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Re: VT-x turned off and on


On 31/08/2021 00:42, TheBearAK wrote:
Discovered that VT-b was turned off in my server's BIOS.   After turning it on, I get these results from xl dmesg:

(XEN) Intel VT-d iommu 0 supported page sizes: 4kB
(XEN) Intel VT-d Snoop Control enabled.
(XEN) Intel VT-d Dom0 DMA Passthrough not enabled.
(XEN) Intel VT-d Queued Invalidation enabled.
(XEN) Intel VT-d Interrupt Remapping enabled.
(XEN) Intel VT-d Posted Interrupt not enabled.
(XEN) Intel VT-d Shared EPT tables not enabled.
(XEN) I/O virtualisation enabled
(XEN)  - Dom0 mode: Relaxed
(XEN) Interrupt remapping enabled

That shows me that it is turned on and working, but if I do a

#egrep -c '(vmx|svm)' /proc/cpuinfo

It doesn't find anything (0)

This is expected because /proc/cpuinfo shows the features exposed to dom0 and Xen will hide VMX/SVM.

If you boot on directly Linux, you should be able to find VMX/SVM from /proc/cpuinfo.

Best regards,

Julien Grall



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