From: Paolo Bonzini <pbonzini@redhat.com>
To: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: "DRI Development" <dri-devel@lists.freedesktop.org>,
LKML <linux-kernel@vger.kernel.org>,
"KVM list" <kvm@vger.kernel.org>, "Linux MM" <linux-mm@kvack.org>,
"Linux ARM" <linux-arm-kernel@lists.infradead.org>,
linux-samsung-soc <linux-samsung-soc@vger.kernel.org>,
"open list:DMA BUFFER SHARING FRAMEWORK"
<linux-media@vger.kernel.org>,
"Daniel Vetter" <daniel.vetter@intel.com>,
"Christoph Hellwig" <hch@infradead.org>,
"Jason Gunthorpe" <jgg@ziepe.ca>,
"Kees Cook" <keescook@chromium.org>,
"Dan Williams" <dan.j.williams@intel.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"John Hubbard" <jhubbard@nvidia.com>,
"Jérôme Glisse" <jglisse@redhat.com>, "Jan Kara" <jack@suse.cz>
Subject: Re: [PATCH v6 16/17] RFC: kvm: pass kvm argument to follow_pfn callsites
Date: Fri, 20 Nov 2020 16:55:00 +0100 [thread overview]
Message-ID: <3eca2dde-c78b-3eb4-8f61-7fdf16573419@redhat.com> (raw)
In-Reply-To: <CAKMK7uHDrPDcsWyMgFgjf0+hdebSUT4hX5hKR=CnTH=soLU-Kg@mail.gmail.com>
On 20/11/20 16:44, Daniel Vetter wrote:
>> It's a bit of a pity, it's making an API more complex (the point of
>> gfn_to_pfn_memslot vs gfn_to_pfn is exactly that you don't need a
>> "struct kvm*" and it's clear that you've already done the lookup into
>> that struct kvm.
>
> Yeah I noticed that, I think pushing the lookups down should work, but
> that's a fairly large-scale change. I didn't want to do that for the
> RFC since it would distract from the actual change/goal.
> -Daniel
Pushing the lookups down would be worse code and possibly introduce
TOC/TOU races, so better avoid that. Your patch is fine. :)
Paolo
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: linux-samsung-soc <linux-samsung-soc@vger.kernel.org>,
"Jan Kara" <jack@suse.cz>, "Kees Cook" <keescook@chromium.org>,
"KVM list" <kvm@vger.kernel.org>,
"Jason Gunthorpe" <jgg@ziepe.ca>,
"John Hubbard" <jhubbard@nvidia.com>,
LKML <linux-kernel@vger.kernel.org>,
"DRI Development" <dri-devel@lists.freedesktop.org>,
"Christoph Hellwig" <hch@infradead.org>,
"Linux MM" <linux-mm@kvack.org>,
"Jérôme Glisse" <jglisse@redhat.com>,
"Daniel Vetter" <daniel.vetter@intel.com>,
"Dan Williams" <dan.j.williams@intel.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Linux ARM" <linux-arm-kernel@lists.infradead.org>,
"open list:DMA BUFFER SHARING FRAMEWORK"
<linux-media@vger.kernel.org>
Subject: Re: [PATCH v6 16/17] RFC: kvm: pass kvm argument to follow_pfn callsites
Date: Fri, 20 Nov 2020 16:55:00 +0100 [thread overview]
Message-ID: <3eca2dde-c78b-3eb4-8f61-7fdf16573419@redhat.com> (raw)
In-Reply-To: <CAKMK7uHDrPDcsWyMgFgjf0+hdebSUT4hX5hKR=CnTH=soLU-Kg@mail.gmail.com>
On 20/11/20 16:44, Daniel Vetter wrote:
>> It's a bit of a pity, it's making an API more complex (the point of
>> gfn_to_pfn_memslot vs gfn_to_pfn is exactly that you don't need a
>> "struct kvm*" and it's clear that you've already done the lookup into
>> that struct kvm.
