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Add KVM_CAP_S390_HPAGE_2G to signal to userspace that 2G hugepages may be used to back the guest; restrictions apply similar to 1M hugepages. Enable the (for now still ignored) GMAP_FLAG_ALLOW_HPAGE_2G flag for the guest gmap, and propagate / disable it as necessary. Reviewed-by: Steffen Eiden <seiden@linux.ibm.com> Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Message-ID: <20260609150930.665370-3-imbrenda@linux.ibm.com>