KVM: PPC: Make shared struct aka magic page guest endian

The shared (magic) page is a data structure that contains often used
supervisor privileged SPRs accessible via memory to the user to reduce
the number of exits we have to take to read/write them.

When we actually share this structure with the guest we have to maintain
it in guest endianness, because some of the patch tricks only work with
native endian load/store operations.

Since we only share the structure with either host or guest in little
endian on book3s_64 pr mode, we don't have to worry about booke or book3s hv.

For booke, the shared struct stays big endian. For book3s_64 hv we maintain
the struct in host native endian, since it never gets shared with the guest.

For book3s_64 pr we introduce a variable that tells us which endianness the
shared struct is in and route every access to it through helper inline
functions that evaluate this variable.

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

20 files changed, 309 insertions, 143 deletions

diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h
index bb1e38a2..f52f656 100644
--- a/arch/powerpc/include/asm/kvm_book3s.h
+++ b/arch/powerpc/include/asm/kvm_book3s.h
@@ -268,9 +268,10 @@ static inline ulong kvmppc_get_pc(struct kvm_vcpu *vcpu)
 	return vcpu->arch.pc;
 }
 
+static inline u64 kvmppc_get_msr(struct kvm_vcpu *vcpu);
 static inline bool kvmppc_need_byteswap(struct kvm_vcpu *vcpu)
 {
-	return (vcpu->arch.shared->msr & MSR_LE) != (MSR_KERNEL & MSR_LE);
+	return (kvmppc_get_msr(vcpu) & MSR_LE) != (MSR_KERNEL & MSR_LE);
 }
 
 static inline u32 kvmppc_get_last_inst_internal(struct kvm_vcpu *vcpu, ulong pc)
diff --git a/arch/powerpc/include/asm/kvm_booke.h b/arch/powerpc/include/asm/kvm_booke.h
index 80d46b5..c7aed61 100644
--- a/arch/powerpc/include/asm/kvm_booke.h
+++ b/arch/powerpc/include/asm/kvm_booke.h
@@ -108,9 +108,4 @@ static inline ulong kvmppc_get_fault_dar(struct kvm_vcpu *vcpu)
 {
 	return vcpu->arch.fault_dear;
 }
-
-static inline ulong kvmppc_get_msr(struct kvm_vcpu *vcpu)
-{
-	return vcpu->arch.shared->msr;
-}
 #endif /* __ASM_KVM_BOOKE_H__ */
diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index d342f8e..15f19d3 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -623,6 +623,9 @@ struct kvm_vcpu_arch {
 	wait_queue_head_t cpu_run;
 
 	struct kvm_vcpu_arch_shared *shared;
+#if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_KVM_BOOK3S_PR_POSSIBLE)
+	bool shared_big_endian;
+#endif
 	unsigned long magic_page_pa; /* phys addr to map the magic page to */
 	unsigned long magic_page_ea; /* effect. addr to map the magic page to */
 
diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
index 4096f16..4a7cc45 100644
--- a/arch/powerpc/include/asm/kvm_ppc.h
+++ b/arch/powerpc/include/asm/kvm_ppc.h
@@ -449,6 +449,84 @@ static inline void kvmppc_mmu_flush_icache(pfn_t pfn)
 }
 
 /*
+ * Shared struct helpers. The shared struct can be little or big endian,
+ * depending on the guest endianness. So expose helpers to all of them.
+ */
+static inline bool kvmppc_shared_big_endian(struct kvm_vcpu *vcpu)
+{
+#if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_KVM_BOOK3S_PR_POSSIBLE)
+	/* Only Book3S_64 PR supports bi-endian for now */
+	return vcpu->arch.shared_big_endian;
+#elif defined(CONFIG_PPC_BOOK3S_64) && defined(__LITTLE_ENDIAN__)
+	/* Book3s_64 HV on little endian is always little endian */
+	return false;
+#else
+	return true;
+#endif
+}
+
+#define SHARED_WRAPPER_GET(reg, size)					\
+static inline u##size kvmppc_get_##reg(struct kvm_vcpu *vcpu)	\
+{									\
+	if (kvmppc_shared_big_endian(vcpu))				\
+	       return be##size##_to_cpu(vcpu->arch.shared->reg);	\
+	else								\
+	       return le##size##_to_cpu(vcpu->arch.shared->reg);	\
+}									\
+
+#define SHARED_WRAPPER_SET(reg, size)					\
+static inline void kvmppc_set_##reg(struct kvm_vcpu *vcpu, u##size val)	\
+{									\
+	if (kvmppc_shared_big_endian(vcpu))				\
+	       vcpu->arch.shared->reg = cpu_to_be##size(val);		\
+	else								\
+	       vcpu->arch.shared->reg = cpu_to_le##size(val);		\
+}									\
+
+#define SHARED_WRAPPER(reg, size)					\
+	SHARED_WRAPPER_GET(reg, size)					\
+	SHARED_WRAPPER_SET(reg, size)					\
+
+SHARED_WRAPPER(critical, 64)
+SHARED_WRAPPER(sprg0, 64)
+SHARED_WRAPPER(sprg1, 64)
+SHARED_WRAPPER(sprg2, 64)
+SHARED_WRAPPER(sprg3, 64)
+SHARED_WRAPPER(srr0, 64)
+SHARED_WRAPPER(srr1, 64)
+SHARED_WRAPPER(dar, 64)
+SHARED_WRAPPER_GET(msr, 64)
+static inline void kvmppc_set_msr_fast(struct kvm_vcpu *vcpu, u64 val)
+{
+	if (kvmppc_shared_big_endian(vcpu))
+	       vcpu->arch.shared->msr = cpu_to_be64(val);
+	else
+	       vcpu->arch.shared->msr = cpu_to_le64(val);
+}
+SHARED_WRAPPER(dsisr, 32)
+SHARED_WRAPPER(int_pending, 32)
+SHARED_WRAPPER(sprg4, 64)
+SHARED_WRAPPER(sprg5, 64)
+SHARED_WRAPPER(sprg6, 64)
+SHARED_WRAPPER(sprg7, 64)
+
+static inline u32 kvmppc_get_sr(struct kvm_vcpu *vcpu, int nr)
+{
+	if (kvmppc_shared_big_endian(vcpu))
+	       return be32_to_cpu(vcpu->arch.shared->sr[nr]);
+	else
+	       return le32_to_cpu(vcpu->arch.shared->sr[nr]);
+}
+
+static inline void kvmppc_set_sr(struct kvm_vcpu *vcpu, int nr, u32 val)
+{
+	if (kvmppc_shared_big_endian(vcpu))
+	       vcpu->arch.shared->sr[nr] = cpu_to_be32(val);
+	else
+	       vcpu->arch.shared->sr[nr] = cpu_to_le32(val);
+}
+
+/*
  * Please call after prepare_to_enter. This function puts the lazy ee and irq
  * disabled tracking state back to normal mode, without actually enabling
  * interrupts.
@@ -485,7 +563,7 @@ static inline ulong kvmppc_get_ea_indexed(struct kvm_vcpu *vcpu, int ra, int rb)
 	msr_64bit = MSR_SF;
 #endif
 
-	if (!(vcpu->arch.shared->msr & msr_64bit))
+	if (!(kvmppc_get_msr(vcpu) & msr_64bit))
 		ea = (uint32_t)ea;
 
 	return ea;
diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index 6a4b77d..bbf3b9a 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -54,6 +54,7 @@
 #endif
 #if defined(CONFIG_KVM) && defined(CONFIG_PPC_BOOK3S)
 #include <asm/kvm_book3s.h>
+#include <asm/kvm_ppc.h>
 #endif
 