>
> Yeah I noticed that, I think pushing the lookups down should work, but
> that's a fairly large-scale change. I didn't want to do that for the
> RFC since it would distract from the actual change/goal.
> -Daniel
Pushing the lookups down would be worse code and possibly introduce
TOC/TOU races, so better avoid that. Your patch is fine. :)
Paolo
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: linux-samsung-soc <linux-samsung-soc@vger.kernel.org>,
"Jan Kara" <jack@suse.cz>, "Kees Cook" <keescook@chromium.org>,
"KVM list" <kvm@vger.kernel.org>,
"Jason Gunthorpe" <jgg@ziepe.ca>,
"John Hubbard" <jhubbard@nvidia.com>,
LKML <linux-kernel@vger.kernel.org>,
"DRI Development" <dri-devel@lists.freedesktop.org>,
"Christoph Hellwig" <hch@infradead.org>,
"Linux MM" <linux-mm@kvack.org>,
"Jérôme Glisse" <jglisse@redhat.com>,
"Daniel Vetter" <daniel.vetter@intel.com>,
"Dan Williams" <dan.j.williams@intel.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Linux ARM" <linux-arm-kernel@lists.infradead.org>,
"open list:DMA BUFFER SHARING FRAMEWORK"
<linux-media@vger.kernel.org>
Subject: Re: [PATCH v6 16/17] RFC: kvm: pass kvm argument to follow_pfn callsites
Date: Fri, 20 Nov 2020 16:55:00 +0100 [thread overview]
Message-ID: <3eca2dde-c78b-3eb4-8f61-7fdf16573419@redhat.com> (raw)
In-Reply-To: <CAKMK7uHDrPDcsWyMgFgjf0+hdebSUT4hX5hKR=CnTH=soLU-Kg@mail.gmail.com>
On 20/11/20 16:44, Daniel Vetter wrote:
>> It's a bit of a pity, it's making an API more complex (the point of
>> gfn_to_pfn_memslot vs gfn_to_pfn is exactly that you don't need a
>> "struct kvm*" and it's clear that you've already done the lookup into
>> that struct kvm.
>
> Yeah I noticed that, I think pushing the lookups down should work, but
> that's a fairly large-scale change. I didn't want to do that for the
> RFC since it would distract from the actual change/goal.
> -Daniel
Pushing the lookups down would be worse code and possibly introduce
TOC/TOU races, so better avoid that. Your patch is fine. :)
Paolo
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2020-11-20 15:55 UTC|newest]
Thread overview: 117+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-19 14:41 [PATCH v6 00/17] follow_pfn and other iomap races Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 01/17] drm/exynos: Stop using frame_vector helpers Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 02/17] drm/exynos: Use FOLL_LONGTERM for g2d cmdlists Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 03/17] misc/habana: Stop using frame_vector helpers Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-21 12:47 ` Oded Gabbay
2020-11-21 12:47 ` Oded Gabbay
2020-11-21 12:47 ` Oded Gabbay
2020-11-19 14:41 ` [PATCH v6 04/17] misc/habana: Use FOLL_LONGTERM for userptr Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-21 10:15 ` Oded Gabbay
2020-11-21 10:15 ` Oded Gabbay
2020-11-21 10:15 ` Oded Gabbay
2020-11-19 14:41 ` [PATCH v6 05/17] mm/frame-vector: Use FOLL_LONGTERM Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 06/17] media: videobuf2: Move frame_vector into media subsystem Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-20 8:07 ` Hans Verkuil
2020-11-20 8:07 ` Hans Verkuil
2020-11-20 8:07 ` Hans Verkuil
2020-11-19 14:41 ` [PATCH v6 07/17] mm: Close race in generic_access_phys Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 08/17] mm: Add unsafe_follow_pfn Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 09/17] media/videbuf1|2: Mark follow_pfn usage as unsafe Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-20 8:06 ` Hans Verkuil
