From: Christian Borntraeger <borntraeger@de.ibm.com>
To: Avi Kivity <avi@redhat.com>, Marcelo Tossati <mtosatti@redhat.com>
Cc: Alexander Graf <agraf@suse.de>,
Jens Freimann <jfrei@linux.vnet.ibm.com>,
Cornelia Huck <cornelia.huck@de.ibm.com>,
Heiko Carstens <heiko.carstens@de.ibm.com>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Heinz Graalfs <graalfs@linux.vnet.ibm.com>,
KVM <kvm@vger.kernel.org>,
Christian Borntraeger <borntraeger@de.ibm.com>,
stable@vger.kernel.org
Subject: [PATCH 3/3] s390/kvm: dont announce RRBM support
Date: Tue, 2 Oct 2012 16:25:38 +0200 [thread overview]
Message-ID: <1349187938-39712-4-git-send-email-borntraeger@de.ibm.com> (raw)
In-Reply-To: <1349187938-39712-1-git-send-email-borntraeger@de.ibm.com>
Newer kernels (linux-next with the transparent huge page patches)
use rrbm if the feature is announced via feature bit 66.
RRBM will cause intercepts, so KVM does not handle it right now,
causing an illegal instruction in the guest.
The easy solution is to disable the feature bit for the guest.
This fixes bugs like:
Kernel BUG at 0000000000124c2a [verbose debug info unavailable]
illegal operation: 0001 [#1] SMP
Modules linked in: virtio_balloon virtio_net ipv6 autofs4
CPU: 0 Not tainted 3.5.4 #1
Process fmempig (pid: 659, task: 000000007b712fd0, ksp: 000000007bed3670)
Krnl PSW : 0704d00180000000 0000000000124c2a (pmdp_clear_flush_young+0x5e/0x80)
R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:1 PM:0 EA:3
00000000003cc000 0000000000000004 0000000000000000 0000000079800000
0000000000040000 0000000000000000 000000007bed3918 000000007cf40000
0000000000000001 000003fff7f00000 000003d281a94000 000000007bed383c
000000007bed3918 00000000005ecbf8 00000000002314a6 000000007bed36e0
Krnl Code:>0000000000124c2a: b9810025 ogr %r2,%r5
0000000000124c2e: 41343000 la %r3,0(%r4,%r3)
0000000000124c32: a716fffa brct %r1,124c26
0000000000124c36: b9010022 lngr %r2,%r2
0000000000124c3a: e3d0f0800004 lg %r13,128(%r15)
0000000000124c40: eb22003f000c srlg %r2,%r2,63
[ 2150.713198] Call Trace:
[ 2150.713223] ([<00000000002312c4>] page_referenced_one+0x6c/0x27c)
[ 2150.713749] [<0000000000233812>] page_referenced+0x32a/0x410
[...]
CC: stable@vger.kernel.org
CC: Alex Graf <agraf@suse.de>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
---
arch/s390/kvm/kvm-s390.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index ecced9d..38883f0 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -997,7 +997,7 @@ static int __init kvm_s390_init(void)
}
memcpy(facilities, S390_lowcore.stfle_fac_list, 16);
facilities[0] &= 0xff00fff3f47c0000ULL;
- facilities[1] &= 0x201c000000000000ULL;
+ facilities[1] &= 0x001c000000000000ULL;
return 0;
}
--
1.7.11.7
prev parent reply other threads:[~2012-10-02 14:25 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-02 14:25 [PATCH 0/3] s390/kvm: misc fixes Christian Borntraeger
2012-10-02 14:25 ` [PATCH 1/3] s390/kvm: Interrupt injection bugfix Christian Borntraeger
2012-10-02 14:25 ` [PATCH 2/3] s390/kvm: Add documentation for KVM_S390_INTERRUPT Christian Borntraeger
2012-10-10 16:27 ` Marcelo Tosatti
2012-10-10 16:32 ` Alexander Graf
2012-10-10 16:38 ` Cornelia Huck
2012-10-10 16:37 ` Cornelia Huck
2012-10-10 18:43 ` Marcelo Tosatti
2012-10-10 18:57 ` Marcelo Tosatti
2012-10-02 14:25 ` Christian Borntraeger [this message]
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