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Older kernels did not support this sysctl, but they did not restrict userfaultfd in any way so everything worked as if vm.unprivileged_userfaultfd was set to 1. Thus we can safely ignore errors when setting the value. Signed-off-by: Jiri Denemark <jdenemar@redhat.com> Reviewed-by: Ján Tomko <jtomko@redhat.com>
7 lines
312 B
Plaintext
7 lines
312 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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