[PATCH 0/5] ArmPkg, ArmVirtPkg: lift 40-bit IPA space limit

[Ard Biesheuvel <ard.biesheuvel@linaro.org>]

The ArmVirtQemu targets currently limit the size of the IPA space to
40 bits because that is all what KVM supports. However, this is about
to change, and so we need to update the code if we want to ensure that
our UEFI firmware builds can keep running on systems that set values
other than 40 (which could be > 40 or < 40)

So add a helper to ArmLib to read the number of supported address bits (#1)
and take this into account in the page table code (#2), which allows
PcdPrePiCpuMemorySize to assume a value that exceeds the capabilities of
the CPU.

Patch #3 is mostly a cleanup patch, to switch to the new helper added in
patch #1. No functional changes intended.

Patch #4 builds the CPU hob (and thus declares the size of the GCD memory
space) based on the CPU capabilities rather than the value of 
PcdPrePiCpuMemorySize, to prevent any potential regressions in memory
utilization when we bump PcdPrePiCpuMemorySize back to 48.

Patch #5 drops the definitions of PcdPrePiCpuMemorySize, reverting its
value back to the default 48.

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Cc: Eric Auger <eric.auger@redhat.com>
Cc: Andrew Jones <drjones@redhat.com>
Cc: Philippe Mathieu-Daude <philmd@redhat.com>
Cc: Julien Grall <julien.grall@linaro.org>

Ard Biesheuvel (5):
  ArmPkg/ArmLib: add support for reading the max physical address space
    size
  ArmPkg/ArmMmuLib: take the CPU supported maximum PA space into account
  ArmVirtPkg: refactor reading of the physical address space size
  ArmVirtPkg: disregard PcdPrePiCpuMemorySize PCD when sizing the GCD
    space
  ArmVirtPkg: revert PcdPrePiCpuMemorySize to is default value of 48

 ArmPkg/Include/Library/ArmLib.h               |  6 +++
 ArmPkg/Library/ArmLib/AArch64/ArmLibSupport.S | 16 ++++++++
 ArmPkg/Library/ArmLib/Arm/ArmLibSupport.S     |  8 ++++
 .../Library/ArmMmuLib/AArch64/ArmMmuLibCore.c |  5 ++-
 ArmVirtPkg/ArmVirtQemu.dsc                    |  5 ---
 ArmVirtPkg/ArmVirtQemu.fdf                    |  1 -
 ArmVirtPkg/ArmVirtQemuKernel.dsc              |  4 --
 .../Include/Library/ArmVirtMemInfoLib.h       |  1 +
 .../ArmVirtMemoryInitPeiLib.c                 |  7 +++-
 .../ArmVirtMemoryInitPeiLib.inf               |  1 +
 .../QemuVirtMemInfoLib/AArch64/PhysAddrTop.S  | 39 -------------------
 .../QemuVirtMemInfoLib/Arm/PhysAddrTop.S      | 24 ------------
 .../QemuVirtMemInfoLib/QemuVirtMemInfoLib.c   |  6 +--
 .../QemuVirtMemInfoLib/QemuVirtMemInfoLib.inf |  7 ----
 .../QemuVirtMemInfoPeiLib.inf                 |  7 ----
 .../XenVirtMemInfoLib/AArch64/PhysAddrTop.S   | 39 -------------------
 .../XenVirtMemInfoLib/Arm/PhysAddrTop.S       | 24 ------------
 .../XenVirtMemInfoLib/XenVirtMemInfoLib.c     |  8 +---
 .../XenVirtMemInfoLib/XenVirtMemInfoLib.inf   |  6 ---
 .../PrePi/ArmVirtPrePiUniCoreRelocatable.inf  |  3 --
 ArmVirtPkg/PrePi/PrePi.c                      |  3 --
 21 files changed, 46 insertions(+), 174 deletions(-)
 delete mode 100644 ArmVirtPkg/Library/QemuVirtMemInfoLib/AArch64/PhysAddrTop.S
 delete mode 100644 ArmVirtPkg/Library/QemuVirtMemInfoLib/Arm/PhysAddrTop.S
 delete mode 100644 ArmVirtPkg/Library/XenVirtMemInfoLib/AArch64/PhysAddrTop.S
 delete mode 100644 ArmVirtPkg/Library/XenVirtMemInfoLib/Arm/PhysAddrTop.S

-- 
2.17.1