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authorAnnie Li <annie.li@oracle.com>2011-11-22 05:59:21 +0400
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-11-22 18:24:51 +0400
commit85ff6acb075a484780b3d763fdf41596d8fc0970 (patch)
tree30c3f1622c525036e1cefc8ade5853c0be700cb4 /include/linux/printk.h
parentb1e495b2fae578b1bd3ab1906cb15aac43f96fee (diff)
downloadlinux-85ff6acb075a484780b3d763fdf41596d8fc0970.tar.xz
xen/granttable: Grant tables V2 implementation
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: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Annie Li <annie.li@oracle.com> [v1: Modified alloc_vm_area call (new parameters), indentation, and cleanpatch warnings] Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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