 #ifdef CONFIG_PPC32
@@ -467,6 +468,9 @@ int main(void)
 	DEFINE(VCPU_SHARED, offsetof(struct kvm_vcpu, arch.shared));
 	DEFINE(VCPU_SHARED_MSR, offsetof(struct kvm_vcpu_arch_shared, msr));
 	DEFINE(VCPU_SHADOW_MSR, offsetof(struct kvm_vcpu, arch.shadow_msr));
+#if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_KVM_BOOK3S_PR_POSSIBLE)
+	DEFINE(VCPU_SHAREDBE, offsetof(struct kvm_vcpu, arch.shared_big_endian));
+#endif
 
 	DEFINE(VCPU_SHARED_MAS0, offsetof(struct kvm_vcpu_arch_shared, mas0));
 	DEFINE(VCPU_SHARED_MAS1, offsetof(struct kvm_vcpu_arch_shared, mas1));
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 94e597e..81abc5c 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -85,9 +85,9 @@ static inline void kvmppc_update_int_pending(struct kvm_vcpu *vcpu,
 	if (is_kvmppc_hv_enabled(vcpu->kvm))
 		return;
 	if (pending_now)
-		vcpu->arch.shared->int_pending = 1;
+		kvmppc_set_int_pending(vcpu, 1);
 	else if (old_pending)
-		vcpu->arch.shared->int_pending = 0;
+		kvmppc_set_int_pending(vcpu, 0);
 }
 
 static inline bool kvmppc_critical_section(struct kvm_vcpu *vcpu)
@@ -99,11 +99,11 @@ static inline bool kvmppc_critical_section(struct kvm_vcpu *vcpu)
 	if (is_kvmppc_hv_enabled(vcpu->kvm))
 		return false;
 
-	crit_raw = vcpu->arch.shared->critical;
+	crit_raw = kvmppc_get_critical(vcpu);
 	crit_r1 = kvmppc_get_gpr(vcpu, 1);
 
 	/* Truncate crit indicators in 32 bit mode */
-	if (!(vcpu->arch.shared->msr & MSR_SF)) {
+	if (!(kvmppc_get_msr(vcpu) & MSR_SF)) {
 		crit_raw &= 0xffffffff;
 		crit_r1 &= 0xffffffff;
 	}
@@ -111,15 +111,15 @@ static inline bool kvmppc_critical_section(struct kvm_vcpu *vcpu)
 	/* Critical section when crit == r1 */
 	crit = (crit_raw == crit_r1);
 	/* ... and we're in supervisor mode */
-	crit = crit && !(vcpu->arch.shared->msr & MSR_PR);
+	crit = crit && !(kvmppc_get_msr(vcpu) & MSR_PR);
 
 	return crit;
 }
 
 void kvmppc_inject_interrupt(struct kvm_vcpu *vcpu, int vec, u64 flags)
 {
-	vcpu->arch.shared->srr0 = kvmppc_get_pc(vcpu);
-	vcpu->arch.shared->srr1 = vcpu->arch.shared->msr | flags;
+	kvmppc_set_srr0(vcpu, kvmppc_get_pc(vcpu));
+	kvmppc_set_srr1(vcpu, kvmppc_get_msr(vcpu) | flags);
 	kvmppc_set_pc(vcpu, kvmppc_interrupt_offset(vcpu) + vec);
 	vcpu->arch.mmu.reset_msr(vcpu);
 }
@@ -225,12 +225,12 @@ int kvmppc_book3s_irqprio_deliver(struct kvm_vcpu *vcpu, unsigned int priority)
 
 	switch (priority) {
 	case BOOK3S_IRQPRIO_DECREMENTER:
-		deliver = (vcpu->arch.shared->msr & MSR_EE) && !crit;
+		deliver = (kvmppc_get_msr(vcpu) & MSR_EE) && !crit;
 		vec = BOOK3S_INTERRUPT_DECREMENTER;
 		break;
 	case BOOK3S_IRQPRIO_EXTERNAL:
 	case BOOK3S_IRQPRIO_EXTERNAL_LEVEL:
-		deliver = (vcpu->arch.shared->msr & MSR_EE) && !crit;
+		deliver = (kvmppc_get_msr(vcpu) & MSR_EE) && !crit;
 		vec = BOOK3S_INTERRUPT_EXTERNAL;
 		break;
 	case BOOK3S_IRQPRIO_SYSTEM_RESET:
@@ -343,7 +343,7 @@ pfn_t kvmppc_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn, bool writing,
 {
 	ulong mp_pa = vcpu->arch.magic_page_pa;
 
-	if (!(vcpu->arch.shared->msr & MSR_SF))
+	if (!(kvmppc_get_msr(vcpu) & MSR_SF))
 		mp_pa = (uint32_t)mp_pa;
 
 	/* Magic page override */
@@ -367,7 +367,7 @@ EXPORT_SYMBOL_GPL(kvmppc_gfn_to_pfn);
 static int kvmppc_xlate(struct kvm_vcpu *vcpu, ulong eaddr, bool data,
 			bool iswrite, struct kvmppc_pte *pte)
 {
-	int relocated = (vcpu->arch.shared->msr & (data ? MSR_DR : MSR_IR));
+	int relocated = (kvmppc_get_msr(vcpu) & (data ? MSR_DR : MSR_IR));
 	int r;
 
 	if (relocated) {
@@ -498,18 +498,18 @@ int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 	regs->ctr = kvmppc_get_ctr(vcpu);
 	regs->lr = kvmppc_get_lr(vcpu);
 	regs->xer = kvmppc_get_xer(vcpu);
-	regs->msr = vcpu->arch.shared->msr;
-	regs->srr0 = vcpu->arch.shared->srr0;
-	regs->srr1 = vcpu->arch.shared->srr1;
+	regs->msr = kvmppc_get_msr(vcpu);
+	regs->srr0 = kvmppc_get_srr0(vcpu);
+	regs->srr1 = kvmppc_get_srr1(vcpu);
 	regs->pid = vcpu->arch.pid;
-	regs->sprg0 = vcpu->arch.shared->sprg0;
-	regs->sprg1 = vcpu->arch.shared->sprg1;
-	regs->sprg2 = vcpu->arch.shared->sprg2;
-	regs->sprg3 = vcpu->arch.shared->sprg3;
-	regs->sprg4 = vcpu->arch.shared->sprg4;
-	regs->sprg5 = vcpu->arch.shared->sprg5;
-	regs->sprg6 = vcpu->arch.shared->sprg6;
-	regs->sprg7 = vcpu->arch.shared->sprg7;
+	regs->sprg0 = kvmppc_get_sprg0(vcpu);
+	regs->sprg1 = kvmppc_get_sprg1(vcpu);
+	regs->sprg2 = kvmppc_get_sprg2(vcpu);
+	regs->sprg3 = kvmppc_get_sprg3(vcpu);
+	regs->sprg4 = kvmppc_get_sprg4(vcpu);
+	regs->sprg5 = kvmppc_get_sprg5(vcpu);
+	regs->sprg6 = kvmppc_get_sprg6(vcpu);
+	regs->sprg7 = kvmppc_get_sprg7(vcpu);
 
