libvirt-9.3.0-2.el9
- qemu_domin: Account for NVMe disks when calculating memlock limit on hotplug (rhbz#2014030) Resolves: rhbz#2014030
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Jiri Denemark
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2998337a79
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8e2d2a718e
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From d6fb700653000794c898517db6953b90b580af09 Mon Sep 17 00:00:00 2001
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Message-Id: <d6fb700653000794c898517db6953b90b580af09@dist-git>
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From: Michal Privoznik <mprivozn@redhat.com>
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Date: Tue, 9 May 2023 13:19:12 +0300
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Subject: [PATCH] qemu_domin: Account for NVMe disks when calculating memlock
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limit on hotplug
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During hotplug of a NVMe disk we need to adjust the memlock
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limit. The computation of the limit is handled by
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qemuDomainGetMemLockLimitBytes() which looks at given domain
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definition and accounts for various device types (as different
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types require different amounts). But during disk hotplug the
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disk is not added to domain definition until the very last
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moment. Therefore, qemuDomainGetMemLockLimitBytes() has this
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@forceVFIO argument which tells it to assume VFIO even if there
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are no signs of VFIO in domain definition. And this kind of
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works, until the amount needed for NVMe disks changed (in
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v9.3.0-rc1~52). What's missing in the commit is making @forceVFIO
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behave the same as if there was an NVMe disk present in the
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domain definition.
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But, we can do even better - just mimic whatever we're doing for
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hostdevs. IOW - introduce qemuDomainAdjustMaxMemLockNVMe() that
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behaves the same as qemuDomainAdjustMaxMemLockHostdev().
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There are subtle differences though:
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1) qemuDomainAdjustMaxMemLockHostdev() can afford placing hostdev
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right at the end of vm->def->hostdevs, because the array was
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already reallocated (at the beginning of
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qemuDomainAttachHostPCIDevice()). But
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qemuDomainAdjustMaxMemLockNVMe() doesn't have that luxury.
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2) qemuDomainAdjustMaxMemLockHostdev() places a
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virDomainHostdevDef pointer into domain definition, while
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qemuDomainStorageSourceAccessModifyNVMe() (which calls
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qemuDomainAdjustMaxMemLock()) sees a virStorageSource pointer
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but domain definition contains virDomainDiskDef. But that's
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okay, we can create a dummy disk definition and append it into
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the domain definition.
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After this, qemuDomainAdjustMaxMemLock() can be called with
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@forceVFIO = false, as the disk is now part of domain definition
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(when computing the new limit).
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Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2014030#c28
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Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
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Reviewed-by: Martin Kletzander <mkletzan@redhat.com>
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(cherry picked from commit c925bb927327c6f23864348286d931a25fbd13a3)
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https://bugzilla.redhat.com/show_bug.cgi?id=2014030
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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
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---
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src/qemu/qemu_domain.c | 35 ++++++++++++++++++++++++++++++++++-
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src/qemu/qemu_domain.h | 3 +++
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2 files changed, 37 insertions(+), 1 deletion(-)
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diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
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index d556e2186c..b5b4184782 100644
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--- a/src/qemu/qemu_domain.c
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+++ b/src/qemu/qemu_domain.c
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@@ -8026,7 +8026,7 @@ qemuDomainStorageSourceAccessModifyNVMe(virQEMUDriver *driver,
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goto revoke;
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}
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- if (qemuDomainAdjustMaxMemLock(vm, true) < 0)
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+ if (qemuDomainAdjustMaxMemLockNVMe(vm, src) < 0)
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goto revoke;
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revoke_maxmemlock = true;
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@@ -9779,6 +9779,39 @@ qemuDomainAdjustMaxMemLockHostdev(virDomainObj *vm,
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}
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+/**
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+ * qemuDomainAdjustMaxMemLockNVMe:
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+ * @vm: domain object
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+ * @src: disk source
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+ *
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+ * Temporarily add the disk source to the domain definition,
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+ * adjust the max memlock based in this new definition and
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+ * restore the original definition.
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+ *
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+ * Returns: 0 on success,
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+ * -1 on failure.
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+ */
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+int
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+qemuDomainAdjustMaxMemLockNVMe(virDomainObj *vm,
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+ virStorageSource *src)
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+{
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+ g_autofree virDomainDiskDef *disk = NULL;
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+ int ret = 0;
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+
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+ disk = g_new0(virDomainDiskDef, 1);
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+ disk->src = src;
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+
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+ VIR_APPEND_ELEMENT_COPY(vm->def->disks, vm->def->ndisks, disk);
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+
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+ if (qemuDomainAdjustMaxMemLock(vm, false) < 0)
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+ ret = -1;
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+
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+ VIR_DELETE_ELEMENT_INPLACE(vm->def->disks, vm->def->ndisks - 1, vm->def->ndisks);
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+
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+ return ret;
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+}
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+
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+
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/**
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* qemuDomainHasVcpuPids:
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* @vm: Domain object
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diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h
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index eaa75de3e5..ee2ddda079 100644
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--- a/src/qemu/qemu_domain.h
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+++ b/src/qemu/qemu_domain.h
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@@ -41,6 +41,7 @@
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#include "virdomainmomentobjlist.h"
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#include "virenum.h"
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#include "vireventthread.h"
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+#include "storage_source_conf.h"
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#define QEMU_DOMAIN_FORMAT_LIVE_FLAGS \
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(VIR_DOMAIN_XML_SECURE)
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@@ -859,6 +860,8 @@ int qemuDomainAdjustMaxMemLock(virDomainObj *vm,
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bool forceVFIO);
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int qemuDomainAdjustMaxMemLockHostdev(virDomainObj *vm,
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virDomainHostdevDef *hostdev);
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+int qemuDomainAdjustMaxMemLockNVMe(virDomainObj *vm,
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+ virStorageSource *src);
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int qemuDomainSetMaxMemLock(virDomainObj *vm,
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unsigned long long limit,
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unsigned long long *origPtr);
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--
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2.40.1
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@ -229,7 +229,7 @@
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Summary: Library providing a simple virtualization API
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Name: libvirt
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Version: 9.3.0
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Release: 1%{?dist}%{?extra_release}
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Release: 2%{?dist}%{?extra_release}
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License: GPL-2.0-or-later AND LGPL-2.1-only AND LGPL-2.1-or-later AND OFL-1.1
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URL: https://libvirt.org/
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@ -238,6 +238,8 @@ URL: https://libvirt.org/
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%endif
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Source: https://download.libvirt.org/%{?mainturl}libvirt-%{version}.tar.xz
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Source1: symlinks
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Patch1: libvirt-qemu_domin-Account-for-NVMe-disks-when-calculating-memlock-limit-on-hotplug.patch
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Requires: libvirt-daemon = %{version}-%{release}
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Requires: libvirt-daemon-config-network = %{version}-%{release}
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@ -2472,6 +2474,9 @@ exit 0
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%endif
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%changelog
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* Tue May 16 2023 Jiri Denemark <jdenemar@redhat.com> - 9.3.0-2
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- qemu_domin: Account for NVMe disks when calculating memlock limit on hotplug (rhbz#2014030)
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* Fri May 5 2023 Jiri Denemark <jdenemar@redhat.com> - 9.3.0-1
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- Rebased to libvirt-9.3.0 (rhbz#2175785)
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- The rebase also fixes the following bugs:
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