Hi Jason, Apologies for the delay in testing. I'm seeing this problem when I try to boot on a t4240rdb: random: get_random_u64 called from .start_kernel+0x734/0x964 with crng_init=0 [8/973] clocksource: timebase: mask: 0xffffffffffffffff max_cycles: 0xa9210e89c, max_idle_ns: 440795203878 ns clocksource: timebase mult[15d17460] shift[24] registered Console: colour dummy device 80x25 pid_max: default: 32768 minimum: 301 Mount-cache hash table entries: 16384 (order: 5, 131072 bytes, linear) Mountpoint-cache hash table entries: 16384 (order: 5, 131072 bytes, linear) e6500 family performance monitor hardware support registered rcu: Hierarchical SRCU implementation. smp: Bringing up secondary CPUs ... Processor 2 is stuck. Processor 3 is stuck. Processor 4 is stuck. Processor 5 is stuck. Processor 6 is stuck. Processor 7 is stuck. Processor 8 is stuck. Processor 9 is stuck. Processor 10 is stuck. Processor 11 is stuck. Processor 12 is stuck. Processor 13 is stuck. Processor 14 is stuck. ... Processor 22 is stuck. Processor 23 is stuck. smp: Brought up 1 node, 2 CPUs Using standard scheduler topology devtmpfs: initialized clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns futex hash table entries: 8192 (order: 7, 524288 bytes, linear) NET: Registered protocol family 16 audit: initializing netlink subsys (disabled) audit: type=2000 audit(108.032:1): state=initialized audit_enabled=0 res=1 Machine: fsl,T4240RDB SoC family: QorIQ T4240 SoC ID: svr:0x82480020, Revision: 2.0 ... boot continues ... If I boot with nokaslr, all the CPUs come up with no issue. This is on top of powerpc/merge at 8299da600ad05b8aa0f15ec0f5f03bd40e37d6f0. If you'd like me to test any debug patches I can do that. I've attached my .config. Regards, Daniel
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.config
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> This is a try to implement KASLR for Freescale BookE64 which is based on > my earlier implementation for Freescale BookE32: > https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=131718&state=* > > The implementation for Freescale BookE64 is similar as BookE32. One > difference is that Freescale BookE64 set up a TLB mapping of 1G during > booting. Another difference is that ppc64 needs the kernel to be > 64K-aligned. So we can randomize the kernel in this 1G mapping and make > it 64K-aligned. This can save some code to creat another TLB map at > early boot. The disadvantage is that we only have about 1G/64K = 16384 > slots to put the kernel in. > > KERNELBASE > > 64K |--> kernel <--| > | | | > +--+--+--+ +--+--+--+--+--+--+--+--+--+ +--+--+ > | | | |....| | | | | | | | | |....| | | > +--+--+--+ +--+--+--+--+--+--+--+--+--+ +--+--+ > | | 1G > |-----> offset <-----| > > kernstart_virt_addr > > I'm not sure if the slot numbers is enough or the design has any > defects. If you have some better ideas, I would be happy to hear that. > > Thank you all. > > v4->v5: > Fix "-Werror=maybe-uninitialized" compile error. > Fix typo "similar as" -> "similar to". > v3->v4: > Do not define __kaslr_offset as a fixed symbol. Reference __run_at_load and > __kaslr_offset by symbol instead of magic offsets. > Use IS_ENABLED(CONFIG_PPC32) instead of #ifdef CONFIG_PPC32. > Change kaslr-booke32 to kaslr-booke in index.rst > Switch some instructions to 64-bit. > v2->v3: > Fix build error when KASLR is disabled. > v1->v2: > Add __kaslr_offset for the secondary cpu boot up. > > Jason Yan (6): > powerpc/fsl_booke/kaslr: refactor kaslr_legal_offset() and > kaslr_early_init() > powerpc/fsl_booke/64: introduce reloc_kernel_entry() helper > powerpc/fsl_booke/64: implement KASLR for fsl_booke64 > powerpc/fsl_booke/64: do not clear the BSS for the second pass > powerpc/fsl_booke/64: clear the original kernel if randomized > powerpc/fsl_booke/kaslr: rename kaslr-booke32.rst to kaslr-booke.rst > and add 64bit part > > Documentation/powerpc/index.rst | 2 +- > .../{kaslr-booke32.rst => kaslr-booke.rst} | 35 ++++++- > arch/powerpc/Kconfig | 2 +- > arch/powerpc/kernel/exceptions-64e.S | 23 +++++ > arch/powerpc/kernel/head_64.S | 13 +++ > arch/powerpc/kernel/setup_64.c | 3 + > arch/powerpc/mm/mmu_decl.h | 23 +++-- > arch/powerpc/mm/nohash/kaslr_booke.c | 91 +++++++++++++------ > 8 files changed, 147 insertions(+), 45 deletions(-) > rename Documentation/powerpc/{kaslr-booke32.rst => kaslr-booke.rst} (59%) > > -- > 2.17.2
