Re: [Resend RFC PATCH V2 08/12] UIO/Hyper-V: Not load UIO HV driver in the isolation VM.

From: Tianyu Lan <ltykernel@gmail.com>
To: Greg KH <gregkh@linuxfoundation.org>
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 <Tianyu.Lan@microsoft.com>,
	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
Subject: Re: [Resend RFC PATCH V2 08/12] UIO/Hyper-V: Not load UIO HV driver in the isolation VM.
Date: Thu, 15 Apr 2021 21:09:55 +0800	[thread overview]
Message-ID: <eec53f89-4a18-39ce-aff8-c07be2ce3971@gmail.com> (raw)
In-Reply-To: <YHcOL+HlEoh5jPb8@kroah.com>


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 <Tianyu.Lan@microsoft.com>
>>
>> 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 <Tianyu.Lan@microsoft.com>
>> ---
>>   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 <linux/hyperv.h>
>>   #include <linux/vmalloc.h>
>>   #include <linux/slab.h>
>> +#include <asm/mshyperv.h>
>>   
>>   #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.