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In the past, KVM_SEV_SNP_LAUNCH_UPDATE accepted a non-page-aligned 'uaddr' parameter to copy data from, but continuing to support this with new functionality like in-place conversion and hugepages in the pipeline has proven to be more trouble than it is worth, since there are no known users that have been identified who use a non-page-aligned 'uaddr' parameter. Rather than locking guest_memfd into continuing to support this, go ahead and document page-alignment as a requirement and begin enforcing this in the handling function. Reviewed-by: Vishal Annapurve <vannapurve@google.com> Tested-by: Kai Huang <kai.huang@intel.com> Signed-off-by: Michael Roth <michael.roth@amd.com> Link: https://patch.msgid.link/20260108214622.1084057-5-michael.roth@amd.com Signed-off-by: Sean Christopherson <seanjc@google.com>