Re: [edk2-devel] [PATCH 1/6] UefiCpuPkg/LocalApicTimerDxe: Duplicate OvmfPkg/LocalApicTimerDxe driver

["Gerd Hoffmann" <kraxel@redhat.com>]

  Hi,

> Right, I have the same question -- although, admittedly, I've not been
> CC'd on the cover letter (0/6), and the reason could be captured there.

It wasn't.

> On a second thought, I'm (retroactively?) surprised that
> LocalApicTimerDxe was (apparently?) first introduced under OvmfPkg --
> i.e., for VMs? That's not impossible, but feels a bit strange.

I think the reason is that the next timer interrupt arriving while the
handler is running still is *much* more likely in virtual machines
because the vCPU does not get 100% of the of the physical CPU time
slice.

So on OVMF we will continue to need NestedInterruptTplLib.  I like the
idea to have a Null version of the library, so OVMF does not need its
own version of the driver just because of NestedInterruptTplLib.

take care,
  Gerd



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