From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:42397 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933053AbbGHHYX (ORCPT ); Wed, 8 Jul 2015 03:24:23 -0400 Subject: Patch "KVM: s390: fix external call injection without sigp interpretation" has been added to the 4.1-stable tree To: dahi@linux.vnet.ibm.com, borntraeger@de.ibm.com, gregkh@linuxfoundation.org, jfrei@linux.vnet.ibm.com Cc: , From: Date: Wed, 08 Jul 2015 00:24:17 -0700 Message-ID: <143634025740129@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled KVM: s390: fix external call injection without sigp interpretation to the 4.1-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-s390-fix-external-call-injection-without-sigp-interpretation.patch and it can be found in the queue-4.1 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From b938eacea0b6881f2116a061e6da3ec840e75137 Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Thu, 30 Apr 2015 13:33:59 +0200 Subject: KVM: s390: fix external call injection without sigp interpretation From: David Hildenbrand commit b938eacea0b6881f2116a061e6da3ec840e75137 upstream. Commit ea5f49692575 ("KVM: s390: only one external call may be pending at a time") introduced a bug on machines that don't have SIGP interpretation facility installed. The injection of an external call will now always fail with -EBUSY (if none is already pending). This leads to the following symptoms: - An external call will be injected but with the wrong "src cpu id", as this id will not be remembered. - The target vcpu will not be woken up, therefore the guest will hang if it cannot deal with unexpected failures of the SIGP EXTERNAL CALL instruction. - If an external call is already pending, -EBUSY will not be reported. Reviewed-by: Christian Borntraeger Reviewed-by: Jens Freimann Signed-off-by: David Hildenbrand Signed-off-by: Christian Borntraeger Signed-off-by: Greg Kroah-Hartman --- arch/s390/kvm/interrupt.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -1061,7 +1061,7 @@ static int __inject_extcall(struct kvm_v if (sclp_has_sigpif()) return __inject_extcall_sigpif(vcpu, src_id); - if (!test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs)) + if (test_and_set_bit(IRQ_PEND_EXT_EXTERNAL, &li->pending_irqs)) return -EBUSY; *extcall = irq->u.extcall; atomic_set_mask(CPUSTAT_EXT_INT, li->cpuflags); Patches currently in stable-queue which might be from dahi@linux.vnet.ibm.com are queue-4.1/kvm-s390-fix-external-call-injection-without-sigp-interpretation.patch