Hi Jiahui, I noticed the PCIe expander bridge + PCIe root port does not work with a 64kB page guest. One hits a kernel BUG at mm/vmalloc.c:96 (BUG_ON(!pte_none(*pte));)! This happens with an upstream guest.
I understand this happens on pci_remap_iospace when handling the Io16 regions below. Wonder if the edk2 code could be the source (I saw you write both the edk2 and the qemu part [edk2-devel] [PATCH v2 0/4] Add extra pci roots support for Arm). Please could give me a hand? Best Regards Eric Sample qemu cmd options: -device pxb-pcie,bus_nr=4,id=bridge,bus=pcie.0 \ -device pcie-root-port,bus=bridge,chassis=4,id=pcie.11 \ -device virtio-net-pci,bus=pcie.11,netdev=nic0,mac=6a:f5:10:b1:3d:d2 -netdev tap,id=nic0,script=/home/augere/TEST/SCRIPTS/qemu-ifup,downscript=/home/augere/TEST/SCRIPTS/qemu-ifdown [ 2.867734] ACPI: PCI Root Bridge [PCFE] (domain 0000 [bus fe-ff]) [ 2.869339] acpi PNP0A08:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI EDR HPX-Type3] [ 2.871405] acpi PNP0A08:00: _OSC: platform does not support [LTR DPC] [ 2.873226] acpi PNP0A08:00: _OSC: OS now controls [PCIeHotplug PME AER PCIeCapability] [ 2.875609] acpi PNP0A08:00: ECAM area [mem 0x401fe00000-0x401fffffff] reserved by PNP0C02:00 [ 2.877830] acpi PNP0A08:00: ECAM at [mem 0x401fe00000-0x401fffffff] for [bus fe-ff] phys_addr=0x3eff3000 [ 2.884036] ------------[ cut here ]------------ [ 2.885249] kernel BUG at mm/vmalloc.c:96! [ 2.886322] Internal error: Oops - BUG: 0 [#1] SMP [ 2.887560] Modules linked in: [ 2.888352] CPU: 7 PID: 1 Comm: swapper/0 Not tainted 5.13.0-rc6-guest-64K+ #57 [ 2.890216] Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015 [ 2.891983] pstate: 80400005 (Nzcv daif +PAN -UAO -TCO BTYPE=--) [ 2.893519] pc : vmap_range+0x1d8/0x208 [ 2.894600] lr : vmap_range+0x38/0x208 [ 2.895615] sp : fffffe0012c2f7f0 [ 2.896517] x29: fffffe0012c2f7f0 x28: fffffffefe800000 x27: fffffffefe801000 [ 2.898437] x26: ffffffff20070000 x25: 00000001407f0000 x24: 0140000000000000 [ 2.900357] x23: fffffe001134ffb8 x22: 000000000000003f x21: 0068000000000717 [ 2.902284] x20: 000000003eff3000 x19: fffffffefe801000 x18: 0000000000000010 [ 2.904236] x17: 0000000000000000 x16: 0000000000000001 x15: ffffffffffffffff [ 2.906157] x14: 695f70616d65725f x13: 696370202a2a2a2a x12: fffffe0011c77150 [ 2.908084] x11: 0000000000000003 x10: fffffe0011bb7110 x9 : fffffe0010d33ad4 [ 2.909996] x8 : 00000000000bffe8 x7 : c0000000ffff7fff x6 : 0000000000000001 [ 2.911323] x5 : 0000000000000000 x4 : 000000003eff0000 x3 : 0000000000001ff7 [ 2.912631] x2 : 0040000000000001 x1 : fffffc07f4080038 x0 : fffffc07ffbecdc0 [ 2.913951] Call trace: [ 2.914398] vmap_range+0x1d8/0x208 [ 2.915363] ioremap_page_range+0x20/0x30 [ 2.916453] pci_remap_iospace+0xcc/0xf0 [ 2.917519] acpi_pci_probe_root_resources+0x244/0x268 [ 2.918907] pci_acpi_root_prepare_resources+0x28/0xc8 [ 