2020-11-20 8:06 ` Hans Verkuil
2020-11-20 8:06 ` Hans Verkuil
2020-11-20 8:28 ` Hans Verkuil
2020-11-20 8:28 ` Hans Verkuil
2020-11-20 8:28 ` Hans Verkuil
2020-11-20 8:32 ` Tomasz Figa
2020-11-20 8:32 ` Tomasz Figa
2020-11-20 8:32 ` Tomasz Figa
2020-11-20 9:18 ` Daniel Vetter
2020-11-20 9:18 ` Daniel Vetter
2020-11-20 9:18 ` Daniel Vetter
2020-11-20 10:38 ` Hans Verkuil
2020-11-20 10:38 ` Hans Verkuil
2020-11-20 10:38 ` Hans Verkuil
2020-11-20 10:51 ` Daniel Vetter
2020-11-20 10:51 ` Daniel Vetter
2020-11-20 10:51 ` Daniel Vetter
2020-11-20 12:08 ` Hans Verkuil
2020-11-20 12:08 ` Hans Verkuil
2020-11-20 12:08 ` Hans Verkuil
2020-11-20 12:23 ` Tomasz Figa
2020-11-20 12:23 ` Tomasz Figa
2020-11-20 12:23 ` Tomasz Figa
2020-11-24 14:16 ` Daniel Vetter
2020-11-24 14:16 ` Daniel Vetter
2020-11-24 14:16 ` Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 10/17] vfio/type1: Mark follow_pfn " Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 11/17] PCI: Obey iomem restrictions for procfs mmap Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 12/17] /dev/mem: Only set filp->f_mapping Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 13/17] resource: Move devmem revoke code to resource framework Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 14/17] sysfs: Support zapping of binary attr mmaps Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 15/17] PCI: Revoke mappings like devmem Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 16/17] RFC: kvm: pass kvm argument to follow_pfn callsites Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-20 15:33 ` Paolo Bonzini
2020-11-20 15:33 ` Paolo Bonzini
2020-11-20 15:33 ` Paolo Bonzini
2020-11-20 15:44 ` Daniel Vetter
2020-11-20 15:44 ` Daniel Vetter
2020-11-20 15:44 ` Daniel Vetter
2020-11-20 15:55 ` Paolo Bonzini [this message]
2020-11-20 15:55 ` Paolo Bonzini
2020-11-20 15:55 ` Paolo Bonzini
2020-11-19 14:41 ` [PATCH v6 17/17] RFC: mm: add mmu_notifier argument to follow_pfn Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-19 14:41 ` Daniel Vetter
2020-11-20 18:30 ` Jason Gunthorpe
2020-11-20 18:30 ` Jason Gunthorpe
2020-11-20 18:30 ` Jason Gunthorpe
2020-11-24 14:28 ` Daniel Vetter
2020-11-24 14:28 ` Daniel Vetter
2020-11-24 14:28 ` Daniel Vetter
2020-11-24 15:55 ` Jason Gunthorpe
2020-11-24 15:55 ` Jason Gunthorpe
2020-11-24 15:55 ` Jason Gunthorpe
2020-11-25 9:00 ` Daniel Vetter
2020-11-25 9:00 ` Daniel Vetter
2020-11-25 9:00 ` Daniel Vetter
2020-11-27 13:12 ` [PATCH v6 00/17] follow_pfn and other iomap races Jason Gunthorpe
2020-11-27 13:12 ` Jason Gunthorpe
2020-11-27 13:12 ` Jason Gunthorpe
2020-11-27 15:36 ` Daniel Vetter
2020-11-27 15:36 ` Daniel Vetter
2020-11-27 15:36 ` Daniel Vetter
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=3eca2dde-c78b-3eb4-8f61-7fdf16573419@redhat.com \
--to=pbonzini@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=dan.j.williams@intel.com \
--cc=daniel.vetter@ffwll.ch \
--cc=daniel.vetter@intel.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=hch@infradead.org \
--cc=jack@suse.cz \
--cc=jgg@ziepe.ca \
--cc=jglisse@redhat.com \
--cc=jhubbard@nvidia.com \
--cc=keescook@chromium.org \
--cc=kvm@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-media@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux-samsung-soc@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.