[PATCH 14/27] KVM: PPC: Expose magic page support to guest

[Alexander Graf <agraf@suse.de>]

Now that we have the shared page in place and the MMU code knows about
the magic page, we can expose that capability to the guest!

Signed-off-by: Alexander Graf <agraf@suse.de>

---

v2 -> v3:

  - align hypercalls to in/out of ePAPR
---
 arch/powerpc/include/asm/kvm_para.h |    2 ++
 arch/powerpc/kvm/powerpc.c          |   11 +++++++++++
 2 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/include/asm/kvm_para.h b/arch/powerpc/include/asm/kvm_para.h
index 0653b0d..7438ab3 100644
--- a/arch/powerpc/include/asm/kvm_para.h
+++ b/arch/powerpc/include/asm/kvm_para.h
@@ -45,6 +45,8 @@ struct kvm_vcpu_arch_shared {
 #define HC_EV_SUCCESS		0
 #define HC_EV_UNIMPLEMENTED	12
 
+#define KVM_FEATURE_MAGIC_PAGE	1
+
 #ifdef __KERNEL__
 
 #ifdef CONFIG_KVM_GUEST
diff --git a/arch/powerpc/kvm/powerpc.c b/arch/powerpc/kvm/powerpc.c
index a4cf4b4..fecfe04 100644
--- a/arch/powerpc/kvm/powerpc.c
+++ b/arch/powerpc/kvm/powerpc.c
@@ -61,8 +61,19 @@ int kvmppc_kvm_pv(struct kvm_vcpu *vcpu)
 	}
 
 	switch (nr) {
+	case HC_VENDOR_KVM | KVM_HC_PPC_MAP_MAGIC_PAGE:
+	{
+		vcpu->arch.magic_page_pa = param1;
+		vcpu->arch.magic_page_ea = param2;
+
+		r = HC_EV_SUCCESS;
+		break;
+	}
 	case HC_VENDOR_KVM | KVM_HC_FEATURES:
 		r = HC_EV_SUCCESS;
+#if defined(CONFIG_PPC_BOOK3S) /* XXX Missing magic page on BookE */
+		r2 |= (1 << KVM_FEATURE_MAGIC_PAGE);
+#endif
 
 		/* Second return value is in r4 */
 		kvmppc_set_gpr(vcpu, 4, r2);
-- 
1.6.0.2