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 /pcie@10000000 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
