From: Alexander Graf <agraf@suse.de>
Date: Wed, 8 Aug 2012 18:44:20 +0000 (+0200)
Subject: KVM: PPC: BookE: Add support for vcpu->mode
X-Git-Tag: next-20120917~33^2~30
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=4950c25b3a240dcacffb2d2a015c958f4ea0fa5a;p=karo-tx-linux.git

KVM: PPC: BookE: Add support for vcpu->mode

Generic KVM code might want to know whether we are inside guest context
or outside. It also wants to be able to push us out of guest context.

Add support to the BookE code for the generic vcpu->mode field that describes
the above states.

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

diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index bcf87fe89179..70a86c0a9d85 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -501,6 +501,15 @@ static int kvmppc_prepare_to_enter(struct kvm_vcpu *vcpu)
 			continue;
 		}
 
+		if (vcpu->mode == EXITING_GUEST_MODE) {
+			r = 1;
+			break;
+		}
+
+		/* Going into guest context! Yay! */
+		vcpu->mode = IN_GUEST_MODE;
+		smp_wmb();
+
 		break;
 	}
 
@@ -572,6 +581,8 @@ int kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
 	kvm_guest_exit();
 
 out:
+	vcpu->mode = OUTSIDE_GUEST_MODE;
+	smp_wmb();
 	local_irq_enable();
 	return ret;
 }