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From: Auger Eric <eric.auger@redhat.com>
To: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>,
	Jacob Pan <jacob.jun.pan@linux.intel.com>,
	"iommu@lists.linux-foundation.org"
	<iommu@lists.linux-foundation.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Joerg Roedel <joro@8bytes.org>,
	David Woodhouse <dwmw2@infradead.org>,
	Alex Williamson <alex.williamson@redhat.com>
Cc: Yi Liu <yi.l.liu@intel.com>, "Tian, Kevin" <kevin.tian@intel.com>,
	Raj Ashok <ashok.raj@intel.com>,
	Christoph Hellwig <hch@infradead.org>,
	Lu Baolu <baolu.lu@linux.intel.com>,
	Andriy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Yi L <yi.l.liu@linux.intel.com>
Subject: Re: [PATCH v2 02/19] iommu: introduce device fault data
Date: Thu, 25 Apr 2019 15:21:05 +0200	[thread overview]
Message-ID: <220a581e-0ee8-70e2-796b-b434594e4825@redhat.com> (raw)
In-Reply-To: <f444a689-4941-524e-1d4b-c090390d5b5d@arm.com>

Hi Jean-Philippe,

On 4/25/19 2:46 PM, Jean-Philippe Brucker wrote:
> On 24/04/2019 00:31, Jacob Pan wrote:
>> diff --git a/include/uapi/linux/iommu.h b/include/uapi/linux/iommu.h
>> new file mode 100644
>> index 0000000..edcc0dd
>> --- /dev/null
>> +++ b/include/uapi/linux/iommu.h
>> @@ -0,0 +1,115 @@
>> +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
>> +/*
>> + * IOMMU user API definitions
>> + */
>> +
>> +#ifndef _UAPI_IOMMU_H
>> +#define _UAPI_IOMMU_H
>> +
>> +#include <linux/types.h>
>> +
>> +#define IOMMU_FAULT_PERM_WRITE	(1 << 0) /* write */
>> +#define IOMMU_FAULT_PERM_EXEC	(1 << 1) /* exec */
>> +#define IOMMU_FAULT_PERM_PRIV	(1 << 2) /* privileged */
> 
> Could we add IOMMU_FAULT_PERM_READ back? The PRI Page Request has both R
> and W fields, and R=W=0 encodes the PASID Stop Markers. Even though the
> IOMMU drivers currently filter out the Stop Markers, we may want to
> inject them into guests at some point in the future, which wouldn't be
> possible with the current API.

OK for me.

 We could add a
> IOMMU_FAULT_PAGE_REQUEST_PERM_VALID bit instead, but I still find it
> weird to denote the validity of a bitfield using a separate bit.
> 
> Given that three different series now rely on this, how about we send
> the fault patches separately for v5.2? I pushed the recoverable fault
> support applied on top of this, with the PERM_READ bit and cleaned up
> kernel doc, to git://linux-arm.org/linux-jpb.git sva/api

my only concern is is it likely to be upstreamed without any actual
user? In the positive, of course, I don't have any objection.

Thanks

Eric
> 
> Thanks,
> Jean
> 

  reply	other threads:[~2019-04-25 13:21 UTC|newest]

