From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx49oemnr5i8cqVFmC7kTqmmP8wMOSypUy2rbjkcIa0IkzNGjnrI3uTtFm4w+3OP9V2jbdUw4 ARC-Seal: i=1; a=rsa-sha256; t=1523399872; cv=none; d=google.com; s=arc-20160816; b=dRrejE/BGF/RmceS3cPKOcEW2c9gpEmkhvdCg60jcXKVO42oSSgCNJFyQsMknnci/l QMwu4eD5tg5hV64kuuowY2OYEtvjvKLLH8IlNWq9r8ZmEkDOW5/bMAXBSPNPmQeHX3T+ Btl9z1OUE2DAH46e5Ee1GnoDLw5R7zWUwo6AOptOExXtI1JLSgH3jrCaBItf03eR7Bzw ERFCkj7n9szq2UEddpj5uC20vyKMsvqRMRDICS3kfcCLO0ye1bF6IocpT6iij74daSc/ J5R7vRMBxbYOLr8rFPdN5KjUHAV3amPtdV9O92esqVFw07e0cNMW+I3KiwI17+Gvg+Wz Sn4Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=TBgYUXB/k2aVqzHTeCgE9TO5hW6ZMKyzSK7mpnlvUnA=; b=tOdt4EWrwdWZhpEOpVmVL0wBrxatsZpkclStHKKcXtmneg/uLqqKd5n0W37AfIbO05 kuSm1zjUYHp8jUp3V27IlWxdTyPa/8SQ26LmjEj9iJzwj7EYRvkLZFkVhNYZXigG+ofr lPvNAD725fGBsoRceZA+EzjBtG7N/PzXTGwoOjFhDBqFy/K7PLVWXl1l0Tg1+RdzWWTm qAvbjFDeYoobXJiYRSYvgJMQgqUNB7/QWooE5e2nrh51NDjXIDYHvBY+D9enw/0FSfDw hgGB2s2u8SwTfC4kYfpkcsejRiTrtIWl/Yw6oBYt00jJfmW9SmLFT1bfBnAcK4zVBNy0 3oRA== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Stephen Hemminger , Sasha Levin Subject: [PATCH 4.14 067/138] uio_hv_generic: check that host supports monitor page Date: Wed, 11 Apr 2018 00:24:17 +0200 Message-Id: <20180410212909.891477166@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180410212902.121524696@linuxfoundation.org> References: <20180410212902.121524696@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1597400027759184207?= X-GMAIL-MSGID: =?utf-8?q?1597400545190219006?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ 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 Signed-off-by: Greg Kroah-Hartman --- drivers/uio/uio_hv_generic.c | 7 +++++++ 1 file changed, 7 insertions(+) --- 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; + /* 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 = -ENOTSUPP; + goto fail_close; + } + dev->channel->inbound.ring_buffer->interrupt_mask = 1; set_channel_read_mode(dev->channel, HV_CALL_DIRECT);