From: David Hildenbrand <david@redhat.com>
To: Matthew Rosato <mjrosato@linux.ibm.com>,
Jason Gunthorpe <jgg@nvidia.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>,
Lorenzo Stoakes <lstoakes@gmail.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Jens Axboe <axboe@kernel.dk>,
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Peter Xu <peterx@redhat.com>
Subject: Re: [PATCH v6 3/3] mm/gup: disallow FOLL_LONGTERM GUP-fast writing to file-backed mappings
Date: Tue, 2 May 2023 17:09:06 +0200 [thread overview]
Message-ID: <1f3231c0-34b2-1e78-0bf0-f32d5b67811d@redhat.com> (raw)
In-Reply-To: <1d4c9258-9423-7411-e722-8f6865b18886@linux.ibm.com>
On 02.05.23 15:56, Matthew Rosato wrote:
> On 5/2/23 9:50 AM, Jason Gunthorpe wrote:
>> On Tue, May 02, 2023 at 03:47:43PM +0200, David Hildenbrand wrote:
>>>> Eventually we want to implement a mechanism where we can dynamically pin in response to RPCIT.
>>>
>>> Okay, so IIRC we'll fail starting the domain early, that's good. And if we
>>> pin all guest memory (instead of small pieces dynamically), there is little
>>> existing use for file-backed RAM in such zPCI configurations (because memory
>>> cannot be reclaimed either way if it's all pinned), so likely there are no
>>> real existing users.
>>
>> Right, this is VFIO, the physical HW can't tolerate not having pinned
>> memory, so something somewhere is always pinning it.
>
> I might have mis-explained above.
>
> With iommufd nesting, we will pin everything upfront as a starting point.
>
> The current usage of vfio type1 iommu for s390 does not pin the entirety of guest memory upfront, it happens as guest RPCITs occur / type1 mappings are made.
... so, after the domain started successfully on the libvirt/QEMU side ? :/
It would be great to confirm that. There might be a BUG in patch #2 (see
my reply to patch #2) that might not allow you to reproduce it right now.
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2023-05-02 15:09 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-01 23:11 [PATCH v6 0/3] mm/gup: disallow GUP writing to file-backed mappings by default Lorenzo Stoakes
2023-05-01 23:11 ` [PATCH v6 1/3] mm/mmap: separate writenotify and dirty tracking logic Lorenzo Stoakes
2023-05-01 23:11 ` [PATCH v6 2/3] mm/gup: disallow FOLL_LONGTERM GUP-nonfast writing to file-backed mappings Lorenzo Stoakes
2023-05-02 15:04 ` David Hildenbrand
2023-05-02 15:17 ` Lorenzo Stoakes
2023-05-01 23:11 ` [PATCH v6 3/3] mm/gup: disallow FOLL_LONGTERM GUP-fast " Lorenzo Stoakes
2023-05-01 23:42 ` John Hubbard
2023-05-02 11:13 ` Peter Zijlstra
2023-05-02 11:23 ` Jan Kara
2023-05-02 11:25 ` Lorenzo Stoakes
2023-05-02 11:28 ` Lorenzo Stoakes
2023-05-02 12:08 ` Peter Zijlstra
2023-05-02 12:27 ` Lorenzo Stoakes
2023-05-02 12:40 ` Peter Zijlstra
2023-05-02 12:47 ` David Hildenbrand
2023-05-02 12:52 ` Lorenzo Stoakes
2023-05-02 12:53 ` David Hildenbrand
2023-05-02 13:30 ` Paul E. McKenney
2023-05-02 11:20 ` Jan Kara
2023-05-02 12:46 ` Christian Borntraeger
2023-05-02 12:54 ` Lorenzo Stoakes
2023-05-02 13:02 ` Jason Gunthorpe
2023-05-02 13:04 ` Christian Borntraeger
2023-05-02 13:10 ` Jason Gunthorpe
2023-05-02 13:28 ` David Hildenbrand
2023-05-02 13:36 ` Jason Gunthorpe
2023-05-02 13:39 ` David Hildenbrand
2023-05-02 13:43 ` Matthew Rosato
2023-05-02 13:47 ` David Hildenbrand
2023-05-02 13:50 ` Jason Gunthorpe
2023-05-02 13:56 ` Matthew Rosato
2023-05-02 15:09 ` David Hildenbrand [this message]
2023-05-02 15:19 ` Lorenzo Stoakes
2023-05-02 15:20 ` Matthew Rosato
2023-05-02 13:57 ` David Hildenbrand
2023-05-02 14:04 ` Jason Gunthorpe
2023-05-02 14:15 ` David Hildenbrand
2023-05-02 14:54 ` Matthew Rosato
2023-05-02 15:20 ` Jason Gunthorpe
2023-05-02 15:32 ` Peter Xu
2023-05-02 15:36 ` Jason Gunthorpe
2023-05-02 15:45 ` David Hildenbrand
2023-05-02 16:06 ` Jason Gunthorpe
2023-05-02 16:12 ` David Hildenbrand
2023-05-02 16:19 ` Jason Gunthorpe
2023-05-02 16:32 ` David Hildenbrand
2023-05-02 17:46 ` Jason Gunthorpe
2023-05-02 17:59 ` Matthew Rosato
2023-05-02 18:09 ` Jason Gunthorpe
2023-05-02 19:23 ` David Hildenbrand
2023-05-02 13:38 ` Matthew Rosato
2023-05-02 13:35 ` Matthew Rosato
2023-05-02 14:57 ` David Hildenbrand
2023-05-02 15:19 ` Matthew Rosato
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