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Re: [Xen-devel] FLR support in xl tool stack

To: "Kay, Allen M" <allen.m.kay@xxxxxxxxx>
Subject: Re: [Xen-devel] FLR support in xl tool stack
From: Jean Guyader <jean.guyader@xxxxxxxxx>
Date: Fri, 28 Jan 2011 09:50:24 +0530
Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, Wilk <konrad.wilk@xxxxxxxxxx>, Jean Guyader <jean.guyader@xxxxxxxxxxxxx>, Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>, Thomas Horsten <thomas.horsten@xxxxxxxxxx>, Ross Philipson <Ross.Philipson@xxxxxxxxxx>
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On 28 January 2011 08:38, Kay, Allen M <allen.m.kay@xxxxxxxxx> wrote:
> In xm tool stack, there is a function called do_FLR() located in 
> python/xen/util/pci.py that takes care of issuing FLR to passthrough PCI 
> devices.  This function is responsible for looking at the device and figure 
> out the most appropriate way to reset the device (PCI/PCIe FLR, secondary bus 
> reset, etc...).
> In xl tool stack, I see there is a libxl_device_pci_reset() in 
> libxl/libxl_pci.c that suppose to do the similar thing.  It references 
> /sys/bus/pci/drivers/pciback/do_flr and tries to write something to it. 
>  However, pciback driver in pvops kernel does not seem to have this 
> do_flr functionality.
> Is this something being worked on but not checked in to pvops dom0 kernel yet?
> If not, I would prefer implementing all of the do_FLR() functionaility in 
> libxl and not to depend on pciback driver given it is not part of the 
> upstream kernel.  This will make using newer kernels such as 2.6.38 much 
> easier.
> Comments?

On the newest kernels (I don't know from which version), the reset
function has been moved under the pci device tree directly. So


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