This is a note to let you know that I've just added the patch titled
KVM: PPC: Book3S HV: Fix KVM hang with CONFIG_KVM_XICS=n
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-ppc-book3s-hv-fix-kvm-hang-with-config_kvm_xics-n.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7505258c5fcb0a1cc3c76a47b4cf9506d21d10e6 Mon Sep 17 00:00:00 2001
From: Anton Blanchard <anton@xxxxxxxxx>
Date: Tue, 25 Mar 2014 10:47:01 +1100
Subject: KVM: PPC: Book3S HV: Fix KVM hang with CONFIG_KVM_XICS=n
From: Anton Blanchard <anton@xxxxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Paul Mackerras <paulus@xxxxxxxxx>
Acked-by: Scott Wood <scottwood@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/kvm/book3s_hv.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -86,7 +86,7 @@ static void kvmppc_fast_vcpu_kick_hv(str
/* 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);
@@ -1360,9 +1360,7 @@ static void kvmppc_start_thread(struct k
smp_wmb();
#if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP)
if (cpu != smp_processor_id()) {
-#ifdef CONFIG_KVM_XICS
xics_wake_cpu(cpu);
-#endif
if (vcpu->arch.ptid)
++vc->n_woken;
}
Patches currently in stable-queue which might be from anton@xxxxxxxxx are
queue-3.14/kvm-ppc-book3s-hv-fix-kvm-hang-with-config_kvm_xics-n.patch
queue-3.14/powerpc-compat-32-bit-little-endian-machine-name-is-ppcle-not-ppc.patch
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