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authorPaul Mackerras <paulus@samba.org>2011-12-12 12:38:05 +0000
committerAvi Kivity <avi@redhat.com>2012-03-05 14:52:38 +0200
commit342d3db763f2621ed4546ebf8f6c61cb29d7fbdb (patch)
treebc806911dd085905a5a97419fbc4f9fc1eeb142d /virt
parent697d3899dcb4bcd918d060a92db57b794e56b077 (diff)
downloadlinux-342d3db763f2621ed4546ebf8f6c61cb29d7fbdb.tar.gz
KVM: PPC: Implement MMU notifiers for Book3S HV guests
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. Since we can't intercept the guest DSI and ISI interrupts on PPC970, we still have to pin all the guest pages on PPC970. We have a new flag, kvm->arch.using_mmu_notifiers, that indicates whether we can page guest pages out. If it is not set, the MMU notifier callbacks do nothing and everything operates as before. Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
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