From: "Michael S. Tsirkin" <mst@redhat.com>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: "eduardo@habkost.net" <eduardo@habkost.net>,
"Elena Ufimtseva" <elena.ufimtseva@oracle.com>,
"Jag Raman" <jag.raman@oracle.com>,
"Beraldo Leal" <bleal@redhat.com>,
"john.levon@nutanix.com" <john.levon@nutanix.com>,
"John Johnson" <john.g.johnson@oracle.com>,
"quintela@redhat.com" <quintela@redhat.com>,
qemu-devel <qemu-devel@nongnu.org>,
"armbru@redhat.com" <armbru@redhat.com>,
"Alex Williamson" <alex.williamson@redhat.com>,
"thanos.makatos@nutanix.com" <thanos.makatos@nutanix.com>,
"Marc-André Lureau" <marcandre.lureau@gmail.com>,
"Stefan Hajnoczi" <stefanha@redhat.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Daniel P. Berrangé" <berrange@redhat.com>,
"Eric Blake" <eblake@redhat.com>,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
"Philippe Mathieu-Daudé" <f4bug@amsat.org>
Subject: Re: [PATCH v5 03/18] pci: isolated address space for PCI bus
Date: Wed, 2 Feb 2022 05:06:49 -0500 [thread overview]
Message-ID: <20220202050526-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <CAFEAcA-f6ZBgAtKr-nUFTR8nfMGVWF=uExoRaMajN7t6wU7f7g@mail.gmail.com>
On Wed, Feb 02, 2022 at 09:30:42AM +0000, Peter Maydell wrote:
> > I/O port space is always the identity mapped CPU address space unless
> > sparse translations are used to create multiple I/O port spaces (not
> > implemented). I/O port space is only accessed by the CPU, there are no
> > device initiated I/O port transactions, so the address space relative
> > to the device is irrelevant.
>
> Does the PCI spec actually forbid any master except the CPU from
> issuing I/O port transactions, or is it just that in practice nobody
> makes a PCI device that does weird stuff like that ?
>
> thanks
> -- PMM
Hmm, the only thing vaguely related in the spec that I know of is this:
PCI Express supports I/O Space for compatibility with legacy devices which require their use.
Future revisions of this specification may deprecate the use of I/O Space.
Alex, what did you refer to?
--
MST
next prev parent reply other threads:[~2022-02-02 10:11 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-19 21:41 [PATCH v5 00/18] vfio-user server in QEMU Jagannathan Raman
2022-01-19 21:41 ` [PATCH v5 01/18] configure, meson: override C compiler for cmake Jagannathan Raman
2022-01-20 13:27 ` Paolo Bonzini
2022-01-20 15:21 ` Jag Raman
2022-02-17 6:10 ` Jag Raman
2022-01-19 21:41 ` [PATCH v5 02/18] tests/avocado: Specify target VM argument to helper routines Jagannathan Raman
2022-01-25 9:40 ` Stefan Hajnoczi
2022-01-19 21:41 ` [PATCH v5 03/18] pci: isolated address space for PCI bus Jagannathan Raman
2022-01-20 0:12 ` Michael S. Tsirkin
2022-01-20 15:20 ` Jag Raman
2022-01-25 18:38 ` Dr. David Alan Gilbert
2022-01-26 5:27 ` Jag Raman
2022-01-26 9:45 ` Stefan Hajnoczi
2022-01-26 20:07 ` Dr. David Alan Gilbert
2022-01-26 21:13 ` Michael S. Tsirkin
2022-01-27 8:30 ` Stefan Hajnoczi
2022-01-27 12:50 ` Michael S. Tsirkin
2022-01-27 21:22 ` Alex Williamson
2022-01-28 8:19 ` Stefan Hajnoczi
2022-01-28 9:18 ` Stefan Hajnoczi
2022-01-31 16:16 ` Alex Williamson
2022-02-01 9:30 ` Stefan Hajnoczi
2022-02-01 15:24 ` Alex Williamson
2022-02-01 21:24 ` Jag Raman
2022-02-01 22:47 ` Alex Williamson
2022-02-02 1:13 ` Jag Raman
2022-02-02 5:34 ` Alex Williamson
2022-02-02 9:22 ` Stefan Hajnoczi
