[edk2-devel] [PATCH 10/17] OvmfPkg/Microvm: use XenTimerDxe (lapic timer)

[Ard Biesheuvel]

On Wed, 1 Sept 2021 at 09:20, Gerd Hoffmann <kraxel at redhat.com> wrote:
>
...
> Is it possible to have multiple drivers implementing the
> EfiTimerArchProtocol in one firmware binary, then just use the one which
> successfully initializes first?  If so, can I define the initialization
> order?  i.e. can I add a kvmclock driver, try initialize it first, when
> it works use it, otherwise (because tcg) fallback to some other driver?
>

I don't think that should be a problem, as long as the
EfiTimerArchProtocol becomes available early enough to satisfy all
dependencies on it. But avoid exposing more than one instance: I don't
think you are guaranteed to get the right one (i.e., the one that got
registered first)


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