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SubjectRe: [PATCH] KVM: x86/svm: Add module param to control PMU virtualization
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On 12/10/21 20:25, Jim Mattson wrote:
> In the long run, I'd like to be able to override this system-wide
> setting on a per-VM basis, for VMs that I trust. (Of course, this
> implies that I trust the userspace process as well.)
>
> How would you feel if we were to add a kvm ioctl to override this
> setting, for a particular VM, guarded by an appropriate permissions
> check, like capable(CAP_SYS_ADMIN) or capable(CAP_SYS_MODULE)?

What's the rationale for guarding this with a capability check? IIRC
you don't have such checks for perf_event_open (apart for getting kernel
addresses, which is not a problem for virtualization).

Paolo

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