Hi Jim, Thank you for the great support and expertise. It helps so much! :-)
Regards, Charles Charles Shih (史晨) Quality Engineer Red Hat, Platform QE, Virt QE, Section 1 Email: [email protected] IRC: cheshi @ #eng-china, #hyperv ,#qa, #virt T: +86 10 65627484 - IP: 8387484 M: +86 18611268098 On Wed, Jul 5, 2017 at 11:42 PM, Jim Fehlig <[email protected]> wrote: > On 06/18/2017 09:01 PM, Charles Shih wrote: > >> Dear All, >> >> I'm reaching this mail-list to ask a small question about disabling >> '3dnowprefetch' CPU feature in Xen Guest using libvirt. >> >> This is my environment: >> Fedora release 26 (Twenty Six) >> 4.11.0-0.rc3.git0.2.fc26.x86_64 >> xen-4.8.1-2.fc26.x86_64 >> libvirt-3.2.1-1.fc26.x86_64 >> >> I can disable '3dnowprefetch' CPU feature in guest via 'xl' command, >> with adding `cpuid='host,3dnowprefetch=0'` into the CFG file. >> >> However, follow the instruction (https://libvirt.org/formatdom >> ain.html#elementsCPU <https://libvirt.org/formatdomain.html#elementsCPU>), >> I added the following block into my XML file: >> >> ``` >> <cpu mode='host-passthrough' check='none'> >> <feature policy='disable' name='3dnowprefetch'/> >> </cpu> >> ``` >> >> Created the instance, seemed this feature was not being disabled in >> my guest. (I was able to see '3dnowprefetch' in `lscpu` outputs) >> >> Anybody has idea on this? Does libvirt support this for Xen? >> > > Currently, the libvirt libxl driver only supports VMX or SVM CPU feature, > and for that you'd need libvirt 3.3.0 > > http://libvirt.org/git/?p=libvirt.git;a=commit;h=c268b9eaeb4 > 321ef311ae2e152b80752918eb289 > > More support for CPU customization is on the todo list. Contributions are > always warmly welcomed :-). > > Regards, > Jim >
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