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Userfaultfd is by default allowed only for privileged processes. Since libvirt runs QEMU unprivileged, we need to enable unprivileged access to userfaultfd to enable post-copy migration. https://bugzilla.redhat.com/show_bug.cgi?id=1945420 Signed-off-by: Jiri Denemark <jdenemar@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
7 lines
311 B
Plaintext
7 lines
311 B
Plaintext
# This is needed to support post-copy migration for QEMU run by libvirt,
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# i.e., unprivileged, as userfaultfd is by default only available to
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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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