KVM: ppc: create struct kvm_vcpu_44x and introduce container_of() accessor

This patch doesn't yet move all 44x-specific data into the new structure, but
is the first step down that path. In the future we may also want to create a
struct kvm_vcpu_booke.

Based on patch from Liu Yu <yu.liu@freescale.com>.

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

arch/powerpc/include/asm/kvm_44x.h

@@ -0,0 +1,47 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * Copyright IBM Corp. 2008
+ *
+ * Authors: Hollis Blanchard <hollisb@us.ibm.com>
+ */
+
+#ifndef __ASM_44X_H__
+#define __ASM_44X_H__
+
+#include <linux/kvm_host.h>
+
+/* XXX Can't include mmu-44x.h because it redefines struct mm_context. */
+#define PPC44x_TLB_SIZE 64
+
+struct kvmppc_vcpu_44x {
+	/* Unmodified copy of the guest's TLB. */
+	struct kvmppc_44x_tlbe guest_tlb[PPC44x_TLB_SIZE];
+	/* TLB that's actually used when the guest is running. */
+	struct kvmppc_44x_tlbe shadow_tlb[PPC44x_TLB_SIZE];
+	/* Pages which are referenced in the shadow TLB. */
+	struct page *shadow_pages[PPC44x_TLB_SIZE];
+
+	/* Track which TLB entries we've modified in the current exit. */
+	u8 shadow_tlb_mod[PPC44x_TLB_SIZE];
+
+	struct kvm_vcpu vcpu;
+};
+
+static inline struct kvmppc_vcpu_44x *to_44x(struct kvm_vcpu *vcpu)
+{
+	return container_of(vcpu, struct kvmppc_vcpu_44x, vcpu);
+}
+
+#endif /* __ASM_44X_H__ */