hostmem-memfd: add checks before adding hostmem-memfd & properties
Run some memfd-related checks before registering hostmem-memfd & various properties. This will help libvirt to figure out what the host is supposed to be capable of. qemu_memfd_check() is changed to a less optimized version, since it is used with various flags, it no longer caches the result. Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <20180906161415.8543-1-marcandre.lureau@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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