在 2025/10/17 下午2:45, Bibo Mao 写道:
> 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.
>
> Like other architectures, 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.
>
> ---
> v2 ... v3:
> 1. Fix high MMIO space access failure with UEFI BIOS on TCG mode, since
> there is 1:1 identified mapping with UEFI bios, virtual address
> space is 47 bit actually with PGDL root page table, where fail to
> setup mapping table for 48 bit physical address. Here set physical
> address width smaller than virtual address width.
>
> v1 ... v2:
> 1. Solve some code conflict and refresh the patch on the latest version.
> 2. Base address of GPEX high MMIO starts from end of max physical
> address region rather than adjacent with DRAM, since it is fixed with
> the previous method.
> ---
> Bibo Mao (7):
> hw/loongarch/virt: Add field ram_end in LoongArchVirtMachineState
> hw/loongarch/virt: Add field gpex 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 | 175 ++++++++++++++++++++++++++++++---
> include/hw/loongarch/virt.h | 5 +-
> 4 files changed, 200 insertions(+), 40 deletions(-)
>
>
> base-commit: 18f6f30b0089b470f3e737637a86dfb81ebd6eae
HI, this series need rebase .
Reviewed-by: Song Gao <gaosong@loongson.cn>
Thanks.
Song Gao