December 2019 - Devel - libvirt List Archives

[libvirt] [PATCH 0/4] drop usage of c-strcase gnulib module
by Pavel Hrdina 09 Dec '19

09 Dec '19

Pavel Hrdina (4): use g_ascii_strcasecmp instead of c_strcasecmp from gnulib use g_ascii_strncasecmp instead of c_strncasecmp from gnulib syntax-check: update strcase check to refer to GLib bootstrap.conf: drop usage of c-strcase gnulib module bootstrap.conf | 1 - build-aux/syntax-check.mk | 2 +- src/internal.h | 11 +++++------ tests/virhashtest.c | 2 +- 4 files changed, 7 insertions(+), 9 deletions(-) -- 2.23.0

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[libvirt] [PATCH 0/8] qemu: Fix non-shared storage migration over NBD (blockdev-add sequels)
by Peter Krempa 06 Dec '19

06 Dec '19

I put some blockdev awareness into the non-shared storage migration NBD code but it was not complete. Seeing it there mislead me thinking that it's done. Fix it now. Peter Krempa (8): qemu: migration: Simplify handling of 'diskAlias' when adding NBD exports qemu: migration: Properly export backend for NBD storage migration qemu: migration: Access job name from job struct qemu: migration: Simplify cleanup in qemuMigrationSrcNBDCopyCancelOne qemu: blockjob: Allow NULL 'mirror' for block copy jobs due to migration qemu: migration: Split out setup of the migration target qemu: migration: Mention disk target rather than the drive name in debug msg qemu: migration: Properly setup mirror for blockdev configurations src/qemu/qemu_blockjob.c | 11 +++- src/qemu/qemu_migration.c | 115 ++++++++++++++++++++++++-------------- 2 files changed, 80 insertions(+), 46 deletions(-) -- 2.23.0

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Re: [libvirt] [PATCH for-4.2?] block/qcow2-bitmap: fix crash bug in qcow2_co_remove_persistent_dirty_bitmap
by Eric Blake 06 Dec '19

06 Dec '19

On 12/5/19 1:30 PM, Vladimir Sementsov-Ogievskiy wrote: > Here is double bug: > > First, return error but not set errp. This may lead to: > qmp block-dirty-bitmap-remove may report success when actually failed > > block-dirty-bitmap-remove used in a transaction will crash, as > qmp_transaction will think that it returned success and will cal call > block_dirty_bitmap_remove_commit which will crash, as state->bitmap is > NULL > > Second (like in anecdote), this case is not an error at all. As it is > documented in the comment above bdrv_co_remove_persistent_dirty_bitmap > definition, absence of bitmap is not an error, and similar case handled > at start of qcow2_co_remove_persistent_dirty_bitmap, it returns 0 when > there is no bitmaps at all.. double . > > But when there are some bitmaps, but not the requested one, it return > error with errp unset. > > Fix that. > > Fixes: b56a1e31759b750 > Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov(a)virtuozzo.com> > --- > > Hi all! > > Ohm, suddenly we faced this bug. It's a regression in 4.2. I'm very > sorry for introducing it, and it sad that it's found so late.. > > Personally, I think that this one worth rc5, as it makes new bitmap > interfaces unusable. But the decision is yours. > > Last minute edit: hmm, actually, transaction action introduced in > 4.2, so crash is not a regression, only broken block-dirty-bitmap-remove > command is a regression... Maybe it's OK for stable. Libvirt REALLY wants to use transaction bitmap management (and require qemu 4.2) for its incremental backup patches that Peter is almost ready to merge in. I'm trying to ascertain: When exactly can this bug hit? Can you give a sequence of QMP commands that will trigger it for easy reproduction? Are there workarounds (such as checking that a bitmap exists prior to attempting to remove it)? If it does NOT get fixed in rc5, how will libvirt be able to probe whether the fix is in place? > > block/qcow2-bitmap.c | 9 ++++++--- > 1 file changed, 6 insertions(+), 3 deletions(-) > > diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c > index 8abaf632fc..c6c8ebbe89 100644 > --- a/block/qcow2-bitmap.c > +++ b/block/qcow2-bitmap.c > @@ -1469,8 +1469,10 @@ int coroutine_fn qcow2_co_remove_persistent_dirty_bitmap(BlockDriverState *bs, > Qcow2BitmapList *bm_list; > > if (s->nb_bitmaps == 0) { > - /* Absence of the bitmap is not an error: see explanation above > - * bdrv_remove_persistent_dirty_bitmap() definition. */ > + /* > + * Absence of the bitmap is not an error: see explanation above > + * bdrv_co_remove_persistent_dirty_bitmap() definition. > + */ > return 0; > } > > @@ -1485,7 +1487,8 @@ int coroutine_fn qcow2_co_remove_persistent_dirty_bitmap(BlockDriverState *bs, > > bm = find_bitmap_by_name(bm_list, name); > if (bm == NULL) { > - ret = -EINVAL; > + /* Absence of the bitmap is not an error, see above. */ > + ret = 0; > goto out; > } > > -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3226 Virtualization: qemu.org | libvirt.org

