase(virQEMUDriverPtr driver, vm->newDef && virDomainDefHasMemoryHotplug(vm->newDef))) cookieFlags |= QEMU_MIGRATION_COOKIE_MEMORY_HOTPLUG; + /* + * If there is at least one QXL video with number of heads + * defined, we need to indicate that we now know how to + * properly specify that on the command-line. Destination + * that cannot do this will properly block such migration and + * new enough destination will know that the value can be kept + * and not reset. + */ + if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_QXL_MAX_OUTPUTS) && + virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_QXL_VGA_MAX_OUTPUTS)) { + for (i = 0; i < vm->def->nvideos; i++) { + virDomainVideoDefPtr vid = vm->def->videos[i]; + + if (vid->type == VIR_DOMAIN_VIDEO_TYPE_QXL && + vid->heads) { + cookieFlags |= QEMU_MIGRATION_COOKIE_VIDEO_HEADS; + break; + } + } + } + if (!(mig = qemuMigrationEatCookie(driver, vm, NULL, 0, 0))) goto cleanup; @@ -3404,6 +3430,32 @@ qemuMigrationPrepareIncoming(virDomainObjPtr vm, } static int +qemuMigratePrepareDomain(virConnectPtr dconn, + virQEMUDriverPtr driver, + virDomainObjPtr vm, + qemuMigrationCookiePtr mig) +{ + size_t i = 0; + + if (!(mig->flags & QEMU_MIGRATION_COOKIE_VIDEO_HEADS)) { + /* + * Source didn't know how to properly specify number of heads + * for QXL video, so in order to migrate with ABI kept, leave + * the value unspecified. + */ + for (i = 0; i < vm->def->nvideos; i++) { + virDomainVideoDefPtr vid = vm->def->videos[i]; + + if (vid->type == VIR_DOMAIN_VIDEO_TYPE_QXL) + vid->heads = 0; + } + } + + return qemuProcessPrepareDomain(dconn, driver, vm, + VIR_QEMU_PROCESS_START_AUTODESTROY); +} + +static int qemuMigrationPrepareAny(virQEMUDriverPtr driver, virConnectPtr dconn, const char *cookiein, @@ -3546,7 +3598,8 @@ qemuMigrationPrepareAny(virQEMUDriverPtr driver, if (!(mig = qemuMigrationEatCookie(driver, vm, cookiein, cookieinlen, QEMU_MIGRATION_COOKIE_LOCKSTATE | QEMU_MIGRATION_COOKIE_NBD | - QEMU_MIGRATION_COOKIE_MEMORY_HOTPLUG))) + QEMU_MIGRATION_COOKIE_MEMORY_HOTPLUG | + QEMU_MIGRATION_COOKIE_VIDEO_HEADS))) goto cleanup; if (STREQ_NULLABLE(protocol, "rdma") && @@ -3590,8 +3643,7 @@ qemuMigrationPrepareAny(virQEMUDriverPtr driver, goto stopjob; dataFD[0] = -1; /* the FD is now owned by incoming */ - if (qemuProcessPrepareDomain(dconn, driver, vm, - VIR_QEMU_PROCESS_START_AUTODESTROY) < 0) + if (qemuMigratePrepareDomain(dconn, driver, vm, mig) < 0) goto stopjob; if (qemuProcessPrepareHost(driver, vm, !!incoming) < 0) diff --git a/tests/qemuxml2argvdata/qemuxml2argv-video-qxl-heads.args b/tests/qemuxml2argvdata/qemuxml2argv-video-qxl-heads.args new file mode 100644 index 000000000000..a939177088f9 --- /dev/null +++ b/tests/qemuxml2argvdata/qemuxml2argv-video-qxl-heads.args @@ -0,0 +1,28 @@ +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 \ +-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \ +-nographic \ +-nodefaults \ +-monitor unix:/tmp/lib/domain--1-QEMUGuest1/monitor.sock,server,nowait \ +-no-acpi \ +-boot c \ +-usb \ +-drive file=/dev/HostVG/QEMUGuest1,format=raw,if=none,id=drive-ide0-0-0 \ +-device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 \ +-device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,max_outputs=1,\ +bus=pci.0,addr=0x2 \ +-device qxl,id=video1,ram_size=67108864,vram_size=33554432,max_outputs=3,\ +bus=pci.0,addr=0x4 \ +-device qxl,id=video2,ram_size=67108864,vram_size=67108864,max_outputs=7,\ +bus=pci.0,addr=0x5 \ +-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3 diff --git a/tests/qemuxml2argvdata/qemuxml2argv-video-qxl-heads.xml b/tests/qemuxml2argvdata/qemuxml2argv-video-qxl-heads.xml new file mode 100644 index 000000000000..45d08745e652 --- /dev/null +++ b/tests/qemuxml2argvdata/qemuxml2argv-video-qxl-heads.xml @@ -0,0 +1,47 @@ +<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> + <disk type='block' device='disk'> + <source dev='/dev/HostVG/QEMUGuest1'/> + <target dev='hda' bus='ide'/> + <address type='drive' controller='0' bus='0' target='0' unit='0'/> + </disk> + <controller type='usb' index='0'> + <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/> + </controller> + <controller type='ide' index='0'> + <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> + </controller> + <controller type='pci' index='0' model='pci-root'/> + <input type='mouse' bus='ps2'/> + <input type='keyboard' bus='ps2'/> + <video> + <model type='qxl' ram='65536' vram='32768' vgamem='8192' heads='3'/> + <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/> + </video> + <video> + <model type='qxl' ram='65536' vram='65536' vgamem='8192' heads='7'/> + <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/> + </video> + <video> + <model type='qxl' ram='65536' vram='65536' vgamem='8192' heads='1' primary='yes'/> + <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> + </video>