Re: [Qemu-devel] [edk2-rfc] [edk2-devel] CPU hotplug using SMM with QEMU+OVMF

[Paolo Bonzini]

On 22/08/19 19:59, Laszlo Ersek wrote:
> The firmware and QEMU could agree on a formula, which would compute the
> CPU-specific SMBASE from a value pre-programmed by the firmware, and the
> initial APIC ID of the hot-added CPU.
> 
> Yes, it would duplicate code -- the calculation -- between QEMU and
> edk2. While that's not optimal, it wouldn't be a first.

No, that would be unmaintainable.  The best solution to me seems to be
to make SMBASE programmable from non-SMM code if some special conditions
hold.  Michael, would it be possible to get in contact with the Intel
architects?

Paolo