Am 25.03.25 um 11:14 schrieb Bert Karwatzki: > My /proc/iomem contans two memory areas of 8G size which are > belonging to PCI 0000:03:00.0, one of the is the BAR reported by dmesg > [ 0.312692] [ T1] pci 0000:03:00.0: BAR 0 [mem 0xfc00000000-0xfdffffffff > 64bit pref]
> the other one is "afe00000000-affffffffff : 0000:03:00.0" (in the case > without nokaslr) which shifts > to "3ffe00000000-3fffffffffff : 0000:03:00.0" in the case with nokaslr. You need to figure out where that stuff is coming from. See below for another extremely odd thing. > > Here's /proc/iomem in the case without nokaslr: > 00000000-00000fff : Reserved > 00001000-0009ffff : System RAM > 000a0000-000fffff : Reserved > 000a0000-000dffff : PCI Bus 0000:00 > 000f0000-000fffff : System ROM > 00100000-09bfefff : System RAM > 09bff000-0a000fff : Reserved > 0a001000-0a1fffff : System RAM > 0a200000-0a20efff : ACPI Non-volatile Storage > 0a20f000-e62edfff : System RAM > e62ee000-e63e1fff : Reserved > e63e2000-e87cafff : System RAM > e87cb000-e87cbfff : Reserved > e87cc000-e9e1ffff : System RAM > e9e20000-eb33efff : Reserved > eb31e000-eb321fff : MSFT0101:00 > eb322000-eb325fff : MSFT0101:00 > eb33f000-eb39efff : ACPI Tables > eb39f000-eb556fff : ACPI Non-volatile Storage > eb557000-ed1fefff : Reserved > ed1ff000-edffffff : System RAM > ee000000-efffffff : Reserved > f0000000-fcffffff : PCI Bus 0000:00 > f0000000-f7ffffff : PCI ECAM 0000 [bus 00-7f] > f0000000-f7ffffff : pnp 00:00 > fc500000-fc9fffff : PCI Bus 0000:08 > fc500000-fc5fffff : 0000:08:00.7 > fc500000-fc5fffff : pcie_mp2_amd > fc600000-fc6fffff : 0000:08:00.4 > fc600000-fc6fffff : xhci-hcd > fc700000-fc7fffff : 0000:08:00.3 > fc700000-fc7fffff : xhci-hcd > fc800000-fc8fffff : 0000:08:00.2 > fc800000-fc8fffff : ccp > fc900000-fc97ffff : 0000:08:00.0 > fc980000-fc9bffff : 0000:08:00.5 > fc980000-fc9bffff : AMD ACP3x audio > fc980000-fc990200 : acp_pdm_iomem > fc9c0000-fc9c7fff : 0000:08:00.6 > fc9c0000-fc9c7fff : ICH HD audio > fc9c8000-fc9cbfff : 0000:08:00.1 > fc9c8000-fc9cbfff : ICH HD audio > fc9cc000-fc9cdfff : 0000:08:00.7 > fc9ce000-fc9cffff : 0000:08:00.2 > fc9ce000-fc9cffff : ccp > fca00000-fccfffff : PCI Bus 0000:01 > fca00000-fcbfffff : PCI Bus 0000:02 > fca00000-fcbfffff : PCI Bus 0000:03 > fca00000-fcafffff : 0000:03:00.0 > fcb00000-fcb1ffff : 0000:03:00.0 > fcb20000-fcb23fff : 0000:03:00.1 > fcb20000-fcb23fff : ICH HD audio > fcc00000-fcc03fff : 0000:01:00.0 > fcd00000-fcdfffff : PCI Bus 0000:07 > fcd00000-fcd03fff : 0000:07:00.0 > fcd00000-fcd03fff : nvme > fce00000-fcefffff : PCI Bus 0000:06 > fce00000-fce03fff : 0000:06:00.0 > fce00000-fce03fff : nvme > fcf00000-fcffffff : PCI Bus 0000:05 > fcf00000-fcf03fff : 0000:05:00.0 > fcf04000-fcf04fff : 0000:05:00.0 > fcf04000-fcf04fff : r8169 > fd300000-fd37ffff : amd_iommu > fec00000-fec003ff : IOAPIC 0 > fec01000-fec013ff : IOAPIC 1 > fec10000-fec10fff : Reserved > fec10000-fec10fff : pnp 00:04 > fed00000-fed00fff : Reserved > fed00000-fed003ff : HPET 0 > fed00000-fed003ff : PNP0103:00 > fed40000-fed44fff : Reserved > fed80000-fed8ffff : Reserved > fed81200-fed812ff : AMDI0030:00 > fed81500-fed818ff : AMDI0030:00 > fed81500-fed818ff : AMDI0030:00 AMDI0030:00 > fedc0000-fedc0fff : pnp 00:04 > fedc4000-fedc9fff : Reserved > fedc5000-fedc5fff : AMDI0010:03 > fedc5000-fedc5fff : AMDI0010:03 AMDI0010:03 > fedcc000-fedcefff : Reserved > fedd5000-fedd5fff : Reserved > fee00000-fee00fff : pnp 00:04 > ff000000-ffffffff : pnp 00:04 > 100000000-fee2fffff : System RAM > 825600000-8261fa1b1 : Kernel code > 826200000-82663dfff : Kernel rodata > 826800000-82692ef3f : Kernel data > 826eaf000-826ffffff : Kernel bss > fee300000-100fffffff : Reserved First it says that this range is reserved. > 1010000000-ffffffffff : PCI Bus 0000:00 And this range here used for the PCI Bus. > fc00000000-fe0fffffff : PCI Bus 0000:01 > fc00000000-fe0fffffff : PCI Bus 0000:02 > fc00000000-fe0fffffff : PCI Bus 0000:03 > fc00000000-fdffffffff : 0000:03:00.0 This is the usual BAR reported > by dmesg (and lspci -vv) > fe00000000-fe0fffffff : 0000:03:00.0 And then it says that the PCIe devices are inside the reserved range. > fe20000000-fe301fffff : PCI Bus 0000:08 > fe20000000-fe2fffffff : 0000:08:00.0 > fe30000000-fe301fffff : 0000:08:00.0 > fe30300000-fe304fffff : PCI Bus 0000:04 > fe30300000-fe303fffff : 0000:04:00.0 > fe30300000-fe303fffff : 0000:04:00.0 > fe30400000-fe30403fff : 0000:04:00.0 > fe30404000-fe30404fff : 0000:04:00.0 > afe00000000-affffffffff : 0000:03:00.0 This is the memory which shifts with > nokaslr To be honest that looks like a broken ACPI table to me, but it doesn't explain why this range here shifts when activating/deactivating nokaslr. Do we have some option to enable printing when ranges are added to the iomem reservation? If yes than we should probably do that and take a look at the dmesg again. Regards, Christian. > > Bert Karwatzki
