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([2404:f801:9000:1a:efeb::a31c]) by smtp.gmail.com with ESMTPSA id s21sm2499994pjr.52.2021.04.15.06.09.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 15 Apr 2021 06:10:05 -0700 (PDT) Subject: Re: [Resend RFC PATCH V2 08/12] UIO/Hyper-V: Not load UIO HV driver in the isolation VM. To: Greg KH Cc: kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com, wei.liu@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, arnd@arndb.de, akpm@linux-foundation.org, konrad.wilk@oracle.com, hch@lst.de, m.szyprowski@samsung.com, robin.murphy@arm.com, joro@8bytes.org, will@kernel.org, davem@davemloft.net, kuba@kernel.org, jejb@linux.ibm.com, martin.petersen@oracle.com, Tianyu Lan , iommu@lists.linux-foundation.org, linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-scsi@vger.kernel.org, netdev@vger.kernel.org, vkuznets@redhat.com, thomas.lendacky@amd.com, brijesh.singh@amd.com, sunilmut@microsoft.com References: <20210414144945.3460554-1-ltykernel@gmail.com> <20210414144945.3460554-9-ltykernel@gmail.com> From: Tianyu Lan Message-ID: Date: Thu, 15 Apr 2021 21:09:55 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.9.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Stat-Signature: 6f3jpk1xp8cmkz9xm5xtt5mjrnt58f8u X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: D2508A000398 Received-SPF: none (gmail.com>: No applicable sender policy available) receiver=imf07; identity=mailfrom; envelope-from=""; helo=mail-pj1-f47.google.com; client-ip=209.85.216.47 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1618492206-341754 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 4/14/2021 11:45 PM, Greg KH wrote: > On Wed, Apr 14, 2021 at 10:49:41AM -0400, Tianyu Lan wrote: >> From: Tianyu Lan >> >> UIO HV driver should not load in the isolation VM for security reason. >> Return ENOTSUPP in the hv_uio_probe() in the isolation VM. >> >> Signed-off-by: Tianyu Lan >> --- >> drivers/uio/uio_hv_generic.c | 5 +++++ >> 1 file changed, 5 insertions(+) >> >> diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c >> index 0330ba99730e..678b021d66f8 100644 >> --- a/drivers/uio/uio_hv_generic.c >> +++ b/drivers/uio/uio_hv_generic.c >> @@ -29,6 +29,7 @@ >> #include >> #include >> #include >> +#include >> >> #include "../hv/hyperv_vmbus.h" >> >> @@ -241,6 +242,10 @@ hv_uio_probe(struct hv_device *dev, >> void *ring_buffer; >> int ret; >> >> + /* UIO driver should not be loaded in the isolation VM.*/ >> + if (hv_is_isolation_supported()) >> + return -ENOTSUPP; >> + >> /* Communicating with host has to be via shared memory not hypercall */ >> if (!channel->offermsg.monitor_allocated) { >> dev_err(&dev->device, "vmbus channel requires hypercall\n"); >> -- >> 2.25.1 >> > > Again you send out known-wrong patches? > > :( > Sorry for noise. Will fix this next version and I think we should make sure user space driver to check data from host. This patch will be removed.