KVM: PPC: Book3S_64 PR: Access HTAB in big endian

The HTAB is always big endian. We access the guest's HTAB using
copy_from/to_user, but don't yet take care of the fact that we might
be running on an LE host.

Wrap all accesses to the guest HTAB with big endian accessors.

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

diff --git a/arch/powerpc/kvm/book3s_64_mmu.c b/arch/powerpc/kvm/book3s_64_mmu.c
index 171e5ca..b93c245 100644 (file)
--- a/arch/powerpc/kvm/book3s_64_mmu.c
+++ b/arch/powerpc/kvm/book3s_64_mmu.c
@@ -275,12 +275,15 @@ do_second:
                key = 4;
 
        for (i=0; i<16; i+=2) {
+               u64 pte0 = be64_to_cpu(pteg[i]);
+               u64 pte1 = be64_to_cpu(pteg[i + 1]);
+
                /* Check all relevant fields of 1st dword */
-               if ((pteg[i] & v_mask) == v_val) {
+               if ((pte0 & v_mask) == v_val) {
                        /* If large page bit is set, check pgsize encoding */
                        if (slbe->large &&
                            (vcpu->arch.hflags & BOOK3S_HFLAG_MULTI_PGSIZE)) {
-                               pgsize = decode_pagesize(slbe, pteg[i+1]);
+                               pgsize = decode_pagesize(slbe, pte1);
                                if (pgsize < 0)
                                        continue;
                        }
@@ -297,8 +300,8 @@ do_second:
                goto do_second;
        }
 
-       v = pteg[i];
-       r = pteg[i+1];
+       v = be64_to_cpu(pteg[i]);
+       r = be64_to_cpu(pteg[i+1]);
        pp = (r & HPTE_R_PP) | key;
        if (r & HPTE_R_PP0)
                pp |= 8;