From: Alexey Kardashevskiy <aik@ozlabs.ru>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: David Gibson <david@gibson.dropbear.id.au>,
Alex Williamson <alex.williamson@redhat.com>,
Jean-Philippe Brucker <jean-philippe@linaro.org>,
Chaitanya Kulkarni <chaitanyak@nvidia.com>,
kvm@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>,
Jason Wang <jasowang@redhat.com>,
Cornelia Huck <cohuck@redhat.com>,
Niklas Schnelle <schnelle@linux.ibm.com>,
Kevin Tian <kevin.tian@intel.com>,
Daniel Jordan <daniel.m.jordan@oracle.com>,
iommu@lists.linux-foundation.org,
Joao Martins <joao.m.martins@oracle.com>
Subject: Re: [PATCH RFC 11/12] iommufd: vfio container FD ioctl compatibility
Date: Wed, 25 May 2022 12:09:46 +1000 [thread overview]
Message-ID: <dde9738f-784f-ea7c-4318-a9260ee00683@ozlabs.ru> (raw)
In-Reply-To: <20220524132553.GR1343366@nvidia.com>
On 5/24/22 23:25, Jason Gunthorpe wrote:
> On Mon, May 23, 2022 at 04:02:22PM +1000, Alexey Kardashevskiy wrote:
>
>> Which means the guest RAM does not need to be all mapped in that base IOAS
>> suggested down this thread as that would mean all memory is pinned and
>> powervm won't be able to swap it out (yeah, it can do such thing now!). Not
>> sure if we really want to support this or stick to a simpler design.
>
> Huh? How can it swap? Calling GUP is not optional. Either you call GUP
> at the start and there is no swap, or you call GUP for each vIOMMU
> hypercall.
Correct, not optional.
> Since everyone says PPC doesn't call GUP during the hypercall - how is
> it working?
It does not call GUP during hypercalls because all VM pages are GUPed in
advance at a special memory preregistration step as we could not call
GUP from a hypercall handler with MMU off (often the case with POWER8
when this was developed in the first place). Things are better with
POWER9 (bare metal can do all sorts of things pretty much) but the
PowerVM interface with 2 windows is still there and this iommufd
proposal is going to be ported on top of PowerVM at first.
I am just saying there is a model when not everything is mapped and this
has its use. The PowerVM's swapping capability is something new and I do
not really know how that works though.
--
Alexey
WARNING: multiple messages have this Message-ID (diff)
From: Alexey Kardashevskiy <aik@ozlabs.ru>
To: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jean-Philippe Brucker <jean-philippe@linaro.org>,
Chaitanya Kulkarni <chaitanyak@nvidia.com>,
kvm@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>,
Jason Wang <jasowang@redhat.com>,
Cornelia Huck <cohuck@redhat.com>,
Niklas Schnelle <schnelle@linux.ibm.com>,
Kevin Tian <kevin.tian@intel.com>,
iommu@lists.linux-foundation.org,
Daniel Jordan <daniel.m.jordan@oracle.com>,
Alex Williamson <alex.williamson@redhat.com>,
Joao Martins <joao.m.martins@oracle.com>,
David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [PATCH RFC 11/12] iommufd: vfio container FD ioctl compatibility
Date: Wed, 25 May 2022 12:09:46 +1000 [thread overview]
Message-ID: <dde9738f-784f-ea7c-4318-a9260ee00683@ozlabs.ru> (raw)
In-Reply-To: <20220524132553.GR1343366@nvidia.com>
On 5/24/22 23:25, Jason Gunthorpe wrote:
> On Mon, May 23, 2022 at 04:02:22PM +1000, Alexey Kardashevskiy wrote:
>
>> Which means the guest RAM does not need to be all mapped in that base IOAS
>> suggested down this thread as that would mean all memory is pinned and
>> powervm won't be able to swap it out (yeah, it can do such thing now!). Not
>> sure if we really want to support this or stick to a simpler design.
