KVM: PPC: Teach MMIO Signedness
The guest I was trying to get to run uses the LHA and LHAU instructions.
Those instructions basically do a load, but also sign extend the result.
Since we need to fill our registers by hand when doing MMIO, we also need
to sign extend manually.
This patch implements sign extended MMIO and the LHA(U) instructions.
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c
index cb72a65..11789dd 100644
--- a/arch/powerpc/kvm/emulate.c
+++ b/arch/powerpc/kvm/emulate.c
@@ -62,6 +62,8 @@
#define OP_STBU 39
#define OP_LHZ 40
#define OP_LHZU 41
+#define OP_LHA 42
+#define OP_LHAU 43
#define OP_STH 44
#define OP_STHU 45
@@ -450,6 +452,18 @@
kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
break;
+ case OP_LHA:
+ rt = get_rt(inst);
+ emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
+ break;
+
+ case OP_LHAU:
+ ra = get_ra(inst);
+ rt = get_rt(inst);
+ emulated = kvmppc_handle_loads(run, vcpu, rt, 2, 1);
+ kvmppc_set_gpr(vcpu, ra, vcpu->arch.paddr_accessed);
+ break;
+
case OP_STH:
rs = get_rs(inst);
emulated = kvmppc_handle_store(run, vcpu,