KVM: PPC: Book3S HV: MMU notifier callbacks for radix guests

This adapts our implementations of the MMU notifier callbacks
(unmap_hva, unmap_hva_range, age_hva, test_age_hva, set_spte_hva)
to call radix functions when the guest is using radix.  These
implementations are much simpler than for HPT guests because we
have only one PTE to deal with, so we don't need to traverse
rmap chains.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

1 files changed, 54 insertions, 0 deletions

diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c
index 865ea9bca364..69cabadc121a 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_radix.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c
@@ -463,6 +463,60 @@ int kvmppc_book3s_radix_page_fault(struct kvm_run *run, struct kvm_vcpu *vcpu,
 	return ret;
 }
 
+/* Called with kvm->lock held */
+int kvm_unmap_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
+		    unsigned long gfn)
+{
+	pte_t *ptep;
+	unsigned long gpa = gfn << PAGE_SHIFT;
+	unsigned int shift;
+
+	ptep = __find_linux_pte_or_hugepte(kvm->arch.pgtable, gpa,
+					   NULL, &shift);
+	if (ptep && pte_present(*ptep)) {
+		kvmppc_radix_update_pte(kvm, ptep, _PAGE_PRESENT, 0,
+					gpa, shift);
+		kvmppc_radix_tlbie_page(kvm, gpa, shift);
+	}
+	return 0;				
+}
+
+/* Called with kvm->lock held */
+int kvm_age_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
+		  unsigned long gfn)
+{
+	pte_t *ptep;
+	unsigned long gpa = gfn << PAGE_SHIFT;
+	unsigned int shift;
+	int ref = 0;
+
+	ptep = __find_linux_pte_or_hugepte(kvm->arch.pgtable, gpa,
+					   NULL, &shift);
+	if (ptep && pte_present(*ptep) && pte_young(*ptep)) {
+		kvmppc_radix_update_pte(kvm, ptep, _PAGE_ACCESSED, 0,
+					gpa, shift);
+		/* XXX need to flush tlb here? */
+		ref = 1;
+	}
+	return ref;
+}
+
+/* Called with kvm->lock held */
+int kvm_test_age_radix(struct kvm *kvm, struct kvm_memory_slot *memslot,
+		       unsigned long gfn)
+{
+	pte_t *ptep;
+	unsigned long gpa = gfn << PAGE_SHIFT;
+	unsigned int shift;
+	int ref = 0;
+
+	ptep = __find_linux_pte_or_hugepte(kvm->arch.pgtable, gpa,
+					   NULL, &shift);
+	if (ptep && pte_present(*ptep) && pte_young(*ptep))
+		ref = 1;
+	return ref;
+}
+
 void kvmppc_free_radix(struct kvm *kvm)
 {
 	unsigned long ig, iu, im;