From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:35506 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751156AbdH0Hsc (ORCPT ); Sun, 27 Aug 2017 03:48:32 -0400 Subject: Patch "KVM: s390: sthyi: fix sthyi inline assembly" has been added to the 4.12-stable tree To: heiko.carstens@de.ibm.com, borntraeger@de.ibm.com, cohuck@redhat.com, david@redhat.com, frankja@linux.vnet.ibm.com, gregkh@linuxfoundation.org Cc: , From: Date: Sun, 27 Aug 2017 09:47:57 +0200 Message-ID: <1503820077179209@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: sthyi: fix sthyi inline assembly to the 4.12-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-sthyi-fix-sthyi-inline-assembly.patch and it can be found in the queue-4.12 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 4a4eefcd0e49f9f339933324c1bde431186a0a7d Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Thu, 3 Aug 2017 13:05:11 +0200 Subject: KVM: s390: sthyi: fix sthyi inline assembly From: Heiko Carstens commit 4a4eefcd0e49f9f339933324c1bde431186a0a7d upstream. The sthyi inline assembly misses register r3 within the clobber list. The sthyi instruction will always write a return code to register "R2+1", which in this case would be r3. Due to that we may have register corruption and see host crashes or data corruption depending on how gcc decided to allocate and use registers during compile time. Fixes: 95ca2cb57985 ("KVM: s390: Add sthyi emulation") Reviewed-by: Janosch Frank Signed-off-by: Heiko Carstens Reviewed-by: David Hildenbrand Reviewed-by: Cornelia Huck Signed-off-by: Christian Borntraeger Signed-off-by: Greg Kroah-Hartman --- arch/s390/kvm/sthyi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/s390/kvm/sthyi.c +++ b/arch/s390/kvm/sthyi.c @@ -394,7 +394,7 @@ static int sthyi(u64 vaddr) "srl %[cc],28\n" : [cc] "=d" (cc) : [code] "d" (code), [addr] "a" (addr) - : "memory", "cc"); + : "3", "memory", "cc"); return cc; } Patches currently in stable-queue which might be from heiko.carstens@de.ibm.com are queue-4.12/kvm-s390-sthyi-fix-specification-exception-detection.patch queue-4.12/kvm-s390-sthyi-fix-sthyi-inline-assembly.patch