>
> Huh? How can it swap? Calling GUP is not optional. Either you call GUP
> at the start and there is no swap, or you call GUP for each vIOMMU
> hypercall.
Correct, not optional.
> Since everyone says PPC doesn't call GUP during the hypercall - how is
> it working?
It does not call GUP during hypercalls because all VM pages are GUPed in
advance at a special memory preregistration step as we could not call
GUP from a hypercall handler with MMU off (often the case with POWER8
when this was developed in the first place). Things are better with
POWER9 (bare metal can do all sorts of things pretty much) but the
PowerVM interface with 2 windows is still there and this iommufd
proposal is going to be ported on top of PowerVM at first.
I am just saying there is a model when not everything is mapped and this
has its use. The PowerVM's swapping capability is something new and I do
not really know how that works though.
--
Alexey
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2022-05-25 2:09 UTC|newest]
Thread overview: 244+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-18 17:27 [PATCH RFC 00/12] IOMMUFD Generic interface Jason Gunthorpe
2022-03-18 17:27 ` Jason Gunthorpe via iommu
2022-03-18 17:27 ` [PATCH RFC 01/12] interval-tree: Add a utility to iterate over spans in an interval tree Jason Gunthorpe
2022-03-18 17:27 ` Jason Gunthorpe via iommu
2022-03-18 17:27 ` [PATCH RFC 02/12] iommufd: Overview documentation Jason Gunthorpe
2022-03-18 17:27 ` Jason Gunthorpe via iommu
2022-03-18 17:27 ` [PATCH RFC 03/12] iommufd: File descriptor, context, kconfig and makefiles Jason Gunthorpe
2022-03-18 17:27 ` Jason Gunthorpe via iommu
2022-03-22 14:18 ` Niklas Schnelle
2022-03-22 14:18 ` Niklas Schnelle
2022-03-22 14:50 ` Jason Gunthorpe
2022-03-22 14:50 ` Jason Gunthorpe via iommu
2022-03-18 17:27 ` [PATCH RFC 04/12] kernel/user: Allow user::locked_vm to be usable for iommufd Jason Gunthorpe
2022-03-18 17:27 ` Jason Gunthorpe via iommu
2022-03-22 14:28 ` Niklas Schnelle
2022-03-22 14:28 ` Niklas Schnelle
2022-03-22 14:57 ` Jason Gunthorpe
2022-03-22 14:57 ` Jason Gunthorpe via iommu
2022-03-22 15:29 ` Alex Williamson
2022-03-22 15:29 ` Alex Williamson
2022-03-22 16:15 ` Jason Gunthorpe
2022-03-22 16:15 ` Jason Gunthorpe via iommu
2022-03-24 2:11 ` Tian, Kevin
2022-03-24 2:11 ` Tian, Kevin
2022-03-24 2:27 ` Jason Wang
2022-03-24 2:27 ` Jason Wang
2022-03-24 2:42 ` Tian, Kevin
2022-03-24 2:42 ` Tian, Kevin
2022-03-24 2:57 ` Jason Wang
2022-03-24 2:57 ` Jason Wang
2022-03-24 3:15 ` Tian, Kevin
2022-03-24 3:15 ` Tian, Kevin
2022-03-24 3:50 ` Jason Wang
2022-03-24 3:50 ` Jason Wang
