[Xen-changelog] [qemu-upstream-unstable] s390: fix cpu hotplug / cpu activity on interrupts

[patchbot@xxxxxxx]

commit d194ba1cdbeee54166845b75f9186a8e401e5f07
Author: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Date:   Sun Nov 20 23:12:03 2011 +0000

    s390: fix cpu hotplug / cpu activity on interrupts
    
    The add_del/running_cpu code and env->halted are tracking stopped cpus.
    Sleeping cpus (idle and enabled for interrupts) are waiting inside the
    kernel.
    No interrupt besides the restart can move a cpu from stopped to
    operational. This is already handled over there. So lets just remove
    the bogus wakup from the common interrupt delivery, otherwise any
    interrupt will wake up a cpu, even if this cpu is stopped (Thus leading
    to strange hangs on sigp restart)
    
    This fixes
    echo 0 > /sys/devices/system/cpu/cpu0/online
    echo 1 > /sys/devices/system/cpu/cpu0/online
    in the guest
    
    Signed-off-by: Christian Borntraeger<borntraeger@xxxxxxxxxx>
    Signed-off-by: Alexander Graf <agraf@xxxxxxx>
    (cherry picked from commit 93116ac0cf9734e7b28886aedf03848b37d6785e)
---
 target-s390x/kvm.c |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/target-s390x/kvm.c b/target-s390x/kvm.c
index 40b0ab1..b1404bf 100644
--- a/target-s390x/kvm.c
+++ b/target-s390x/kvm.c
@@ -185,9 +185,6 @@ void kvm_s390_interrupt_internal(CPUState *env, int type, 
uint32_t parm,
         return;
     }
 
-    s390_add_running_cpu(env);
-    qemu_cpu_kick(env);
-
     kvmint.type = type;
     kvmint.parm = parm;
     kvmint.parm64 = parm64;
--
generated by git-patchbot for /home/xen/git/qemu-upstream-unstable.git

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