KVM: PPC: Book3S PR: PAPR: Access HTAB in big endian

The HTAB on PPC is always in big endian. When we access it via hypercalls
on behalf of the guest and we're running on a little endian host, we need
to make sure we swap the bits accordingly.

Signed-off-by: Alexander Graf <agraf@suse.de>

diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c
index 5efa97b..255e5b1 100644 (file)
--- a/arch/powerpc/kvm/book3s_pr_papr.c
+++ b/arch/powerpc/kvm/book3s_pr_papr.c
@@ -57,7 +57,7 @@ static int kvmppc_h_pr_enter(struct kvm_vcpu *vcpu)
                for (i = 0; ; ++i) {
                        if (i == 8)
                                goto done;
-                       if ((*hpte & HPTE_V_VALID) == 0)
+                       if ((be64_to_cpu(*hpte) & HPTE_V_VALID) == 0)
                                break;
                        hpte += 2;
                }
@@ -67,8 +67,8 @@ static int kvmppc_h_pr_enter(struct kvm_vcpu *vcpu)
                        goto done;
        }
 
-       hpte[0] = kvmppc_get_gpr(vcpu, 6);
-       hpte[1] = kvmppc_get_gpr(vcpu, 7);
+       hpte[0] = cpu_to_be64(kvmppc_get_gpr(vcpu, 6));
+       hpte[1] = cpu_to_be64(kvmppc_get_gpr(vcpu, 7));
        pteg_addr += i * HPTE_SIZE;
        copy_to_user((void __user *)pteg_addr, hpte, HPTE_SIZE);
        kvmppc_set_gpr(vcpu, 4, pte_index | i);
@@ -93,6 +93,8 @@ static int kvmppc_h_pr_remove(struct kvm_vcpu *vcpu)
        pteg = get_pteg_addr(vcpu, pte_index);
        mutex_lock(&vcpu->kvm->arch.hpt_mutex);
        copy_from_user(pte, (void __user *)pteg, sizeof(pte));
+       pte[0] = be64_to_cpu(pte[0]);
+       pte[1] = be64_to_cpu(pte[1]);
 
        ret = H_NOT_FOUND;
        if ((pte[0] & HPTE_V_VALID) == 0 ||
@@ -169,6 +171,8 @@ static int kvmppc_h_pr_bulk_remove(struct kvm_vcpu *vcpu)
 
                pteg = get_pteg_addr(vcpu, tsh & H_BULK_REMOVE_PTEX);
                copy_from_user(pte, (void __user *)pteg, sizeof(pte));
+               pte[0] = be64_to_cpu(pte[0]);
+               pte[1] = be64_to_cpu(pte[1]);
 
                /* tsl = AVPN */
                flags = (tsh & H_BULK_REMOVE_FLAGS) >> 26;
@@ -207,6 +211,8 @@ static int kvmppc_h_pr_protect(struct kvm_vcpu *vcpu)
        pteg = get_pteg_addr(vcpu, pte_index);
        mutex_lock(&vcpu->kvm->arch.hpt_mutex);
        copy_from_user(pte, (void __user *)pteg, sizeof(pte));
+       pte[0] = be64_to_cpu(pte[0]);
+       pte[1] = be64_to_cpu(pte[1]);
 
        ret = H_NOT_FOUND;
        if ((pte[0] & HPTE_V_VALID) == 0 ||
@@ -225,6 +231,8 @@ static int kvmppc_h_pr_protect(struct kvm_vcpu *vcpu)
 
        rb = compute_tlbie_rb(v, r, pte_index);
        vcpu->arch.mmu.tlbie(vcpu, rb, rb & 1 ? true : false);
+       pte[0] = cpu_to_be64(pte[0]);
+       pte[1] = cpu_to_be64(pte[1]);
        copy_to_user((void __user *)pteg, pte, sizeof(pte));
        ret = H_SUCCESS;