Thread overview: 74+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-23 23:31 [PATCH v2 00/19] Shared virtual address IOMMU and VT-d support Jacob Pan
2019-04-23 23:31 ` [PATCH v2 01/19] driver core: add per device iommu param Jacob Pan
2019-04-23 23:31 ` [PATCH v2 02/19] iommu: introduce device fault data Jacob Pan
2019-04-25 12:46   ` Jean-Philippe Brucker
2019-04-25 13:21     ` Auger Eric [this message]
2019-04-25 14:33       ` Jean-Philippe Brucker
2019-04-25 18:07         ` Jacob Pan
2019-04-23 23:31 ` [PATCH v2 03/19] iommu: introduce device fault report API Jacob Pan
2019-04-23 23:31 ` [PATCH v2 04/19] iommu: Introduce attach/detach_pasid_table API Jacob Pan
2019-04-23 23:31 ` [PATCH v2 05/19] iommu: Introduce cache_invalidate API Jacob Pan
2019-04-23 23:31 ` [PATCH v2 06/19] drivers core: Add I/O ASID allocator Jacob Pan
2019-04-24  6:19   ` Christoph Hellwig
2019-04-25 18:19     ` Jacob Pan
2019-04-26 11:47       ` Jean-Philippe Brucker
2019-04-26 12:21         ` Christoph Hellwig
2019-04-26 16:58           ` Jacob Pan
2019-04-25 10:17   ` Auger Eric
2019-04-25 10:41     ` Jean-Philippe Brucker
2019-04-30 20:24       ` Jacob Pan
2019-05-01 17:40         ` Jean-Philippe Brucker
2019-04-23 23:31 ` [PATCH v2 07/19] ioasid: Convert ioasid_idr to XArray Jacob Pan
2019-04-23 23:31 ` [PATCH v2 08/19] ioasid: Add custom IOASID allocator Jacob Pan
2019-04-25 10:03   ` Auger Eric
2019-04-25 21:29     ` Jacob Pan
2019-04-26  9:06       ` Auger Eric
2019-04-26 15:19         ` Jacob Pan
2019-05-06 17:59           ` Jacob Pan
2019-04-23 23:31 ` [PATCH v2 09/19] iommu/vt-d: Enlightened PASID allocation Jacob Pan
2019-04-24 17:27   ` Auger Eric
2019-04-25  7:12     ` Liu, Yi L
2019-04-25  7:40       ` Auger Eric
2019-04-25 23:01         ` Jacob Pan
2019-04-25 23:40     ` Jacob Pan
2019-04-26  7:24       ` Auger Eric
2019-04-26 15:05         ` Jacob Pan
2019-04-23 23:31 ` [PATCH v2 10/19] iommu/vt-d: Add custom allocator for IOASID Jacob Pan
2019-04-24 17:27   ` Auger Eric
2019-04-26 20:11     ` Jacob Pan
2019-04-23 23:31 ` [PATCH v2 11/19] iommu/vt-d: Replace Intel specific PASID allocator with IOASID Jacob Pan
2019-04-25 10:04   ` Auger Eric
     [not found]     ` <20190426140133.6d445315@jacob-builder>
2019-04-27  8:38       ` Auger Eric
2019-04-29 10:00         ` Jean-Philippe Brucker
2019-04-23 23:31 ` [PATCH v2 12/19] iommu/vt-d: Move domain helper to header Jacob Pan
2019-04-24 17:27   ` Auger Eric
2019-04-23 23:31 ` [PATCH v2 13/19] iommu/vt-d: Add nested translation support Jacob Pan
2019-04-26 15:42   ` Auger Eric
2019-04-26 21:57     ` Jacob Pan
2019-04-23 23:31 ` [PATCH v2 14/19] iommu: Add guest PASID bind function Jacob Pan
2019-04-26 15:53   ` Auger Eric
2019-04-26 22:11     ` Jacob Pan
2019-04-27  8:37       ` Auger Eric
2019-04-23 23:31 ` [PATCH v2 15/19] iommu/vt-d: Add bind guest PASID support Jacob Pan
2019-04-26 16:15   ` Auger Eric
2019-04-29 15:25     ` Jacob Pan
2019-04-30  7:05       ` Auger Eric
2019-04-30 17:49         ` Jacob Pan
2019-04-23 23:31 ` [PATCH v2 16/19] iommu/vtd: Clean up for SVM device list Jacob Pan
2019-04-26 16:19   ` Auger Eric
2019-04-23 23:31 ` [PATCH v2 17/19] iommu: Add max num of cache and granu types Jacob Pan
2019-04-26 16:22   ` Auger Eric
2019-04-29 16:17     ` Jacob Pan
2019-04-30  5:15       ` Auger Eric
2019-04-23 23:31 ` [PATCH v2 18/19] iommu/vt-d: Support flushing more translation cache types Jacob Pan
2019-04-27  9:04   ` Auger Eric
2019-04-29 21:29     ` Jacob Pan
2019-04-30  4:41       ` Auger Eric
2019-04-30 17:15         ` Jacob Pan
2019-04-30 17:41           ` Auger Eric
2019-04-23 23:31 ` [PATCH v2 19/19] iommu/vt-d: Add svm/sva invalidate function Jacob Pan
2019-04-26 17:23   ` Auger Eric
2019-04-29 22:41     ` Jacob Pan
2019-04-30  6:57       ` Auger Eric
2019-04-30 17:22         ` Jacob Pan
2019-04-30 17:36           ` Auger Eric

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