From: "Wang, Liang-min" <liang-min.wang@intel.com>
To: David Woodhouse <dwmw2@infradead.org>,
Christoph Hellwig <hch@infradead.org>,
"Duyck, Alexander H" <alexander.h.duyck@intel.com>,
"O'riordain, Seosamh" <seosamh.oriordain@intel.com>
Cc: "alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Kirsher, Jeffrey T" <jeffrey.t.kirsher@intel.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"bhelgaas@google.com" <bhelgaas@google.com>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>
Subject: RE: [PATCH] Enable SR-IOV instantiation through /sys file
Date: Tue, 31 Oct 2017 12:55:20 +0000 [thread overview]
Message-ID: <B6CB929FEBC10D4FAC4BCA7EF2298E259DB5BB50@FMSMSX110.amr.corp.intel.com> (raw)
In-Reply-To: <1509367141.11641.51.camel@infradead.org>
> -----Original Message-----
> From: David Woodhouse [mailto:dwmw2@infradead.org]
> Sent: Monday, October 30, 2017 8:39 AM
> To: Christoph Hellwig <hch@infradead.org>; Duyck, Alexander H
> <alexander.h.duyck@intel.com>
> Cc: Wang, Liang-min <liang-min.wang@intel.com>;
> alex.williamson@redhat.com; linux-kernel@vger.kernel.org; Kirsher, Jeffrey T
> <jeffrey.t.kirsher@intel.com>; kvm@vger.kernel.org; bhelgaas@google.com;
> linux-pci@vger.kernel.org
> Subject: Re: [PATCH] Enable SR-IOV instantiation through /sys file
>
> On Sat, 2017-10-28 at 23:16 -0700, Christoph Hellwig wrote:
> > On Fri, Oct 27, 2017 at 11:20:41PM +0000, Duyck, Alexander H wrote:
> > >
> > > I don't see this so much as a security problem per-se. It all depends
> > > on the hardware setup. If I recall correctly, there are devices where
> > > the PF function doesn't really do much other than act as a bit more
> > > heavy-weight VF, and the actual logic is handled by a firmware engine
> > > on the device.
> >
> > Can you cite an example? While those surely could exist in theory,
> > I can't think of a practical example.
>
> I have them, which is why I'm patching the UIO driver to allow num_vfs
> to be set. I don't even want to *use* the UIO driver for any purpose
> except to make that appear in sysfs. It's all handled in the device.
>
> (I think we might be able to just give the PF out to a guest as if it
> were just another VF, but I don't think we actually *do* that right
> now).
Under UEFI secure boot environment, kernel puts restrictions on UIO and its derivatives.
So, user-space function/driver based upon UIO is no longer working under UEFI secure
boot environment. The next viable option is vfio-pci, hence this patch in parallel with
UIO work.
next prev parent reply other threads:[~2017-10-31 12:55 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-24 20:04 [PATCH] Enable SR-IOV instantiation through /sys file Jeff Kirsher
2017-10-24 21:43 ` Alex Williamson
2017-10-24 21:49 ` Wang, Liang-min
2017-10-24 22:06 ` Alex Williamson
2017-10-24 22:29 ` Wang, Liang-min
2017-10-25 8:39 ` Alex Williamson
2017-10-27 21:50 ` Wang, Liang-min
2017-10-27 22:19 ` Alex Williamson
2017-10-27 22:30 ` Wang, Liang-min
2017-10-27 23:20 ` Duyck, Alexander H
2017-10-29 6:16 ` Christoph Hellwig
2017-10-29 21:12 ` Alexander Duyck
2017-10-30 12:39 ` David Woodhouse
2017-10-31 12:55 ` Wang, Liang-min [this message]
2017-11-06 23:27 ` Alex Williamson
2017-11-06 23:47 ` Alexander Duyck
2017-11-07 16:59 ` Alex Williamson
2017-11-06 19:55 ` Bjorn Helgaas
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