2022-02-10 0:08 ` Jag Raman
2022-02-10 8:02 ` Michael S. Tsirkin
2022-02-10 22:23 ` Jag Raman
2022-02-10 22:53 ` Michael S. Tsirkin
2022-02-10 23:46 ` Jag Raman
2022-02-10 23:17 ` Alex Williamson
2022-02-10 23:28 ` Michael S. Tsirkin
2022-02-10 23:49 ` Alex Williamson
2022-02-11 0:26 ` Michael S. Tsirkin
2022-02-11 0:54 ` Jag Raman
2022-02-11 0:10 ` Jag Raman
2022-02-02 9:30 ` Peter Maydell
2022-02-02 10:06 ` Michael S. Tsirkin [this message]
2022-02-02 15:49 ` Alex Williamson
2022-02-02 16:53 ` Michael S. Tsirkin
2022-02-02 17:12 ` Alex Williamson
2022-02-01 10:42 ` Dr. David Alan Gilbert
2022-01-26 18:13 ` Dr. David Alan Gilbert
2022-01-27 17:43 ` Jag Raman
2022-01-25 9:56 ` Stefan Hajnoczi
2022-01-25 13:49 ` Jag Raman
2022-01-25 14:19 ` Stefan Hajnoczi
2022-01-19 21:41 ` [PATCH v5 04/18] pci: create and free isolated PCI buses Jagannathan Raman
2022-01-25 10:25 ` Stefan Hajnoczi
2022-01-25 14:10 ` Jag Raman
2022-01-19 21:41 ` [PATCH v5 05/18] qdev: unplug blocker for devices Jagannathan Raman
2022-01-25 10:27 ` Stefan Hajnoczi
2022-01-25 14:43 ` Jag Raman
2022-01-26 9:32 ` Stefan Hajnoczi
2022-01-26 15:13 ` Jag Raman
2022-01-19 21:41 ` [PATCH v5 06/18] vfio-user: add HotplugHandler for remote machine Jagannathan Raman
2022-01-25 10:32 ` Stefan Hajnoczi
2022-01-25 18:12 ` Jag Raman
2022-01-26 9:35 ` Stefan Hajnoczi
2022-01-26 15:20 ` Jag Raman
2022-01-26 15:43 ` Stefan Hajnoczi
2022-01-19 21:41 ` [PATCH v5 07/18] vfio-user: set qdev bus callbacks " Jagannathan Raman
2022-01-25 10:44 ` Stefan Hajnoczi
2022-01-25 21:12 ` Jag Raman
2022-01-26 9:37 ` Stefan Hajnoczi
2022-01-26 15:51 ` Jag Raman
2022-01-19 21:41 ` [PATCH v5 08/18] vfio-user: build library Jagannathan Raman
2022-01-19 21:41 ` [PATCH v5 09/18] vfio-user: define vfio-user-server object Jagannathan Raman
2022-01-25 14:40 ` Stefan Hajnoczi
2022-01-19 21:41 ` [PATCH v5 10/18] vfio-user: instantiate vfio-user context Jagannathan Raman
2022-01-25 14:44 ` Stefan Hajnoczi
2022-01-19 21:42 ` [PATCH v5 11/18] vfio-user: find and init PCI device Jagannathan Raman
2022-01-25 14:48 ` Stefan Hajnoczi
2022-01-26 3:14 ` Jag Raman
2022-01-19 21:42 ` [PATCH v5 12/18] vfio-user: run vfio-user context Jagannathan Raman
2022-01-25 15:10 ` Stefan Hajnoczi
2022-01-26 3:26 ` Jag Raman
2022-01-19 21:42 ` [PATCH v5 13/18] vfio-user: handle PCI config space accesses Jagannathan Raman
2022-01-25 15:13 ` Stefan Hajnoczi
2022-01-19 21:42 ` [PATCH v5 14/18] vfio-user: handle DMA mappings Jagannathan Raman
2022-01-19 21:42 ` [PATCH v5 15/18] vfio-user: handle PCI BAR accesses Jagannathan Raman
2022-01-19 21:42 ` [PATCH v5 16/18] vfio-user: handle device interrupts Jagannathan Raman
2022-01-25 15:25 ` Stefan Hajnoczi
2022-01-19 21:42 ` [PATCH v5 17/18] vfio-user: register handlers to facilitate migration Jagannathan Raman
2022-01-25 15:48 ` Stefan Hajnoczi
2022-01-27 17:04 ` Jag Raman
2022-01-28 8:29 ` Stefan Hajnoczi
2022-01-28 14:49 ` Thanos Makatos
2022-02-01 3:49 ` Jag Raman
2022-02-01 9:37 ` Stefan Hajnoczi
2022-01-19 21:42 ` [PATCH v5 18/18] vfio-user: avocado tests for vfio-user Jagannathan Raman
2022-01-26 4:25 ` Philippe Mathieu-Daudé via
2022-01-26 15:12 ` Jag Raman
2022-01-25 16:00 ` [PATCH v5 00/18] vfio-user server in QEMU Stefan Hajnoczi
2022-01-26 5:04 ` Jag Raman
2022-01-26 9:56 ` Stefan Hajnoczi
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