On Tue, Aug 09, 2011 at 10:20:27AM +0100, Avi Kivity wrote: > On 08/06/2011 01:39 PM, Christoffer Dall wrote: > > Adds support in the identity mapping feature that allows KVM to setup > > identity mapping for the Hyp mode with the AP[1] bit set as required by > > the specification and also supports freeing created sub pmd's after > > finished use. > > > > These two functions: > > - hyp_identity_mapping_add(pgd, addr, end); > > - hyp_identity_mapping_del(pgd, addr, end); > > are essentially calls the same function as the non-hyp versions but > > with a different argument value. KVM calls these functions to setup > > and teardown the identity mapping used to initialize the hypervisor. > > > > Note, the hyp-version of the _del function actually frees the pmd's > > pointed to by the pgd as opposed to the non-hyp version which just > > clears them. > > > > > > These are for mapping host memory, not guest memory, right? Yes. There is some code that is built into the kernel image (and address space) but it needs to run in Hypervisor mode which has its own MMU translation tables. -- Catalin
