Hello, I'm running a x86 QEMU with Ubuntu. On this system we want to emulate a PCIe device which contains a large 32-bit BAR (2 GiB). This is not working and I get following error:
SeaBIOS (version rel-1.14.0-0-g155821a-20210629_105355-sharpie) BUILD: gcc: (GCC) 4.8.5 20150623 (Red Hat 4.8.5-36) binutils: version 2.27-34.base.el7 No Xen hypervisor found. Running on QEMU (q35) Running on KVM Found QEMU fw_cfg QEMU fw_cfg DMA interface supported qemu/e820: addr 0x0000000000000000 len 0x0000000080000000 [RAM] qemu/e820: addr 0x0000000100000000 len 0x0000000180000000 [RAM] Relocating init from 0x000d4de0 to 0x7ffa9420 (size 93008) Moving pm_base to 0x600 kvmclock: at 0xeb040 (msr 0x4b564d01) kvmclock: stable tsc, 2992 MHz CPU Mhz=2992 (kvmclock) === PCI bus & bridge init === PCI: pci_bios_init_bus_rec bus = 0x0 PCI: pci_bios_init_bus_rec bdf = 0x20 PCI: primary bus = 0x0 PCI: secondary bus = 0xff -> 0x1 PCI: pci_bios_init_bus_rec bus = 0x1 PCI: subordinate bus = 0x0 -> 0x1 === PCI device probing === Found 12 PCI devices (max PCI bus is 01) PCIe: using q35 mmconfig at 0xb0000000 === PCI new allocation pass #1 === PCI: check devices PCI: secondary bus 1 size 00000000 type io PCI: secondary bus 1 size 100000000 type mem PCI: secondary bus 1 size 100000000 type prefmem === PCI new allocation pass #2 === PCI: IO: c000 - c0ff PCI: 32: 00000000c0000000 - 00000000fec00000 PCI: out of 32bit address space I've had a look at the code and it seems that 32-bit BAR's have a limited memory region available (less than 1 GiB). Is there a possibility to use such large 32-bit BAR's in combination with SeaBios by e.g. mapping them in the higher memory region where 64-bit BAR's are mapped? Thanks in advance! Kind regards, Wannes
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