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[3/5] KVM: PPC: Add MMIO emulation for stdx (store doubleword indexed)

Message ID 1490243163-19566-4-git-send-email-paulus@ozlabs.org (mailing list archive)
State Accepted
Delegated to: Paul Mackerras
Headers show

Commit Message

Paul Mackerras March 23, 2017, 4:26 a.m. UTC 
From: Alexey Kardashevskiy <aik@ozlabs.ru>

This adds missing stdx emulation for emulated MMIO accesses by KVM
guests.  This allows the Mellanox mlx5_core driver from recent kernels
to work when MMIO emulation is enforced by userspace.

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

diff --git a/arch/powerpc/include/asm/ppc-opcode.h b/arch/powerpc/include/asm/ppc-opcode.h
index 1e37c3c..94e7df2 100644
--- a/arch/powerpc/include/asm/ppc-opcode.h
+++ b/arch/powerpc/include/asm/ppc-opcode.h
@@ -94,6 +94,7 @@ 
 #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 9cda1b9..a0f27a3 100644
--- a/arch/powerpc/kvm/emulate_loadstore.c
+++ b/arch/powerpc/kvm/emulate_loadstore.c
@@ -119,6 +119,12 @@  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),