On 12/01/18 09:01, Mike Galbraith wrote: > On Fri, 2018-01-12 at 07:40 +0100, Juergen Gross wrote: >> On 12/01/18 05:25, Mike Galbraith wrote: >>> Hi Juergen, >>> >>> Yesterday I wanted to test the RETPOLINE stuff in tip and tip-rt, but >>> discovered instead that my box had turned into a complete slug, not due >>> to incredible RETPOLINE overhead, rather because box had forgotten that >>> it had more than one CPU. I was going to leave it for the weekend, but >>> firing up gitk over morning java, I noticed the commits below, and sure >>> enough, that's what broke my box. Given other people's boxen work, >>> seems likely that the authors of the AMI BIOS in this box were a bit >>> more creative than usual. >> >> So I'm curious how this should be possible. > > Box is absolutely certain that it is. > >> Some questions: >> >> - which bootloader are you using? > > grub2, box is bog standard opensuse-42.3
And this is the problem. grub2 of opensuse 42.3 is _wrong_. It copies the setup_header in the size it knows of (last fiels is handover_offset), fills in some stuff, and then copies back 1024 bytes. So grub2 of openSUSE 42.3 is _not_ ready to accept extensions of bootparams. This is a major breakage of the protocol, I think. Juergen > >> - what does /sys/kernel/boot_params/version contain? > > 0x020e > >> - can you print the returned value of acpi_arch_get_root_pointer() >> in acpi_os_get_root_pointer() with the patches applied and report >> it, please? > > 0x115, which doesn't look all that useful to ACPI. > > [ 0.000000] ACPI: Early table checksum verification disabled > [ 0.000000] ACPI: MIKE pa = 0x115 > [ 0.000000] ACPI: 0x0000000000000115 000000 (v00 > 00000000 00000000) > [ 0.000000] Reserving 132MB of low memory at 3392MB for crashkernel > (System low RAM: 3556MB) > [ 0.000000] Reserving 256MB of memory at 16608MB for crashkernel (System > RAM: 16340MB) > [ 0.000000] tsc: Fast TSC calibration using PIT > [ 0.000000] Zone ranges: > [ 0.000000] DMA [mem 0x0000000000001000-0x0000000000ffffff] > [ 0.000000] DMA32 [mem 0x0000000001000000-0x00000000ffffffff] > [ 0.000000] Normal [mem 0x0000000100000000-0x000000041effffff] > [ 0.000000] Movable zone start for each node > [ 0.000000] Early memory node ranges > [ 0.000000] node 0: [mem 0x0000000000001000-0x0000000000057fff] > [ 0.000000] node 0: [mem 0x0000000000059000-0x000000000009dfff] > [ 0.000000] node 0: [mem 0x0000000000100000-0x00000000d0443fff] > [ 0.000000] node 0: [mem 0x00000000d044b000-0x00000000d0889fff] > [ 0.000000] node 0: [mem 0x00000000d0b4b000-0x00000000de787fff] > [ 0.000000] node 0: [mem 0x00000000defff000-0x00000000deffffff] > [ 0.000000] node 0: [mem 0x0000000100000000-0x000000041effffff] > [ 0.000000] Initmem setup node 0 [mem > 0x0000000000001000-0x000000041effffff] > [ 0.000000] On node 0 totalpages: 4183133 > [ 0.000000] DMA zone: 64 pages used for memmap > [ 0.000000] DMA zone: 21 pages reserved > [ 0.000000] DMA zone: 3996 pages, LIFO batch:0 > [ 0.000000] DMA32 zone: 14164 pages used for memmap > [ 0.000000] DMA32 zone: 906433 pages, LIFO batch:31 > [ 0.000000] Normal zone: 51136 pages used for memmap > [ 0.000000] Normal zone: 3272704 pages, LIFO batch:31 > [ 0.000000] Reserved but unavailable: 99 pages > [ 0.000000] tboot: non-0 tboot_addr but it is not of type > E820_TYPE_RESERVED > [ 0.000000] smpboot: Boot CPU (id 0) not listed by BIOS > [ 0.000000] smpboot: Allowing 1 CPUs, 0 hotplug CPUs > [ 0.000000] e820: [mem 0xdf000000-0xf7ffffff] available for PCI devices > [ 0.000000] Booting paravirtualized kernel on bare hardware > [ 0.000000] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: > 0xffffffff, max_idle_ns: 7645519600211568 ns > [ 0.000000] setup_percpu: NR_CPUS:8 nr_cpumask_bits:8 nr_cpu_ids:1 > nr_node_ids:1 > [ 0.000000] percpu: Embedded 43 pages/cpu @ (ptrval) s135896 r8192 > d32040 u2097152 > [ 0.000000] pcpu-alloc: s135896 r8192 d32040 u2097152 alloc=1*2097152 > [ 0.000000] pcpu-alloc: [0] 0 >
