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How did you check if nokaslr is being >>>> recognized, is it via looking up dmesg? >>>> >>> When I boot with nokaslr I get the following messages in dmesg >>> [ T0] Unknown kernel command line parameters "nokaslr >>> BOOT_IMAGE=/boot/vmlinuz-6.14.0-rc5-next-20250307-master", will be passed to >>> user space. >>> >>> This also happens when I use the debian kernel with standard .config >> >> That is quite strange, I can see nokaslr handling in choose_random_location() in >> arch/x86/boot/compressed/kaslr.c (which depends on CONFIG_RANDOMIZE_BASE) >> >> Thanks, >> Balbir > > The command line parameter nokaslr does actually work, I tested that by booting > the kernel with and without nokaslr and checked /proc/iomem for the physical > address of the kernel. With nokalsr it's always at 0x1200000. > > The warning message in the code > if (cmdline_find_option_bool("nokaslr")) { > warn("KASLR disabled: 'nokaslr' on cmdline."); > return; > } > on the other hand is not shown, because warn is basically __putstr() which > outputs to the serial console and the screen, not the log buffer (Which we do > not have this early in boot anyway, I assume). > > So with this solved I tested stellaris with a kernel without CONFIG_PCI_P2PDMA > and nokaslr and found the same buggy behaviour (i.e. laggy input while stellaris > is running). > Thanks, the system/game is not working correctly accessing memory at 64 TiB I am beginning to wonder what your physical address bits are set to? I can't figure out from lspci, the capabilities of the iommu on your laptop Could you please share your full dmesg/lspci before and after the patch/nokaslr command line. Here is the what I know so far and based on some search I did, I could find your laptop might have a CPU like this one https://openbenchmarking.org/s/AMD+Ryzen+7+3750H It has 43 bits of physical address and sev supported and IIRC sev can change the amount of physical memory accessible, but I am surprised to see that 0xaff... which is the 10TiB range is accessible (44 bits) and the 64 TiB may not be. I am keen to know if the system works or is it just the game that is sluggiesh? Does graphics work in general, do other games work? The arch/x86/mm code assumes we have 46 or 52 bits of physically addressable bits. There are experts who can correct me if I missed anything in my analysis. It seems like kaslr has been hiding the issue that exists on your laptop. Balbir PS: We could try some other experiments once we have the full dmesg and also get help from other experts.