From: Jason Gunthorpe <jgg@ziepe.ca>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
cohuck@redhat.com, peterx@redhat.com
Subject: Re: [PATCH 3/3] vfio-pci: Invalidate mmaps and block MMIO access on disabled memory
Date: Tue, 5 May 2020 15:36:29 -0300 [thread overview]
Message-ID: <20200505183629.GF26002@ziepe.ca> (raw)
In-Reply-To: <20200505111227.02ac9cee@w520.home>
On Tue, May 05, 2020 at 11:12:27AM -0600, Alex Williamson wrote:
>
> As noted in the comment, the fault handler can simply do:
>
> mutex_lock(&vdev->vma_lock);
> down_read(&vdev->memory_lock);
>
> This should be deadlock free now, so we can drop the retry handling
That does look like the right direction, because the memory_lock can
be done at the very end it means it doesn't need to be nested inside
mmap_sem
This is much cleaner!
Jason
prev parent reply other threads:[~2020-05-05 18:36 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-01 21:38 [PATCH 0/3] vfio-pci: Block user access to disabled device MMIO Alex Williamson
2020-05-01 21:39 ` [PATCH 1/3] vfio/type1: Support faulting PFNMAP vmas Alex Williamson
2020-05-01 23:50 ` Jason Gunthorpe
2020-05-04 14:06 ` Alex Williamson
2020-05-04 15:02 ` Jason Gunthorpe
2020-05-01 21:39 ` [PATCH 2/3] vfio-pci: Fault mmaps to enable vma tracking Alex Williamson
2020-05-01 23:25 ` Jason Gunthorpe
2020-05-04 14:20 ` Alex Williamson
2020-05-04 15:05 ` Jason Gunthorpe
2020-05-04 15:53 ` Alex Williamson
2020-05-01 21:39 ` [PATCH 3/3] vfio-pci: Invalidate mmaps and block MMIO access on disabled memory Alex Williamson
2020-05-01 23:48 ` Jason Gunthorpe
2020-05-04 18:26 ` Alex Williamson
2020-05-04 18:44 ` Jason Gunthorpe
2020-05-04 19:35 ` Alex Williamson
2020-05-04 20:01 ` Jason Gunthorpe
2020-05-05 17:12 ` Alex Williamson
2020-05-05 18:36 ` Jason Gunthorpe [this message]
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