From: Janusz Krzysztofik <janusz.krzysztofik@linux.intel.com> To: Lu Baolu <baolu.lu@linux.intel.com> Cc: "David Woodhouse" <dwmw2@infradead.org>, "Joerg Roedel" <joro@8bytes.org>, iommu@lists.linux-foundation.org, intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org, "Michał Wajdeczko" <michal.wajdeczko@intel.com> Subject: Re: [RFC PATCH] iommu/vt-d: Fix IOMMU field not populated on device hot re-plug Date: Tue, 01 Oct 2019 17:01:02 +0200 [thread overview] Message-ID: <7739498.9tyZrNxj5X@jkrzyszt-desk.ger.corp.intel.com> (raw) In-Reply-To: <2674326.ZPvzKFr69O@jkrzyszt-desk.ger.corp.intel.com> Hi Baolu, On Tuesday, September 3, 2019 9:41:23 AM CEST Janusz Krzysztofik wrote: > Hi Baolu, > > On Tuesday, September 3, 2019 3:29:40 AM CEST Lu Baolu wrote: > > Hi Janusz, > > > > On 9/2/19 4:37 PM, Janusz Krzysztofik wrote: > > >> I am not saying that keeping data is not acceptable. I just want to > > >> check whether there are any other solutions. > > > Then reverting 458b7c8e0dde and applying this patch still resolves the > issue > > > for me. No errors appear when mappings are unmapped on device close after > the > > > device has been removed, and domain info preserved on device removal is > > > successfully reused on device re-plug. > > > > This patch doesn't look good to me although I agree that keeping data is > > acceptable. Any progress with that? Which mailing list should I watch for updates? Thanks, Janusz > > It updates dev->archdata.iommu, but leaves the hardware > > context/pasid table unchanged. This might cause problems somewhere. > > > > > > > > Is there anything else I can do to help? > > > > Can you please tell me how to reproduce the problem? > > The most simple way to reproduce the issue, assuming there are no non-Intel > graphics adapters installed, is to run the following shell commands: > > #!/bin/sh > # load i915 module > modprobe i915 > # open an i915 device and keep it open in background > cat /dev/dri/card0 >/dev/null & > sleep 2 > # simulate device unplug > echo 1 >/sys/class/drm/card0/device/remove > # make the background process close the device on exit > kill $! > > Thanks, > Janusz > > > > Keeping the per > > device domain info while device is unplugged is a bit dangerous because > > info->dev might be a wild pointer. We need to work out a clean fix. > > > > > > > > Thanks, > > > Janusz > > > > > > > Best regards, > > Baolu > > > > > > >
WARNING: multiple messages have this Message-ID (diff)
From: Janusz Krzysztofik <janusz.krzysztofik@linux.intel.com> To: Lu Baolu <baolu.lu@linux.intel.com> Cc: linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, "David Woodhouse" <dwmw2@infradead.org>, intel-gfx@lists.freedesktop.org, "Michał Wajdeczko" <michal.wajdeczko@intel.com> Subject: Re: [RFC PATCH] iommu/vt-d: Fix IOMMU field not populated on device hot re-plug Date: Tue, 01 Oct 2019 17:01:02 +0200 [thread overview] Message-ID: <7739498.9tyZrNxj5X@jkrzyszt-desk.ger.corp.intel.com> (raw) In-Reply-To: <2674326.ZPvzKFr69O@jkrzyszt-desk.ger.corp.intel.com> Hi Baolu, On Tuesday, September 3, 2019 9:41:23 AM CEST Janusz Krzysztofik wrote: > Hi Baolu, > > On Tuesday, September 3, 2019 3:29:40 AM CEST Lu Baolu wrote: > > Hi Janusz, > > > > On 9/2/19 4:37 PM, Janusz Krzysztofik wrote: > > >> I am not saying that keeping data is not acceptable. I just want to > > >> check whether there are any other solutions. > > > Then reverting 458b7c8e0dde and applying this patch still resolves the > issue > > > for me. No errors appear when mappings are unmapped on device close after > the > > > device has been removed, and domain info preserved on device removal is > > > successfully reused on device re-plug. > > > > This patch doesn't look good to me although I agree that keeping data is > > acceptable. Any progress with that? Which mailing list should I watch for updates? Thanks, Janusz > > It updates dev->archdata.iommu, but leaves the hardware > > context/pasid table unchanged. This might cause problems somewhere. > > > > > > > > Is there anything else I can do to help? > > > > Can you please tell me how to reproduce the problem? > > The most simple way to reproduce the issue, assuming there are no non-Intel > graphics adapters installed, is to run the following shell commands: > > #!/bin/sh > # load i915 module > modprobe i915 > # open an i915 device and keep it open in background > cat /dev/dri/card0 >/dev/null & > sleep 2 > # simulate device unplug > echo 1 >/sys/class/drm/card0/device/remove > # make the background process close the device on exit > kill $! > > Thanks, > Janusz > > > > Keeping the per > > device domain info while device is unplugged is a bit dangerous because > > info->dev might be a wild pointer. We need to work out a clean fix. > > > > > > > > Thanks, > > > Janusz > > > > > > > Best regards, > > Baolu > > > > > > > _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2019-10-01 15:01 UTC|newest] Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-08-22 14:29 [RFC PATCH] iommu/vt-d: Fix IOMMU field not populated on device hot re-plug Janusz Krzysztofik 2019-08-22 14:29 ` Janusz Krzysztofik 2019-08-22 15:34 ` ✓ Fi.CI.BAT: success for " Patchwork 2019-08-23 1:51 ` [RFC PATCH] " Lu Baolu 2019-08-23 1:51 ` Lu Baolu 2019-08-26 8:15 ` Janusz Krzysztofik 2019-08-26 8:15 ` Janusz Krzysztofik 2019-08-26 8:29 ` Lu Baolu 2019-08-26 8:29 ` Lu Baolu 2019-08-27 9:35 ` Janusz Krzysztofik 2019-08-27 9:35 ` Janusz Krzysztofik 2019-08-27 9:35 ` Janusz Krzysztofik 2019-08-28 0:56 ` Lu Baolu 2019-08-28 0:56 ` Lu Baolu 2019-08-28 14:17 ` Janusz Krzysztofik 2019-08-28 14:17 ` Janusz Krzysztofik 2019-08-29 1:43 ` Lu Baolu 2019-08-29 1:43 ` Lu Baolu 2019-08-29 1:43 ` Lu Baolu 2019-08-29 7:58 ` Janusz Krzysztofik 2019-08-29 7:58 ` Janusz Krzysztofik 2019-08-29 7:58 ` Janusz Krzysztofik 2019-08-29 9:08 ` Lu Baolu 2019-08-29 9:08 ` Lu Baolu 2019-09-02 8:37 ` Janusz Krzysztofik 2019-09-02 8:37 ` Janusz Krzysztofik 2019-09-03 1:29 ` Lu Baolu 2019-09-03 1:29 ` Lu Baolu 2019-09-03 7:41 ` Janusz Krzysztofik 2019-09-03 7:41 ` Janusz Krzysztofik 2019-10-01 15:01 ` Janusz Krzysztofik [this message] 2019-10-01 15:01 ` Janusz Krzysztofik 2019-10-08 2:27 ` Lu Baolu 2019-10-08 2:27 ` Lu Baolu 2019-10-08 2:27 ` Lu Baolu 2019-10-11 6:54 ` Lu Baolu 2019-10-11 6:54 ` Lu Baolu 2019-10-11 6:54 ` Lu Baolu 2019-10-11 10:27 ` Janusz Krzysztofik 2019-10-11 10:27 ` Janusz Krzysztofik 2019-10-11 10:27 ` Janusz Krzysztofik 2019-08-23 8:47 ` ✓ Fi.CI.IGT: success for " Patchwork
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