Re: [PATCH 00/19] Refresh queued CET virtualization series

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On 6/16/22 12:12, Peter Zijlstra wrote:
Do I understand this right in that a host without X86_KERNEL_IBT cannot
run a guest with X86_KERNEL_IBT on? That seems unfortunate, since that
was exactly what I did while developing the X86_KERNEL_IBT patches.

I'm thinking that if the hardware supports it, KVM should expose it,
irrespective of the host kernel using it.

For IBT in particular, I think all processor state is only loaded and stored at vmentry/vmexit (does not need XSAVES), so it should be feasible.

Paolo




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