ustcweizhou opened a new pull request #3335: kvm: disable cpu features if feature starts with '-' URL: https://github.com/apache/cloudstack/pull/3335 When I use SandyBridge as custom cpu in my testing, vm failed to start due to following error: ``` org.libvirt.LibvirtException: unsupported configuration: guest and host CPU are not compatible: Host CPU does not provide required features: avx, xsave, aes, tsc-deadline, x2apic, pclmuldq ``` With this patch, it works with the following setting in agent.properties: ``` guest.cpu.mode=custom guest.cpu.model=SandyBridge guest.cpu.features=-avx -xsave -aes -tsc-deadline -x2apic -pclmuldq ``` vm cpu is defined as below: ``` <cpu mode='custom' match='exact'> <model fallback='allow'>SandyBridge</model> <feature policy='disable' name='avx'/> <feature policy='disable' name='xsave'/> <feature policy='disable' name='aes'/> <feature policy='disable' name='tsc-deadline'/> <feature policy='disable' name='x2apic'/> <feature policy='disable' name='pclmuldq'/> </cpu> ``` ## Description <!--- Describe your changes in detail --> <!-- For new features, provide link to FS, dev ML discussion etc. --> <!-- In case of bug fix, the expected and actual behaviours, steps to reproduce. --> <!-- When "Fixes: #<id>" is specified, the issue/PR will automatically be closed when this PR gets merged --> <!-- For addressing multiple issues/PRs, use multiple "Fixes: #<id>" --> <!-- Fixes: # --> ## Types of changes <!--- What types of changes does your code introduce? Put an `x` in all the boxes that apply: --> - [ ] 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) - [X] Enhancement (improves an existing feature and functionality) - [ ] Cleanup (Code refactoring and cleanup, that may add test cases) ## Screenshots (if appropriate): ## How Has This Been Tested? <!-- Please describe in detail how you tested your changes. --> <!-- Include details of your testing environment, and the tests you ran to --> <!-- see how your change affects other areas of the code, etc. --> 1. add agent.properties to server using KVM, and restart cloudstack-agent guest.cpu.mode=custom guest.cpu.model=<cpu model> guest.cpu.features=<cpu features, seperated by space> 2. create a vm on the server cpu feature starts with "-" will be disabled, others will be enabled. ``` <cpu mode='custom' match='exact'> <model fallback='allow'><cpu mode></model> <feature policy='disable' name='<cpu feature starts with "-">'/> <feature policy='require' name='<other cpu feature>'/> </cpu> ``` <!-- Please read the [CONTRIBUTING](https://github.com/apache/cloudstack/blob/master/CONTRIBUTING.md) document -->
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