KVM: PPC: Book3s HV: Implement get_dirty_log using hardware changed bit

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This changes the implementation of kvm_vm_ioctl_get_dirty_log() for
Book3s HV guests to use the hardware C (changed) bits in the guest
hashed page table.  Since this makes the implementation quite different
from the Book3s PR case, this moves the existing implementation from
book3s.c to book3s_pr.c and creates a new implementation in book3s_hv.c.
That implementation calls kvmppc_hv_get_dirty_log() to do the actual
work by calling kvm_test_clear_dirty on each page.  It iterates over
the HPTEs, clearing the C bit if set, and returns 1 if any C bit was
set (including the saved C bit in the rmap entry).

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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This commit is contained in:

Paul Mackerras 2011-12-15 02:03:22 +00:00 • committed by Avi Kivity

parent 5551489373

commit 82ed36164c

5 changed files with 147 additions and 39 deletions

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2

arch/powerpc/include/asm/kvm_book3s.h

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39

arch/powerpc/kvm/book3s.c

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69

arch/powerpc/kvm/book3s_64_mmu_hv.c

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37

arch/powerpc/kvm/book3s_hv.c

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39

arch/powerpc/kvm/book3s_pr.c

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