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From 9cf56b5a0d1394fef10afdd763dc8005457bbaf5 Mon Sep 17 00:00:00 2001
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Message-Id: <9cf56b5a0d1394fef10afdd763dc8005457bbaf5@dist-git>
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From: Pavel Hrdina <phrdina@redhat.com>
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Date: Fri, 19 Feb 2021 13:33:51 +0100
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Subject: [PATCH] vircgroupv2: properly detect placement of running VM
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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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When libvirtd starts a VM it internally stores a path to the main
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cgroup. When we restart libvirtd we should get to the same state.
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When we start a VM on host with systemd the cgroup is created for us and
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the process is already placed into that cgroup and we detect the path
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created by systemd using /proc/$PID/cgroup. After that we create
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sub-cgroups and move all threads there.
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Once libvirtd is restarted we again detect the cgroup path using
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/proc/$PID/cgroup, but in this case we will get a different path because
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the main thread was moved to a "emulator" cgroup.
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Instead of ignoring the "emulator" directory when validating cgroups
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remove it completely when detecting cgroup otherwise cgroups will not
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work properly when libvirtd is restarted.
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Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
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Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
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(cherry picked from commit 902c6644a8ec292789d561b3188e576c37a86872)
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Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1798463
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Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
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Message-Id: <10fb6b61cbb4f9caf8e8ba7706ec01d1da41fc67.1613737828.git.phrdina@redhat.com>
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Reviewed-by: Ján Tomko <jtomko@redhat.com>
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---
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src/util/vircgroupv2.c | 17 ++++++++++-------
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1 file changed, 10 insertions(+), 7 deletions(-)
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diff --git a/src/util/vircgroupv2.c b/src/util/vircgroupv2.c
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index 92ae3ec839..4682a6a920 100644
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--- a/src/util/vircgroupv2.c
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+++ b/src/util/vircgroupv2.c
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@@ -121,12 +121,6 @@ virCgroupV2ValidateMachineGroup(virCgroupPtr group,
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if (!(tmp = strrchr(group->unified.placement, '/')))
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return false;
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- if (STREQ(tmp, "/emulator")) {
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- *tmp = '\0';
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-
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- if (!(tmp = strrchr(group->unified.placement, '/')))
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- return false;
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- }
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tmp++;
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if (STRNEQ(tmp, partmachinename) &&
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@@ -197,6 +191,9 @@ virCgroupV2DetectPlacement(virCgroupPtr group,
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const char *controllers,
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const char *selfpath)
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{
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+ g_autofree char *placement = g_strdup(selfpath);
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+ char *tmp = NULL;
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+
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if (group->unified.placement)
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return 0;
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@@ -207,12 +204,18 @@ virCgroupV2DetectPlacement(virCgroupPtr group,
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if (STRNEQ(controllers, ""))
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return 0;
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+ /* Running VM will have the main thread placed in emulator cgroup
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+ * but we need to get the main cgroup. */
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+ tmp = g_strrstr(placement, "/emulator");
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+ if (tmp)
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+ *tmp = '\0';
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+
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/*
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* selfpath == "/" + path="" -> "/"
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* selfpath == "/libvirt.service" + path == "" -> "/libvirt.service"
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* selfpath == "/libvirt.service" + path == "foo" -> "/libvirt.service/foo"
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*/
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- group->unified.placement = g_strdup_printf("%s%s%s", selfpath,
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+ group->unified.placement = g_strdup_printf("%s%s%s", placement,
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(STREQ(selfpath, "/") || STREQ(path, "") ? "" : "/"), path);
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return 0;
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--
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2.30.0
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