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This patch adds the following hcall wrapper functions to allocate, modify and deallocate VAS windows, and retrieve VAS capabilities. H_ALLOCATE_VAS_WINDOW: Allocate VAS window H_DEALLOCATE_VAS_WINDOW: Close VAS window H_MODIFY_VAS_WINDOW: Setup window before using H_QUERY_VAS_CAPABILITIES: Get VAS capabilities Signed-off-by: Haren Myneni <haren@linux.ibm.com> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/40fb02a4d56ca4e240b074a15029082055be5997.camel@linux.ibm.com