• Annie Li's avatar
    xen/granttable: Grant tables V2 implementation · 85ff6acb
    Annie Li authored
    Receiver-side copying of packets is based on this implementation, it gives
    better performance and better CPU accounting. It totally supports three types:
    full-page, sub-page and transitive grants.
    
    However this patch does not cover sub-page and transitive grants, it mainly
    focus on Full-page part and implements grant table V2 interfaces corresponding
    to what already exists in grant table V1, such as: grant table V2
    initialization, mapping, releasing and exported interfaces.
    
    Each guest can only supports one type of grant table type, every entry in grant
    table should be the same version. It is necessary to set V1 or V2 version before
    initializing the grant table.
    
    Grant table exported interfaces of V2 are same with those of V1, Xen is
    responsible to judge what grant table version guests are using in every grant
    operation.
    
    V2 fulfills the same role of V1, and it is totally backwards compitable with V1.
    If dom0 support grant table V2, the guests runing on it can run with either V1
    or V2.
    Acked-by: default avatarIan Campbell <ian.campbell@citrix.com>
    Signed-off-by: default avatarAnnie Li <annie.li@oracle.com>
    [v1: Modified alloc_vm_area call (new parameters), indentation, and cleanpatch
         warnings]
    Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    85ff6acb
grant-table.c 25.1 KB