 	for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
 		regs->gpr[i] = kvmppc_get_gpr(vcpu, i);
@@ -527,16 +527,16 @@ int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
 	kvmppc_set_lr(vcpu, regs->lr);
 	kvmppc_set_xer(vcpu, regs->xer);
 	kvmppc_set_msr(vcpu, regs->msr);
-	vcpu->arch.shared->srr0 = regs->srr0;
-	vcpu->arch.shared->srr1 = regs->srr1;
-	vcpu->arch.shared->sprg0 = regs->sprg0;
-	vcpu->arch.shared->sprg1 = regs->sprg1;
-	vcpu->arch.shared->sprg2 = regs->sprg2;
-	vcpu->arch.shared->sprg3 = regs->sprg3;
-	vcpu->arch.shared->sprg4 = regs->sprg4;
-	vcpu->arch.shared->sprg5 = regs->sprg5;
-	vcpu->arch.shared->sprg6 = regs->sprg6;
-	vcpu->arch.shared->sprg7 = regs->sprg7;
+	kvmppc_set_srr0(vcpu, regs->srr0);
+	kvmppc_set_srr1(vcpu, regs->srr1);
+	kvmppc_set_sprg0(vcpu, regs->sprg0);
+	kvmppc_set_sprg1(vcpu, regs->sprg1);
+	kvmppc_set_sprg2(vcpu, regs->sprg2);
+	kvmppc_set_sprg3(vcpu, regs->sprg3);
+	kvmppc_set_sprg4(vcpu, regs->sprg4);
+	kvmppc_set_sprg5(vcpu, regs->sprg5);
+	kvmppc_set_sprg6(vcpu, regs->sprg6);
+	kvmppc_set_sprg7(vcpu, regs->sprg7);
 
 	for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
 		kvmppc_set_gpr(vcpu, i, regs->gpr[i]);
@@ -570,10 +570,10 @@ int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
 		r = 0;
 		switch (reg->id) {
 		case KVM_REG_PPC_DAR:
-			val = get_reg_val(reg->id, vcpu->arch.shared->dar);
+			val = get_reg_val(reg->id, kvmppc_get_dar(vcpu));
 			break;
 		case KVM_REG_PPC_DSISR:
-			val = get_reg_val(reg->id, vcpu->arch.shared->dsisr);
+			val = get_reg_val(reg->id, kvmppc_get_dsisr(vcpu));
 			break;
 		case KVM_REG_PPC_FPR0 ... KVM_REG_PPC_FPR31:
 			i = reg->id - KVM_REG_PPC_FPR0;
@@ -660,10 +660,10 @@ int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
 		r = 0;
 		switch (reg->id) {
 		case KVM_REG_PPC_DAR:
-			vcpu->arch.shared->dar = set_reg_val(reg->id, val);
+			kvmppc_set_dar(vcpu, set_reg_val(reg->id, val));
 			break;
 		case KVM_REG_PPC_DSISR:
-			vcpu->arch.shared->dsisr = set_reg_val(reg->id, val);
+			kvmppc_set_dsisr(vcpu, set_reg_val(reg->id, val));
 			break;
 		case KVM_REG_PPC_FPR0 ... KVM_REG_PPC_FPR31:
 			i = reg->id - KVM_REG_PPC_FPR0;
diff --git a/arch/powerpc/kvm/book3s_32_mmu.c b/arch/powerpc/kvm/book3s_32_mmu.c
index 0e42b16..628d90e 100644
--- a/arch/powerpc/kvm/book3s_32_mmu.c
+++ b/arch/powerpc/kvm/book3s_32_mmu.c
@@ -91,7 +91,7 @@ static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
 
 static u32 find_sr(struct kvm_vcpu *vcpu, gva_t eaddr)
 {
-	return vcpu->arch.shared->sr[(eaddr >> 28) & 0xf];
+	return kvmppc_get_sr(vcpu, (eaddr >> 28) & 0xf);
 }
 
 static u64 kvmppc_mmu_book3s_32_ea_to_vp(struct kvm_vcpu *vcpu, gva_t eaddr,
@@ -160,7 +160,7 @@ static int kvmppc_mmu_book3s_32_xlate_bat(struct kvm_vcpu *vcpu, gva_t eaddr,
 		else
 			bat = &vcpu_book3s->ibat[i];
 
-		if (vcpu->arch.shared->msr & MSR_PR) {
+		if (kvmppc_get_msr(vcpu) & MSR_PR) {
 			if (!bat->vp)
 				continue;
 		} else {
@@ -242,8 +242,8 @@ static int kvmppc_mmu_book3s_32_xlate_pte(struct kvm_vcpu *vcpu, gva_t eaddr,
 			pte->raddr = (pte1 & ~(0xFFFULL)) | (eaddr & 0xFFF);
 			pp = pte1 & 3;
 
-			if ((sr_kp(sre) &&  (vcpu->arch.shared->msr & MSR_PR)) ||
-			    (sr_ks(sre) && !(vcpu->arch.shared->msr & MSR_PR)))
+			if ((sr_kp(sre) &&  (kvmppc_get_msr(vcpu) & MSR_PR)) ||
+			    (sr_ks(sre) && !(kvmppc_get_msr(vcpu) & MSR_PR)))
 				pp |= 4;
 
 			pte->may_write = false;
@@ -320,7 +320,7 @@ static int kvmppc_mmu_book3s_32_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
 	/* Magic page override */
 	if (unlikely(mp_ea) &&
 	    unlikely((eaddr & ~0xfffULL) == (mp_ea & ~0xfffULL)) &&
-	    !(vcpu->arch.shared->msr & MSR_PR)) {
+	    !(kvmppc_get_msr(vcpu) & MSR_PR)) {
 		pte->vpage = kvmppc_mmu_book3s_32_ea_to_vp(vcpu, eaddr, data);
 		pte->raddr = vcpu->arch.magic_page_pa | (pte->raddr & 0xfff);
 		pte->raddr &= KVM_PAM;
@@ -345,13 +345,13 @@ static int kvmppc_mmu_book3s_32_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
 
 static u32 kvmppc_mmu_book3s_32_mfsrin(struct kvm_vcpu *vcpu, u32 srnum)
 {
-	return vcpu->arch.shared->sr[srnum];
+	return kvmppc_get_sr(vcpu, srnum);
 }
 
 static void kvmppc_mmu_book3s_32_mtsrin(struct kvm_vcpu *vcpu, u32 srnum,
 					ulong value)
 {
-	vcpu->arch.shared->sr[srnum] = value;
+	kvmppc_set_sr(vcpu, srnum, value);
 	kvmppc_mmu_map_segment(vcpu, srnum << SID_SHIFT);
 }
 
@@ -371,8 +371,9 @@ static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
 	ulong ea = esid << SID_SHIFT;
 	u32 sr;
 	u64 gvsid = esid;
+	u64 msr = kvmppc_get_msr(vcpu);
 
-	if (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
+	if (msr & (MSR_DR|MSR_IR)) {
 		sr = find_sr(vcpu, ea);
 		if (sr_valid(sr))
 			gvsid = sr_vsid(sr);
@@ -381,7 +382,7 @@ static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
 	/* In case we only have one of MSR_IR or MSR_DR set, let's put
 	   that in the real-mode context (and hope RM doesn't access
 	   high memory) */
-	switch (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
+	switch (msr & (MSR_DR|MSR_IR)) {
 	case 0:
 		*vsid = VSID_REAL | esid;
 		break;
@@ -401,7 +402,7 @@ static int kvmppc_mmu_book3s_32_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
 		BUG();
 	}
 
-	if (vcpu->arch.shared->msr & MSR_PR)
+	if (msr & MSR_PR)
 		*vsid |= VSID_PR;
 
 	return 0;
diff --git a/arch/powerpc/kvm/book3s_32_mmu_host.c b/arch/powerpc/kvm/book3s_32_mmu_host.c
index 5fac89d..678e753 100644
--- a/arch/powerpc/kvm/book3s_32_mmu_host.c
+++ b/arch/powerpc/kvm/book3s_32_mmu_host.c
@@ -92,7 +92,7 @@ static struct kvmppc_sid_map *find_sid_vsid(struct kvm_vcpu *vcpu, u64 gvsid)
 	struct kvmppc_sid_map *map;
 	u16 sid_map_mask;
 
