linux-kernel - [PATCH 06/44] KVM: ppc: improve trap emulation

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Date:	Tue,  9 Dec 2008 22:22:21 +0200
From:	Avi Kivity <avi@...hat.com>
To:	kvm@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Hollis Blanchard <hollisb@...ibm.com>
Subject: [PATCH 06/44] KVM: ppc: improve trap emulation

From: Hollis Blanchard <hollisb@...ibm.com>

set ESR[PTR] when emulating a guest trap. This allows Linux guests to
properly handle WARN_ON() (i.e. detect that it's a non-fatal trap).

Also remove debugging printk in trap emulation.

Signed-off-by: Hollis Blanchard <hollisb@...ibm.com>
Signed-off-by: Avi Kivity <avi@...hat.com>
---
 arch/powerpc/kvm/emulate.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kvm/emulate.c b/arch/powerpc/kvm/emulate.c
index 814f1e6..4c30fa0 100644
--- a/arch/powerpc/kvm/emulate.c
+++ b/arch/powerpc/kvm/emulate.c
@@ -74,8 +74,8 @@ int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
 	int advance = 1;
 
 	switch (get_op(inst)) {
-	case 3:                                                 /* trap */
-		printk("trap!\n");
+	case 3:                                             /* trap */
+		vcpu->arch.esr |= ESR_PTR;
 		kvmppc_core_queue_program(vcpu);
 		advance = 0;
 		break;
-- 
1.6.0.3

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