linux-kernel - Re: [PATCH v2 0/2] Store and load PCI device saved state across function resets

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Message-ID: <4DAE970A.50603@redhat.com>
Date:	Wed, 20 Apr 2011 11:19:22 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Alex Williamson <alex.williamson@...hat.com>
CC:	linux-pci@...r.kernel.org, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, jan.kiszka@...mens.com,
	jbarnes@...tuousgeek.org
Subject: Re: [PATCH v2 0/2] Store and load PCI device saved state across function
 resets

On 04/19/2011 11:12 PM, Alex Williamson wrote:
> v1 ->  v2:
>    Make the pointer passed around less opaque for type safety.
>
> Bug https://bugs.launchpad.net/qemu/+bug/754591 is caused because
> the KVM module attempts to do a pci_save_state() before assigning
> the device to a VM, expecting that the saved state will remain
> valid until we release the device.  This is in conflict with our
> need to reset devices using PCI sysfs during a VM reset to
> quiesce the device.  Any calls to pci_reset_function() will
> overwrite the device saved stated prior to reset, and reload and
> invalidate the state after.  KVM then ends up trying to restore
> the state, but it's already invalid, so the device ends up with
> reset values.
>
> This series adds a mechanism to pull the saved state off the
> struct pci_dev and reload it later.  Thanks,

Based on the sizes of the patches, this should go in via the pci tree.

-- 
error compiling committee.c: too many arguments to function

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