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[libvirt] Offline manipulation of Dirty Bitmaps by qemu-img
by John Snow 06 Dec '19

06 Dec '19

This has come up in the past, and I believe we discussed this at KVM Forum, too: There have been requests from oVirt (via Nir Soffer) to add some offline bitmap manipulation functionality. In the past, our stance has generally been "Use QEMU without an accelerator, and use QMP to manipulate the images." We like this for a few reasons: 1. It keeps bitmap management code tightly centralized 2. It allows for the full suite of bitmap manipulations in either offline or online mode with one tool 3. We wouldn't have to write new code. 4. Or design new CLIs and duplicate our existing work. 5. Or write even more tests. However, tools like oVirt may or may not be fully equipped to launch QEMU in this context, and there is always a desire for qemu-img to be able to "do more", so existing management suites could extend functionality more easily. (Or so I am imagining.) I am still leaning heavily against adding any more CLI commands or options to qemu-img right now. Even if we do add some of the fundamental ones like "add" or "remove", it seems only a matter of time before we have to add "clear", "merge", etc. Is this just a race to code duplication? On the other hand, one of the other suggestions is to have qemu-img check --repair optionally delete corrupted bitmaps. I kind of like this idea: it's a buyer beware operation that might make management layers unhappy, but then again ... repair is always something that could make things worse. Plus, if you manage to corrupt bitmaps badly enough that they can't even be parsed, you might need a heavyweight repair operation. Nir, do you think that'd be sufficient for your needs for now, or would you still like to see more granular offline management? --js

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[libvirt] [PATCH 0/3] qemu: fix setting of block job speed (blockdev-add sequels)
by Peter Krempa 06 Dec '19

06 Dec '19

See patch 3. Peter Krempa (3): qemu: domain: Mention searched disk in error of qemuDomainDiskByName qemu: driver: Use qemuDomainDiskByName instead of virDomainDiskByName qemu: driver: Use appropriate job name when setting blockjob speed src/qemu/qemu_domain.c | 4 ++-- src/qemu/qemu_driver.c | 20 ++++++++------------ 2 files changed, 10 insertions(+), 14 deletions(-) -- 2.23.0

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[libvirt] [PATCH] qemu: remove nested branching to enhance readability
by Pavel Mores 06 Dec '19

06 Dec '19

This is a follow-up to patch series posted in https://www.redhat.com/archives/libvir-list/2019-November/msg01180.html It implements a suggestion made by Cole in https://www.redhat.com/archives/libvir-list/2019-November/msg01207.html and discussed in follow-up messages as there were no objections to the change. The aim is to make the code more readable by replacing nested branching with a flat structure. Signed-off-by: Pavel Mores <pmores(a)redhat.com> --- src/qemu/qemu_domain.c | 19 ++++++++----------- 1 file changed, 8 insertions(+), 11 deletions(-) diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c index d1596a28ca..5e4eede3c2 100644 --- a/src/qemu/qemu_domain.c +++ b/src/qemu/qemu_domain.c @@ -7914,19 +7914,16 @@ static int qemuDomainDefaultVideoDevice(const virDomainDef *def, virQEMUCapsPtr qemuCaps) { - if (ARCH_IS_PPC64(def->os.arch)) { + if (ARCH_IS_PPC64(def->os.arch)) return VIR_DOMAIN_VIDEO_TYPE_VGA; - } else if (qemuDomainIsARMVirt(def) || - qemuDomainIsRISCVVirt(def) || - ARCH_IS_S390(def->os.arch)) { + if (qemuDomainIsARMVirt(def) || qemuDomainIsRISCVVirt(def) || + ARCH_IS_S390(def->os.arch)) return VIR_DOMAIN_VIDEO_TYPE_VIRTIO; - } else { - if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_CIRRUS_VGA)) - return VIR_DOMAIN_VIDEO_TYPE_CIRRUS; - if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_VGA)) - return VIR_DOMAIN_VIDEO_TYPE_VGA; - return VIR_DOMAIN_VIDEO_TYPE_DEFAULT; - } + if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_CIRRUS_VGA)) + return VIR_DOMAIN_VIDEO_TYPE_CIRRUS; + if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_DEVICE_VGA)) + return VIR_DOMAIN_VIDEO_TYPE_VGA; + return VIR_DOMAIN_VIDEO_TYPE_DEFAULT; } -- 2.21.0

