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From 08fef741d85ecfb3493c47f5f1334f91c30e3233 Mon Sep 17 00:00:00 2001
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Message-Id: <08fef741d85ecfb3493c47f5f1334f91c30e3233@dist-git>
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From: Jiri Denemark <jdenemar@redhat.com>
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Date: Wed, 9 Feb 2022 11:08:42 +0100
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Subject: [PATCH] qemu: Ignore missing vm.unprivileged_userfaultfd sysctl
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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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Older kernels did not support this sysctl, but they did not restrict
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userfaultfd in any way so everything worked as if
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vm.unprivileged_userfaultfd was set to 1. Thus we can safely ignore
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errors when setting the value.
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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
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Reviewed-by: Ján Tomko <jtomko@redhat.com>
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(cherry picked from commit 558f00397a0d46ad22bf53a22a40ed6fc4fdb5eb)
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https://bugzilla.redhat.com/show_bug.cgi?id=2148578
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Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
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---
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src/qemu/postcopy-migration.sysctl | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/qemu/postcopy-migration.sysctl b/src/qemu/postcopy-migration.sysctl
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index aa8f015ae0..db3f11e49f 100644
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--- a/src/qemu/postcopy-migration.sysctl
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+++ b/src/qemu/postcopy-migration.sysctl
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@@ -3,4 +3,4 @@
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# privileged processes.
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# It can be safely overridden by a file in /etc/sysctl.d/ in case post-copy
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# migration is not used on the host.
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-vm.unprivileged_userfaultfd = 1
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+-vm.unprivileged_userfaultfd = 1
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--
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2.39.0
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