[PATCH 2/6] kvmppc: add hypercall infrastructure - host part

[ehrhardt at linux.vnet.ibm.com]

From: Christian Ehrhardt <ehrhardt at linux.vnet.ibm.com>

This adds the host portion of the hypercall infrastructure which receives
the guest calls - no specific hcall function is implemented in this patch.

Signed-off-by: Christian Ehrhardt <ehrhardt at linux.vnet.ibm.com>
---

[diffstat]
 arch/powerpc/kvm/emulate.c     |   27 +++++++++++++++++++++++++++
 include/asm-powerpc/kvm_para.h |    2 ++
 2 files changed, 29 insertions(+)

[diff]
diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c
--- a/arch/powerpc/kvm/emulate.c
+++ b/arch/powerpc/kvm/emulate.c
@@ -203,6 +203,24 @@
 	kvmppc_set_msr(vcpu, vcpu->arch.srr1);
 }
 
+static int kvmppc_do_hypercall(struct kvm_vcpu *vcpu)
+{
+	int ret = 0;
+
+	switch (vcpu->arch.gpr[0]) {
+	default:
+		printk(KERN_ERR"unknown hypercall %d\n", vcpu->arch.gpr[0]);
+		kvmppc_dump_vcpu(vcpu);
+		ret = -ENOSYS;
+	}
+
+	vcpu->arch.gpr[11] = ret;
+	vcpu->arch.pc += 4; /* Advance past hypercall instruction. */
+
+	return ret;
+}
+
+
 /* XXX to do:
  * lhax
  * lhaux
@@ -232,6 +250,15 @@
 	int advance = 1;
 
 	switch (get_op(inst)) {
+	case 0:
+		if (inst == KVM_HYPERCALL_BIN) {
+			kvmppc_do_hypercall(vcpu);
+			advance = 0; /* kvmppc_do_hypercall handles the PC. */
+		} else {
+			printk(KERN_ERR"unknown op %d\n", get_op(inst));
+			emulated = EMULATE_FAIL;
+		}
+		break;
 	case 3:                                                 /* trap */
 		printk("trap!\n");
 		kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_PROGRAM);
diff --git a/include/asm-powerpc/kvm_para.h b/include/asm-powerpc/kvm_para.h
--- a/include/asm-powerpc/kvm_para.h
+++ b/include/asm-powerpc/kvm_para.h
@@ -22,6 +22,8 @@
 
 #ifdef __KERNEL__
 
+#define KVM_HYPERCALL_BIN 0x03ffffff
+
 static inline int kvm_para_available(void)
 {
 	return 0;