7:27 a.m.
Andrea Bolognani (1):
docs: Update introduction in pci-addresses.rst
Boris Fiuczynski (1):
docs: Improve zPCI section in pci-addresses.rst
docs/pci-addresses.rst | 31 ++++++++++++++++++-------------
1 file changed, 18 insertions(+), 13 deletions(-)
--
2.25.1
7:27 a.m.
New subject: [PATCH v2 1/2] docs: Update introduction in pci-addresses.rst
Changing the introduction to bring the idea of this document better across.
Signed-off-by: Andrea Bolognani <abologna(a)redhat.com>
Reviewed-by: Boris Fiuczynski <fiuczy(a)linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck(a)redhat.com>
---
docs/pci-addresses.rst | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/docs/pci-addresses.rst b/docs/pci-addresses.rst
index 1d2dc8e5fc..7c8e9edd73 100644
--- a/docs/pci-addresses.rst
+++ b/docs/pci-addresses.rst
@@ -4,9 +4,12 @@ PCI addresses in domain XML and guest OS
.. contents::
-When discussing PCI addresses, it's important to understand the
-relationship between the addresses that can be seen in the domain XML
-and those that are visible inside the guest OS.
+Looking at the configuration for a guest, it would be reasonable
+to expect that each PCI device would show up in the guest OS with
+a PCI address that matches the one present in the corresponding
+``<address>`` element of the domain XML, but that's not guaranteed
+to happen and will in fact not be the case in all but the simplest
+scenarios.
Simple cases
--
2.25.1
7:27 a.m.
New subject: [PATCH v2 2/2] docs: Improve zPCI section in pci-addresses.rst
Improving the zPCI example by choosing more distinct values and
adding explanation for fid.
Signed-off-by: Boris Fiuczynski <fiuczy(a)linux.ibm.com>
---
docs/pci-addresses.rst | 22 ++++++++++++----------
1 file changed, 12 insertions(+), 10 deletions(-)
diff --git a/docs/pci-addresses.rst b/docs/pci-addresses.rst
index 7c8e9edd73..885d50517a 100644
--- a/docs/pci-addresses.rst
+++ b/docs/pci-addresses.rst
@@ -176,14 +176,14 @@ In the simplest case, the following XML snippet
<model name='pci-bridge'/>
<target chassisNr='1'/>
<address type='pci' domain='0x0000' bus='0x00'
slot='0x01' function='0x0'>
- <zpci uid='0x0002' fid='0x00000001'/>
+ <zpci uid='0x0001' fid='0x00000000'/>
</address>
</controller>
<interface type='bridge'>
<source bridge='virbr0'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x01'
slot='0x01' function='0x0'>
- <zpci uid='0x0001' fid='0x00000000'/>
+ <zpci uid='0x0007' fid='0x00000003'/>
</address>
</interface>
@@ -191,21 +191,23 @@ will result in the following in a Linux guest:
::
- 0001:00:00.0 Ethernet controller: Red Hat, Inc. Virtio network device
+ 0007:00:00.0 Ethernet controller: Red Hat, Inc. Virtio network device
Note that the PCI bridge is not visible in the guest; s390x always has a flat
-topology.
+topology. The PCI address in the guest is generated from the information
+provided via the ``zpci`` element: more specifically, ``uid`` is used as the
+PCI domain. ``fid`` doesn't appear in the PCI address itself, but it will be
+used in sysfs (``/sys/bus/pci/slots/$fid/...``).
-Neither are any changes in the PCI address visible in the guest; replacing
-the PCI address for the ``virtio-net`` device with
+Any changes in the PCI address are not visible in the guest; replacing the PCI
+address for the ``virtio-net`` device with
::
- <address type='pci' domain='0x0000' bus='0x01'
slot='0x07' function='0x3'>
+ <address type='pci' domain='0x0000' bus='0x01'
slot='0x06' function='0x4'>
-will result in the exactly same view in the guest, as the addresses there
-are generated from the information provided via the ``zpci`` element (in
-fact, from the ``uid``).
+will result in the exactly same view in the guest, as the ``fid`` and ``uid``
+values in the ``zpci`` element remain unchanged.
Device assignment
--
2.25.1
7:32 a.m.
New subject: [PATCH v2 2/2] docs: Improve zPCI section in pci-addresses.rst
On Fri, 17 Apr 2020 14:27:34 +0200
Boris Fiuczynski <fiuczy(a)linux.ibm.com> wrote:
Improving the zPCI example by choosing more distinct values and
adding explanation for fid.
Signed-off-by: Boris Fiuczynski <fiuczy(a)linux.ibm.com>
---
docs/pci-addresses.rst | 22 ++++++++++++----------
1 file changed, 12 insertions(+), 10 deletions(-)
Reviewed-by: Cornelia Huck <cohuck(a)redhat.com>
8:06 a.m.
On Fri, 2020-04-17 at 14:27 +0200, Boris Fiuczynski wrote:
Andrea Bolognani (1):
docs: Update introduction in pci-addresses.rst
Boris Fiuczynski (1):
docs: Improve zPCI section in pci-addresses.rst
docs/pci-addresses.rst | 31 ++++++++++++++++++-------------
1 file changed, 18 insertions(+), 13 deletions(-)
Series
Reviewed-by: Andrea Bolognani <abologna(a)redhat.com>
and pushed.
Thank you both for your contributions and your patience :)
--
Andrea Bolognani / Red Hat / Virtualization
8:44 a.m.
On 4/17/20 3:06 PM, Andrea Bolognani wrote:
On Fri, 2020-04-17 at 14:27 +0200, Boris Fiuczynski wrote:
> Andrea Bolognani (1):
> docs: Update introduction in pci-addresses.rst
> Boris Fiuczynski (1):
> docs: Improve zPCI section in pci-addresses.rst
>
> docs/pci-addresses.rst | 31 ++++++++++++++++++-------------
> 1 file changed, 18 insertions(+), 13 deletions(-)
Series
Reviewed-by: Andrea Bolognani <abologna(a)redhat.com>
and pushed.
Thank you both for your contributions and your patience :)
Thanks for pushing the changes and your patience. Have a nice weekend.
--
Mit freundlichen Grüßen/Kind regards
Boris Fiuczynski
IBM Deutschland Research & Development GmbH
Vorsitzender des Aufsichtsrats: Gregor Pillen
Geschäftsführung: Dirk Wittkopp
Sitz der Gesellschaft: Böblingen
Registergericht: Amtsgericht Stuttgart, HRB 243294
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Cornelia Huck