KVM: PPC: Add KVMPPC_VSX_COPY_WORD_LOAD_DUMP type support for mmio emulation

Some VSX instructions like lxvwsx will splat word into VSR. This patch
adds a new VSX copy type KVMPPC_VSX_COPY_WORD_LOAD_DUMP to support this.

Signed-off-by: Simon Guo <wei.guo.simon@gmail.com>
Reviewed-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 89f44ec..4bade29 100644 (file)
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -453,6 +453,7 @@ struct mmio_hpte_cache {
 #define KVMPPC_VSX_COPY_WORD           1
 #define KVMPPC_VSX_COPY_DWORD          2
 #define KVMPPC_VSX_COPY_DWORD_LOAD_DUMP        3
+#define KVMPPC_VSX_COPY_WORD_LOAD_DUMP 4
 
 struct openpic;
 

diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index bef27b1..45daf3b 100644 (file)
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -907,6 +907,26 @@ static inline void kvmppc_set_vsr_dword_dump(struct kvm_vcpu *vcpu,
        }
 }
 
+static inline void kvmppc_set_vsr_word_dump(struct kvm_vcpu *vcpu,
+       u32 gpr)
+{
+       union kvmppc_one_reg val;
+       int index = vcpu->arch.io_gpr & KVM_MMIO_REG_MASK;
+
+       if (vcpu->arch.mmio_vsx_tx_sx_enabled) {
+               val.vsx32val[0] = gpr;
+               val.vsx32val[1] = gpr;
+               val.vsx32val[2] = gpr;
+               val.vsx32val[3] = gpr;
+               VCPU_VSX_VR(vcpu, index) = val.vval;
+       } else {
+               val.vsx32val[0] = gpr;
+               val.vsx32val[1] = gpr;
+               VCPU_VSX_FPR(vcpu, index, 0) = val.vsxval[0];
+               VCPU_VSX_FPR(vcpu, index, 1) = val.vsxval[0];
+       }
+}
+
 static inline void kvmppc_set_vsr_word(struct kvm_vcpu *vcpu,
        u32 gpr32)
 {
@@ -1061,6 +1081,9 @@ static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
                else if (vcpu->arch.mmio_vsx_copy_type ==
                                KVMPPC_VSX_COPY_DWORD_LOAD_DUMP)
                        kvmppc_set_vsr_dword_dump(vcpu, gpr);
+               else if (vcpu->arch.mmio_vsx_copy_type ==
+                               KVMPPC_VSX_COPY_WORD_LOAD_DUMP)
+                       kvmppc_set_vsr_word_dump(vcpu, gpr);
                break;
 #endif
 #ifdef CONFIG_ALTIVEC