From: Jason Gunthorpe <jgg@nvidia.com>
To: Yong Wu <yong.wu@mediatek.com>
Cc: "Tian, Kevin" <kevin.tian@intel.com>,
Nicolin Chen <nicolinc@nvidia.com>,
Baolu Lu <baolu.lu@linux.intel.com>,
"linux-s390@vger.kernel.org" <linux-s390@vger.kernel.org>,
"cohuck@redhat.com" <cohuck@redhat.com>,
"jordan@cosmicpenguin.net" <jordan@cosmicpenguin.net>,
"linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>,
"thierry.reding@gmail.com" <thierry.reding@gmail.com>,
"will@kernel.org" <will@kernel.org>,
"alyssa@rosenzweig.io" <alyssa@rosenzweig.io>,
"jean-philippe@linaro.org" <jean-philippe@linaro.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"zhang.lyra@gmail.com" <zhang.lyra@gmail.com>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"jonathanh@nvidia.com" <jonathanh@nvidia.com>,
"yangyingliang@huawei.com" <yangyingliang@huawei.com>,
"orsonzhai@gmail.com" <orsonzhai@gmail.com>,
"gerald.schaefer@linux.ibm.com" <gerald.schaefer@linux.ibm.com>,
"linux-arm-msm@vger.kernel.org" <linux-arm-msm@vger.kernel.org>,
"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"christophe.jaillet@wanadoo.fr" <christophe.jaillet@wanadoo.fr>,
"matthias.bgg@gmail.com" <matthias.bgg@gmail.com>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"virtualization@lists.linux-foundation.org"
<virtualization@lists.linux-foundation.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"dwmw2@infradead.org" <dwmw2@infradead.org>,
"marcan@marcan.st" <marcan@marcan.st>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"baolin.wang7@gmail.com" <baolin.wang7@gmail.com>,
"linux-mediatek@lists.infradead.org"
<linux-mediatek@lists.infradead.org>,
"robin.murphy@arm.com" <robin.murphy@arm.com>
Subject: Re: [PATCH v3 1/5] iommu: Return -EMEDIUMTYPE for incompatible domain and device/group
Date: Fri, 24 Jun 2022 15:19:43 -0300 [thread overview]
Message-ID: <20220624181943.GV4147@nvidia.com> (raw)
In-Reply-To: <19cfb1b85a347c70c6b0937bbbca4a176a724454.camel@mediatek.com>
On Fri, Jun 24, 2022 at 06:35:49PM +0800, Yong Wu wrote:
> > > It's not used in VFIO context. "return 0" just satisfy the iommu
> > > framework to go ahead. and yes, here we only allow the shared
> > > "mapping-domain" (All the devices share a domain created
> > > internally).
What part of the iommu framework is trying to attach a domain and
wants to see success when the domain was not actually attached ?
> > What prevent this driver from being used in VFIO context?
>
> Nothing prevent this. Just I didn't test.
This is why it is wrong to return success here.
Jason
WARNING: multiple messages have this Message-ID (diff)
From: Jason Gunthorpe via iommu <iommu@lists.linux-foundation.org>
To: Yong Wu <yong.wu@mediatek.com>
Cc: "marcan@marcan.st" <marcan@marcan.st>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"jordan@cosmicpenguin.net" <jordan@cosmicpenguin.net>,
"linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>,
"thierry.reding@gmail.com" <thierry.reding@gmail.com>,
"will@kernel.org" <will@kernel.org>,
"alyssa@rosenzweig.io" <alyssa@rosenzweig.io>,
"linux-s390@vger.kernel.org" <linux-s390@vger.kernel.org>,
"zhang.lyra@gmail.com" <zhang.lyra@gmail.com>,
"jonathanh@nvidia.com" <jonathanh@nvidia.com>,
"yangyingliang@huawei.com" <yangyingliang@huawei.com>,
"orsonzhai@gmail.com" <orsonzhai@gmail.com>,
"gerald.schaefer@linux.ibm.com" <gerald.schaefer@linux.ibm.com>,
"Tian, Kevin" <kevin.tian@intel.com>,
"jean-philippe@linaro.org" <jean-philippe@linaro.org>,
"linux-arm-msm@vger.kernel.org" <linux-arm-msm@vger.kernel.org>,
"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"christophe.jaillet@wanadoo.fr" <christophe.jaillet@wanadoo.fr>,
"matthias.bgg@gmail.com" <matthias.bgg@gmail.com>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"virtualization@lists.linux-foundation.org"
<virtualization@lists.linux-foundation.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"robin.murphy@arm.com" <robin.murphy@arm.com>,
"cohuck@redhat.com" <cohuck@redhat.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"baolin.wang7@gmail.com" <baolin.wang7@gmail.com>,
"linux-mediatek@lists.infradead.org"
<linux-mediatek@lists.infradead.org>,
"dwmw2@infradead.org" <dwmw2@infradead.org>
Subject: Re: [PATCH v3 1/5] iommu: Return -EMEDIUMTYPE for incompatible domain and device/group
Date: Fri, 24 Jun 2022 15:19:43 -0300 [thread overview]
Message-ID: <20220624181943.GV4147@nvidia.com> (raw)
In-Reply-To: <19cfb1b85a347c70c6b0937bbbca4a176a724454.camel@mediatek.com>
On Fri, Jun 24, 2022 at 06:35:49PM +0800, Yong Wu wrote:
> > > It's not used in VFIO context. "return 0" just satisfy the iommu
> > > framework to go ahead. and yes, here we only allow the shared
> > > "mapping-domain" (All the devices share a domain created
> > > internally).
