KVM: PPC: Release clean pages as clean

When we mapped a page as read-only, we can just release it as clean to
KVM's page claim mechanisms, because we're pretty sure it hasn't been
touched.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/arch/powerpc/kvm/book3s_64_mmu_host.c b/arch/powerpc/kvm/book3s_64_mmu_host.c
index 0eea589dbef0..b23015438371 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_host.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_host.c
@@ -55,7 +55,11 @@ static void invalidate_pte(struct hpte_cache *pte)
                                MMU_PAGE_4K, MMU_SEGSIZE_256M,
                                false);
         pte->host_va = 0;
-        kvm_release_pfn_dirty(pte->pfn);
+
+        if (pte->pte.may_write)
+                kvm_release_pfn_dirty(pte->pfn);
+        else
+                kvm_release_pfn_clean(pte->pfn);
 }
 
 void kvmppc_mmu_pte_flush(struct kvm_vcpu *vcpu, u64 guest_ea, u64 ea_mask)