2022-03-24 4:29 ` Tian, Kevin
2022-03-24 4:29 ` Tian, Kevin
2022-03-24 11:46 ` Jason Gunthorpe
2022-03-24 11:46 ` Jason Gunthorpe via iommu
2022-03-28 1:53 ` Jason Wang
2022-03-28 1:53 ` Jason Wang
2022-03-28 12:22 ` Jason Gunthorpe
2022-03-28 12:22 ` Jason Gunthorpe via iommu
2022-03-29 4:59 ` Jason Wang
2022-03-29 4:59 ` Jason Wang
2022-03-29 11:46 ` Jason Gunthorpe
2022-03-29 11:46 ` Jason Gunthorpe via iommu
2022-03-28 13:14 ` Sean Mooney
2022-03-28 13:14 ` Sean Mooney
2022-03-28 14:27 ` Jason Gunthorpe via iommu
2022-03-28 14:27 ` Jason Gunthorpe
2022-03-24 20:40 ` Alex Williamson
2022-03-24 20:40 ` Alex Williamson
2022-03-24 22:27 ` Jason Gunthorpe
2022-03-24 22:27 ` Jason Gunthorpe via iommu
2022-03-24 22:41 ` Alex Williamson
2022-03-24 22:41 ` Alex Williamson
2022-03-22 16:31 ` Niklas Schnelle
2022-03-22 16:31 ` Niklas Schnelle
2022-03-22 16:41 ` Jason Gunthorpe via iommu
2022-03-22 16:41 ` Jason Gunthorpe
2022-03-18 17:27 ` [PATCH RFC 05/12] iommufd: PFN handling for iopt_pages Jason Gunthorpe
2022-03-18 17:27 ` Jason Gunthorpe via iommu
2022-03-23 15:37 ` Niklas Schnelle
2022-03-23 15:37 ` Niklas Schnelle
2022-03-23 16:09 ` Jason Gunthorpe
2022-03-23 16:09 ` Jason Gunthorpe via iommu
2022-03-18 17:27 ` [PATCH RFC 06/12] iommufd: Algorithms for PFN storage Jason Gunthorpe
2022-03-18 17:27 ` Jason Gunthorpe via iommu
2022-03-18 17:27 ` [PATCH RFC 07/12] iommufd: Data structure to provide IOVA to PFN mapping Jason Gunthorpe
2022-03-18 17:27 ` Jason Gunthorpe via iommu
2022-03-22 22:15 ` Alex Williamson
2022-03-22 22:15 ` Alex Williamson
2022-03-23 18:15 ` Jason Gunthorpe
2022-03-23 18:15 ` Jason Gunthorpe via iommu
2022-03-24 3:09 ` Tian, Kevin
2022-03-24 3:09 ` Tian, Kevin
2022-03-24 12:46 ` Jason Gunthorpe
2022-03-24 12:46 ` Jason Gunthorpe via iommu
2022-03-25 13:34 ` zhangfei.gao
2022-03-25 13:34 ` zhangfei.gao
2022-03-25 17:19 ` Jason Gunthorpe via iommu
2022-03-25 17:19 ` Jason Gunthorpe
2022-04-13 14:02 ` Yi Liu
2022-04-13 14:02 ` Yi Liu
2022-04-13 14:36 ` Jason Gunthorpe
2022-04-13 14:36 ` Jason Gunthorpe via iommu
2022-04-13 14:49 ` Yi Liu
2022-04-13 14:49 ` Yi Liu
2022-04-17 14:56 ` Yi Liu
2022-04-17 14:56 ` Yi Liu
2022-04-18 10:47 ` Yi Liu
2022-04-18 10:47 ` Yi Liu
2022-03-18 17:27 ` [PATCH RFC 08/12] iommufd: IOCTLs for the io_pagetable Jason Gunthorpe
2022-03-18 17:27 ` Jason Gunthorpe via iommu
2022-03-23 19:10 ` Alex Williamson
2022-03-23 19:10 ` Alex Williamson
2022-03-23 19:34 ` Jason Gunthorpe
2022-03-23 19:34 ` Jason Gunthorpe via iommu
2022-03-23 20:04 ` Alex Williamson
2022-03-23 20:04 ` Alex Williamson
2022-03-23 20:34 ` Jason Gunthorpe via iommu
