From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx48l61kIYv5W/RDPezA1R2EvmcHWKJ8SJX+B337wVNITmD/aOkagWI52x7fshQT+voPLJ5bb ARC-Seal: i=1; a=rsa-sha256; t=1523399379; cv=none; d=google.com; s=arc-20160816; b=K1aOmSMD2vEbqLXFOizw0+h+imEB84RBKrVzMo7RcEwU2iUOpxQWy+ysjkqhDXQEBA 1/7hctKXmNFtcPRkjbdpZf5tHfzFZs/dQWE66sH18A2oguiDywfp3nX2iICP+vt6ci9i pdbpobZ77NjngaLvyJG6rv2lOeEjUK5JKMatOFId0DW7IQrtm/TDPA7aCAXNMPXX9F2y 260uWDyvWhCfuZsrfjM6+bcUelopO1ec7nZOdgzt2VzDZDnRqeDSK/rJQ3Fnm0ug7bQV PBakkMUCZbrwmpQ5kAPB/Dd9NjW+3y/wENguy2rfH+SmrdU+jv5B1TlWIdcAoO9AZ8HF 6WFw== 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=Yr5J/IWq8IeKXqrdOkLV8bc5jMEzwrw/Rpl1+IMSQ7M=; b=gF7l0oFq5VaTvXZEbJAsukV9M38A1cxSodhcYhLOWeAdQmyiB6hyYn105e2p35W0Oc W2MmjWJTI04/v6IRkbPAsAq2VnAnuIfZLDnBzAgdLiTyZva2w1/lsEtnFvq5bN9RC5Tx 9lPD2QNpcncNqCeQV6ON3t5T+F55bHeLoxUBLQ0h3yDCF0j3kMUg+rbzFkNQY/ksuxh4 FWaHlhFcMj2vuplfvYRP1Q/b8tS2hRZXUXr6zvrmlMtfOI84kiJVXH1osI/7CC+kYOiD E5w51fAWdaxClAX1V/o7X3MzK7DS+5PTLnhuVIBru2z321+mt2JPmcLeCu/c4W+AB8kY Yc9Q== 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 4.15 086/168] uio_hv_generic: check that host supports monitor page Date: Wed, 11 Apr 2018 00:23:48 +0200 Message-Id: <20180410212803.929432437@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180410212800.144079021@linuxfoundation.org> References: <20180410212800.144079021@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?1597400027759184207?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.15-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);