Add support for the H_SET_MODE hcall so we can select the
endianness of our exceptions.

We create a guest MSR from scratch when delivering exceptions in
a few places and instead of extracing the LPCR[ILE] and inserting
it into MSR_LE each time simply create a new variable intr_msr which
contains the entire MSR to use.

Signed-off-by: Anton Blanchard<redacted>
Cc: Alexander Graf<redacted>
---
  arch/powerpc/include/asm/kvm_host.h     |  1 +
  arch/powerpc/kernel/asm-offsets.c       |  1 +
  arch/powerpc/kvm/book3s_64_mmu_hv.c     |  2 +-
  arch/powerpc/kvm/book3s_hv.c            | 44 +++++++++++++++++++++++++++++++++
  arch/powerpc/kvm/book3s_hv_rmhandlers.S | 15 ++++-------
  5 files changed, 52 insertions(+), 11 deletions(-)

diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 3328353..50f204e 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h

@@ -605,6 +605,7 @@ struct kvm_vcpu_arch {
  	spinlock_t tbacct_lock;
  	u64 busy_stolen;
  	u64 busy_preempt;
+	unsigned long intr_msr;
  #endif
  };

diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index d8958be..3967b15 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c

@@ -490,6 +490,7 @@ int main(void)
  	DEFINE(VCPU_DAR, offsetof(struct kvm_vcpu, arch.shregs.dar));
  	DEFINE(VCPU_VPA, offsetof(struct kvm_vcpu, arch.vpa.pinned_addr));
  	DEFINE(VCPU_VPA_DIRTY, offsetof(struct kvm_vcpu, arch.vpa.dirty));
+	DEFINE(VCPU_INTR_MSR, offsetof(struct kvm_vcpu, arch.intr_msr));
  #endif
  #ifdef CONFIG_PPC_BOOK3S
  	DEFINE(VCPU_VCPUID, offsetof(struct kvm_vcpu, vcpu_id));

diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c
index 043eec8..30459bd 100644
--- a/arch/powerpc/kvm/book3s_64_mmu_hv.c
+++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c

@@ -266,7 +266,7 @@ void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)

  static void kvmppc_mmu_book3s_64_hv_reset_msr(struct kvm_vcpu *vcpu)
  {
-	kvmppc_set_msr(vcpu, MSR_SF | MSR_ME);
+	kvmppc_set_msr(vcpu, vcpu->arch.intr_msr);
  }

  /*

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 62a2b5a..c9b90b8 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c

@@ -503,6 +503,43 @@ static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu,
  	vcpu->arch.dtl.dirty = true;
  }

+static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags,
+			     unsigned long resource, unsigned long value1,
+			     unsigned long value2)
+{
+	struct kvm *kvm = vcpu->kvm;
+	struct kvm_vcpu *v;
+	int n;
+
+	if (resource == 4) {
+		if (value1)
+			return H_P3;
+		if (value2)
+			return H_P4;
+
+		switch (mflags) {
+		case 0:
+			kvm->arch.lpcr&= ~LPCR_ILE;