KVM: PPC: Make PAM a define

On PowerPC it's very normal to not support all of the physical RAM in real mode.
To check if we're matching on the shared page or not, we need to know the limits
so we can restrain ourselves to that range.

So let's make it a define instead of open-coding it. And while at it, let's also
increase it.
Signed-off-by: Alexander Graf <agraf@suse.de>

v2 -> v3:

  - RMO -> PAM (non-magic page)
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/powerpc/include/asm/kvm_host.h

@@ -48,6 +48,9 @@
 #define HPTEG_HASH_NUM_VPTE		(1 << HPTEG_HASH_BITS_VPTE)
 #define HPTEG_HASH_NUM_VPTE_LONG	(1 << HPTEG_HASH_BITS_VPTE_LONG)
 
+/* Physical Address Mask - allowed range of real mode RAM access */
+#define KVM_PAM			0x0fffffffffffffffULL
+
 struct kvm;
 struct kvm_run;
 struct kvm_vcpu;

arch/powerpc/kvm/book3s.c

@@ -465,7 +465,7 @@ static int kvmppc_xlate(struct kvm_vcpu *vcpu, ulong eaddr, bool data,
 		r = vcpu->arch.mmu.xlate(vcpu, eaddr, pte, data);
 	} else {
 		pte->eaddr = eaddr;
-		pte->raddr = eaddr & 0xffffffff;
+		pte->raddr = eaddr & KVM_PAM;
 		pte->vpage = VSID_REAL | eaddr >> 12;
 		pte->may_read = true;
 		pte->may_write = true;
@@ -579,7 +579,7 @@ int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
 		pte.may_execute = true;
 		pte.may_read = true;
 		pte.may_write = true;
-		pte.raddr = eaddr & 0xffffffff;
+		pte.raddr = eaddr & KVM_PAM;
 		pte.eaddr = eaddr;
 		pte.vpage = eaddr >> 12;
 	}