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GET /api/patches/810102/?format=api
{ "id": 810102, "url": "http://patchwork.ozlabs.org/api/patches/810102/?format=api", "web_url": "http://patchwork.ozlabs.org/project/ubuntu-kernel/patch/20170904233905.20352-2-dja@axtens.net/", "project": { "id": 15, "url": "http://patchwork.ozlabs.org/api/projects/15/?format=api", "name": "Ubuntu Kernel", "link_name": "ubuntu-kernel", "list_id": "kernel-team.lists.ubuntu.com", "list_email": "kernel-team@lists.ubuntu.com", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20170904233905.20352-2-dja@axtens.net>", "list_archive_url": null, "date": "2017-09-04T23:39:05", "name": "[SRU,Xenial,1/1] KVM: PPC: Book3S HV: Enable TM before accessing TM registers", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "ed0a14d4427851dc71887bae118b7f7045205dab", "submitter": { "id": 65792, "url": "http://patchwork.ozlabs.org/api/people/65792/?format=api", "name": "Daniel Axtens", "email": "dja@axtens.net" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/ubuntu-kernel/patch/20170904233905.20352-2-dja@axtens.net/mbox/", "series": [ { "id": 1571, "url": "http://patchwork.ozlabs.org/api/series/1571/?format=api", "web_url": "http://patchwork.ozlabs.org/project/ubuntu-kernel/list/?series=1571", "date": "2017-09-04T23:39:05", "name": "Fixes for LP#1714859", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/1571/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/810102/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/810102/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<kernel-team-bounces@lists.ubuntu.com>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@bilbo.ozlabs.org", "Authentication-Results": [ "ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=lists.ubuntu.com\n\t(client-ip=91.189.94.19; helo=huckleberry.canonical.com;\n\tenvelope-from=kernel-team-bounces@lists.ubuntu.com;\n\treceiver=<UNKNOWN>)", "ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n\tunprotected) header.d=axtens.net header.i=@axtens.net\n\theader.b=\"hA2ZYmgl\"; dkim-atps=neutral" ], "Received": [ "from huckleberry.canonical.com (huckleberry.canonical.com\n\t[91.189.94.19])\n\tby ozlabs.org (Postfix) with ESMTP id 3xmmJ91vG4z9t24;\n\tTue, 5 Sep 2017 22:30:01 +1000 (AEST)", "from localhost ([127.0.0.1] helo=huckleberry.canonical.com)\n\tby huckleberry.canonical.com with esmtp (Exim 4.86_2)\n\t(envelope-from <kernel-team-bounces@lists.ubuntu.com>)\n\tid 1dpCzO-0004fm-5g; Tue, 05 Sep 2017 12:29:58 +0000", "from mail-pg0-f66.google.com ([74.125.83.66])\n\tby huckleberry.canonical.com with esmtps\n\t(TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.86_2)\n\t(envelope-from <dja@axtens.net>) id 1dp0xj-0008FD-6U\n\tfor kernel-team@lists.canonical.com; Mon, 04 Sep 2017 23:39:27 +0000", "by mail-pg0-f66.google.com with SMTP id j6so949530pgc.4\n\tfor <kernel-team@lists.canonical.com>;\n\tMon, 04 Sep 2017 16:39:27 -0700 (PDT)", "from localhost.localdomain (124-171-202-56.dyn.iinet.net.au.