Re: [PATCH 0/8] Add high MMIO support with GPEX host bridge

[Bibo Mao]

On 2025/9/15 下午5:11, Jonathan Cameron wrote:

On Mon, 15 Sep 2025 15:19:38 +0800
Bibo Mao <maob...@loongson.cn> wrote:

On LoongArch Virt Machine, MMIO region with GPEX host bridge is
0x40000000 -- 0x7FFFFFFF. The total size is 1G bytes and it is enough
for emulated virtio devices basically.

However on some conditions such as hostmem is added with virtio-gpu
device with -device virtio-gpu-gl,hostmem=4G. The PCIE MMIO region is
not enough, 64-bit high MMIO region is required.

Here property highmem-mmio is added on virt machine to add 64-bit high
MMIO region supported. With high MMIO region added, it is not compatible
with old machine, so property highmem-mmio is disabled by default.

Trivial request. Please mention loongarch in the cover letter title.
It will help people make a quick decision on whether they should be looking
at the thread or not.

Thanks for reminder, I notice this when it is sent out.
Will be cautious about this in future.

Regards
Bibo Mao

Jonathan

Bibo Mao (8):
   target/loongarch: Add phys_bits in CPULoongArchState
   hw/loongarch/virt: Add field ram_end in LoongArchVirtMachineState
   hw/loongarch/virt: Add field gpx in LoongArchVirtMachineState
   hw/loongarch/virt: Get irq number from gpex config info
   hw/loongarch/virt: Get PCI info from gpex config info
   hw/loongarch/virt: Add property highmem_mmio with virt machine
   hw/loongarch/virt: Add high MMIO support with GPEX host
   hw/loongarch/virt: Add property highmem-mmio-size with virt machine

  hw/loongarch/virt-acpi-build.c |  17 +---
  hw/loongarch/virt-fdt-build.c  |  43 +++++++---
  hw/loongarch/virt.c            | 152 ++++++++++++++++++++++++++++++---
  include/hw/loongarch/virt.h    |   5 +-
  target/loongarch/cpu.c         |  13 +--
  target/loongarch/cpu.h         |   2 +
  6 files changed, 186 insertions(+), 46 deletions(-)


base-commit: 190d5d7fd725ff754f94e8e0cbfb69f279c82b5d