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From: David Gibson <david@gibson.dropbear.id.au>
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>
Subject: Re: [PATCH RFC 11/12] iommufd: vfio container FD ioctl compatibility
Date: Wed, 25 May 2022 11:39:39 +1000	[thread overview]
Message-ID: <Yo2I2zfDTEg8+PjE@yekko> (raw)
In-Reply-To: <20220524132553.GR1343366@nvidia.com>


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On Tue, May 24, 2022 at 10:25:53AM -0300, 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.
> 
> Since everyone says PPC doesn't call GUP during the hypercall - how is
> it working?

The current implementation does GUP during the pre-reserve.  I think
Alexey's talking about a new PowerVM (IBM hypervisor) feature; I don't
know how that works.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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  reply	other threads:[~2022-05-25  1:48 UTC|newest]

Thread overview: 122+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-18 17:27 [PATCH RFC 00/12] IOMMUFD Generic interface 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 via iommu
2022-03-18 17:27 ` [PATCH RFC 02/12] iommufd: Overview documentation Jason Gunthorpe via iommu
2022-03-18 17:27 ` [PATCH RFC 03/12] iommufd: File descriptor, context, kconfig and makefiles Jason Gunthorpe via iommu
2022-03-22 14:18   ` Niklas Schnelle
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 via iommu
2022-03-22 14:28   ` Niklas Schnelle
2022-03-22 14:57     ` Jason Gunthorpe via iommu
2022-03-22 15:29       ` Alex Williamson
2022-03-22 16:15         ` Jason Gunthorpe via iommu
2022-03-24  2:11           ` Tian, Kevin
2022-03-24  2:27             ` Jason Wang
2022-03-24  2:42               ` Tian, Kevin
2022-03-24  2:57                 ` Jason Wang
2022-03-24  3:15                   ` Tian, Kevin
2022-03-24  3:50                     ` Jason Wang
2022-03-24  4:29                       ` Tian, Kevin
2022-03-24 11:46                       ` Jason Gunthorpe via iommu
2022-03-28  1:53                         ` Jason Wang
2022-03-28 12:22                           ` Jason Gunthorpe via iommu
2022-03-29  4:59                             ` Jason Wang
2022-03-29 11:46                               ` Jason Gunthorpe via iommu
2022-03-28 13:14                           ` Sean Mooney
2022-03-28 14:27                             ` Jason Gunthorpe via iommu
2022-03-24 20:40           ` Alex Williamson
2022-03-24 22:27             ` Jason Gunthorpe via iommu
2022-03-24 22:41               ` Alex Williamson
2022-03-22 16:31       ` Niklas Schnelle
2022-03-22 16:41         ` Jason Gunthorpe via iommu
2022-03-18 17:27 ` [PATCH RFC 05/12] iommufd: PFN handling for iopt_pages Jason Gunthorpe via iommu
2022-03-23 15:37   ` Niklas Schnelle
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 via iommu
2022-03-18 17:27 ` [PATCH RFC 07/12] iommufd: Data structure to provide IOVA to PFN mapping Jason Gunthorpe via iommu
2022-03-22 22:15   ` Alex Williamson
2022-03-23 18:15     ` Jason Gunthorpe via iommu
2022-03-24  3:09       ` Tian, Kevin
2022-03-24 12:46         ` Jason Gunthorpe via iommu
2022-03-25 13:34   ` zhangfei.gao
2022-03-25 17:19     ` Jason Gunthorpe via iommu
2022-04-13 14:02   ` Yi Liu
2022-04-13 14:36     ` Jason Gunthorpe via iommu
2022-04-13 14:49       ` Yi Liu
2022-04-17 14:56         ` 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 via iommu
2022-03-23 19:10   ` Alex Williamson
2022-03-23 19:34     ` Jason Gunthorpe via iommu
2022-03-23 20:04       ` Alex Williamson
2022-03-23 20:34         ` Jason Gunthorpe via iommu
2022-03-23 22:54           ` Jason Gunthorpe via iommu
