[PATCH kernel] KVM: PPC: Add MMIO emulation for stdx (store doubleword indexed)

[Alexey Kardashevskiy]

This adds missing stdx emulation which allow Mellanox driver from
recent kernels work when MMIO emulation is enforced in the userspace.

Signed-off-by: Alexey Kardashevskiy <aik at ozlabs.ru>
---
 arch/powerpc/include/asm/ppc-opcode.h | 1 +
 arch/powerpc/kvm/emulate_loadstore.c  | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/arch/powerpc/include/asm/ppc-opcode.h b/arch/powerpc/include/asm/ppc-opcode.h
index e7d6d86563ee..ca1bbe49590b 100644
--- a/arch/powerpc/include/asm/ppc-opcode.h
+++ b/arch/powerpc/include/asm/ppc-opcode.h
@@ -92,6 +92,7 @@
 #define OP_31_XOP_TRAP_64   68
 #define OP_31_XOP_DCBF      86
 #define OP_31_XOP_LBZX      87
+#define OP_31_XOP_STDX      149
 #define OP_31_XOP_STWX      151
 #define OP_31_XOP_STBX      215
 #define OP_31_XOP_LBZUX     119
diff --git a/arch/powerpc/kvm/emulate_loadstore.c b/arch/powerpc/kvm/emulate_loadstore.c
index 6d3c0ee1d744..9fdbeb8ea86c 100644
--- a/arch/powerpc/kvm/emulate_loadstore.c
+++ b/arch/powerpc/kvm/emulate_loadstore.c
@@ -82,6 +82,12 @@ int kvmppc_emulate_loadstore(struct kvm_vcpu *vcpu)
 			kvmppc_set_gpr(vcpu, ra, vcpu->arch.vaddr_accessed);
 			break;
 
+		case OP_31_XOP_STDX:
+			emulated = kvmppc_handle_store(run, vcpu,
+						       kvmppc_get_gpr(vcpu, rs),
+							8, 1);
+			break;
+
 		case OP_31_XOP_STWX:
 			emulated = kvmppc_handle_store(run, vcpu,
 						       kvmppc_get_gpr(vcpu, rs),
-- 
2.11.0