Re: [Xen-devel] [PATCH V3 2/2] Xen/PCIback: Implement PCI flr/slot/bus reset with 'reset' SysFS attribute

From: "Pasi Kärkkäinen" <pasik@iki.fi>
To: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: "Juergen Gross" <jgross@suse.com>,
	"Konrad Rzeszutek Wilk" <konrad.wilk@oracle.com>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"George Dunlap" <George.Dunlap@citrix.com>,
	"Jan Beulich" <JBeulich@suse.com>,
	"bhelgaas@google.com" <bhelgaas@google.com>,
	xen-devel <xen-devel@lists.xenproject.org>,
	"Håkon Alstadheim" <hakon@alstadheim.priv.no>,
	"Roger Pau Monné" <roger.pau@citrix.com>
Subject: Re: [Xen-devel] [PATCH V3 2/2] Xen/PCIback: Implement PCI flr/slot/bus reset with 'reset' SysFS attribute
Date: Tue, 27 Aug 2019 00:05:47 +0300	[thread overview]
Message-ID: <20190826210547.GE2840@reaktio.net> (raw)
In-Reply-To: <f6b8e055-7afc-b4de-af88-425d799dcd28@oracle.com>

Hi,

On Mon, Oct 08, 2018 at 10:32:45AM -0400, Boris Ostrovsky wrote:
> On 10/3/18 11:51 AM, Pasi Kärkkäinen wrote:
> > On Wed, Sep 19, 2018 at 11:05:26AM +0200, Roger Pau Monné wrote:
> >> On Tue, Sep 18, 2018 at 02:09:53PM -0400, Boris Ostrovsky wrote:
> >>> On 9/18/18 5:32 AM, George Dunlap wrote:
> >>>>> On Sep 18, 2018, at 8:15 AM, Pasi Kärkkäinen <pasik@iki.fi> wrote:
> >>>>>
> >>>>> Hi,
> >>>>>
> >>>>> On Mon, Sep 17, 2018 at 02:06:02PM -0400, Boris Ostrovsky wrote:
> >>>>>> What about the toolstack changes? Have they been accepted? I vaguely
> >>>>>> recall there was a discussion about those changes but don't remember how
> >>>>>> it ended.
> >>>>>>
> >>>>> I don't think toolstack/libxl patch has been applied yet either.
> >>>>>
> >>>>>
> >>>>> "[PATCH V1 0/1] Xen/Tools: PCI reset using 'reset' SysFS attribute":
> >>>>> https://lists.xen.org/archives/html/xen-devel/2017-12/msg00664.html
> >>>>>
> >>>>> "[PATCH V1 1/1] Xen/libxl: Perform PCI reset using 'reset' SysFS attribute":
> >>>>> https://lists.xen.org/archives/html/xen-devel/2017-12/msg00663.html
> >>>
> >>> Will this patch work for *BSD? Roger?
> >> At least FreeBSD don't support pci-passthrough, so none of this works
> >> ATM. There's no sysfs on BSD, so much of what's in libxl_pci.c will
> >> have to be moved to libxl_linux.c when BSD support is added.
> >>
> > Ok. That sounds like it's OK for the initial pci 'reset' implementation in xl/libxl to be linux-only.. 
> >
> 
> Are these two patches still needed? ISTR they were  written originally
> to deal with guest trying to use device that was previously assigned to
> another guest. But pcistub_put_pci_dev() calls
> __pci_reset_function_locked() which first tries FLR, and it looks like
> it was added relatively recently.
> 

Replying to an old thread.. I only now realized I forgot to reply to this message earlier.

afaik these patches are still needed. Håkon (CC'd) wrote to me in private that
he gets a (dom0) Linux kernel crash if he doesn't have these patches applied.

Here are the links to both the linux kernel and libxl patches:

"[Xen-devel] [PATCH V3 0/2] Xen/PCIback: PCI reset using 'reset' SysFS attribute":
https://lists.xen.org/archives/html/xen-devel/2017-12/msg00659.html

[Note that PATCH V3 1/2 "Drivers/PCI: Export pcie_has_flr() interface" is already applied in upstream linux kernel, so it's not needed anymore]

"[Xen-devel] [PATCH V3 2/2] Xen/PCIback: Implement PCI flr/slot/bus reset with 'reset' SysFS attribute":
https://lists.xen.org/archives/html/xen-devel/2017-12/msg00661.html

"[Xen-devel] [PATCH V1 0/1] Xen/Tools: PCI reset using 'reset' SysFS attribute":
https://lists.xen.org/archives/html/xen-devel/2017-12/msg00664.html

"[Xen-devel] [PATCH V1 1/1] Xen/libxl: Perform PCI reset using 'reset' SysFS attribute":
https://lists.xen.org/archives/html/xen-devel/2017-12/msg00663.html

> 
> -boris

Thanks,

-- Pasi

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