-	if (vcpu->arch.shared->msr & MSR_PR)
+	if (kvmppc_get_msr(vcpu) & MSR_PR)
 		gvsid |= VSID_PR;
 
 	sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
@@ -279,7 +279,7 @@ static struct kvmppc_sid_map *create_sid_map(struct kvm_vcpu *vcpu, u64 gvsid)
 	u16 sid_map_mask;
 	static int backwards_map = 0;
 
-	if (vcpu->arch.shared->msr & MSR_PR)
+	if (kvmppc_get_msr(vcpu) & MSR_PR)
 		gvsid |= VSID_PR;
 
 	/* We might get collisions that trap in preceding order, so let's
diff --git a/arch/powerpc/kvm/book3s_64_mmu.c b/arch/powerpc/kvm/book3s_64_mmu.c
index b93c245..278729f 100644
--- a/arch/powerpc/kvm/book3s_64_mmu.c
+++ b/arch/powerpc/kvm/book3s_64_mmu.c
@@ -226,7 +226,7 @@ static int kvmppc_mmu_book3s_64_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
 	/* Magic page override */
 	if (unlikely(mp_ea) &&
 	    unlikely((eaddr & ~0xfffULL) == (mp_ea & ~0xfffULL)) &&
-	    !(vcpu->arch.shared->msr & MSR_PR)) {
+	    !(kvmppc_get_msr(vcpu) & MSR_PR)) {
 		gpte->eaddr = eaddr;
 		gpte->vpage = kvmppc_mmu_book3s_64_ea_to_vp(vcpu, eaddr, data);
 		gpte->raddr = vcpu->arch.magic_page_pa | (gpte->raddr & 0xfff);
@@ -269,9 +269,9 @@ do_second:
 		goto no_page_found;
 	}
 
-	if ((vcpu->arch.shared->msr & MSR_PR) && slbe->Kp)
+	if ((kvmppc_get_msr(vcpu) & MSR_PR) && slbe->Kp)
 		key = 4;
-	else if (!(vcpu->arch.shared->msr & MSR_PR) && slbe->Ks)
+	else if (!(kvmppc_get_msr(vcpu) & MSR_PR) && slbe->Ks)
 		key = 4;
 
 	for (i=0; i<16; i+=2) {
@@ -482,7 +482,7 @@ static void kvmppc_mmu_book3s_64_slbia(struct kvm_vcpu *vcpu)
 		vcpu->arch.slb[i].origv = 0;
 	}
 
-	if (vcpu->arch.shared->msr & MSR_IR) {
+	if (kvmppc_get_msr(vcpu) & MSR_IR) {
 		kvmppc_mmu_flush_segments(vcpu);
 		kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
 	}
@@ -566,7 +566,7 @@ static int segment_contains_magic_page(struct kvm_vcpu *vcpu, ulong esid)
 {
 	ulong mp_ea = vcpu->arch.magic_page_ea;
 
-	return mp_ea && !(vcpu->arch.shared->msr & MSR_PR) &&
+	return mp_ea && !(kvmppc_get_msr(vcpu) & MSR_PR) &&
 		(mp_ea >> SID_SHIFT) == esid;
 }
 #endif
@@ -579,8 +579,9 @@ static int kvmppc_mmu_book3s_64_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
 	u64 gvsid = esid;
 	ulong mp_ea = vcpu->arch.magic_page_ea;
 	int pagesize = MMU_PAGE_64K;
+	u64 msr = kvmppc_get_msr(vcpu);
 
-	if (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
+	if (msr & (MSR_DR|MSR_IR)) {
 		slb = kvmppc_mmu_book3s_64_find_slbe(vcpu, ea);
 		if (slb) {
 			gvsid = slb->vsid;
@@ -593,7 +594,7 @@ static int kvmppc_mmu_book3s_64_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
 		}
 	}
 
-	switch (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
+	switch (msr & (MSR_DR|MSR_IR)) {
 	case 0:
 		gvsid = VSID_REAL | esid;
 		break;
@@ -626,7 +627,7 @@ static int kvmppc_mmu_book3s_64_esid_to_vsid(struct kvm_vcpu *vcpu, ulong esid,
 		gvsid |= VSID_64K;
 #endif
 
-	if (vcpu->arch.shared->msr & MSR_PR)
+	if (kvmppc_get_msr(vcpu) & MSR_PR)
 		gvsid |= VSID_PR;
 
 	*vsid = gvsid;
@@ -636,7 +637,7 @@ no_slb:
 	/* Catch magic page case */
 	if (unlikely(mp_ea) &&
 	    unlikely(esid == (mp_ea >> SID_SHIFT)) &&
-	    !(vcpu->arch.shared->msr & MSR_PR)) {
+	    !(kvmppc_get_msr(vcpu) & MSR_PR)) {
 		*vsid = VSID_REAL | esid;
 		return 0;
 	}
diff --git a/arch/powerpc/kvm/book3s_64_mmu_host.c b/arch/powerpc/kvm/book3s_64_mmu_host.c
index 0d513af..e2efb85 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_host.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_host.c
@@ -58,7 +58,7 @@ static struct kvmppc_sid_map *find_sid_vsid(struct kvm_vcpu *vcpu, u64 gvsid)
 	struct kvmppc_sid_map *map;
 	u16 sid_map_mask;
 
-	if (vcpu->arch.shared->msr & MSR_PR)
+	if (kvmppc_get_msr(vcpu) & MSR_PR)
 		gvsid |= VSID_PR;
 
 	sid_map_mask = kvmppc_sid_hash(vcpu, gvsid);
@@ -230,7 +230,7 @@ static struct kvmppc_sid_map *create_sid_map(struct kvm_vcpu *vcpu, u64 gvsid)
 	u16 sid_map_mask;
 	static int backwards_map = 0;
 
-	if (vcpu->arch.shared->msr & MSR_PR)
+	if (kvmppc_get_msr(vcpu) & MSR_PR)
 		gvsid |= VSID_PR;
 
 	/* We might get collisions that trap in preceding order, so let's
diff --git a/arch/powerpc/kvm/book3s_emulate.c b/arch/powerpc/kvm/book3s_emulate.c
index 99d40f8..45d0a80 100644
--- a/arch/powerpc/kvm/book3s_emulate.c
+++ b/arch/powerpc/kvm/book3s_emulate.c
@@ -80,7 +80,7 @@ static bool spr_allowed(struct kvm_vcpu *vcpu, enum priv_level level)
 		return false;
 
 	/* Limit user space to its own small SPR set */
-	if ((vcpu->arch.shared->msr & MSR_PR) && level > PRIV_PROBLEM)
+	if ((kvmppc_get_msr(vcpu) & MSR_PR) && level > PRIV_PROBLEM)
 		return false;
 
 	return true;
@@ -100,8 +100,8 @@ int kvmppc_core_emulate_op_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
 		switch (get_xop(inst)) {
 		case OP_19_XOP_RFID:
 		case OP_19_XOP_RFI:
-			kvmppc_set_pc(vcpu, vcpu->arch.shared->srr0);
-			kvmppc_set_msr(vcpu, vcpu->arch.shared->srr1);
+			kvmppc_set_pc(vcpu, kvmppc_get_srr0(vcpu));
+			kvmppc_set_msr(vcpu, kvmppc_get_srr1(vcpu));
 			*advance = 0;
 			break;
 
