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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
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

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Thread overview: 39+ 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 ` [PATCH v6 01/17] drm/exynos: Stop using frame_vector helpers 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 ` [PATCH v6 03/17] misc/habana: Stop using frame_vector helpers Daniel Vetter
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
2020-11-21 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 ` [PATCH v6 06/17] media: videobuf2: Move frame_vector into media subsystem Daniel Vetter
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 ` [PATCH v6 08/17] mm: Add unsafe_follow_pfn Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 09/17] media/videbuf1|2: Mark follow_pfn usage as unsafe Daniel Vetter
2020-11-20  8:06   ` Hans Verkuil
2020-11-20  8:28     ` Hans Verkuil
2020-11-20  8:32       ` Tomasz Figa
2020-11-20  9:18       ` Daniel Vetter
2020-11-20 10:38         ` Hans Verkuil
2020-11-20 10:51           ` Daniel Vetter
2020-11-20 12:08             ` Hans Verkuil
2020-11-20 12:23               ` Tomasz Figa
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 ` [PATCH v6 11/17] PCI: Obey iomem restrictions for procfs mmap 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 ` [PATCH v6 13/17] resource: Move devmem revoke code to resource framework 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 ` [PATCH v6 15/17] PCI: Revoke mappings like devmem Daniel Vetter
2020-11-19 14:41 ` [PATCH v6 16/17] RFC: kvm: pass kvm argument to follow_pfn callsites Daniel Vetter
2020-11-20 15:33   ` Paolo Bonzini
2020-11-20 15:44     ` Daniel Vetter
2020-11-20 15:55       ` Paolo Bonzini [this message]
2020-11-19 14:41 ` [PATCH v6 17/17] RFC: mm: add mmu_notifier argument to follow_pfn Daniel Vetter
2020-11-20 18:30   ` Jason Gunthorpe
2020-11-24 14:28     ` Daniel Vetter
2020-11-24 15:55       ` Jason Gunthorpe
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 15:36   ` Daniel Vetter

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