Christian Borntraeger 586b7ccdb7 KVM: s390: Fix hang VCPU hang/loop regression ... commit 785dbef407 ("KVM: s390: optimize round trip time in request handling") introduced a regression. This regression was seen with CPU hotplug in the guest and switching between 1 or 2 CPUs. This will set/reset the IBS control via synced request. Whenever we make a synced request, we first set the vcpu->requests bit and then block the vcpu. The handler, on the other hand, unblocks itself, processes vcpu->requests (by clearing them) and unblocks itself once again. Now, if the requester sleeps between setting of vcpu->requests and blocking, the handler will clear the vcpu->requests bit and try to unblock itself (although no bit is set). When the requester wakes up, it blocks the VCPU and we have a blocked VCPU without requests. Solution is to always unset the block bit. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Fixes: 785dbef407 ("KVM: s390: optimize round trip time in request handling")		2015-07-30 13:11:13 +02:00
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diag.c	KVM/ARM changes for v4.1:	2015-04-07 18:09:20 +02:00
gaccess.c	KVM: s390: Add MEMOP ioctls for reading/writing guest memory	2015-03-17 16:26:24 +01:00
gaccess.h	KVM: s390: Add MEMOP ioctls for reading/writing guest memory	2015-03-17 16:26:24 +01:00
guestdbg.c	KVM: s390: Use the read_guest_abs() in guest debug functions	2015-03-06 13:41:02 +01:00
intercept.c	KVM: s390: drop handling of interception code 12	2015-05-08 15:51:17 +02:00
interrupt.c	The bulk of the changes here is for x86. And for once it's not	2015-06-24 09:36:49 -07:00
irq.h	KVM: s390: irq routing for adapter interrupts.	2014-03-21 13:43:00 +01:00
Kconfig	rcu: Make SRCU optional by using CONFIG_SRCU	2015-01-06 11:04:29 -08:00
kvm-s390.c	KVM: s390: Fix hang VCPU hang/loop regression	2015-07-30 13:11:13 +02:00
kvm-s390.h	KVM: s390: provide functions for blocking all CPUs	2015-05-08 15:51:15 +02:00
Makefile	KVM: s390: hardware support for guest debugging	2014-04-22 13:24:51 +02:00
priv.c	KVM: s390: Enable guest EDAT2 support	2015-05-08 15:51:14 +02:00
sigp.c	KVM: s390: Guest's memory access functions get access registers	2015-03-17 16:25:04 +01:00
trace-s390.h	tracing: Add TRACE_SYSTEM_VAR to kvm-s390	2015-04-07 12:31:39 -04:00
trace.h	KVM: s390: interpretive execution of SIGP EXTERNAL CALL	2014-05-16 14:57:28 +02:00