From: Alex Williamson <alex.williamson@redhat.com>
To: Peter Xu <peterx@redhat.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Subject: Re: [PATCH 7/7] vfio/pci: Remove map-on-fault behavior
Date: Tue, 10 Aug 2021 15:45:12 -0600 [thread overview]
Message-ID: <20210810154512.5aa8eeb3.alex.williamson@redhat.com> (raw)
In-Reply-To: <YRLne7/S1euppJQr@t490s>
On Tue, 10 Aug 2021 16:54:19 -0400
Peter Xu <peterx@redhat.com> wrote:
> On Thu, Aug 05, 2021 at 11:08:21AM -0600, Alex Williamson wrote:
> > diff --git a/drivers/vfio/pci/vfio_pci_private.h b/drivers/vfio/pci/vfio_pci_private.h
> > index 0aa542fa1e26..9aedb78a4ae3 100644
> > --- a/drivers/vfio/pci/vfio_pci_private.h
> > +++ b/drivers/vfio/pci/vfio_pci_private.h
> > @@ -128,6 +128,7 @@ struct vfio_pci_device {
> > bool needs_reset;
> > bool nointx;
> > bool needs_pm_restore;
> > + bool zapped_bars;
>
> Would it be nicer to invert the meaning of "zapped_bars" and rename it to
> "memory_enabled"? Thanks,
I think this has it's own down sides, for example is this really less
confusing?:
if (!vdev->memory_enabled && __vfio_pci_memory_enabled(vdev))
Are you specifically trying to invert the polarity or just get away
from the name proposed here? We could use something like
"bars_unmapped", which would have the same polarity (OTOH,
"bars_mapped" suggests something to me about whether the user has
performed any mmaps of BARs).
I do wish there was a more elegant solution than an @var tracking this
state in general, but I haven't come up with such a solution yet.
Thanks,
Alex
next prev parent reply other threads:[~2021-08-10 21:45 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-05 17:06 [PATCH 0/7] vfio: device fd address space and vfio-pci mmap invalidation cleanup Alex Williamson
2021-08-05 17:07 ` [PATCH 1/7] vfio: Create vfio_fs_type with inode per device Alex Williamson
2021-08-10 8:43 ` Christoph Hellwig
2021-08-10 14:52 ` Alex Williamson
2021-08-10 14:57 ` Christoph Hellwig
2021-08-10 18:49 ` Peter Xu
2021-08-10 21:16 ` Alex Williamson
2021-08-10 22:18 ` Peter Xu
2021-08-05 17:07 ` [PATCH 2/7] vfio: Export unmap_mapping_range() wrapper Alex Williamson
2021-08-10 8:45 ` Christoph Hellwig
2021-08-10 18:56 ` Peter Xu
2021-08-05 17:07 ` [PATCH 3/7] vfio/pci: Use vfio_device_unmap_mapping_range() Alex Williamson
2021-08-06 1:04 ` Jason Gunthorpe
2021-08-06 20:17 ` Alex Williamson
2021-08-10 8:51 ` Christoph Hellwig
2021-08-10 11:57 ` Jason Gunthorpe
2021-08-10 12:55 ` Christoph Hellwig
2021-08-10 21:50 ` Alex Williamson
2021-08-11 11:57 ` Jason Gunthorpe
2021-08-10 8:53 ` Christoph Hellwig
2021-08-10 19:02 ` Peter Xu
2021-08-10 20:51 ` Alex Williamson
2021-08-10 18:48 ` Peter Xu
2021-08-10 19:59 ` Alex Williamson
2021-08-10 20:20 ` Peter Xu
2021-08-05 17:07 ` [PATCH 4/7] vfio,vfio-pci: Add vma to pfn callback Alex Williamson
2021-08-06 1:01 ` Jason Gunthorpe
2021-08-10 9:00 ` Christoph Hellwig
2021-08-10 9:00 ` Christoph Hellwig
2021-08-05 17:08 ` [PATCH 5/7] mm/interval_tree.c: Export vma interval tree iterators Alex Williamson
2021-08-05 17:08 ` [PATCH 6/7] vfio: Add vfio_device_io_remap_mapping_range() Alex Williamson
2021-08-10 9:04 ` Christoph Hellwig
2021-08-05 17:08 ` [PATCH 7/7] vfio/pci: Remove map-on-fault behavior Alex Williamson
2021-08-10 9:11 ` Christoph Hellwig
2021-08-10 15:04 ` Alex Williamson
2021-08-10 20:54 ` Peter Xu
2021-08-10 21:45 ` Alex Williamson [this message]
2021-08-10 22:27 ` Peter Xu
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