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xen-devel
RE: [Xen-devel] FLR support in xl tool stack
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To: |
Jean Guyader <jean.guyader@xxxxxxxxx>, "Kay, Allen M" <allen.m.kay@xxxxxxxxx> |
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Subject: |
RE: [Xen-devel] FLR support in xl tool stack |
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From: |
Ross Philipson <Ross.Philipson@xxxxxxxxxx> |
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Date: |
Fri, 28 Jan 2011 11:10:47 -0500 |
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Thomas, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>, Wilk <konrad.wilk@xxxxxxxxxx>, Jean Guyader <Jean.Guyader@xxxxxxxxxx>, Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>, Horsten <thomas.horsten@xxxxxxxxxx> |
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Fri, 28 Jan 2011 08:11:37 -0800 |
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[Xen-devel] FLR support in xl tool stack |
Yeah when I first implemented this in pciback is was looking for a common place
since the existing FLR logic was in the xend tool-stack (which we were not
using). Also folks on xen-devel had suggested it go in pciback at the time.
I am not familiar with what reset functionality is in pci in newer kernels
(there was not a lot in the .27 one) but a lot of what I put in pciback was
specific to resetting the Intel graphics device on GM45 and Q45 chipsets.
Thanks
Ross
-----Original Message-----
From: Jean Guyader [mailto:jean.guyader@xxxxxxxxx]
Sent: Thursday, January 27, 2011 11:20 PM
To: Kay, Allen M
Cc: xen-devel; Wilk; Stefano Stabellini; Jean Guyader; Ian Campbell; Thomas
Horsten; Ross Philipson
Subject: Re: [Xen-devel] FLR support in xl tool stack
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 2.6.32.27 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
/sys/bus/pci/device/<BDF>/reset.
Jean
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