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x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=microsoft.com header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934348AbeCSP6v (ORCPT ); Mon, 19 Mar 2018 11:58:51 -0400 Received: from mail-by2nam03on0103.outbound.protection.outlook.com ([104.47.42.103]:19072 "EHLO NAM03-BY2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S934614AbeCSP4q (ORCPT ); Mon, 19 Mar 2018 11:56:46 -0400 From: Sasha Levin To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" CC: Stephen Hemminger , Stephen Hemminger , Greg Kroah-Hartman , Sasha Levin Subject: [PATCH AUTOSEL for 4.14 75/97] uio_hv_generic: check that host supports monitor page Thread-Topic: [PATCH AUTOSEL for 4.14 75/97] uio_hv_generic: check that host supports monitor page Thread-Index: AQHTv5rMfJzEPTfXZ0yVh2KjEfRdiQ== Date: Mon, 19 Mar 2018 15:56:10 +0000 Message-ID: <20180319155411.12348-75-alexander.levin@microsoft.com> References: <20180319155411.12348-1-alexander.levin@microsoft.com> In-Reply-To: <20180319155411.12348-1-alexander.levin@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [52.168.54.252] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5PR2101MB1031;7:8Q+dlc0ZuO8IVngtKpd8ZhHNuP9q9/F/eHocK1T8haDoGdZ2ShUbULcIymOYGU5YE6N8pm2g7c+N0bho15/38g2JkATtuRnZYOCBXcMFki9gZNN4GiAEhcSxHod0W2u5IcXn8k0SQExDLOEcdh7Vw04P0NVwPJ/7ppimSKtgVJ4Ki7ME6sFC7IuF0ihX9NQFT6WCekWRqC95suJNQ4pqRxMx0awnk+MW08QBvgX7XL5840n9xBPGaeQl2vWUBjFD;20:ONXTlsQJr8oXlOWft6le6d3DWUlvnnVmxbdodzuRv6HMgxv7ur2IcogpMLM43K96jHo42k2BQ90W6LD7Ve2m4bKrzVGiiXgF2ZsI+/4CJH+uvDgBSq/yv8020KrCjIYO7FsFWJHD223834jArTTXludae82hGpKH4JTZCG8ZwRI= x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: a44c9e40-b997-428e-6de1-08d58db1ff7f x-microsoft-antispam: UriScan:;BCL:0;PCL:0;RULEID:(7020095)(4652020)(48565401081)(5600026)(4604075)(3008032)(4534165)(4627221)(201703031133081)(201702281549075)(2017052603328)(7193020);SRVR:DM5PR2101MB1031; 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x-microsoft-antispam-message-info: Tld1Us/d/9ZunF68chvZb7FJP7N2vBNJnCH7JVpLE7eUgW/9Tn8EY3M3dIJ/geLT+uloDwsxpDeHVJ3TzYeGxmU1PIoal8uymxUquxoTHL0x7SPijbLCV95CKwd66DJaE2yhnoNUi2Rb+f2TfQSUI81BHikehsbZeilOzPYH52W1DorqUZ0ClsIcNw4eYe+AmBmw87EMsIhLWxW8HcBh9YSb/H+lT6GkuiYkpFVw8ljQ6PeU5MzoMQSsTUyPWsesGouIzDqVYwOn4AHtkxg8Gi7m8Jj/QLM4kcs6R/yjleL/S+LIHZb/qu/Diir2YxCAB454Wyh6gOOUFnEfJH1jDw== spamdiagnosticoutput: 1:99 spamdiagnosticmetadata: NSPM Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: a44c9e40-b997-428e-6de1-08d58db1ff7f X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Mar 2018 15:56:10.6952 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR2101MB1031 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Stephen Hemminger [ Upstream commit 06028d15177a1b406b7b075ea47c6a352732f23a ] In order for userspace application to signal host, it needs the host to support the monitor page property. Check for the flag and fail if this is not supported. Signed-off-by: Stephen Hemminger Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/uio/uio_hv_generic.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c index 48d5327d38d4..fe5cdda80b2c 100644 --- a/drivers/uio/uio_hv_generic.c +++ b/drivers/uio/uio_hv_generic.c @@ -124,6 +124,13 @@ hv_uio_probe(struct hv_device *dev, if (ret) goto fail; =20 + /* Communicating with host has to be via shared memory not hypercall */ + if (!dev->channel->offermsg.monitor_allocated) { + dev_err(&dev->device, "vmbus channel requires hypercall\n"); + ret =3D -ENOTSUPP; + goto fail_close; + } + dev->channel->inbound.ring_buffer->interrupt_mask =3D 1; set_channel_read_mode(dev->channel, HV_CALL_DIRECT); =20 --=20 2.14.1