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Date: Fri, 7 Jan 2022 13:07:24 +0100
From: "Gerd Hoffmann" <kraxel@redhat.com>
To: "Boeuf, Sebastien" <sebastien.boeuf@intel.com>
Cc: "devel@edk2.groups.io" <devel@edk2.groups.io>
Subject: Re: EFI shell with microvm
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  Hi,

> > microvm has no lpc bridge, so I had to do it in a different way ...
> 
> Cloud Hypervisor doesn't emulate any LPC bridge or ISA bus.

Ok, doing it microvm-style makes sense then.

> > Works fine for me.
> > 
> > qemu-system-x86_64 -nographic -machine microvm,rtc=on -bios
> > Build/MicrovmX64/DEBUG_GCC5/FV/MICROVM.fd
> 
> Thanks for the confirmation, something might be wrong with the
> interrupt used for my serial device.

tianocore doesn't use interrupts (other than timer).

> Cloud Hypervisor only has an IOAPIC, it doesn't rely on any PIC, which
> is why I'm not sure what might be missing to get the EFI shell to
> receive the interrupts.

PIC is optional for microvm too, and everything works fine for me with
"-machine microvm,rtc=on,pic=off,pit=off"

take care,
  Gerd