@@ -113,16 +113,16 @@ int kvmppc_core_emulate_op_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
 	case 31:
 		switch (get_xop(inst)) {
 		case OP_31_XOP_MFMSR:
-			kvmppc_set_gpr(vcpu, rt, vcpu->arch.shared->msr);
+			kvmppc_set_gpr(vcpu, rt, kvmppc_get_msr(vcpu));
 			break;
 		case OP_31_XOP_MTMSRD:
 		{
 			ulong rs_val = kvmppc_get_gpr(vcpu, rs);
 			if (inst & 0x10000) {
-				ulong new_msr = vcpu->arch.shared->msr;
+				ulong new_msr = kvmppc_get_msr(vcpu);
 				new_msr &= ~(MSR_RI | MSR_EE);
 				new_msr |= rs_val & (MSR_RI | MSR_EE);
-				vcpu->arch.shared->msr = new_msr;
+				kvmppc_set_msr_fast(vcpu, new_msr);
 			} else
 				kvmppc_set_msr(vcpu, rs_val);
 			break;
@@ -179,7 +179,7 @@ int kvmppc_core_emulate_op_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
 			ulong cmd = kvmppc_get_gpr(vcpu, 3);
 			int i;
 
-		        if ((vcpu->arch.shared->msr & MSR_PR) ||
+		        if ((kvmppc_get_msr(vcpu) & MSR_PR) ||
 			    !vcpu->arch.papr_enabled) {
 				emulated = EMULATE_FAIL;
 				break;
@@ -261,14 +261,14 @@ int kvmppc_core_emulate_op_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
 				ra_val = kvmppc_get_gpr(vcpu, ra);
 
 			addr = (ra_val + rb_val) & ~31ULL;
-			if (!(vcpu->arch.shared->msr & MSR_SF))
+			if (!(kvmppc_get_msr(vcpu) & MSR_SF))
 				addr &= 0xffffffff;
 			vaddr = addr;
 
 			r = kvmppc_st(vcpu, &addr, 32, zeros, true);
 			if ((r == -ENOENT) || (r == -EPERM)) {
 				*advance = 0;
-				vcpu->arch.shared->dar = vaddr;
+				kvmppc_set_dar(vcpu, vaddr);
 				vcpu->arch.fault_dar = vaddr;
 
 				dsisr = DSISR_ISSTORE;
@@ -277,7 +277,7 @@ int kvmppc_core_emulate_op_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
 				else if (r == -EPERM)
 					dsisr |= DSISR_PROTFAULT;
 
-				vcpu->arch.shared->dsisr = dsisr;
+				kvmppc_set_dsisr(vcpu, dsisr);
 				vcpu->arch.fault_dsisr = dsisr;
 
 				kvmppc_book3s_queue_irqprio(vcpu,
@@ -356,10 +356,10 @@ int kvmppc_core_emulate_mtspr_pr(struct kvm_vcpu *vcpu, int sprn, ulong spr_val)
 		to_book3s(vcpu)->sdr1 = spr_val;
 		break;
 	case SPRN_DSISR:
-		vcpu->arch.shared->dsisr = spr_val;
+		kvmppc_set_dsisr(vcpu, spr_val);
 		break;
 	case SPRN_DAR:
-		vcpu->arch.shared->dar = spr_val;
+		kvmppc_set_dar(vcpu, spr_val);
 		break;
 	case SPRN_HIOR:
 		to_book3s(vcpu)->hior = spr_val;
@@ -493,10 +493,10 @@ int kvmppc_core_emulate_mfspr_pr(struct kvm_vcpu *vcpu, int sprn, ulong *spr_val
 		*spr_val = to_book3s(vcpu)->sdr1;
 		break;
 	case SPRN_DSISR:
-		*spr_val = vcpu->arch.shared->dsisr;
+		*spr_val = kvmppc_get_dsisr(vcpu);
 		break;
 	case SPRN_DAR:
-		*spr_val = vcpu->arch.shared->dar;
+		*spr_val = kvmppc_get_dar(vcpu);
 		break;
 	case SPRN_HIOR:
 		*spr_val = to_book3s(vcpu)->hior;
diff --git a/arch/powerpc/kvm/book3s_exports.c b/arch/powerpc/kvm/book3s_exports.c
index 20d4ea8..0d013fb 100644
--- a/arch/powerpc/kvm/book3s_exports.c
+++ b/arch/powerpc/kvm/book3s_exports.c
@@ -18,6 +18,7 @@
  */
 
 #include <linux/export.h>
+#include <asm/kvm_ppc.h>
 #include <asm/kvm_book3s.h>
 
 #ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 8227dba..030821a 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -1280,6 +1280,17 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_hv(struct kvm *kvm,
 		goto free_vcpu;
 
 	vcpu->arch.shared = &vcpu->arch.shregs;
+#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
+	/*
+	 * The shared struct is never shared on HV,
+	 * so we can always use host endianness
+	 */
+#ifdef __BIG_ENDIAN__
+	vcpu->arch.shared_big_endian = true;
+#else
+	vcpu->arch.shared_big_endian = false;
+#endif
+#endif
 	vcpu->arch.mmcr[0] = MMCR0_FC;
 	vcpu->arch.ctrl = CTRL_RUNLATCH;
 	/* default to host PVR, since we can't spoof it */
diff --git a/arch/powerpc/kvm/book3s_interrupts.S b/arch/powerpc/kvm/book3s_interrupts.S
index 3533c99..e2c29e3 100644
--- a/arch/powerpc/kvm/book3s_interrupts.S
+++ b/arch/powerpc/kvm/book3s_interrupts.S
@@ -104,8 +104,27 @@ kvm_start_lightweight:
 	stb	r3, HSTATE_RESTORE_HID5(r13)
 
 	/* Load up guest SPRG3 value, since it's user readable */
-	ld	r3, VCPU_SHARED(r4)
-	ld	r3, VCPU_SHARED_SPRG3(r3)
+	lwz	r3, VCPU_SHAREDBE(r4)
+	cmpwi	r3, 0
+	ld	r5, VCPU_SHARED(r4)
+	beq	sprg3_little_endian
+sprg3_big_endian:
+#ifdef __BIG_ENDIAN__
+	ld	r3, VCPU_SHARED_SPRG3(r5)
+#else
+	addi	r5, r5, VCPU_SHARED_SPRG3
+	ldbrx	r3, 0, r5
+#endif
+	b	after_sprg3_load
+sprg3_little_endian:
+#ifdef __LITTLE_ENDIAN__
+	ld	r3, VCPU_SHARED_SPRG3(r5)
+#else
+	addi	r5, r5, VCPU_SHARED_SPRG3
+	ldbrx	r3, 0, r5
+#endif
+
+after_sprg3_load:
 	mtspr	SPRN_SPRG3, r3
 #endif /* CONFIG_PPC_BOOK3S_64 */
 
diff --git a/arch/powerpc/kvm/book3s_paired_singles.c b/arch/powerpc/kvm/book3s_paired_singles.c
index c1abd95..6c8011f 100644
--- a/arch/powerpc/kvm/book3s_paired_singles.c
+++ b/arch/powerpc/kvm/book3s_paired_singles.c
@@ -165,16 +165,18 @@ static inline void kvmppc_sync_qpr(struct kvm_vcpu *vcpu, int rt)
 
 static void kvmppc_inject_pf(struct kvm_vcpu *vcpu, ulong eaddr, bool is_store)
 {
-	u64 dsisr;
-	struct kvm_vcpu_arch_shared *shared = vcpu->arch.shared;
+	u32 dsisr;
+	u64 msr = kvmppc_get_msr(vcpu);
 
-	shared->msr = kvmppc_set_field(shared->msr, 33, 36, 0);
-	shared->msr = kvmppc_set_field(shared->msr, 42, 47, 0);
-	shared->dar = eaddr;
+	msr = kvmppc_set_field(msr, 33, 36, 0);
+	msr = kvmppc_set_field(msr, 42, 47, 0);
+	kvmppc_set_msr(vcpu, msr);
+	kvmppc_set_dar(vcpu, eaddr);
 	/* Page Fault */
 	dsisr = kvmppc_set_field(0, 33, 33, 1);
 	if (is_store)
-		shared->dsisr = kvmppc_set_field(dsisr, 38, 38, 1);
+		dsisr = kvmppc_set_field(dsisr, 38, 38, 1);
+	kvmppc_set_dsisr(vcpu, dsisr);
 	kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_DATA_STORAGE);
 }
 
