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[PATCH v3 0/5] target/arm: Reduced-IPA space and highmem=off fixes
From: |
Marc Zyngier |
Subject: |
[PATCH v3 0/5] target/arm: Reduced-IPA space and highmem=off fixes |
Date: |
Mon, 27 Dec 2021 21:16:37 +0000 |
Here's another stab at enabling QEMU on systems with pathologically
reduced IPA ranges such as the Apple M1 (previous 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 v5.16-rc6
with both KVM and TCG.
* From v2:
- Fixed checking of the maximum memory against the IPA space
- Fixed TCG memory map creation
- Rebased on top of QEMU's 89f3bfa326
- Collected Andrew's RBs, with thanks
[1] https://lore.kernel.org/r/20211003164605.3116450-1-maz@kernel.org
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 | 67 ++++++++++++++++++++++++++++++++++------
include/hw/arm/virt.h | 4 ++-
3 files changed, 67 insertions(+), 16 deletions(-)
--
2.30.2
- [PATCH v3 0/5] target/arm: Reduced-IPA space and highmem=off fixes,
Marc Zyngier <=
- [PATCH v3 5/5] hw/arm/virt: Disable highmem devices that don't fit in the PA range, Marc Zyngier, 2021/12/27
- [PATCH v3 2/5] hw/arm/virt: Add a control for the the highmem redistributors, Marc Zyngier, 2021/12/27
- [PATCH v3 3/5] hw/arm/virt: Honor highmem setting when computing the memory map, Marc Zyngier, 2021/12/27
- [PATCH v3 1/5] hw/arm/virt: Key enablement of highmem PCIe on highmem_ecam, Marc Zyngier, 2021/12/27
- [PATCH v3 4/5] hw/arm/virt: Use the PA range to compute the memory map, Marc Zyngier, 2021/12/27