Here's another stab at enabling QEMU on systems with pathologically reduced IPA ranges such as the Apple M1 (original version at [1]). Eventually, we're able to run a KVM guest with more than just 3GB of RAM on a system with a 36bit IPA space, and at most 123 vCPUs. This series does a few things: - decouple the enabling of the highmem PCIe region from the highmem attribute - introduce a new attribute to control the enabling of the highmem GICv3 redistributors - correctly cap the PA range with highmem is off - generalise the highmem behaviour to any PA range - disable both highmem PCIe and GICv3 RDs when they are outside of the PA range This has been tested on an M1-based Mac-mini running Linux v5.15-rc3. [1] https://lore.kernel.org/r/20210822144441.1290891-1-maz@xxxxxxxxxx Marc Zyngier (5): hw/arm/virt: Key enablement of highmem PCIe on highmem_ecam hw/arm/virt: Add a control for the the highmem redistributors hw/arm/virt: Honor highmem setting when computing the memory map hw/arm/virt: Use the PA range to compute the memory map hw/arm/virt: Disable highmem devices that don't fit in the PA range hw/arm/virt-acpi-build.c | 12 ++++----- hw/arm/virt.c | 53 ++++++++++++++++++++++++++++++++++------ include/hw/arm/virt.h | 4 ++- 3 files changed, 54 insertions(+), 15 deletions(-) -- 2.30.2
