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Re: [PATCH v1 1/4] xen/acpi: upload power and performance related data from a PVH dom0
- To: Penny Zheng <Penny.Zheng@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
- From: Jürgen Groß <jgross@xxxxxxxx>
- Date: Wed, 4 Dec 2024 09:29:58 +0100
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- Cc: Ray Huang <Ray.Huang@xxxxxxx>, Xenia Ragiadakou <Xenia.Ragiadakou@xxxxxxx>, Jason Andryuk <jason.andryuk@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 04 Dec 2024 08:30:09 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04.12.24 09:24, Penny Zheng wrote:
From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
When running as a PVH dom0 the ACPI MADT is crafted by Xen in order to
report the correct numbers of vCPUs that dom0 has, so the host MADT is
not provided to dom0. This creates issues when parsing the power and
performance related data from ACPI dynamic tables, as the ACPI
Processor UIDs found on the dynamic code are likely to not match the
ones crafted by Xen in the dom0 MADT.
Xen would rely on Linux having filled at least the power and
performance related data of the vCPUs on the system, and would clone
that information in order to setup the remaining pCPUs on the system
if dom0 vCPUs < pCPUs. However when running as PVH dom0 it's likely
that none of dom0 CPUs will have the power and performance data
filled, and hence the Xen ACPI Processor driver needs to fetch that
information by itself.
In order to do so correctly, introduce a new helper to fetch the _CST
data without taking into account the system capabilities from the
CPUID output, as the capabilities reported to dom0 in CPUID might be
different from the ones on the host.
Note that the newly introduced code will only fetch the _CST, _PSS,
_PPC and _PCT from a single CPU, and clone that information for all the
other Processors. This won't work on an heterogeneous system with
Processors having different power and performance related data between
them.
Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Signed-off-by: Jason Andryuk <jason.andryuk@xxxxxxx>
I think this is the V2 version of Jason's patch, of which he sent V3 just
yesterday?
Please sync with him how to proceed: is his patch meant to be a prerequisite
for your series or a part of it?
Juergen
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