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authorDaniel De Graaf <dgdegra@tycho.nsa.gov>2011-02-03 12:19:02 -0500
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2011-02-14 14:15:55 -0500
commitaab8f11a6b4641fcb8c139420f2eae879b5d1698 (patch)
tree11142851a24c5c26e83199980926558788335c49 /Documentation/cpu-freq
parent68b025c813c2eb41ff25628e3d4952d5185eb1a4 (diff)
xen-gntdev: Support mapping in HVM domains
HVM does not allow direct PTE modification, so instead we request that Xen change its internal p2m mappings on the allocated pages and map the memory into userspace normally. Note: The HVM path for map and unmap is slightly different: HVM keeps the pages mapped until the area is deleted, while the PV case (use_ptemod being true) must unmap them when userspace unmaps the range. In the normal use case, this makes no difference to users since unmap time is deletion time. [v2: Expanded commit descr.] Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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