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[Qemu-devel] [PATCH 0/2] ARM virt: Support up to 256 PCIe buses
From: |
Eric Auger |
Subject: |
[Qemu-devel] [PATCH 0/2] ARM virt: Support up to 256 PCIe buses |
Date: |
Wed, 30 May 2018 16:26:18 +0200 |
Current Machvirt PCI host controller's ECAM region is 16MB large.
This limits the number of PCIe buses to 16.
PC/Q35 machines have a 256MB region allowing up to 256 buses.
This series tries to bridge the gap.
It declares a new ECAM region located beyond 256GB, of size 256MB
The new ECAM region is used if:
- highmem option is set (default) and,
- either FW is not loaded or we are run an aarch64 guest
- machine type >= 3.0.
aarch32 FW does not support this highmem ECAM region. For guests without
LPAE support the highmem option must be turned off.
Best Regards
Eric
Git: complete series available at
https://github.com/eauger/qemu/tree/v2.12.0-256MB-ECAM-PATCH-v1
Previous version:
https://github.com/eauger/qemu/tree/v2.12.0-256MB-ECAM-RFCv1
- Tested with guest running in aarch64 and aarch32 modes (aarch64=off)
- Tested with aarch32 FW
- In aarch32 mode I encountered the issue the vmalloc region may be
reported too small for the needs (dmesg excerpt below). So I had to
extend the vmalloc size by passing the "vmalloc=512M" option to the
bootargs and this eventually booted fine.
[ 1.399581] pl061_gpio 9030000.pl061: PL061 GPIO chip @0x0000000009030000
registered
[ 1.402636] OF: PCI: host bridge /address@hidden ranges:
[ 1.404506] OF: PCI: IO 0x3eff0000..0x3effffff -> 0x00000000
[ 1.406606] OF: PCI: MEM 0x10000000..0x3efeffff -> 0x10000000
[ 1.408690] OF: PCI: MEM 0x8000000000..0xffffffffff -> 0x8000000000
[ 1.411992] vmap allocation for size 1052672 failed: use vmalloc=<size> to
increase size
[ 1.414895] pci-host-generic 4010000000.pcie: ECAM ioremap failed
[ 1.427472] pci-host-generic: probe of 4010000000.pcie failed with error -12
Eric Auger (2):
hw/arm/virt: Add a new 256MB ECAM region
hw/arm/virt: Add virt-3.0 machine type
hw/arm/virt-acpi-build.c | 21 +++++++++++++--------
hw/arm/virt.c | 43 ++++++++++++++++++++++++++++++++++++-------
include/hw/arm/virt.h | 3 +++
3 files changed, 52 insertions(+), 15 deletions(-)
--
2.5.5
- [Qemu-devel] [PATCH 0/2] ARM virt: Support up to 256 PCIe buses,
Eric Auger <=
[Qemu-devel] [PATCH 2/2] hw/arm/virt: Add virt-3.0 machine type, Eric Auger, 2018/05/30