\n\t[124.171.202.56]) by smtp.gmail.com with ESMTPSA id\n\tq67sm13069375pfg.37.2017.09.04.16.39.23\n\t(version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);\n\tMon, 04 Sep 2017 16:39:25 -0700 (PDT)" ], "DKIM-Signature": "v=1; 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\n\tMon, 04 Sep 2017 16:39:25 -0700 (PDT)", "From": "Daniel Axtens <dja@axtens.net>", "To": "kernel-team@lists.canonical.com", "Subject": "[SRU][Xenial][PATCH 1/1] KVM: PPC: Book3S HV: Enable TM before\n\taccessing TM registers", "Date": "Tue, 5 Sep 2017 09:39:05 +1000", "Message-Id": "<20170904233905.20352-2-dja@axtens.net>", "X-Mailer": "git-send-email 2.11.0", "In-Reply-To": "<20170904233905.20352-1-dja@axtens.net>", "References": "<20170904233905.20352-1-dja@axtens.net>", "X-Mailman-Approved-At": "Tue, 05 Sep 2017 12:29:56 +0000", "X-BeenThere": "kernel-team@lists.ubuntu.com", "X-Mailman-Version": "2.1.20", "Precedence": "list", "List-Id": "Kernel team discussions <kernel-team.lists.ubuntu.com>", "List-Unsubscribe": "<https://lists.ubuntu.com/mailman/options/kernel-team>,\n\t<mailto:kernel-team-request@lists.ubuntu.com?subject=unsubscribe>", "List-Archive": "<https://lists.ubuntu.com/archives/kernel-team>", "List-Post": "<mailto:kernel-team@lists.ubuntu.com>", "List-Help": "<mailto:kernel-team-request@lists.ubuntu.com?subject=help>", "List-Subscribe": "<https://lists.ubuntu.com/mailman/listinfo/kernel-team>,\n\t<mailto:kernel-team-request@lists.ubuntu.com?subject=subscribe>", "Cc": "danielgb@au1.ibm.com", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=\"utf-8\"", "Content-Transfer-Encoding": "base64", "Errors-To": "kernel-team-bounces@lists.ubuntu.com", "Sender": "\"kernel-team\" <kernel-team-bounces@lists.ubuntu.com>" }, "content": "From: Paul Mackerras <paulus@ozlabs.org>\n\nBugLink: https://bugs.launchpad.net/bugs/1714420\n\nCommit 46a704f8409f (\"KVM: PPC: Book3S HV: Preserve userspace HTM state\nproperly\", 2017-06-15) added code to read transactional memory (TM)\nregisters but forgot to enable TM before doing so. The result is\nthat if userspace does have live values in the TM registers, a KVM_RUN\nioctl will cause a host kernel crash like this:\n\n[ 181.328511] Unrecoverable TM Unavailable Exception f60 at d00000001e7d9980\n[ 181.328605] Oops: Unrecoverable TM Unavailable Exception, sig: 6 [#1]\n[ 181.328613] SMP NR_CPUS=2048\n[ 181.328613] NUMA\n[ 181.328618] PowerNV\n[ 181.328646] Modules linked in: vhost_net vhost tap nfs_layout_nfsv41_files rpcsec_gss_krb5 nfsv4 dns_resolver nfs\n+fscache xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat\n+nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 tun ebtable_filter ebtables\n+ip6table_filter ip6_tables iptable_filter bridge stp llc kvm_hv kvm nfsd ses enclosure scsi_transport_sas ghash_generic\n+auth_rpcgss gf128mul xts sg ctr nfs_acl lockd vmx_crypto shpchp ipmi_powernv i2c_opal grace ipmi_devintf i2c_core\n+powernv_rng sunrpc ipmi_msghandler ibmpowernv uio_pdrv_genirq uio leds_powernv powernv_op_panel ip_tables xfs sd_mod\n+lpfc ipr bnx2x libata mdio ptp pps_core scsi_transport_fc libcrc32c dm_mirror dm_region_hash dm_log dm_mod\n[ 181.329278] CPU: 40 PID: 9926 Comm: CPU 0/KVM Not tainted 4.12.0+ #1\n[ 181.329337] task: c000003fc6980000 task.stack: c000003fe4d80000\n[ 181.329396] NIP: d00000001e7d9980 LR: d00000001e77381c CTR: