[Bug 217379] Latency issues in irq_bypass_register_consumer

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=217379

Sean Christopherson (seanjc@google.com) changed:

           What    |Removed                     |Added
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                 CC|                            |seanjc@google.com

--- Comment #3 from Sean Christopherson (seanjc@google.com) ---
Huh.  Rereading this almost two years later, I realized I completely missed
that (a) your setup wasn't actually using irqbypass and (b) you suggested
giving userspace a way to disable irqbypass in KVM when it couldn't possibly be
utilized.

I've proposed adding a module param for other reasons[1].  If that doesn't
suffice, KVM could also provide KVM_IRQFD_FLAG_NO_IRQBYPASS (which would also
be useful for other reasons).

As for the ugly latency problems, I posted a new patch to use xarray to
mitigate the issue[2].

[1] https://lore.kernel.org/all/20250401161804.842968-1-seanjc@google.com
[2] https://lore.kernel.org/all/20250404211449.1443336-1-seanjc@google.com

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