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{
    "id": 803006,
    "url": "http://patchwork.ozlabs.org/api/patches/803006/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/kvm-ppc/patch/1503022252.4493.132.camel@kernel.crashing.org/",
    "project": {
        "id": 23,
        "url": "http://patchwork.ozlabs.org/api/projects/23/?format=api",
        "name": "KVM PowerPC development",
        "link_name": "kvm-ppc",
        "list_id": "kvm-ppc.vger.kernel.org",
        "list_email": "kvm-ppc@vger.kernel.org",
        "web_url": null,
        "scm_url": null,
        "webscm_url": null,
        "list_archive_url": "",
        "list_archive_url_format": "",
        "commit_url_format": ""
    },
    "msgid": "<1503022252.4493.132.camel@kernel.crashing.org>",
    "list_archive_url": null,
    "date": "2017-08-18T02:10:52",
    "name": "[1/2] kvm/xive: Workaround P9 DD1.0 bug with IPB bit loss",
    "commit_ref": null,
    "pull_url": null,
    "state": "accepted",
    "archived": false,
    "hash": "941efdd6e2443d65173093d3e7719d8ee63ed762",
    "submitter": {
        "id": 38,
        "url": "http://patchwork.ozlabs.org/api/people/38/?format=api",
        "name": "Benjamin Herrenschmidt",
        "email": "benh@kernel.crashing.org"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/kvm-ppc/patch/1503022252.4493.132.camel@kernel.crashing.org/mbox/",
    "series": [],
    "comments": "http://patchwork.ozlabs.org/api/patches/803006/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/803006/checks/",
    "tags": {},
    "related": [],
    "headers": {
        "Return-Path": "<kvm-ppc-owner@vger.kernel.org>",
        "X-Original-To": "incoming@patchwork.ozlabs.org",
        "Delivered-To": "patchwork-incoming@bilbo.ozlabs.org",
        "Authentication-Results": "ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=vger.kernel.org\n\t(client-ip=209.132.180.67; helo=vger.kernel.org;\n\tenvelope-from=kvm-ppc-owner@vger.kernel.org;\n\treceiver=<UNKNOWN>)",
        "Received": [
            "from vger.kernel.org (vger.kernel.org [209.132.180.67])\n\tby ozlabs.org (Postfix) with ESMTP id 3xYRQc4JvCz9t42\n\tfor <incoming@patchwork.ozlabs.org>;\n\tFri, 18 Aug 2017 12:11:20 +1000 (AEST)",
            "(majordomo@vger.kernel.org) by vger.kernel.org via listexpand\n\tid S1753858AbdHRCLT (ORCPT <rfc822;incoming@patchwork.ozlabs.org>);\n\tThu, 17 Aug 2017 22:11:19 -0400",
            "from gate.crashing.org ([63.228.1.57]:33064 \"EHLO\n\tgate.crashing.org\"\n\trhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP\n\tid S1753857AbdHRCLT (ORCPT <rfc822;kvm-ppc@vger.kernel.org>);\n\tThu, 17 Aug 2017 22:11:19 -0400",
            "from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby gate.crashing.org (8.14.1/8.13.8) with ESMTP id v7I2Aqt1004389;\n\tThu, 17 Aug 2017 21:10:53 -0500"
        ],
        "Message-ID": "<1503022252.4493.132.camel@kernel.crashing.org>",
        "Subject": "[PATCH 1/2] kvm/xive: Workaround P9 DD1.0 bug with IPB bit loss",
        "From": "Benjamin Herrenschmidt <benh@kernel.crashing.org>",
        "To": "kvm-ppc@vger.kernel.org",
        "Cc": "linuxppc dev list <linuxppc-dev@lists.ozlabs.org>,\n\t\"kvm@vger.kernel.org\" <kvm@vger.kernel.org>, paulus@samba.org",
        "Date": "Fri, 18 Aug 2017 12:10:52 +1000",
        "Content-Type": "text/plain; charset=\"UTF-8\"",
        "X-Mailer": "Evolution 3.24.4 (3.24.4-1.fc26) ",
        "Mime-Version": "1.0",
        "Content-Transfer-Encoding": "7bit",
        "Sender": "kvm-ppc-owner@vger.kernel.org",
        "Precedence": "bulk",
        "List-ID": "<kvm-ppc.vger.kernel.org>",
        "X-Mailing-List": "kvm-ppc@vger.kernel.org"
    },
    "content": "Thankfully it only happens when manually manipulating CPPR which\nis rather quite rare.\n\nSigned-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>\n---\n arch/powerpc/kvm/book3s_xive_template.c | 11 ++++++++++-\n 1 file changed, 10 insertions(+), 1 deletion(-)\n\n\n--\nTo unsubscribe from this list: send the line \"unsubscribe kvm-ppc\" in\nthe body of a message to majordomo@vger.kernel.org\nMore majordomo info at  http://vger.kernel.org/majordomo-info.html",
    "diff": "diff --git a/arch/powerpc/kvm/book3s_xive_template.c b/arch/powerpc/kvm/book3s_xive_template.c\nindex 4636ca6e7d38..150be86b1018 100644\n--- a/arch/powerpc/kvm/book3s_xive_template.c\n+++ b/arch/powerpc/kvm/book3s_xive_template.c\n@@ -16,7 +16,16 @@ static void GLUE(X_PFX,ack_pending)(struct kvmppc_xive_vcpu *xc)\n \tu8 cppr;\n \tu16 ack;\n \n-\t/* XXX DD1 bug workaround: Check PIPR vs. CPPR first ! */\n+\t/*\n+\t * DD1 bug workaround: If PIPR is less favored than CPPR\n+\t * ignore the interrupt or we might incorrectly lose an IPB\n+\t * bit.\n+\t */\n+\tif (cpu_has_feature(CPU_FTR_POWER9_DD1)) {\n+\t\tu8 pipr = __x_readb(__x_tima + TM_QW1_OS + TM_PIPR);\n+\t\tif (pipr >= xc->hw_cppr)\n+\t\t\treturn;\n+\t}\n \n \t/* Perform the acknowledge OS to register cycle. */\n \tack = be16_to_cpu(__x_readw(__x_tima + TM_SPC_ACK_OS_REG));\n",
    "prefixes": [
        "1/2"
    ]
}