2022-03-24  7:25             ` Tian, Kevin
2022-03-24 13:46               ` Jason Gunthorpe via iommu
2022-03-25  2:15                 ` Tian, Kevin
2022-03-27  2:32                 ` Tian, Kevin
2022-03-27 14:28                   ` Jason Gunthorpe via iommu
2022-03-28 17:17                 ` Alex Williamson
2022-03-28 18:57                   ` Jason Gunthorpe via iommu
2022-03-28 19:47                     ` Jason Gunthorpe via iommu
2022-03-28 21:26                       ` Alex Williamson
2022-03-24  6:46           ` Tian, Kevin
2022-03-30 13:35   ` Yi Liu
2022-03-31 12:59     ` Jason Gunthorpe via iommu
2022-04-01 13:30       ` Yi Liu
2022-03-31  4:36   ` David Gibson
2022-03-31  5:41     ` Tian, Kevin
2022-03-31 12:58     ` Jason Gunthorpe via iommu
2022-04-28  5:58       ` David Gibson
2022-04-28 14:22         ` Jason Gunthorpe via iommu
2022-04-29  6:00           ` David Gibson
2022-04-29 12:54             ` Jason Gunthorpe via iommu
2022-04-30 14:44               ` David Gibson
2022-03-18 17:27 ` [PATCH RFC 09/12] iommufd: Add a HW pagetable object Jason Gunthorpe via iommu
2022-03-18 17:27 ` [PATCH RFC 10/12] iommufd: Add kAPI toward external drivers Jason Gunthorpe via iommu
2022-03-23 18:10   ` Alex Williamson
2022-03-23 18:15     ` Jason Gunthorpe via iommu
2022-05-11 12:54   ` Yi Liu
2022-05-19  9:45   ` Yi Liu
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 via iommu
2022-03-23 22:51   ` Alex Williamson
2022-03-24  0:33     ` Jason Gunthorpe via iommu
2022-03-24  8:13       ` Eric Auger
2022-03-24 22:04       ` Alex Williamson
2022-03-24 23:11         ` Jason Gunthorpe via iommu
2022-03-25  3:10           ` Tian, Kevin
2022-03-25 11:24           ` Joao Martins
2022-04-28 14:53         ` David Gibson
2022-04-28 15:10           ` Jason Gunthorpe via iommu
2022-04-29  1:21             ` Tian, Kevin
2022-04-29  6:22               ` David Gibson
2022-04-29 12:50                 ` Jason Gunthorpe via iommu
2022-05-02  4:10                   ` David Gibson
2022-04-29  6:20             ` David Gibson
2022-04-29 12:48               ` Jason Gunthorpe via iommu
2022-05-02  7:30                 ` David Gibson
2022-05-05 19:07                   ` Jason Gunthorpe via iommu
2022-05-06  5:25                     ` David Gibson
2022-05-06 10:42                       ` Tian, Kevin
2022-05-09  3:36                         ` David Gibson
2022-05-06 12:48                       ` Jason Gunthorpe via iommu
2022-05-09  6:01                         ` David Gibson
2022-05-09 14:00                           ` Jason Gunthorpe via iommu
2022-05-10  7:12                             ` David Gibson
2022-05-10 19:00                               ` Jason Gunthorpe via iommu
2022-05-11  3:15                                 ` Tian, Kevin
2022-05-11 16:32                                   ` Jason Gunthorpe via iommu
2022-05-11 23:23                                     ` Tian, Kevin
2022-05-13  4:35                                   ` David Gibson
2022-05-11  4:40                                 ` David Gibson
2022-05-11  2:46                             ` Tian, Kevin
2022-05-23  6:02           ` Alexey Kardashevskiy
2022-05-24 13:25             ` Jason Gunthorpe via iommu
2022-05-25  1:39               ` David Gibson [this message]
2022-05-25  2:09               ` Alexey Kardashevskiy
2022-03-29  9:17     ` Yi Liu
2022-03-18 17:27 ` [PATCH RFC 12/12] iommufd: Add a selftest Jason Gunthorpe via iommu
2022-04-12 20:13 ` [PATCH RFC 00/12] IOMMUFD Generic interface Eric Auger
2022-04-12 20:22   ` Jason Gunthorpe via iommu
2022-04-12 20:50     ` Eric Auger
2022-04-14 10:56 ` Yi Liu

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