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

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>

1 files changed, 0 insertions, 39 deletions

diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 6bf7e0582c5a..7d54f4ed6d96 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -477,45 +477,6 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
         return 0;
 }
 
-/*
- * Get (and clear) the dirty memory log for a memory slot.
- */
-int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
-                                      struct kvm_dirty_log *log)
-{
-        struct kvm_memory_slot *memslot;
-        struct kvm_vcpu *vcpu;
-        ulong ga, ga_end;
-        int is_dirty = 0;
-        int r;
-        unsigned long n;
-
-        mutex_lock(&kvm->slots_lock);
-
-        r = kvm_get_dirty_log(kvm, log, &is_dirty);
-        if (r)
-                goto out;
-
-        /* If nothing is dirty, don't bother messing with page tables. */
-        if (is_dirty) {
-                memslot = id_to_memslot(kvm->memslots, log->slot);
-
-                ga = memslot->base_gfn << PAGE_SHIFT;
-                ga_end = ga + (memslot->npages << PAGE_SHIFT);
-
-                kvm_for_each_vcpu(n, vcpu, kvm)
-                        kvmppc_mmu_pte_pflush(vcpu, ga, ga_end);
-
-                n = kvm_dirty_bitmap_bytes(memslot);
-                memset(memslot->dirty_bitmap, 0, n);
-        }
-
-        r = 0;
-out:
-        mutex_unlock(&kvm->slots_lock);
-        return r;
-}
-
 void kvmppc_decrementer_func(unsigned long data)
 {
         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;