2022-03-23 20:34 ` Jason Gunthorpe
2022-03-23 22:54 ` Jason Gunthorpe
2022-03-23 22:54 ` Jason Gunthorpe via iommu
2022-03-24 7:25 ` Tian, Kevin
2022-03-24 7:25 ` Tian, Kevin
2022-03-24 13:46 ` Jason Gunthorpe via iommu
2022-03-24 13:46 ` Jason Gunthorpe
2022-03-25 2:15 ` Tian, Kevin
2022-03-25 2:15 ` Tian, Kevin
2022-03-27 2:32 ` Tian, Kevin
2022-03-27 2:32 ` Tian, Kevin
2022-03-27 14:28 ` Jason Gunthorpe
2022-03-27 14:28 ` Jason Gunthorpe via iommu
2022-03-28 17:17 ` Alex Williamson
2022-03-28 17:17 ` Alex Williamson
2022-03-28 18:57 ` Jason Gunthorpe
2022-03-28 18:57 ` Jason Gunthorpe via iommu
2022-03-28 19:47 ` Jason Gunthorpe via iommu
2022-03-28 19:47 ` Jason Gunthorpe
2022-03-28 21:26 ` Alex Williamson
2022-03-28 21:26 ` Alex Williamson
2022-03-24 6:46 ` Tian, Kevin
2022-03-24 6:46 ` Tian, Kevin
2022-03-30 13:35 ` Yi Liu
2022-03-30 13:35 ` Yi Liu
2022-03-31 12:59 ` Jason Gunthorpe via iommu
2022-03-31 12:59 ` Jason Gunthorpe
2022-04-01 13:30 ` Yi Liu
2022-04-01 13:30 ` Yi Liu
2022-03-31 4:36 ` David Gibson
2022-03-31 4:36 ` David Gibson
2022-03-31 5:41 ` Tian, Kevin
2022-03-31 5:41 ` Tian, Kevin
2022-03-31 12:58 ` Jason Gunthorpe via iommu
2022-03-31 12:58 ` Jason Gunthorpe
2022-04-28 5:58 ` David Gibson
2022-04-28 5:58 ` David Gibson
2022-04-28 14:22 ` Jason Gunthorpe
2022-04-28 14:22 ` Jason Gunthorpe via iommu
2022-04-29 6:00 ` David Gibson
2022-04-29 6:00 ` David Gibson
2022-04-29 12:54 ` Jason Gunthorpe
2022-04-29 12:54 ` Jason Gunthorpe via iommu
2022-04-30 14:44 ` David Gibson
2022-04-30 14:44 ` David Gibson
2022-03-18 17:27 ` [PATCH RFC 09/12] iommufd: Add a HW pagetable object Jason Gunthorpe
2022-03-18 17:27 ` Jason Gunthorpe via iommu
2022-03-18 17:27 ` [PATCH RFC 10/12] iommufd: Add kAPI toward external drivers Jason Gunthorpe
2022-03-18 17:27 ` Jason Gunthorpe via iommu
2022-03-23 18:10 ` Alex Williamson
2022-03-23 18:10 ` Alex Williamson
2022-03-23 18:15 ` Jason Gunthorpe
2022-03-23 18:15 ` Jason Gunthorpe via iommu
2022-05-11 12:54 ` Yi Liu
2022-05-11 12:54 ` Yi Liu
2022-05-19 9:45 ` Yi Liu
2022-05-19 9:45 ` Yi Liu
2022-05-19 12:35 ` Jason Gunthorpe
2022-05-19 12:35 ` Jason Gunthorpe via iommu
2022-03-18 17:27 ` [PATCH RFC 11/12] iommufd: vfio container FD ioctl compatibility Jason Gunthorpe
2022-03-18 17:27 ` Jason Gunthorpe via iommu
2022-03-23 22:51 ` Alex Williamson
2022-03-23 22:51 ` Alex Williamson
2022-03-24 0:33 ` Jason Gunthorpe
2022-03-24 0:33 ` Jason Gunthorpe via iommu
2022-03-24 8:13 ` Eric Auger
2022-03-24 8:13 ` Eric Auger
2022-03-24 22:04 ` Alex Williamson
2022-03-24 22:04 ` Alex Williamson
2022-03-24 23:11 ` Jason Gunthorpe