2.920281] acpi_pci_root_create+0x9c/0x2f8 [ 2.921443] pci_acpi_scan_root+0x14c/0x230 [ 2.922574] acpi_pci_root_add+0x268/0x5c0 [ 2.923710] acpi_bus_attach+0x15c/0x2c0 [ 2.924794] acpi_bus_attach+0x9c/0x2c0 [ 2.925833] acpi_bus_attach+0x9c/0x2c0 [ 2.926881] acpi_bus_scan+0x64/0x118 [ 2.927875] acpi_scan_init+0x10c/0x25c [ 2.928922] acpi_init+0x3e8/0x458 [ 2.929847] do_one_initcall+0x54/0x268 [ 2.930879] kernel_init_freeable+0x290/0x344 [ 2.932068] kernel_init+0x1c/0x128 [ 2.933017] ret_from_fork+0x10/0x18 [ 2.934005] Code: a90687e2 97f518e5 a94687e2 17ffffe4 (d4210000) [ 2.935673] ---[ end trace 1d687ce361e3e7ca ]--- [ 2.936922] Kernel panic - not syncing: Oops - BUG: Fatal exception [ 2.938611] SMP: stopping secondary CPUs [ 2.939760] ---[ end Kernel panic - not syncing: Oops - BUG: Fatal exception ]--- At EDK2 level I have: PciBus: Resource Map for Root Bridge PciRoot(0x0)^M Type = Io16; Base = 0x0; Length = 0x3000; Alignment = 0xFFF^M Base = 0x0; Length = 0x200; Alignment = 0xFFF; Owner = PPB [00|02|02:**]^M Base = 0x1000; Length = 0x200; Alignment = 0xFFF; Owner = PPB [00|02|01:**]^M Base = 0x2000; Length = 0x200; Alignment = 0xFFF; Owner = PPB [00|02|00:**]^M Type = Mem32; Base = 0x10000000; Length = 0x700000; Alignment = 0x1FFFFF^M Base = 0x10000000; Length = 0x200000; Alignment = 0x1FFFFF; Owner = PPB [00|02|02:**]^M Base = 0x10200000; Length = 0x200000; Alignment = 0x1FFFFF; Owner = PPB [00|02|01:**]^M Base = 0x10400000; Length = 0x200000; Alignment = 0x1FFFFF; Owner = PPB [00|02|00:**]^M Base = 0x10600000; Length = 0x1000; Alignment = 0xFFF; Owner = PPB [00|02|02:10]^M Base = 0x10601000; Length = 0x1000; Alignment = 0xFFF; Owner = PPB [00|02|01:10]^M Base = 0x10602000; Length = 0x1000; Alignment = 0xFFF; Owner = PPB [00|02|00:10]^M Type = Mem64; Base = 0x8000000000; Length = 0x200000; Alignment = 0xFFFFF^M Base = 0x8000000000; Length = 0x100000; Alignment = 0xFFFFF; Owner = PPB [00|02|01:**]; Type = PMem64^M Base = 0x8000100000; Length = 0x100000; Alignment = 0xFFFFF; Owner = PPB [00|02|02:**]; Type = PMem64^M PciBus: Resource Map for Root Bridge PciRoot(0x4)^M Type = Io16; Base = 0x3000; Length = 0x1000; Alignment = 0xFFF^M Base = 0x3000; Length = 0x200; Alignment = 0xFFF; Owner = PPB [04|00|00:**]^M Type = Mem32; Base = 0x10800000; Length = 0x300000; Alignment = 0x1FFFFF^M Base = 0x10800000; Length = 0x200000; Alignment = 0x1FFFFF; Owner = PPB [04|00|00:**]^M Base = 0x10A00000; Length = 0x1000; Alignment = 0xFFF; Owner = PPB [04|00|00:10]^M ^M PciBus: Resource Map for Bridge [04|00|00]^M Type = Io16; Base = 0x3000; Length = 0x200; Alignment = 0xFFF^M Base = Padding; Length = 0x200; Alignment = 0x1FF^M Type = Mem32; Base = 0x10800000; Length = 0x200000; Alignment = 0x1FFFFF^M Base = Padding; Length = 0x200000; Alignment = 0x1FFFFF^M Type = Mem32; Base = 0x10A00000; Length = 0x1000; Alignment = 0xFFF^M
