linux-kernel - Re: [PATCH 0/5] Fixes, non-PCI-2.3 support, EOI enhancements

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Message-Id: <201011011422.01165.pugs@cisco.com>
Date:	Mon, 1 Nov 2010 14:22:00 -0700
From:	Tom Lyon <pugs@...co.com>
To:	Alex Williamson <alex.williamson@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	kvm@...r.kernel.org, avi@...hat.com, chrisw@...hat.com,
	mst@...hat.com
Subject: Re: [PATCH 0/5] Fixes, non-PCI-2.3 support, EOI enhancements

I've applied all your patches. Thanks!

On Saturday, October 30, 2010 09:58:55 am Alex Williamson wrote:
> Hi Tom,
> 
> I've updated some patches I've been working on to v5 and wanted to
> see what you think.  I also found a couple minor bugs, fixed in this
> series.
> 
> The main idea is that since the VFIO interface defines that the INTx
> interrupt is disabled when it fires, we should provide an interface
> to re-enable it.  We currently have to do a read-modify-write to PCI
> config space, requring two ioctls.  I introduce an ioctl to do this
> for us.  An important aspect of this is that now we can support
> non-PCI-2.3 devices since re-enabling the interrupt is abstracted
> (with the same caveat as current KVM device assignment, that they
> must get an exclusive interrupt).  The real trick though is that we
> can then also create an irqfd-like mechanism to trigger re-enabling
> interrupts from and eventfd.  This allows qemu to do all the setup
> for connecting interrupts from VFIO into KVM and EOIs from KVM to
> VFIO, then lets userspace get completely out of the way.
> 
> Hope you like it.  Thanks,
> 
> Alex
> ---
> 
> Alex Williamson (5):
>       vfio: Add a new ioctl to support EOI via eventfd
>       vfio: Add support for non-PCI 2.3 compliant devices
>       vfio: Add ioctl to re-enable interrupts
>       vfio: Fix requested regions
>       vfio: Fix the ROM mask
> 
> 
>  drivers/vfio/vfio_intrs.c      |  254
> +++++++++++++++++++++++++++++++++++++--- drivers/vfio/vfio_main.c       | 
>  37 +++++-
>  drivers/vfio/vfio_pci_config.c |    2
>  drivers/vfio/vfio_rdwr.c       |    4 -
>  include/linux/vfio.h           |   14 ++
>  5 files changed, 279 insertions(+), 32 deletions(-)
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