@@ -660,7 +662,7 @@ int kvmppc_emulate_paired_single(struct kvm_run *run, struct kvm_vcpu *vcpu)
 	if (!kvmppc_inst_is_paired_single(vcpu, inst))
 		return EMULATE_FAIL;
 
-	if (!(vcpu->arch.shared->msr & MSR_FP)) {
+	if (!(kvmppc_get_msr(vcpu) & MSR_FP)) {
 		kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL);
 		return EMULATE_AGAIN;
 	}
diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index d7b0ad2..d424ca0 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -246,14 +246,15 @@ static void kvm_set_spte_hva_pr(struct kvm *kvm, unsigned long hva, pte_t pte)
 
 static void kvmppc_recalc_shadow_msr(struct kvm_vcpu *vcpu)
 {
-	ulong smsr = vcpu->arch.shared->msr;
+	ulong guest_msr = kvmppc_get_msr(vcpu);
+	ulong smsr = guest_msr;
 
 	/* Guest MSR values */
 	smsr &= MSR_FE0 | MSR_FE1 | MSR_SF | MSR_SE | MSR_BE | MSR_LE;
 	/* Process MSR values */
 	smsr |= MSR_ME | MSR_RI | MSR_IR | MSR_DR | MSR_PR | MSR_EE;
 	/* External providers the guest reserved */
-	smsr |= (vcpu->arch.shared->msr & vcpu->arch.guest_owned_ext);
+	smsr |= (guest_msr & vcpu->arch.guest_owned_ext);
 	/* 64-bit Process MSR values */
 #ifdef CONFIG_PPC_BOOK3S_64
 	smsr |= MSR_ISF | MSR_HV;
@@ -263,14 +264,14 @@ static void kvmppc_recalc_shadow_msr(struct kvm_vcpu *vcpu)
 
 static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
 {
-	ulong old_msr = vcpu->arch.shared->msr;
+	ulong old_msr = kvmppc_get_msr(vcpu);
 
 #ifdef EXIT_DEBUG
 	printk(KERN_INFO "KVM: Set MSR to 0x%llx\n", msr);
 #endif
 
 	msr &= to_book3s(vcpu)->msr_mask;
-	vcpu->arch.shared->msr = msr;
+	kvmppc_set_msr_fast(vcpu, msr);
 	kvmppc_recalc_shadow_msr(vcpu);
 
 	if (msr & MSR_POW) {
@@ -281,11 +282,11 @@ static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
 
 			/* Unset POW bit after we woke up */
 			msr &= ~MSR_POW;
-			vcpu->arch.shared->msr = msr;
+			kvmppc_set_msr_fast(vcpu, msr);
 		}
 	}
 
-	if ((vcpu->arch.shared->msr & (MSR_PR|MSR_IR|MSR_DR)) !=
+	if ((kvmppc_get_msr(vcpu) & (MSR_PR|MSR_IR|MSR_DR)) !=
 		   (old_msr & (MSR_PR|MSR_IR|MSR_DR))) {
 		kvmppc_mmu_flush_segments(vcpu);
 		kvmppc_mmu_map_segment(vcpu, kvmppc_get_pc(vcpu));
@@ -317,7 +318,7 @@ static void kvmppc_set_msr_pr(struct kvm_vcpu *vcpu, u64 msr)
 	}
 
 	/* Preload FPU if it's enabled */
-	if (vcpu->arch.shared->msr & MSR_FP)
+	if (kvmppc_get_msr(vcpu) & MSR_FP)
 		kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
 }
 
@@ -438,7 +439,7 @@ static int kvmppc_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
 {
 	ulong mp_pa = vcpu->arch.magic_page_pa;
 
-	if (!(vcpu->arch.shared->msr & MSR_SF))
+	if (!(kvmppc_get_msr(vcpu) & MSR_SF))
 		mp_pa = (uint32_t)mp_pa;
 
 	if (unlikely(mp_pa) &&
@@ -459,8 +460,8 @@ int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
 	int page_found = 0;
 	struct kvmppc_pte pte;
 	bool is_mmio = false;
-	bool dr = (vcpu->arch.shared->msr & MSR_DR) ? true : false;
-	bool ir = (vcpu->arch.shared->msr & MSR_IR) ? true : false;
+	bool dr = (kvmppc_get_msr(vcpu) & MSR_DR) ? true : false;
+	bool ir = (kvmppc_get_msr(vcpu) & MSR_IR) ? true : false;
 	u64 vsid;
 
 	relocated = data ? dr : ir;
@@ -480,7 +481,7 @@ int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
 		pte.page_size = MMU_PAGE_64K;
 	}
 
-	switch (vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) {
+	switch (kvmppc_get_msr(vcpu) & (MSR_DR|MSR_IR)) {
 	case 0:
 		pte.vpage |= ((u64)VSID_REAL << (SID_SHIFT - 12));
 		break;
@@ -488,7 +489,7 @@ int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
 	case MSR_IR:
 		vcpu->arch.mmu.esid_to_vsid(vcpu, eaddr >> SID_SHIFT, &vsid);
 
-		if ((vcpu->arch.shared->msr & (MSR_DR|MSR_IR)) == MSR_DR)
+		if ((kvmppc_get_msr(vcpu) & (MSR_DR|MSR_IR)) == MSR_DR)
 			pte.vpage |= ((u64)VSID_REAL_DR << (SID_SHIFT - 12));
 		else
 			pte.vpage |= ((u64)VSID_REAL_IR << (SID_SHIFT - 12));
@@ -511,22 +512,25 @@ int kvmppc_handle_pagefault(struct kvm_run *run, struct kvm_vcpu *vcpu,
 
 	if (page_found == -ENOENT) {
 		/* Page not found in guest PTE entries */
-		vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
-		vcpu->arch.shared->dsisr = vcpu->arch.fault_dsisr;
-		vcpu->arch.shared->msr |=
-			vcpu->arch.shadow_srr1 & 0x00000000f8000000ULL;
+		u64 ssrr1 = vcpu->arch.shadow_srr1;
+		u64 msr = kvmppc_get_msr(vcpu);
+		kvmppc_set_dar(vcpu, kvmppc_get_fault_dar(vcpu));
+		kvmppc_set_dsisr(vcpu, vcpu->arch.fault_dsisr);
+		kvmppc_set_msr_fast(vcpu, msr | (ssrr1 & 0xf8000000ULL));
 		kvmppc_book3s_queue_irqprio(vcpu, vec);
 	} else if (page_found == -EPERM) {
 		/* Storage protection */
-		vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
-		vcpu->arch.shared->dsisr = vcpu->arch.fault_dsisr & ~DSISR_NOHPTE;
-		vcpu->arch.shared->dsisr |= DSISR_PROTFAULT;
-		vcpu->arch.shared->msr |=
-			vcpu->arch.shadow_srr1 & 0x00000000f8000000ULL;
+		u32 dsisr = vcpu->arch.fault_dsisr;
+		u64 ssrr1 = vcpu->arch.shadow_srr1;
+		u64 msr = kvmppc_get_msr(vcpu);
+		kvmppc_set_dar(vcpu, kvmppc_get_fault_dar(vcpu));
+		dsisr = (dsisr & ~DSISR_NOHPTE) | DSISR_PROTFAULT;
+		kvmppc_set_dsisr(vcpu, dsisr);
+		kvmppc_set_msr_fast(vcpu, msr | (ssrr1 & 0xf8000000ULL));
 		kvmppc_book3s_queue_irqprio(vcpu, vec);
 	} else if (page_found == -EINVAL) {
 		/* Page not found in guest SLB */
-		vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
+		kvmppc_set_dar(vcpu, kvmppc_get_fault_dar(vcpu));
 		kvmppc_book3s_queue_irqprio(vcpu, vec + 0x80);
 	} else if (!is_mmio &&
 		   kvmppc_visible_gfn(vcpu, pte.raddr >> PAGE_SHIFT)) {
@@ -614,11 +618,12 @@ static int kvmppc_read_inst(struct kvm_vcpu *vcpu)
 
