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{
    "id": 805815,
    "url": "http://patchwork.ozlabs.org/api/patches/805815/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/kvm-ppc/patch/20170825095212.GB14035@fergus.ozlabs.ibm.com/",
    "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",
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    "msgid": "<20170825095212.GB14035@fergus.ozlabs.ibm.com>",
    "list_archive_url": null,
    "date": "2017-08-25T09:52:12",
    "name": "KVM: PPC: Book3S HV: Fix case where HDEC is treated as 32-bit on POWER9",
    "commit_ref": null,
    "pull_url": null,
    "state": "accepted",
    "archived": false,
    "hash": "b655e138f2c4863336a21d32466ae7751fa5e354",
    "submitter": {
        "id": 67079,
        "url": "http://patchwork.ozlabs.org/api/people/67079/?format=api",
        "name": "Paul Mackerras",
        "email": "paulus@ozlabs.org"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/kvm-ppc/patch/20170825095212.GB14035@fergus.ozlabs.ibm.com/mbox/",
    "series": [],
    "comments": "http://patchwork.ozlabs.org/api/patches/805815/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/805815/checks/",
    "tags": {},
    "related": [],
    "headers": {
        "Return-Path": "<kvm-ppc-owner@vger.kernel.org>",
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        ],
        "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=ozlabs.org; s=201707; \n\tt=1503654822; bh=4yVnPkiF+OaGI2gvyCxpcROUrNDEtHZ5eLWvcE8N7Co=;\n\th=Date:From:To:Subject:From;\n\tb=CFBPsXyFdo+yZDUVprU+AVEjNmuKOswoGv7PiO9AZ5v+kSwm0+9P9fE+sCqJmkens\n\tE9rFt079JBRuo3GXZsYh8Jdffm6Z1zpe7pqhfl5AYlw3bYdP2WIvaZEo7OPGdEh4TC\n\tms200rwevtKtJ3nmKImcvb1Q/oVt+LZE7L18jif9s8Dz2U7LpuV1ZdmO6y2enhoA2w\n\tOjzjljJoj7bSCcu3IqT859+UcboUKfdVuqAiaI1+w5va+h36c//lueLBHBrtXMEM9H\n\tAnvO+PuRaBqJJi0SHIp38GIr1V4clt7jZEF7F24N7neWdGjysNRc8rGDYNpgtgOgWi\n\tZxTwh/Ly7s30g==",
        "Date": "Fri, 25 Aug 2017 19:52:12 +1000",
        "From": "Paul Mackerras <paulus@ozlabs.org>",
        "To": "kvm@vger.kernel.org, kvm-ppc@vger.kernel.org",
        "Subject": "[PATCH] KVM: PPC: Book3S HV: Fix case where HDEC is treated as\n\t32-bit on POWER9",
        "Message-ID": "<20170825095212.GB14035@fergus.ozlabs.ibm.com>",
        "MIME-Version": "1.0",
        "Content-Type": "text/plain; charset=us-ascii",
        "Content-Disposition": "inline",
        "User-Agent": "Mutt/1.5.24 (2015-08-30)",
        "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": "Commit 2f2724630f7a (\"KVM: PPC: Book3S HV: Cope with host using large\ndecrementer mode\", 2017-05-22) added code to treat the hypervisor\ndecrementer (HDEC) as a 64-bit value on POWER9 rather than 32-bit.\nUnfortunately, that commit missed one place where HDEC is treated\nas a 32-bit value.  This fixes it.\n\nThis bug should not have any user-visible consequences that I can\nthink of, beyond an occasional unnecessary exit to the host kernel.\nIf the hypervisor decrementer has gone negative, then the bottom\n32 bits will be negative for about 4 seconds after that, so as\nlong as we get out of the guest within those 4 seconds we won't\nconclude that the HDEC interrupt is spurious.\n\nReported-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>\nFixes: 2f2724630f7a (\"KVM: PPC: Book3S HV: Cope with host using large decrementer mode\")\nSigned-off-by: Paul Mackerras <paulus@ozlabs.org>\n---\n arch/powerpc/kvm/book3s_hv_rmhandlers.S | 3 ++-\n 1 file changed, 2 insertions(+), 1 deletion(-)",
    "diff": "diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S\nindex c52184a..9f1521e 100644\n--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S\n+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S\n@@ -1280,7 +1280,8 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)\n \tcmpwi\tr12,BOOK3S_INTERRUPT_HV_DECREMENTER\n \tbne\t2f\n \tmfspr\tr3,SPRN_HDEC\n-\tcmpwi\tr3,0\n+\tEXTEND_HDEC(r3)\n+\tcmpdi\tr3,0\n \tmr\tr4,r9\n \tbge\tfast_guest_return\n 2:\n",
    "prefixes": []
}