What part of the iommu framework is trying to attach a domain and
wants to see success when the domain was not actually attached ?
> > What prevent this driver from being used in VFIO context?
>
> Nothing prevent this. Just I didn't test.
This is why it is wrong to return success here.
Jason
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
WARNING: multiple messages have this Message-ID (diff)
From: Jason Gunthorpe <jgg@nvidia.com>
To: Yong Wu <yong.wu@mediatek.com>
Cc: "Tian, Kevin" <kevin.tian@intel.com>,
Nicolin Chen <nicolinc@nvidia.com>,
Baolu Lu <baolu.lu@linux.intel.com>,
"linux-s390@vger.kernel.org" <linux-s390@vger.kernel.org>,
"cohuck@redhat.com" <cohuck@redhat.com>,
"jordan@cosmicpenguin.net" <jordan@cosmicpenguin.net>,
"linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>,
"thierry.reding@gmail.com" <thierry.reding@gmail.com>,
"will@kernel.org" <will@kernel.org>,
"alyssa@rosenzweig.io" <alyssa@rosenzweig.io>,
"jean-philippe@linaro.org" <jean-philippe@linaro.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"zhang.lyra@gmail.com" <zhang.lyra@gmail.com>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"jonathanh@nvidia.com" <jonathanh@nvidia.com>,
"yangyingliang@huawei.com" <yangyingliang@huawei.com>,
"orsonzhai@gmail.com" <orsonzhai@gmail.com>,
"gerald.schaefer@linux.ibm.com" <gerald.schaefer@linux.ibm.com>,
"linux-arm-msm@vger.kernel.org" <linux-arm-msm@vger.kernel.org>,
"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"christophe.jaillet@wanadoo.fr" <christophe.jaillet@wanadoo.fr>,
"matthias.bgg@gmail.com" <matthias.bgg@gmail.com>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"virtualization@lists.linux-foundation.org"
<virtualization@lists.linux-foundation.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"dwmw2@infradead.org" <dwmw2@infradead.org>,
"marcan@marcan.st" <marcan@marcan.st>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"baolin.wang7@gmail.com" <baolin.wang7@gmail.com>,
"linux-mediatek@lists.infradead.org"
<linux-mediatek@lists.infradead.org>,
"robin.murphy@arm.com" <robin.murphy@arm.com>
Subject: Re: [PATCH v3 1/5] iommu: Return -EMEDIUMTYPE for incompatible domain and device/group
Date: Fri, 24 Jun 2022 15:19:43 -0300 [thread overview]
Message-ID: <20220624181943.GV4147@nvidia.com> (raw)
In-Reply-To: <19cfb1b85a347c70c6b0937bbbca4a176a724454.camel@mediatek.com>
On Fri, Jun 24, 2022 at 06:35:49PM +0800, Yong Wu wrote:
> > > It's not used in VFIO context. "return 0" just satisfy the iommu
> > > framework to go ahead. and yes, here we only allow the shared
> > > "mapping-domain" (All the devices share a domain created
> > > internally).
What part of the iommu framework is trying to attach a domain and
wants to see success when the domain was not actually attached ?
> > What prevent this driver from being used in VFIO context?
>
> Nothing prevent this. Just I didn't test.
This is why it is wrong to return success here.
