Re: [PATCH 00/13] Implement support for IBS virtualization

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Thu, Sep 07, 2023 at 09:19:51PM +0530, Manali Shukla wrote:

> > I'm not sure I'm fluent in virt speak (in fact, I'm sure I'm not). Is
> > the above saying that a host can never IBS profile a guest?
> 
> Host can profile a guest with IBS if VIBS is disabled for the guest. This is
> the default behavior. Host can not profile guest if VIBS is enabled for guest.
> 
> > 
> > Does the current IBS thing assert perf_event_attr::exclude_guest is set?
> 
> Unlike AMD core pmu, IBS doesn't have Host/Guest filtering capability, thus
> perf_event_open() fails if exclude_guest is set for an IBS event.

Then you must not allow VIBS if a host cpu-wide IBS counter exists.

Also, VIBS reads like it can be (ab)used as a filter.



[Index of Archives]     [KVM ARM]     [KVM ia64]     [KVM ppc]     [Virtualization Tools]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite Questions]     [Linux Kernel]     [Linux SCSI]     [XFree86]

  Powered by Linux