[PATCH 3/7] KVM: PPC: Book3S HV: Access guest VPA in BE

[Alexander Graf <agraf@xxxxxxx>]

There are a few shared data structures between the host and the guest. Most
of them get registered through the VPA interface.

These data structures are defined to always be in big endian byte order, so
let's make sure we always access them in big endian.

Signed-off-by: Alexander Graf <agraf@xxxxxxx>

---

v1 -> v2:

  - Add __be hints
  - Fix dtl_idx
---
 arch/powerpc/kvm/book3s_hv.c     | 22 +++++++++++-----------
 arch/powerpc/kvm/book3s_hv_ras.c |  6 +++---
 2 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 1562acf..f7bcc72 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -270,7 +270,7 @@ struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
 static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
 {
 	vpa->__old_status |= LPPACA_OLD_SHARED_PROC;
-	vpa->yield_count = 1;
+	vpa->yield_count = cpu_to_be32(1);
 }
 
 static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v,
@@ -293,8 +293,8 @@ static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v,
 struct reg_vpa {
 	u32 dummy;
 	union {
-		u16 hword;
-		u32 word;
+		__be16 hword;
+		__be32 word;
 	} length;
 };
 
@@ -333,9 +333,9 @@ static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
 		if (va == NULL)
 			return H_PARAMETER;
 		if (subfunc == H_VPA_REG_VPA)
-			len = ((struct reg_vpa *)va)->length.hword;
+			len = be16_to_cpu(((struct reg_vpa *)va)->length.hword);
 		else
-			len = ((struct reg_vpa *)va)->length.word;
+			len = be32_to_cpu(((struct reg_vpa *)va)->length.word);
 		kvmppc_unpin_guest_page(kvm, va, vpa, false);
 
 		/* Check length */
@@ -540,18 +540,18 @@ static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu,
 		return;
 	memset(dt, 0, sizeof(struct dtl_entry));
 	dt->dispatch_reason = 7;
-	dt->processor_id = vc->pcpu + vcpu->arch.ptid;
-	dt->timebase = now + vc->tb_offset;
-	dt->enqueue_to_dispatch_time = stolen;
-	dt->srr0 = kvmppc_get_pc(vcpu);
-	dt->srr1 = vcpu->arch.shregs.msr;
+	dt->processor_id = cpu_to_be16(vc->pcpu + vcpu->arch.ptid);
+	dt->timebase = cpu_to_be64(now + vc->tb_offset);
+	dt->enqueue_to_dispatch_time = cpu_to_be32(stolen);
+	dt->srr0 = cpu_to_be64(kvmppc_get_pc(vcpu));
+	dt->srr1 = cpu_to_be64(vcpu->arch.shregs.msr);
 	++dt;
 	if (dt == vcpu->arch.dtl.pinned_end)
 		dt = vcpu->arch.dtl.pinned_addr;
 	vcpu->arch.dtl_ptr = dt;
 	/* order writing *dt vs. writing vpa->dtl_idx */
 	smp_wmb();
-	vpa->dtl_idx = ++vcpu->arch.dtl_index;
+	vpa->dtl_idx = cpu_to_be64(++vcpu->arch.dtl_index);
 	vcpu->arch.dtl.dirty = true;
 }
 
diff --git a/arch/powerpc/kvm/book3s_hv_ras.c b/arch/powerpc/kvm/book3s_hv_ras.c
index 768a9f9..6a3ba8a 100644
--- a/arch/powerpc/kvm/book3s_hv_ras.c
+++ b/arch/powerpc/kvm/book3s_hv_ras.c
@@ -45,14 +45,14 @@ static void reload_slb(struct kvm_vcpu *vcpu)
 		return;
 
 	/* Sanity check */
-	n = min_t(u32, slb->persistent, SLB_MIN_SIZE);
+	n = min_t(u32, be32_to_cpu(slb->persistent), SLB_MIN_SIZE);
 	if ((void *) &slb->save_area[n] > vcpu->arch.slb_shadow.pinned_end)
 		return;
 
 	/* Load up the SLB from that */
 	for (i = 0; i < n; ++i) {
-		unsigned long rb = slb->save_area[i].esid;
-		unsigned long rs = slb->save_area[i].vsid;
+		unsigned long rb = be64_to_cpu(slb->save_area[i].esid);
+		unsigned long rs = be64_to_cpu(slb->save_area[i].vsid);
 
 		rb = (rb & ~0xFFFul) | i;	/* insert entry number */
 		asm volatile("slbmte %0,%1" : : "r" (rs), "r" (rb));
-- 
1.8.1.4

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