linux-kernel - Re: [PATCH 2/5] vfio: introduce the VFIO_DMA_MAP_FLAG

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Date:	Tue, 21 Oct 2014 14:17:48 +0200
From:	Antonios Motakis <a.motakis@...tualopensystems.com>
To:	Alex Williamson <alex.williamson@...hat.com>
Cc:	kvm-arm <kvmarm@...ts.cs.columbia.edu>,
	Linux IOMMU <iommu@...ts.linux-foundation.org>,
	Will Deacon <will.deacon@....com>,
	VirtualOpenSystems Technical Team <tech@...tualopensystems.com>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Eric Auger <eric.auger@...aro.org>,
	Kim Phillips <kim.phillips@...escale.com>,
	Marc Zyngier <marc.zyngier@....com>,
	"open list:VFIO DRIVER" <kvm@...r.kernel.org>,
	"open list:ABI/API" <linux-api@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/5] vfio: introduce the VFIO_DMA_MAP_FLAG_NOEXEC flag

On Mon, Oct 20, 2014 at 11:29 PM, Alex Williamson
<alex.williamson@...hat.com> wrote:
> On Mon, 2014-10-13 at 15:09 +0200, Antonios Motakis wrote:
>> We introduce the VFIO_DMA_MAP_FLAG_NOEXEC flag to the VFIO dma map call,
>> and expose its availability via the capability VFIO_DMA_NOEXEC_IOMMU.
>> This way the user can control whether the XN flag will be set on the
>> requested mappings. The IOMMU_NOEXEC flag needs to be available for all
>> the IOMMUs of the container used.
>>
>> Signed-off-by: Antonios Motakis <a.motakis@...tualopensystems.com>
>> ---
>>  include/uapi/linux/vfio.h | 2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
>> index 6612974..111b5e8 100644
>> --- a/include/uapi/linux/vfio.h
>> +++ b/include/uapi/linux/vfio.h
>> @@ -29,6 +29,7 @@
>>   * capability is subject to change as groups are added or removed.
>>   */
>>  #define VFIO_DMA_CC_IOMMU            4
>> +#define VFIO_DMA_NOEXEC_IOMMU                5
>>
>>  /* Check if EEH is supported */
>>  #define VFIO_EEH                     5
>                                     ^^
> 5 is still already used.  Feel free to convert to enum so we stop making
> this mistake.

Oops :) will do.

>
>> @@ -401,6 +402,7 @@ struct vfio_iommu_type1_dma_map {
>>       __u32   flags;
>>  #define VFIO_DMA_MAP_FLAG_READ (1 << 0)              /* readable from device */
>>  #define VFIO_DMA_MAP_FLAG_WRITE (1 << 1)     /* writable from device */
>> +#define VFIO_DMA_MAP_FLAG_NOEXEC (1 << 2)    /* not executable from device */
>>       __u64   vaddr;                          /* Process virtual address */
>>       __u64   iova;                           /* IO virtual address */
>>       __u64   size;                           /* Size of mapping (bytes) */
>
>
>



-- 
Antonios Motakis
Virtual Open Systems
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