 	ret = kvmppc_ld(vcpu, &srr0, sizeof(u32), &last_inst, false);
 	if (ret == -ENOENT) {
-		ulong msr = vcpu->arch.shared->msr;
+		ulong msr = kvmppc_get_msr(vcpu);
 
 		msr = kvmppc_set_field(msr, 33, 33, 1);
 		msr = kvmppc_set_field(msr, 34, 36, 0);
-		vcpu->arch.shared->msr = kvmppc_set_field(msr, 42, 47, 0);
+		msr = kvmppc_set_field(msr, 42, 47, 0);
+		kvmppc_set_msr_fast(vcpu, msr);
 		kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_INST_STORAGE);
 		return EMULATE_AGAIN;
 	}
@@ -651,7 +656,7 @@ static int kvmppc_handle_ext(struct kvm_vcpu *vcpu, unsigned int exit_nr,
 	if (vcpu->arch.hflags & BOOK3S_HFLAG_PAIRED_SINGLE)
 		return RESUME_GUEST;
 
-	if (!(vcpu->arch.shared->msr & msr)) {
+	if (!(kvmppc_get_msr(vcpu) & msr)) {
 		kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 		return RESUME_GUEST;
 	}
@@ -792,7 +797,9 @@ int kvmppc_handle_exit_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
 			kvmppc_mmu_pte_flush(vcpu, kvmppc_get_pc(vcpu), ~0xFFFUL);
 			r = RESUME_GUEST;
 		} else {
-			vcpu->arch.shared->msr |= shadow_srr1 & 0x58000000;
+			u64 msr = kvmppc_get_msr(vcpu);
+			msr |= shadow_srr1 & 0x58000000;
+			kvmppc_set_msr_fast(vcpu, msr);
 			kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 			r = RESUME_GUEST;
 		}
@@ -832,8 +839,8 @@ int kvmppc_handle_exit_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
 			r = kvmppc_handle_pagefault(run, vcpu, dar, exit_nr);
 			srcu_read_unlock(&vcpu->kvm->srcu, idx);
 		} else {
-			vcpu->arch.shared->dar = dar;
-			vcpu->arch.shared->dsisr = fault_dsisr;
+			kvmppc_set_dar(vcpu, dar);
+			kvmppc_set_dsisr(vcpu, fault_dsisr);
 			kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 			r = RESUME_GUEST;
 		}
@@ -841,7 +848,7 @@ int kvmppc_handle_exit_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
 	}
 	case BOOK3S_INTERRUPT_DATA_SEGMENT:
 		if (kvmppc_mmu_map_segment(vcpu, kvmppc_get_fault_dar(vcpu)) < 0) {
-			vcpu->arch.shared->dar = kvmppc_get_fault_dar(vcpu);
+			kvmppc_set_dar(vcpu, kvmppc_get_fault_dar(vcpu));
 			kvmppc_book3s_queue_irqprio(vcpu,
 				BOOK3S_INTERRUPT_DATA_SEGMENT);
 		}
@@ -879,7 +886,7 @@ int kvmppc_handle_exit_pr(struct kvm_run *run, struct kvm_vcpu *vcpu,
 program_interrupt:
 		flags = vcpu->arch.shadow_srr1 & 0x1f0000ull;
 
-		if (vcpu->arch.shared->msr & MSR_PR) {
+		if (kvmppc_get_msr(vcpu) & MSR_PR) {
 #ifdef EXIT_DEBUG
 			printk(KERN_INFO "Userspace triggered 0x700 exception at 0x%lx (0x%x)\n", kvmppc_get_pc(vcpu), kvmppc_get_last_inst(vcpu));
 #endif
@@ -921,7 +928,7 @@ program_interrupt:
 	case BOOK3S_INTERRUPT_SYSCALL:
 		if (vcpu->arch.papr_enabled &&
 		    (kvmppc_get_last_sc(vcpu) == 0x44000022) &&
-		    !(vcpu->arch.shared->msr & MSR_PR)) {
+		    !(kvmppc_get_msr(vcpu) & MSR_PR)) {
 			/* SC 1 papr hypercalls */
 			ulong cmd = kvmppc_get_gpr(vcpu, 3);
 			int i;
@@ -953,7 +960,7 @@ program_interrupt:
 				gprs[i] = kvmppc_get_gpr(vcpu, i);
 			vcpu->arch.osi_needed = 1;
 			r = RESUME_HOST_NV;
-		} else if (!(vcpu->arch.shared->msr & MSR_PR) &&
+		} else if (!(kvmppc_get_msr(vcpu) & MSR_PR) &&
 		    (((u32)kvmppc_get_gpr(vcpu, 0)) == KVM_SC_MAGIC_R0)) {
 			/* KVM PV hypercalls */
 			kvmppc_set_gpr(vcpu, 3, kvmppc_kvm_pv(vcpu));
@@ -994,10 +1001,16 @@ program_interrupt:
 	}
 	case BOOK3S_INTERRUPT_ALIGNMENT:
 		if (kvmppc_read_inst(vcpu) == EMULATE_DONE) {
-			vcpu->arch.shared->dsisr = kvmppc_alignment_dsisr(vcpu,
-				kvmppc_get_last_inst(vcpu));
-			vcpu->arch.shared->dar = kvmppc_alignment_dar(vcpu,
-				kvmppc_get_last_inst(vcpu));
+			u32 last_inst = kvmppc_get_last_inst(vcpu);
+			u32 dsisr;
+			u64 dar;
+
+			dsisr = kvmppc_alignment_dsisr(vcpu, last_inst);
+			dar = kvmppc_alignment_dar(vcpu, last_inst);
+
+			kvmppc_set_dsisr(vcpu, dsisr);
+			kvmppc_set_dar(vcpu, dar);
+
 			kvmppc_book3s_queue_irqprio(vcpu, exit_nr);
 		}
 		r = RESUME_GUEST;
@@ -1062,7 +1075,7 @@ static int kvm_arch_vcpu_ioctl_get_sregs_pr(struct kvm_vcpu *vcpu,
 		}
 	} else {
 		for (i = 0; i < 16; i++)
-			sregs->u.s.ppc32.sr[i] = vcpu->arch.shared->sr[i];
+			sregs->u.s.ppc32.sr[i] = kvmppc_get_sr(vcpu, i);
 
 		for (i = 0; i < 8; i++) {
 			sregs->u.s.ppc32.ibat[i] = vcpu3s->ibat[i].raw;
@@ -1198,8 +1211,14 @@ static struct kvm_vcpu *kvmppc_core_vcpu_create_pr(struct kvm *kvm,
 		goto uninit_vcpu;
 	/* the real shared page fills the last 4k of our page */
 	vcpu->arch.shared = (void *)(p + PAGE_SIZE - 4096);
-
 #ifdef CONFIG_PPC_BOOK3S_64
+	/* Always start the shared struct in native endian mode */
+#ifdef __BIG_ENDIAN__
+        vcpu->arch.shared_big_endian = true;
+#else
+        vcpu->arch.shared_big_endian = false;
+#endif
+
 	/*
 	 * Default to the same as the host if we're on sufficiently
 	 * recent machine that we have 1TB segments;
@@ -1293,7 +1312,7 @@ static int kvmppc_vcpu_run_pr(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
 #endif
 
