On 01/04/2012 03:10 AM, Alexander Graf wrote: > From: Paul Mackerras <pau...@samba.org> > > This adds the infrastructure to enable us to page out pages underneath > a Book3S HV guest, on processors that support virtualized partition > memory, that is, POWER7. Instead of pinning all the guest's pages, > we now look in the host userspace Linux page tables to find the > mapping for a given guest page. Then, if the userspace Linux PTE > gets invalidated, kvm_unmap_hva() gets called for that address, and > we replace all the guest HPTEs that refer to that page with absent > HPTEs, i.e. ones with the valid bit clear and the HPTE_V_ABSENT bit > set, which will cause an HDSI when the guest tries to access them. > Finally, the page fault handler is extended to reinstantiate the > guest HPTE when the guest tries to access a page which has been paged > out.
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