[PATCH 0/3] tools/hvmloader: Decouple APIC IDs from vCPU IDs

[Alejandro Vallejo <alejandro.vallejo@xxxxxxxxx>]

The hypervisor, hvmloader and the toolstack currently engage in a shared
assumption that for every vCPU apicid == 2 * vcpuid. This series removes such
assumption from hvmloader, by making it read the APIC ID of each vCPU and
storing it for later use.

The last patch prevents writing an MP Tables should we have vCPUs that can not
be represented there. That's at the moment dead code because all vCPUs are
currently representable in 8 bits. This will inavitably stop being true in the
future after we increase the maximum number of guest vCPUs.

This short series is extracted from v7 of the much longer "Expose consistent
topology to guests".

  
https://lore.kernel.org/xen-devel/20241021154600.11745-5-alejandro.vallejo@xxxxxxxxx/

Changes with respect to the original patch on each individual patch.

Alejandro Vallejo (3):
  tools/hvmloader: Retrieve (x2)APIC IDs from the APs themselves
  tools/hvmloader: Replace LAPIC_ID() with cpu_to_apicid[]
  tools/hvmloader: Skip writing MP tables if any CPU has an APIC ID >=
    255

 tools/firmware/hvmloader/config.h    |  4 ++-
 tools/firmware/hvmloader/hvmloader.c | 12 ++++---
 tools/firmware/hvmloader/mp_tables.c |  2 +-
 tools/firmware/hvmloader/smp.c       | 47 +++++++++++++++++++++++++++-
 tools/firmware/hvmloader/util.c      |  2 +-
 5 files changed, 59 insertions(+), 8 deletions(-)

-- 
2.48.1