From: "joro@8bytes.org" <joro@8bytes.org>
To: "Tian, Kevin" <kevin.tian@intel.com>
Cc: Jean-Philippe Brucker <jean-philippe@linaro.org>,
"mst@redhat.com" <mst@redhat.com>,
"jasowang@redhat.com" <jasowang@redhat.com>,
"virtualization@lists.linux-foundation.org"
<virtualization@lists.linux-foundation.org>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"Boeuf, Sebastien" <sebastien.boeuf@intel.com>,
"will@kernel.org" <will@kernel.org>
Subject: Re: [PATCH 0/5] iommu/virtio: Add identity domains
Date: Mon, 18 Oct 2021 13:37:55 +0200 [thread overview]
Message-ID: <YW1ckwyJAwiKIFaQ@8bytes.org> (raw)
In-Reply-To: <BN9PR11MB5433EFF47E5FABC1D7D95F6F8CB89@BN9PR11MB5433.namprd11.prod.outlook.com>
On Thu, Oct 14, 2021 at 03:00:38AM +0000, Tian, Kevin wrote:
> I saw a concept of deferred attach in iommu core. See iommu_is_
> attach_deferred(). Currently this is vendor specific and I haven't
> looked into the exact reason why some vendor sets it now. Just
> be curious whether the same reason might be applied to virtio-iommu.
The reason for attach_deferred is kdump support, where the IOMMU driver
needs to keep the mappings from the old kernel until the device driver
of the new kernel takes over.
Regards,
Joerg
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
WARNING: multiple messages have this Message-ID (diff)
From: "joro@8bytes.org" <joro@8bytes.org>
To: "Tian, Kevin" <kevin.tian@intel.com>
Cc: Jean-Philippe Brucker <jean-philippe@linaro.org>,
"mst@redhat.com" <mst@redhat.com>,
"virtualization@lists.linux-foundation.org"
<virtualization@lists.linux-foundation.org>,
"eric.auger@redhat.com" <eric.auger@redhat.com>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"Boeuf, Sebastien" <sebastien.boeuf@intel.com>,
"will@kernel.org" <will@kernel.org>
Subject: Re: [PATCH 0/5] iommu/virtio: Add identity domains
Date: Mon, 18 Oct 2021 13:37:55 +0200 [thread overview]
Message-ID: <YW1ckwyJAwiKIFaQ@8bytes.org> (raw)
In-Reply-To: <BN9PR11MB5433EFF47E5FABC1D7D95F6F8CB89@BN9PR11MB5433.namprd11.prod.outlook.com>
On Thu, Oct 14, 2021 at 03:00:38AM +0000, Tian, Kevin wrote:
> I saw a concept of deferred attach in iommu core. See iommu_is_
> attach_deferred(). Currently this is vendor specific and I haven't
> looked into the exact reason why some vendor sets it now. Just
> be curious whether the same reason might be applied to virtio-iommu.
The reason for attach_deferred is kdump support, where the IOMMU driver
needs to keep the mappings from the old kernel until the device driver
of the new kernel takes over.
Regards,
Joerg
_______________________________________________
Virtualization mailing list
Virtualization@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/virtualization
next prev parent reply other threads:[~2021-10-18 11:38 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-13 12:10 [PATCH 0/5] iommu/virtio: Add identity domains Jean-Philippe Brucker
2021-10-13 12:10 ` Jean-Philippe Brucker
2021-10-13 12:10 ` [PATCH 1/5] iommu/virtio: Add definitions for VIRTIO_IOMMU_F_BYPASS_CONFIG Jean-Philippe Brucker
2021-10-13 12:10 ` Jean-Philippe Brucker
2021-10-13 12:10 ` [PATCH 2/5] iommu/virtio: Support bypass domains Jean-Philippe Brucker
2021-10-13 12:10 ` Jean-Philippe Brucker
2021-10-14 3:25 ` Tian, Kevin
2021-10-14 3:25 ` Tian, Kevin
2021-10-14 3:27 ` Tian, Kevin
2021-10-14 3:27 ` Tian, Kevin
2021-10-13 12:10 ` [PATCH 3/5] iommu/virtio: Sort reserved regions Jean-Philippe Brucker
2021-10-13 12:10 ` Jean-Philippe Brucker
2021-10-13 12:10 ` [PATCH 4/5] iommu/virtio: Pass end address to viommu_add_mapping() Jean-Philippe Brucker
2021-10-13 12:10 ` Jean-Philippe Brucker
2021-10-13 12:10 ` [PATCH 5/5] iommu/virtio: Support identity-mapped domains Jean-Philippe Brucker
2021-10-13 12:10 ` Jean-Philippe Brucker
2021-10-14 3:00 ` [PATCH 0/5] iommu/virtio: Add identity domains Tian, Kevin
2021-10-14 3:00 ` Tian, Kevin
2021-10-18 11:37 ` joro [this message]
2021-10-18 11:37 ` joro
2021-10-21 6:42 ` Tian, Kevin
2021-10-21 6:42 ` Tian, Kevin
2021-10-18 15:23 ` Jean-Philippe Brucker
2021-10-18 15:23 ` Jean-Philippe Brucker
2021-10-18 15:34 ` Michael S. Tsirkin
2021-10-18 15:34 ` Michael S. Tsirkin
2021-10-19 1:22 ` Jason Wang
2021-10-19 1:22 ` Jason Wang
2021-10-19 15:31 ` Jean-Philippe Brucker
2021-10-19 15:31 ` Jean-Philippe Brucker
2021-10-21 6:45 ` Tian, Kevin
2021-10-21 6:45 ` Tian, Kevin
2021-10-21 6:48 ` Tian, Kevin
2021-10-21 6:48 ` Tian, Kevin
2021-10-22 10:16 ` Michael S. Tsirkin
2021-10-22 10:16 ` Michael S. Tsirkin
2021-10-22 12:26 ` Jean-Philippe Brucker
2021-10-22 12:26 ` Jean-Philippe Brucker
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