Jason
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2022-06-24 18:19 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-23 20:00 [PATCH v3 0/5] Simplify vfio_iommu_type1 attach/detach routine Nicolin Chen
2022-06-23 20:00 ` Nicolin Chen
2022-06-23 20:00 ` Nicolin Chen via iommu
2022-06-23 20:00 ` [PATCH v3 1/5] iommu: Return -EMEDIUMTYPE for incompatible domain and device/group Nicolin Chen
2022-06-23 20:00 ` Nicolin Chen
2022-06-23 20:00 ` Nicolin Chen via iommu
2022-06-24 1:35 ` Baolu Lu
2022-06-24 1:35 ` Baolu Lu
2022-06-24 1:35 ` Baolu Lu
2022-06-24 2:44 ` Nicolin Chen
2022-06-24 2:44 ` Nicolin Chen
2022-06-24 2:44 ` Nicolin Chen via iommu
2022-06-24 5:38 ` Yong Wu
2022-06-24 5:38 ` Yong Wu
2022-06-24 5:38 ` Yong Wu via iommu
2022-06-24 5:41 ` Nicolin Chen
2022-06-24 5:41 ` Nicolin Chen
2022-06-24 5:41 ` Nicolin Chen via iommu
2022-06-24 6:16 ` Tian, Kevin
2022-06-24 6:16 ` Tian, Kevin
2022-06-24 6:16 ` Tian, Kevin
2022-06-24 6:16 ` Tian, Kevin
2022-06-24 10:35 ` Yong Wu
2022-06-24 10:35 ` Yong Wu
2022-06-24 10:35 ` Yong Wu via iommu
2022-06-24 18:19 ` Jason Gunthorpe [this message]
2022-06-24 18:19 ` Jason Gunthorpe
2022-06-24 18:19 ` Jason Gunthorpe via iommu
2022-06-29 19:47 ` Nicolin Chen
2022-06-29 19:47 ` Nicolin Chen
2022-06-29 19:47 ` Nicolin Chen via iommu
2022-06-30 8:21 ` Robin Murphy
2022-06-30 8:21 ` Robin Murphy
2022-06-30 8:21 ` Robin Murphy
2022-06-30 8:21 ` Robin Murphy
2022-06-30 9:57 ` Tian, Kevin
2022-06-30 9:57 ` Tian, Kevin
2022-06-30 9:57 ` Tian, Kevin
2022-06-30 9:57 ` Tian, Kevin
2022-06-30 15:47 ` Nicolin Chen
2022-06-30 15:47 ` Nicolin Chen
2022-06-30 15:47 ` Nicolin Chen via iommu
2022-06-30 9:33 ` Yong Wu
2022-06-30 9:33 ` Yong Wu
2022-06-30 9:33 ` Yong Wu via iommu
2022-06-30 15:45 ` Nicolin Chen
2022-06-30 15:45 ` Nicolin Chen
2022-06-30 15:45 ` Nicolin Chen via iommu
2022-06-23 20:00 ` [PATCH v3 2/5] vfio/iommu_type1: Prefer to reuse domains vs match enforced cache coherency Nicolin Chen
2022-06-23 20:00 ` Nicolin Chen
2022-06-23 20:00 ` Nicolin Chen via iommu
2022-06-24 1:50 ` Baolu Lu
2022-06-24 1:50 ` Baolu Lu
2022-06-24 1:50 ` Baolu Lu
2022-06-23 20:00 ` [PATCH v3 3/5] vfio/iommu_type1: Remove the domain->ops comparison Nicolin Chen
2022-06-23 20:00 ` Nicolin Chen
2022-06-23 20:00 ` Nicolin Chen via iommu
2022-06-24 18:28 ` Jason Gunthorpe
2022-06-24 18:28 ` Jason Gunthorpe
2022-06-24 18:28 ` Jason Gunthorpe via iommu
2022-06-24 18:46 ` Jason Gunthorpe
2022-06-24 18:46 ` Jason Gunthorpe
2022-06-24 18:46 ` Jason Gunthorpe via iommu
2022-06-23 20:00 ` [PATCH v3 4/5] vfio/iommu_type1: Clean up update_dirty_scope in detach_group() Nicolin Chen
2022-06-23 20:00 ` Nicolin Chen
2022-06-23 20:00 ` Nicolin Chen via iommu
2022-06-23 20:00 ` [PATCH v3 5/5] vfio/iommu_type1: Simplify group attachment Nicolin Chen
2022-06-23 20:00 ` Nicolin Chen
2022-06-23 20:00 ` Nicolin Chen via iommu
2022-06-27 6:57 ` Tian, Kevin
2022-06-27 6:57 ` Tian, Kevin
2022-06-27 6:57 ` Tian, Kevin
2022-06-27 6:57 ` Tian, Kevin
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