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Since it was never possible to use a non-PAGE_SIZE-aligned @source_addr, go ahead and document this as a requirement. This is in preparation for enforcing page-aligned @source_addr for all architectures in guest_memfd. Reviewed-by: Vishal Annapurve <vannapurve@google.com> Tested-by: Kai Huang <kai.huang@intel.com> Signed-off-by: Michael Roth <michael.roth@amd.com> Reviewed-by: Yan Zhao <yan.y.zhao@intel.com> Link: https://patch.msgid.link/20260108214622.1084057-6-michael.roth@amd.com Signed-off-by: Sean Christopherson <seanjc@google.com>