linux-kernel - RE: commit 7ffb791423c7 breaks steam game

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Message-ID: <20250325101424.4478-1-spasswolf@web.de>
Date: Tue, 25 Mar 2025 11:14:23 +0100
From: Bert Karwatzki <spasswolf@....de>
To: Christian König <christian.koenig@....com>
Cc: Bert Karwatzki <spasswolf@....de>,
	Balbir Singh <balbirs@...dia.com>,
	Ingo Molnar <mingo@...nel.org>,
	Kees Cook <kees@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...nel.org>,
	Alex Deucher <alexander.deucher@....com>,
	linux-kernel@...r.kernel.org,
	amd-gfx@...ts.freedesktop.org
Subject: RE: commit 7ffb791423c7 breaks steam game

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.

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
1010000000-ffffffffff : PCI Bus 0000:00
  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
  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

Bert Karwatzki