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[libvirt] [PATCH 0/4] Introduce VIR_MIGRATE_PARAM_TLS_DESTINATION migration param
by Jiri Denemark 06 Dec '19

06 Dec '19

Normally the TLS certificate from the destination host must match the host's name for TLS verification to succeed. When the certificate does not match the destination hostname and the expected cetificate's hostname is known, this parameter can be used to pass this expected hostname when starting the migration. Jiri Denemark (4): qemu: Add support for setting string migration params Introduce VIR_MIGRATE_PARAM_TLS_DESTINATION migration param qemu: Implement VIR_MIGRATE_PARAM_TLS_DESTINATION virsh: Add --tls-destination option for migrate command include/libvirt/libvirt-domain.h | 14 +++++++ src/qemu/qemu_migration.h | 1 + src/qemu/qemu_migration_params.c | 65 +++++++++++++++++++++++++++++++- tools/virsh-domain.c | 11 ++++++ tools/virsh.pod | 8 +++- 5 files changed, 96 insertions(+), 3 deletions(-) -- 2.24.0

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[libvirt] [PATCH 0/3] Remove deprecated pc-0.x machine types and related hacks
by Thomas Huth 06 Dec '19

06 Dec '19

These have been on the deprecation list since a year now, so it's time to finally remove the pc-0.x machine types. We then can also remove some compatibility hacks in the devices, i.e. the "use_broken_id" in ac97 and "command_serr_enable" in PCI devices. Note that there is also the "rombar" property of the PCI devices which is now not required for the x86 machine types anymore. But it seems to me like this is still used by various people to bypass the ROM loading for PCI devices in certain cases, so I did not remove that property here yet. Thomas Huth (3): hw/i386: Remove the deprecated machines 0.12 up to 0.15 hw/audio: Remove the "use_broken_id" hack from the AC97 device hw/pci: Remove the "command_serr_enable" property hw/audio/ac97.c | 9 ----- hw/i386/pc_piix.c | 82 ------------------------------------------- hw/pci/pci.c | 6 +--- include/hw/pci/pci.h | 3 -- qemu-deprecated.texi | 2 +- tests/cpu-plug-test.c | 6 +--- 6 files changed, 3 insertions(+), 105 deletions(-) -- 2.18.1

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[libvirt] [PATCH] qemu_monitor_text: Drop unused variable and avoid crash
by Michal Privoznik 06 Dec '19

06 Dec '19

In v5.8.0-rc1~122 we've removed the only use of @safename in qemuMonitorTextLoadSnapshot(). What we are left with is an declared but not initialized variable that is passed to VIR_FREE(). Caught by libvirt-php test suite. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com> --- Pushed under trivial rule. src/qemu/qemu_monitor_text.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/src/qemu/qemu_monitor_text.c b/src/qemu/qemu_monitor_text.c index 9054682d60..b387235821 100644 --- a/src/qemu/qemu_monitor_text.c +++ b/src/qemu/qemu_monitor_text.c @@ -161,7 +161,6 @@ int qemuMonitorTextLoadSnapshot(qemuMonitorPtr mon, const char *name) char *cmd = NULL; char *reply = NULL; int ret = -1; - char *safename; cmd = g_strdup_printf("loadvm \"%s\"", name); @@ -194,7 +193,6 @@ int qemuMonitorTextLoadSnapshot(qemuMonitorPtr mon, const char *name) ret = 0; cleanup: - VIR_FREE(safename); VIR_FREE(cmd); VIR_FREE(reply); return ret; -- 2.23.0

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[libvirt] [PATCH] news: Update the qemu version that dedicated performance hint is from
by Han Han 06 Dec '19

06 Dec '19

KVM dedicated performance hint is added since qemu version 2.10.0 not 2.10.1. Signed-off-by: Han Han <hhan(a)redhat.com> --- docs/news.xml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/docs/news.xml b/docs/news.xml index 2eb3bfdf6e..3ddebfddfb 100644 --- a/docs/news.xml +++ b/docs/news.xml @@ -469,7 +469,7 @@ With <code><hint-dedicated state='on'/></code> and <code><cpu mode='host-passthrough'/></code>, it allows a guest to enable optimizations when running on dedicated - vCPUs. QEMU newer than 2.12.1 and kernel newer than 4.17 + vCPUs. QEMU newer than 2.12.0 and kernel newer than 4.17 are required. </description> </change> -- 2.24.0.rc1

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