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It is currently not possible yet to use "memory-backend-memfd" on s390x with hugepages enabled. This problem is caused by qemu_maxrampagesize() not taking memory-backend-memfd objects into account yet, so the code in s390_memory_init() fails to enable the huge page support there via s390_set_max_pagesize(). Fix it by generalizing the code, so that it looks at qemu_ram_pagesize(memdev->mr.ram_block) instead of re-trying to get the information from the filesystem. Suggested-by: David Hildenbrand <david@redhat.com> Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=2116496 Message-Id: <20220810125720.3849835-2-thuth@redhat.com> Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Signed-off-by: Thomas Huth <thuth@redhat.com>