2022-03-24 23:11 ` Jason Gunthorpe via iommu
2022-03-25 3:10 ` Tian, Kevin
2022-03-25 3:10 ` Tian, Kevin
2022-03-25 11:24 ` Joao Martins
2022-03-25 11:24 ` Joao Martins
2022-04-28 14:53 ` David Gibson
2022-04-28 14:53 ` David Gibson
2022-04-28 15:10 ` Jason Gunthorpe
2022-04-28 15:10 ` Jason Gunthorpe via iommu
2022-04-29 1:21 ` Tian, Kevin
2022-04-29 1:21 ` Tian, Kevin
2022-04-29 6:22 ` David Gibson
2022-04-29 6:22 ` David Gibson
2022-04-29 12:50 ` Jason Gunthorpe
2022-04-29 12:50 ` Jason Gunthorpe via iommu
2022-05-02 4:10 ` David Gibson
2022-05-02 4:10 ` David Gibson
2022-04-29 6:20 ` David Gibson
2022-04-29 6:20 ` David Gibson
2022-04-29 12:48 ` Jason Gunthorpe
2022-04-29 12:48 ` Jason Gunthorpe via iommu
2022-05-02 7:30 ` David Gibson
2022-05-02 7:30 ` David Gibson
2022-05-05 19:07 ` Jason Gunthorpe
2022-05-05 19:07 ` Jason Gunthorpe via iommu
2022-05-06 5:25 ` David Gibson
2022-05-06 5:25 ` David Gibson
2022-05-06 10:42 ` Tian, Kevin
2022-05-06 10:42 ` Tian, Kevin
2022-05-09 3:36 ` David Gibson
2022-05-09 3:36 ` David Gibson
2022-05-06 12:48 ` Jason Gunthorpe
2022-05-06 12:48 ` Jason Gunthorpe via iommu
2022-05-09 6:01 ` David Gibson
2022-05-09 6:01 ` David Gibson
2022-05-09 14:00 ` Jason Gunthorpe
2022-05-09 14:00 ` Jason Gunthorpe via iommu
2022-05-10 7:12 ` David Gibson
2022-05-10 7:12 ` David Gibson
2022-05-10 19:00 ` Jason Gunthorpe
2022-05-10 19:00 ` Jason Gunthorpe via iommu
2022-05-11 3:15 ` Tian, Kevin
2022-05-11 3:15 ` Tian, Kevin
2022-05-11 16:32 ` Jason Gunthorpe
2022-05-11 16:32 ` Jason Gunthorpe via iommu
2022-05-11 23:23 ` Tian, Kevin
2022-05-11 23:23 ` Tian, Kevin
2022-05-13 4:35 ` David Gibson
2022-05-13 4:35 ` David Gibson
2022-05-11 4:40 ` David Gibson
2022-05-11 4:40 ` David Gibson
2022-05-11 2:46 ` Tian, Kevin
2022-05-11 2:46 ` Tian, Kevin
2022-05-23 6:02 ` Alexey Kardashevskiy
2022-05-23 6:02 ` Alexey Kardashevskiy
2022-05-24 13:25 ` Jason Gunthorpe
2022-05-24 13:25 ` Jason Gunthorpe via iommu
2022-05-25 1:39 ` David Gibson
2022-05-25 1:39 ` David Gibson
2022-05-25 2:09 ` Alexey Kardashevskiy [this message]
2022-05-25 2:09 ` Alexey Kardashevskiy
2022-03-29 9:17 ` Yi Liu
2022-03-29 9:17 ` Yi Liu
2022-03-18 17:27 ` [PATCH RFC 12/12] iommufd: Add a selftest Jason Gunthorpe
2022-03-18 17:27 ` Jason Gunthorpe via iommu
2022-04-12 20:13 ` [PATCH RFC 00/12] IOMMUFD Generic interface Eric Auger
2022-04-12 20:13 ` Eric Auger
2022-04-12 20:22 ` Jason Gunthorpe via iommu
2022-04-12 20:22 ` Jason Gunthorpe
2022-04-12 20:50 ` Eric Auger
2022-04-12 20:50 ` Eric Auger
2022-04-14 10:56 ` Yi Liu
2022-04-14 10:56 ` Yi Liu
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