From: will.deacon@arm.com (Will Deacon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 2/4] PCI: pci-host-generic: Fix lookup of linux,pci-probe-only property
Date: Mon, 17 Aug 2015 10:01:32 +0100 [thread overview]
Message-ID: <20150817090132.GC1688@arm.com> (raw)
In-Reply-To: <CAErSpo5abs2Qj25Bs+JVg87ve346f_RVz7jhNwqdv856+WvXQA@mail.gmail.com>
On Fri, Aug 14, 2015 at 09:26:21PM +0100, Bjorn Helgaas wrote:
> On Fri, Aug 14, 2015 at 11:43 AM, Will Deacon <will.deacon@arm.com> wrote:
> > On Fri, Aug 14, 2015 at 05:40:51PM +0100, Bjorn Helgaas wrote:
> >> Do we need support for pci-probe-only in pci-host-generic at all?
> >> You're removing the use in amd-overdrive.dts, and there are no other
> >> DTs in the kernel tree that mention it.
> >>
> >> If we can live without it, that would be nice. It seems like a relic from
> >> days when we couldn't reliably assign resources. (I'm not saying we can do
> >> that reliably even today, but I'd rather make it reliable than turn it
> >> off.)
> >
> > Kvmtool certainly uses it (and generates its own DT, hence why you don't
> > see it in mainline). Not sure about qemu, though.
>
> Do you know why kvmtool wants probe-only? Would something break if we
> didn't support probe-only? I guess we'd be looking for a case where
> Linux assigns resources and that assignment doesn't work with kvmtool?
It's basically because the BARs aren't writable other than to find the
region size. It could fixed with a bit of pain, but it doesn't help older
kvmtools that do work with mainline today.
Will
next prev parent reply other threads:[~2015-08-17 9:01 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-14 16:19 [PATCH v2 0/4] PCI: arm64/powerpc: Fix parsing of linux, pci-probe-only Marc Zyngier
2015-08-14 16:19 ` [PATCH v2 1/4] of/pci: Add of_pci_check_probe_only to parse "linux, pci-probe-only" Marc Zyngier
2015-08-14 21:08 ` Rob Herring
2015-09-02 22:23 ` [PATCH v2 1/4] of/pci: Add of_pci_check_probe_only to parse "linux,pci-probe-only" Bjorn Helgaas
2015-09-03 8:18 ` [PATCH v2 1/4] of/pci: Add of_pci_check_probe_only to parse "linux, pci-probe-only" Marc Zyngier
2015-08-14 16:19 ` [PATCH v2 2/4] PCI: pci-host-generic: Fix lookup of linux, pci-probe-only property Marc Zyngier
2015-08-14 16:40 ` [PATCH v2 2/4] PCI: pci-host-generic: Fix lookup of linux,pci-probe-only property Bjorn Helgaas
2015-08-14 16:43 ` Will Deacon
2015-08-14 16:50 ` [PATCH v2 2/4] PCI: pci-host-generic: Fix lookup of linux, pci-probe-only property Alexander Graf
2015-08-14 20:26 ` [PATCH v2 2/4] PCI: pci-host-generic: Fix lookup of linux,pci-probe-only property Bjorn Helgaas
2015-08-17 9:01 ` Will Deacon [this message]
2015-08-14 16:45 ` Will Deacon
2015-08-14 16:19 ` [PATCH v2 3/4] powerpc: PCI: Fix lookup of linux, pci-probe-only property Marc Zyngier
2015-08-14 16:19 ` [PATCH v2 4/4] arm64: dts: Drop linux, pci-probe-only from the Seattle DTS Marc Zyngier
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