From: "Michael S. Tsirkin" <mst@redhat.com>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: QEMU Developers <qemu-devel@nongnu.org>,
Alexey Kardashevskiy <aik@ozlabs.ru>,
Alexander Graf <agraf@suse.de>,
Michael Roth <mdroth@linux.vnet.ibm.com>,
Mike Day <ncmike@ncultra.org>,
"qemu-ppc@nongnu.org" <qemu-ppc@nongnu.org>,
tyreld@linux.vnet.ibm.com, nfont@linux.vnet.ibm.com
Subject: Re: [Qemu-devel] [PATCH 08/12] pci: allow 0 address for PCI IO regions
Date: Thu, 28 Aug 2014 23:46:21 +0200 [thread overview]
Message-ID: <20140828214621.GA18917@redhat.com> (raw)
In-Reply-To: <CAFEAcA-WRpoNHPxD1se=zOUPiiGr0xPnDcvGCej51qw+4k=FSQ@mail.gmail.com>
On Thu, Aug 28, 2014 at 10:33:02PM +0100, Peter Maydell wrote:
> On 28 August 2014 22:21, Michael Roth <mdroth@linux.vnet.ibm.com> wrote:
> > But I guess there's still a separate issue, where there's a high liklihood that
> > a 0 address would conflict with some hard-wired IO address? Wouldn't this be a
> > guest bug though?
Real hardware behaves in a specific way.
the problem is we don't always emulate it properly, and PCI
has some work arounds for that.
> Even if it's a guest bug, we should act like the hardware does
> if the guest does this. If that differs between PCI controllers
> then we need a flag so the host controller model can select
> the required behaviour. (The versatile PB PCI controller we
> model does have "address 0 is valid", and we'd need to have
> this working if we implemented DMA accesses properly.)
>
> -- PMM
Exactly.
Actually, I forgot that I might have already fixed it for PC:
83d08f2673504a299194dcac1657a13754b5932a
pc: map PCI address space as catchall region for not mapped addresses
But need to go back and re-check other systems.
--
MST
next prev parent reply other threads:[~2014-08-28 21:46 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-19 0:21 [Qemu-devel] [PATCH v3 00/12] spapr: add support for pci hotplug Michael Roth
2014-08-19 0:21 ` [Qemu-devel] [PATCH 01/12] spapr: populate DRC entries for root dt node Michael Roth
2014-08-26 7:55 ` Alexey Kardashevskiy
2014-08-26 8:24 ` Alexey Kardashevskiy
2014-08-26 15:25 ` Michael Roth
2014-08-26 15:41 ` Michael Roth
2014-08-29 18:27 ` Tyrel Datwyler
2014-08-29 23:15 ` Alexander Graf
2014-08-26 14:56 ` Michael Roth
2014-09-05 0:31 ` [Qemu-devel] [Qemu-ppc] " Tyrel Datwyler
2014-08-26 11:11 ` [Qemu-devel] " Alexander Graf
2014-08-26 16:47 ` Michael Roth
2014-08-26 17:16 ` Alexander Graf
2014-09-03 5:55 ` Bharata B Rao
2014-09-05 22:00 ` Tyrel Datwyler
2014-08-19 0:21 ` [Qemu-devel] [PATCH 02/12] spapr_pci: populate DRC dt entries for PHBs Michael Roth
2014-08-26 8:32 ` Alexey Kardashevskiy
2014-08-26 17:16 ` Michael Roth
2014-08-26 9:09 ` Alexey Kardashevskiy
2014-08-26 17:52 ` Michael Roth
2014-08-26 11:29 ` Alexander Graf
2014-08-26 18:30 ` Michael Roth
2014-08-19 0:21 ` [Qemu-devel] [PATCH 03/12] spapr: add helper to retrieve a PHB/device DrcEntry Michael Roth
2014-08-19 0:21 ` [Qemu-devel] [PATCH 04/12] spapr_pci: add set-indicator RTAS interface Michael Roth
2014-08-26 11:36 ` Alexander Graf
2014-09-05 2:55 ` Nathan Fontenot
2014-09-30 22:08 ` Michael Roth
2014-10-01 14:30 ` Alexander Graf
2014-11-26 4:51 ` Bharata B Rao
2014-11-26 4:54 ` Bharata B Rao
2014-11-26 6:27 ` Michael Roth
2014-12-01 4:57 ` Bharata B Rao
2014-12-23 15:12 ` Michael Roth
2015-01-01 6:35 ` Bharata B Rao
2014-08-19 0:21 ` [Qemu-devel] [PATCH 05/12] spapr_pci: add get/set-power-level RTAS interfaces Michael Roth
2014-08-19 0:21 ` [Qemu-devel] [PATCH 06/12] spapr_pci: add get-sensor-state RTAS interface Michael Roth
2014-09-05 0:34 ` Tyrel Datwyler
2014-08-19 0:21 ` [Qemu-devel] [PATCH 07/12] spapr_pci: add ibm, configure-connector " Michael Roth
2014-08-26 9:12 ` Alexey Kardashevskiy
2014-09-05 3:03 ` Nathan Fontenot
2014-08-26 11:39 ` Alexander Graf
2014-08-19 0:21 ` [Qemu-devel] [PATCH 08/12] pci: allow 0 address for PCI IO regions Michael Roth
2014-08-26 9:14 ` Alexey Kardashevskiy
2014-08-26 11:55 ` Peter Maydell
2014-08-26 18:34 ` Michael Roth
2014-08-26 11:41 ` Alexander Graf
2014-08-27 13:47 ` Michael S. Tsirkin
2014-08-28 21:21 ` Michael Roth
2014-08-28 21:33 ` Peter Maydell
2014-08-28 21:46 ` Michael S. Tsirkin [this message]
2014-08-19 0:21 ` [Qemu-devel] [PATCH 09/12] spapr_pci: enable basic hotplug operations Michael Roth
2014-08-26 9:40 ` Alexey Kardashevskiy
2014-08-26 12:30 ` Alexander Graf
2014-09-03 10:33 ` Bharata B Rao
2014-09-03 23:03 ` Michael Roth
2014-09-04 15:08 ` Bharata B Rao
2014-09-04 16:12 ` Michael Roth
2014-09-04 16:34 ` Michael Roth
2014-09-05 3:10 ` Nathan Fontenot
2014-09-05 17:17 ` [Qemu-devel] [Qemu-ppc] " Tyrel Datwyler
2014-08-19 0:21 ` [Qemu-devel] [PATCH 10/12] spapr_events: re-use EPOW event infrastructure for hotplug events Michael Roth
2014-08-26 9:28 ` Alexey Kardashevskiy
2014-08-19 0:21 ` [Qemu-devel] [PATCH 11/12] spapr_events: event-scan RTAS interface Michael Roth
2014-08-26 9:30 ` Alexey Kardashevskiy
2014-08-29 18:43 ` Tyrel Datwyler
2014-08-19 0:21 ` [Qemu-devel] [PATCH 12/12] spapr_pci: emit hotplug add/remove events during hotplug Michael Roth
2014-08-26 9:35 ` Alexey Kardashevskiy
2014-08-26 12:36 ` Alexander Graf
2014-08-26 9:24 ` [Qemu-devel] [PATCH v3 00/12] spapr: add support for pci hotplug Alexey Kardashevskiy
-- strict thread matches above, loose matches on Subject: below --
2015-01-09 14:57 [Qemu-devel] [PATCH 08/12] pci: allow 0 address for PCI IO regions Claudio Fontana
2015-01-09 15:29 ` Michael Roth
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