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{
    "id": 800942,
    "url": "http://patchwork.ozlabs.org/api/patches/800942/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/kvm-ppc/patch/20170813013346.14002-1-npiggin@gmail.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": "<20170813013346.14002-1-npiggin@gmail.com>",
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    "date": "2017-08-13T01:33:38",
    "name": "[v2,1/9] KVM: PPC: Book3S HV: Fix H_REGISTER_VPA VPA size validation",
    "commit_ref": null,
    "pull_url": null,
    "state": "accepted",
    "archived": false,
    "hash": "2b21e4884f9c0a24a0ceb91a99936ec796e070a0",
    "submitter": {
        "id": 69518,
        "url": "http://patchwork.ozlabs.org/api/people/69518/?format=api",
        "name": "Nicholas Piggin",
        "email": "npiggin@gmail.com"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/kvm-ppc/patch/20170813013346.14002-1-npiggin@gmail.com/mbox/",
    "series": [],
    "comments": "http://patchwork.ozlabs.org/api/patches/800942/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/800942/checks/",
    "tags": {},
    "related": [],
    "headers": {
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        "X-Received": "by 10.99.101.132 with SMTP id z126mr19624373pgb.64.1502588052558;\n\tSat, 12 Aug 2017 18:34:12 -0700 (PDT)",
        "From": "Nicholas Piggin <npiggin@gmail.com>",
        "To": "linuxppc-dev@lists.ozlabs.org",
        "Cc": "Nicholas Piggin <npiggin@gmail.com>, kvm-ppc@vger.kernel.org",
        "Subject": "[PATCH v2 1/9] KVM: PPC: Book3S HV: Fix H_REGISTER_VPA VPA size\n\tvalidation",
        "Date": "Sun, 13 Aug 2017 11:33:38 +1000",
        "Message-Id": "<20170813013346.14002-1-npiggin@gmail.com>",
        "X-Mailer": "git-send-email 2.13.3",
        "In-Reply-To": "<20170812113416.15978-1-npiggin@gmail.com>",
        "References": "<20170812113416.15978-1-npiggin@gmail.com>",
        "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": "KVM currently validates the size of the VPA registered by the client\nagainst sizeof(struct lppaca), however we align (and therefore size)\nthat struct to 1kB to avoid crossing a 4kB boundary in the client.\n\nPAPR calls for sizes >= 640 bytes to be accepted. Hard code this with\na comment.\n\nSigned-off-by: Nicholas Piggin <npiggin@gmail.com>\n---\n arch/powerpc/kvm/book3s_hv.c | 8 +++++++-\n 1 file changed, 7 insertions(+), 1 deletion(-)",
    "diff": "diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c\nindex 359c79cdf0cc..1182cfd79857 100644\n--- a/arch/powerpc/kvm/book3s_hv.c\n+++ b/arch/powerpc/kvm/book3s_hv.c\n@@ -485,7 +485,13 @@ static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,\n \n \tswitch (subfunc) {\n \tcase H_VPA_REG_VPA:\t\t/* register VPA */\n-\t\tif (len < sizeof(struct lppaca))\n+\t\t/*\n+\t\t * The size of our lppaca is 1kB because of the way we align\n+\t\t * it for the guest to avoid crossing a 4kB boundary. We only\n+\t\t * use 640 bytes of the structure though, so we should accept\n+\t\t * clients that set a size of 640.\n+\t\t */\n+\t\tif (len < 640)\n \t\t\tbreak;\n \t\tvpap = &tvcpu->arch.vpa;\n \t\terr = 0;\n",
    "prefixes": [
        "v2",
        "1/9"
    ]
}