linux-kernel - [PATCH 3.13 091/151] KVM: PPC: Book3S HV: Fix KVM hang with CONFIG_KVM

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Message-Id: <1399045139-4531-92-git-send-email-kamal@canonical.com>
Date:	Fri,  2 May 2014 08:37:59 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Anton Blanchard <anton@...ba.org>,
	Paul Mackerras <paulus@...ba.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 091/151] KVM: PPC: Book3S HV: Fix KVM hang with CONFIG_KVM_XICS=n

3.13.11.1 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Anton Blanchard <anton@...ba.org>

commit 7505258c5fcb0a1cc3c76a47b4cf9506d21d10e6 upstream.

I noticed KVM is broken when KVM in-kernel XICS emulation
(CONFIG_KVM_XICS) is disabled.

The problem was introduced in 48eaef05 (KVM: PPC: Book3S HV: use
xics_wake_cpu only when defined). It used CONFIG_KVM_XICS to wrap
xics_wake_cpu, where CONFIG_PPC_ICP_NATIVE should have been
used.

Signed-off-by: Anton Blanchard <anton@...ba.org>
Signed-off-by: Paul Mackerras <paulus@...ba.org>
Acked-by: Scott Wood <scottwood@...escale.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 arch/powerpc/kvm/book3s_hv.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index edeac10..992b089 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -85,7 +85,7 @@ static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
 
 	/* CPU points to the first thread of the core */
 	if (cpu != me && cpu >= 0 && cpu < nr_cpu_ids) {
-#ifdef CONFIG_KVM_XICS
+#ifdef CONFIG_PPC_ICP_NATIVE
 		int real_cpu = cpu + vcpu->arch.ptid;
 		if (paca[real_cpu].kvm_hstate.xics_phys)
 			xics_wake_cpu(real_cpu);
@@ -1192,9 +1192,7 @@ static void kvmppc_start_thread(struct kvm_vcpu *vcpu)
 	smp_wmb();
 #if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP)
 	if (vcpu->arch.ptid) {
-#ifdef CONFIG_KVM_XICS
 		xics_wake_cpu(cpu);
-#endif
 		++vc->n_woken;
 	}
 #endif
-- 
1.9.1

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