[Bug 218259] High latency in KVM guests

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=218259

--- Comment #10 from Sean Christopherson (seanjc@google.com) ---
On Tue, Jan 16, 2024, bugzilla-daemon@kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=218259
> 
> --- Comment #9 from Joern Heissler (kernelbugs2012@joern-heissler.de) ---
> (In reply to Sean Christopherson from comment #5)
> > On Thu, Dec 14, 2023, bugzilla-daemon@kernel.org wrote:
> 
> > While the [tdp_mmu] module param is writable, it's effectively snapshotted
> by
> > each VM during creation, i.e. toggling it won't affect running VMs.
> 
> How can I see which MMU a running VM is using?

You can't, which in hindsight was a rather stupid thing for us to not make
visible
somewhere.  As of v6.3, the module param is read-only, i.e. it's either enable
or
disabled for all VMs, so sadly it's unlikely that older kernels will see any
kind
of "fix".

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