d00000001e7d98f0\n[ 181.329465] REGS: c000003fe4d837e0 TRAP: 0f60 Not tainted (4.12.0+)\n[ 181.329523] MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE>\n[ 181.329527] CR: 24022448 XER: 00000000\n[ 181.329608] CFAR: d00000001e773818 SOFTE: 1\n[ 181.329608] GPR00: d00000001e77381c c000003fe4d83a60 d00000001e7ef410 c000003fdcfe0000\n[ 181.329608] GPR04: c000003fe4f00000 0000000000000000 0000000000000000 c000003fd7954800\n[ 181.329608] GPR08: 0000000000000001 c000003fc6980000 0000000000000000 d00000001e7e2880\n[ 181.329608] GPR12: d00000001e7d98f0 c000000007b19000 00000001295220e0 00007fffc0ce2090\n[ 181.329608] GPR16: 0000010011886608 00007fff8c89f260 0000000000000001 00007fff8c080028\n[ 181.329608] GPR20: 0000000000000000 00000100118500a6 0000010011850000 0000010011850000\n[ 181.329608] GPR24: 00007fffc0ce1b48 0000010011850000 00000000d673b901 0000000000000000\n[ 181.329608] GPR28: 0000000000000000 c000003fdcfe0000 c000003fdcfe0000 c000003fe4f00000\n[ 181.330199] NIP [d00000001e7d9980] kvmppc_vcpu_run_hv+0x90/0x6b0 [kvm_hv]\n[ 181.330264] LR [d00000001e77381c] kvmppc_vcpu_run+0x2c/0x40 [kvm]\n[ 181.330322] Call Trace:\n[ 181.330351] [c000003fe4d83a60] [d00000001e773478] kvmppc_set_one_reg+0x48/0x340 [kvm] (unreliable)\n[ 181.330437] [c000003fe4d83b30] [d00000001e77381c] kvmppc_vcpu_run+0x2c/0x40 [kvm]\n[ 181.330513] [c000003fe4d83b50] [d00000001e7700b4] kvm_arch_vcpu_ioctl_run+0x114/0x2a0 [kvm]\n[ 181.330586] [c000003fe4d83bd0] [d00000001e7642f8] kvm_vcpu_ioctl+0x598/0x7a0 [kvm]\n[ 181.330658] [c000003fe4d83d40] [c0000000003451b8] do_vfs_ioctl+0xc8/0x8b0\n[ 181.330717] [c000003fe4d83de0] [c000000000345a64] SyS_ioctl+0xc4/0x120\n[ 181.330776] [c000003fe4d83e30] [c00000000000b004] system_call+0x58/0x6c\n[ 181.330833] Instruction dump:\n[ 181.330869] e92d0260 e9290b50 e9290108 792807e3 41820058 e92d0260 e9290b50 e9290108\n[ 181.330941] 792ae8a4 794a1f87 408204f4 e92d0260 <7d4022a6> f9490ff0 e92d0260 7d4122a6\n[ 181.331013] ---[ end trace 6f6ddeb4bfe92a92 ]---\n\nThe fix is just to turn on the TM bit in the MSR before accessing the\nregisters.\n\nCc: stable@vger.kernel.org # v3.14+\nFixes: 46a704f8409f (\"KVM: PPC: Book3S HV: Preserve userspace HTM state properly\")\nReported-by: Jan Stancek <jstancek@redhat.com>\nTested-by: Jan Stancek <jstancek@redhat.com>\nSigned-off-by: Paul Mackerras <paulus@ozlabs.org>\n(cherry picked from commit e47057151422a67ce08747176fa21cb3b526a2c9)\nSigned-off-by: Daniel Axtens <dja@axtens.net>\n---\n arch/powerpc/kvm/book3s_hv.c | 2 ++\n 1 file changed, 2 insertions(+)", "diff": "diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c\nindex 0283de0fe7d0..36e841e10db1 100644\n--- a/arch/powerpc/kvm/book3s_hv.c\n+++ b/arch/powerpc/kvm/book3s_hv.c\n@@ -2708,6 +2708,8 @@ static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu)\n \t\t\trun->fail_entry.hardware_entry_failure_reason = 0;\n \t\t\treturn -EINVAL;\n \t\t}\n+\t\t/* Enable TM so we can read the TM SPRs */\n+\t\tmtmsr(mfmsr() | MSR_TM);\n \t\tcurrent->thread.tm_tfhar = mfspr(SPRN_TFHAR);\n \t\tcurrent->thread.tm_tfiar = mfspr(SPRN_TFIAR);\n \t\tcurrent->thread.tm_texasr = mfspr(SPRN_TEXASR);\n", "prefixes": [ "SRU", "Xenial", "1/1" ] }