Fix domain parsing for GPU & add Display controller in the supported PCI class by vishesh92 · Pull Request #12981 · apache/cloudstack

vishesh92 · 2026-04-08T08:47:01Z

Description

This PR fixes #12960 & #12957

Types of changes

Breaking change (fix or feature that would cause existing functionality to change)
New feature (non-breaking change which adds functionality)
Bug fix (non-breaking change which fixes an issue)
Enhancement (improves an existing feature and functionality)
Cleanup (Code refactoring and cleanup, that may add test cases)
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Test (unit or integration test code)

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Pull request overview

This PR addresses CloudStack issue #12960 where GPU passthrough VM creation can fail on KVM due to incorrect parsing of PCI addresses (notably when the domain portion is present/expanded), leading to invalid libvirt PCI slot values.

Changes:

Update KVM GPU discovery script to consistently normalize/handle PCI addresses with and without an explicit domain and to key lookups using the domain-qualified form.
Update LibvirtGpuDef PCI XML generation to accept both bb:ss.f and dddd:bb:ss.f bus address formats.
Add unit tests covering full PCI addresses (domain 0, non-zero domain) and legacy short BDF behavior.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
scripts/vm/hypervisor/kvm/gpudiscovery.sh	Normalizes PCI address handling (domain-aware) across sysfs access, cache keys, and VM usage mapping to avoid wrong BDF parsing.
plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/LibvirtGpuDef.java	Extends PCI address parsing to support `domain:bus:slot.func` input, preventing slot mis-parsing when a domain is present.
plugins/hypervisors/kvm/src/test/java/com/cloud/hypervisor/kvm/resource/LibvirtGpuDefTest.java	Adds regression/unit tests for full PCI addresses and backward compatibility for short BDF inputs.

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plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/LibvirtGpuDef.java

plugins/hypervisors/kvm/src/test/java/com/cloud/hypervisor/kvm/resource/LibvirtGpuDefTest.java

codecov · 2026-04-08T08:56:02Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 3.70%. Comparing base (abdf926) to head (4e7a834).
⚠️ Report is 1 commits behind head on 4.22.

❗ There is a different number of reports uploaded between BASE (abdf926) and HEAD (4e7a834). Click for more details.

HEAD has 1 upload less than BASE

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unittests 1 0

Additional details and impacted files

@@              Coverage Diff              @@
##               4.22   #12981       +/-   ##
=============================================
- Coverage     17.60%    3.70%   -13.90%     
=============================================
  Files          5918      448     -5470     
  Lines        531681    38042   -493639     
  Branches      65005     7038    -57967     
=============================================
- Hits          93589     1409    -92180     
+ Misses       427539    36446   -391093     
+ Partials      10553      187    -10366

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this adds support for the amd instinct mi2xx accelorator crards in the discovery script.

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Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

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scripts/vm/hypervisor/kvm/gpudiscovery.sh

plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/LibvirtGpuDef.java

vishesh92 · 2026-04-08T10:13:05Z

@blueorangutan package

blueorangutan · 2026-04-08T10:14:05Z

@vishesh92 a [SL] Jenkins job has been kicked to build packages. It will be bundled with KVM, XenServer and VMware SystemVM templates. I'll keep you posted as I make progress.

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Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

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scripts/vm/hypervisor/kvm/gpudiscovery.sh

Copilot · 2026-04-08T10:19:53Z

scripts/vm/hypervisor/kvm/gpudiscovery.sh

@@ -882,10 +989,7 @@ for LINE in "${LINES[@]}"; do
 	if [[ ${#vlist[@]} -eq 0 && ${#flist[@]} -eq 0 ]]; then
 		FP_ENABLED=1
 	fi


parse_pci_address assigns DOMAIN/BUS/SLOT/FUNC via bash dynamic scoping; these call sites don’t declare those variables local first, so the values can leak into the global scope (and between loop iterations), making future changes/debugging brittle. Declare local DOMAIN BUS SLOT FUNC in the immediate scope before calling parse_pci_address (as is already done in process_mdev_instances), or refactor parse_pci_address to return values explicitly (e.g., via stdout or nameref parameters).

Suggested change

fi

fi

local DOMAIN BUS SLOT FUNC

blueorangutan · 2026-04-08T11:06:02Z

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ el10 ✔️ debian ✔️ suse15. SL-JID 17398

Fix domain parsing for GPU

7d7b664

boring-cyborg bot added the component:kvm label Apr 8, 2026

vishesh92 requested review from Copilot and sureshanaparti April 8, 2026 08:47

Copilot started reviewing on behalf of vishesh92 April 8, 2026 08:47 View session

Copilot AI reviewed Apr 8, 2026

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plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/LibvirtGpuDef.java Outdated Show resolved Hide resolved

plugins/hypervisors/kvm/src/test/java/com/cloud/hypervisor/kvm/resource/LibvirtGpuDefTest.java Outdated Show resolved Hide resolved

vishesh92 and others added 3 commits April 8, 2026 14:32

Address comments

78a5114

Add Display controller to GPU class check

8ead015

this adds support for the amd instinct mi2xx accelorator crards in the discovery script.

fixup

6fa2a88

vishesh92 mentioned this pull request Apr 8, 2026

Add Display controller to GPU class check #12959

Closed

14 tasks

vishesh92 changed the title ~~Fix domain parsing for GPU~~ Fix domain parsing for GPU & add Display controller in the supported PCI class Apr 8, 2026

vishesh92 requested a review from Copilot April 8, 2026 09:13

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scripts/vm/hypervisor/kvm/gpudiscovery.sh Show resolved Hide resolved

scripts/vm/hypervisor/kvm/gpudiscovery.sh Outdated Show resolved Hide resolved

plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/LibvirtGpuDef.java Show resolved Hide resolved

DaanHoogland added this to the 4.22.1 milestone Apr 8, 2026

This was linked to issues Apr 8, 2026

GPU Discovery not detecting AMD Mi2xx GPUs #12957

Open

CloudStack 4.22 – GPU passthrough VM creation fails due to invalid PCI slot mapping #12960

Open

Address comments

8d09790

vishesh92 requested a review from Copilot April 8, 2026 10:12

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Copilot started reviewing on behalf of vishesh92 April 8, 2026 10:30 View session

Address comments

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Fix domain parsing for GPU & add Display controller in the supported PCI class#12981

Fix domain parsing for GPU & add Display controller in the supported PCI class#12981
vishesh92 wants to merge 6 commits intoapache:4.22from
shapeblue:fix-domain-in-gpu

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Description

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