 	/* Preload FPU if it's enabled */
-	if (vcpu->arch.shared->msr & MSR_FP)
+	if (kvmppc_get_msr(vcpu) & MSR_FP)
 		kvmppc_handle_ext(vcpu, BOOK3S_INTERRUPT_FP_UNAVAIL, MSR_FP);
 
 	kvmppc_fix_ee_before_entry();
diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c
index 255e5b1..52a63bf 100644
--- a/arch/powerpc/kvm/book3s_pr_papr.c
+++ b/arch/powerpc/kvm/book3s_pr_papr.c
@@ -278,7 +278,7 @@ int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd)
 	case H_PUT_TCE:
 		return kvmppc_h_pr_put_tce(vcpu);
 	case H_CEDE:
-		vcpu->arch.shared->msr |= MSR_EE;
+		kvmppc_set_msr_fast(vcpu, kvmppc_get_msr(vcpu) | MSR_EE);
 		kvm_vcpu_block(vcpu);
 		clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
 		vcpu->stat.halt_wakeup++;
diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c
index c2b887b..da86d9b 100644
--- a/arch/powerpc/kvm/emulate.c
+++ b/arch/powerpc/kvm/emulate.c
@@ -97,10 +97,10 @@ static int kvmppc_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
 
 	switch (sprn) {
 	case SPRN_SRR0:
-		vcpu->arch.shared->srr0 = spr_val;
+		kvmppc_set_srr0(vcpu, spr_val);
 		break;
 	case SPRN_SRR1:
-		vcpu->arch.shared->srr1 = spr_val;
+		kvmppc_set_srr1(vcpu, spr_val);
 		break;
 
 	/* XXX We need to context-switch the timebase for
@@ -114,16 +114,16 @@ static int kvmppc_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
 		break;
 
 	case SPRN_SPRG0:
-		vcpu->arch.shared->sprg0 = spr_val;
+		kvmppc_set_sprg0(vcpu, spr_val);
 		break;
 	case SPRN_SPRG1:
-		vcpu->arch.shared->sprg1 = spr_val;
+		kvmppc_set_sprg1(vcpu, spr_val);
 		break;
 	case SPRN_SPRG2:
-		vcpu->arch.shared->sprg2 = spr_val;
+		kvmppc_set_sprg2(vcpu, spr_val);
 		break;
 	case SPRN_SPRG3:
-		vcpu->arch.shared->sprg3 = spr_val;
+		kvmppc_set_sprg3(vcpu, spr_val);
 		break;
 
 	/* PIR can legally be written, but we ignore it */
@@ -150,10 +150,10 @@ static int kvmppc_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
 
 	switch (sprn) {
 	case SPRN_SRR0:
-		spr_val = vcpu->arch.shared->srr0;
+		spr_val = kvmppc_get_srr0(vcpu);
 		break;
 	case SPRN_SRR1:
-		spr_val = vcpu->arch.shared->srr1;
+		spr_val = kvmppc_get_srr1(vcpu);
 		break;
 	case SPRN_PVR:
 		spr_val = vcpu->arch.pvr;
@@ -173,16 +173,16 @@ static int kvmppc_emulate_mfspr(struct kvm_vcpu *vcpu, int sprn, int rt)
 		break;
 
 	case SPRN_SPRG0:
-		spr_val = vcpu->arch.shared->sprg0;
+		spr_val = kvmppc_get_sprg0(vcpu);
 		break;
 	case SPRN_SPRG1:
-		spr_val = vcpu->arch.shared->sprg1;
+		spr_val = kvmppc_get_sprg1(vcpu);
 		break;
 	case SPRN_SPRG2:
-		spr_val = vcpu->arch.shared->sprg2;
+		spr_val = kvmppc_get_sprg2(vcpu);
 		break;
 	case SPRN_SPRG3:
-		spr_val = vcpu->arch.shared->sprg3;
+		spr_val = kvmppc_get_sprg3(vcpu);
 		break;
 	/* Note: SPRG4-7 are user-readable, so we don't get
 	 * a trap. */
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index a9bd0ff..b4e15bf 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -125,6 +125,27 @@ int kvmppc_prepare_to_enter(struct kvm_vcpu *vcpu)
 }
 EXPORT_SYMBOL_GPL(kvmppc_prepare_to_enter);
 
+#if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_KVM_BOOK3S_PR_POSSIBLE)
+static void kvmppc_swab_shared(struct kvm_vcpu *vcpu)
+{
+	struct kvm_vcpu_arch_shared *shared = vcpu->arch.shared;
+	int i;
+
+	shared->sprg0 = swab64(shared->sprg0);
+	shared->sprg1 = swab64(shared->sprg1);
+	shared->sprg2 = swab64(shared->sprg2);
+	shared->sprg3 = swab64(shared->sprg3);
+	shared->srr0 = swab64(shared->srr0);
+	shared->srr1 = swab64(shared->srr1);
+	shared->dar = swab64(shared->dar);
+	shared->msr = swab64(shared->msr);
+	shared->dsisr = swab32(shared->dsisr);
+	shared->int_pending = swab32(shared->int_pending);
+	for (i = 0; i < ARRAY_SIZE(shared->sr); i++)
+		shared->sr[i] = swab32(shared->sr[i]);
+}
+#endif
+
 int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
 {
 	int nr = kvmppc_get_gpr(vcpu, 11);
@@ -135,7 +156,7 @@ int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
 	unsigned long __maybe_unused param4 = kvmppc_get_gpr(vcpu, 6);
 	unsigned long r2 = 0;
 
-	if (!(vcpu->arch.shared->msr & MSR_SF)) {
+	if (!(kvmppc_get_msr(vcpu) & MSR_SF)) {
 		/* 32 bit mode */
 		param1 &= 0xffffffff;
 		param2 &= 0xffffffff;
@@ -146,6 +167,16 @@ int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
 	switch (nr) {
 	case KVM_HCALL_TOKEN(KVM_HC_PPC_MAP_MAGIC_PAGE):
 	{
+#if defined(CONFIG_PPC_BOOK3S_64) && defined(CONFIG_KVM_BOOK3S_PR_POSSIBLE)
+		/* Book3S can be little endian, find it out here */
+		int shared_big_endian = true;
+		if (vcpu->arch.intr_msr & MSR_LE)
+			shared_big_endian = false;
+		if (shared_big_endian != vcpu->arch.shared_big_endian)
+			kvmppc_swab_shared(vcpu);
+		vcpu->arch.shared_big_endian = shared_big_endian;
+#endif
+
 		vcpu->arch.magic_page_pa = param1;
 		vcpu->arch.magic_page_ea = param2;
 
diff --git a/arch/powerpc/kvm/trace_pr.h b/arch/powerpc/kvm/trace_pr.h
index 8b22e47..e1357cd 100644
--- a/arch/powerpc/kvm/trace_pr.h
+++ b/arch/powerpc/kvm/trace_pr.h
@@ -255,7 +255,7 @@ TRACE_EVENT(kvm_exit,
 		__entry->exit_nr	= exit_nr;
 		__entry->pc		= kvmppc_get_pc(vcpu);
 		__entry->dar		= kvmppc_get_fault_dar(vcpu);
-		__entry->msr		= vcpu->arch.shared->msr;
+		__entry->msr		= kvmppc_get_msr(vcpu);
 		__entry->srr1		= vcpu->arch.shadow_srr1;
 		__entry->last_inst	= vcpu->arch.last_inst;
 	),