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From 7be804cd87131dbb2a0861e07980826a15dce376 Mon Sep 17 00:00:00 2001
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Message-Id: <7be804cd87131dbb2a0861e07980826a15dce376@dist-git>
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From: Andrea Bolognani <abologna@redhat.com>
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Date: Tue, 4 Jun 2019 16:22:06 +0200
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Subject: [PATCH] qemu: Fix qemuProcessInitCpuAffinity()
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Ever since the feature was introduced with commit 0f8e7ae33ace,
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it has contained a logic error in that it attempted to use a NUMA
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node map where a CPU map was expected.
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Because of that, guests using <numatune> might fail to start:
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# virsh start guest
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error: Failed to start domain guest
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error: cannot set CPU affinity on process 40055: Invalid argument
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This was particularly easy to trigger on POWER 8 machines, where
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secondary threads always show up as offline in the host: having
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<numatune>
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<memory mode='strict' placement='static' nodeset='1'/>
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</numatune>
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in the guest configuration, for example, would result in libvirt
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trying to set the process affinity so that it would prefer
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running on CPU 1, but since that's a secondary thread and thus
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shows up as offline, the operation would fail, and so would
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starting the guest.
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Use the newly introduced virNumaNodesetToCPUset() to convert the
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NUMA node map to a CPU map, which in the example above would be
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48,56,64,72,80,88 - a valid input for virProcessSetAffinity().
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https://bugzilla.redhat.com/show_bug.cgi?id=1703661
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Signed-off-by: Andrea Bolognani <abologna@redhat.com>
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Reviewed-by: Ján Tomko <jtomko@redhat.com>
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(cherry picked from commit 5f2212c062c720716b7701fa0a5511311dc6e906)
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Signed-off-by: Andrea Bolognani <abologna@redhat.com>
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Message-Id: <20190604142207.2036-6-abologna@redhat.com>
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Reviewed-by: Ján Tomko <jtomko@redhat.com>
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---
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src/qemu/qemu_process.c | 7 ++++++-
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1 file changed, 6 insertions(+), 1 deletion(-)
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diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
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index 7f70d79566..4c28f250f6 100644
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--- a/src/qemu/qemu_process.c
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+++ b/src/qemu/qemu_process.c
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@@ -2382,11 +2382,16 @@ qemuProcessInitCpuAffinity(virDomainObjPtr vm)
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if (virDomainNumaGetNodeCount(vm->def->numa) <= 1 &&
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virDomainNumatuneGetMode(vm->def->numa, -1, &mem_mode) == 0 &&
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mem_mode == VIR_DOMAIN_NUMATUNE_MEM_STRICT) {
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+ virBitmapPtr nodeset = NULL;
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+
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if (virDomainNumatuneMaybeGetNodeset(vm->def->numa,
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priv->autoNodeset,
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- &cpumapToSet,
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+ &nodeset,
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-1) < 0)
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goto cleanup;
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+
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+ if (virNumaNodesetToCPUset(nodeset, &cpumapToSet) < 0)
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+ goto cleanup;
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} else if (vm->def->cputune.emulatorpin) {
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cpumapToSet = vm->def->cputune.emulatorpin;
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} else {
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--
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2.21.0
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