[Xen-devel] [PATCH V2 0/2] xen: patches for supporting sub-page and transitive grants

[annie.li@xxxxxxxxxx]

Hi

Following two patches introduce and implement interfaces for sub-page and 
transitive grants, and they are based on linux-next branch of 
linux/kernel/git/konrad/xen.git(3.2.0-rc2+). Sub-page and transitive grants are 
new types of grant table V2.

Descriptions for those patches:

Through sub-page grant table interfaces, a domain can grant another domain 
access to a range of bytes within a page, and Xen will then prevent the grantee 
domain accessing outside that range.  For obvious reasons, it isn't possible to 
map these grant references, and domains are expected to use the grant copy 
hypercall instead.

Through transitive grant interfaces,  a domain can create grant reference which 
redirects to another grant reference, so that any attempt to access the first 
grant reference will be redirected to the second one.  This is used to 
implement receiver-side copy on inter-domain traffic: rather than copying the 
packet in dom0, dom0 creates a transitive grant referencing the original 
transmit buffer, and passes that to the receiving domain.

Annie Li (2):
  xen/granttable: Support sub-page grants
  xen/granttable: Support transitive grants

 drivers/xen/grant-table.c |  147 +++++++++++++++++++++++++++++++++++++++++++++
 include/xen/grant_table.h |   25 ++++++++
 2 files changed, 172 insertions(+), 0 deletions(-)

Thanks
Annie

-- 
1.7.6.4


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