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Meltdown – Spectre - Was: kernel 4.4.0-108 / 16.04 LTS does not boot anymore


On Fri, 12 Jan 2018 17:04:00 +0100, robert rottermann wrote:
>On 12.01.2018 13:53, Gilles Gravier wrote:
>> A quick question to the OP... Is the machine an AMD machine (not
>> AMD64, I mean AMD processor versus Intel)?  
>
>it is a: Intel® Core� i5-2500 CPU @ 3.30GHz � 4

Actually I'm the OP of this thread ;). You messed up this thread, with
the original thread, but note, this thread was not in reply to the
original thread, it's a new opened thread. You could notice the
difference, if you let your MUA sort by thread.

To answer my request myself, unlikely there is an option "nopti" as
described by https://lwn.net/Articles/741878/, but there obviously is
the "nokaiser" boot option [1.2].

I don't have time to test if booting with or without "nokaiser" makes
a difference on performance, such SSD access, DSP load or what ever
else.

Regards,
Ralf

[1]
[1.1]
[root at archlinux moonstudio]# systemd-nspawn apt changelog linux-image-4.4.0.109-lowlatency 2>/dev/null | grep -B84 "linux (4.4.0-104.127)"
linux (4.4.0-109.132) xenial; urgency=low

  * linux: 4.4.0-109.132 -proposed tracker (LP: #1742252)

  * Kernel trace with xenial 4.4  (4.4.0-108.131, Candidate kernels for PTI fix)
    (LP: #1741934)
    - SAUCE: kaiser: fix perf crashes - fix to original commit

 -- Marcelo Henrique Cerri <marcelo.cerri at canonical.com>  Tue, 09 Jan 2018 15:56:26 -0200

linux (4.4.0-108.131) xenial; urgency=low

  * linux: 4.4.0-108.131 -proposed tracker (LP: #1741727)

  * CVE-2017-5754
    - x86/mm: Disable PCID on 32-bit kernels

 -- Marcelo Henrique Cerri <marcelo.cerri at canonical.com>  Sun, 07 Jan 2018 11:46:05 -0200

linux (4.4.0-107.130) xenial; urgency=low

  * linux: 4.4.0-107.130 -proposed tracker (LP: #1741643)

  * CVE-2017-5754
    - Revert "UBUNTU: SAUCE: arch/x86/entry/vdso: temporarily disable vdso"
    - KPTI: Report when enabled
    - x86, vdso, pvclock: Simplify and speed up the vdso pvclock reader
    - x86/vdso: Get pvclock data from the vvar VMA instead of the fixmap
    - x86/kasan: Clear kasan_zero_page after TLB flush
    - kaiser: Set _PAGE_NX only if supported

 -- Kleber Sacilotto de Souza <kleber.souza at canonical.com>  Sat, 06 Jan 2018 17:13:03 +0100

linux (4.4.0-106.129) xenial; urgency=low

  * linux: 4.4.0-106.129 -proposed tracker (LP: #1741528)

  * CVE-2017-5754
    - KAISER: Kernel Address Isolation
    - kaiser: merged update
    - kaiser: do not set _PAGE_NX on pgd_none
    - kaiser: stack map PAGE_SIZE at THREAD_SIZE-PAGE_SIZE
    - kaiser: fix build and FIXME in alloc_ldt_struct()
    - kaiser: KAISER depends on SMP
    - kaiser: fix regs to do_nmi() ifndef CONFIG_KAISER
    - kaiser: fix perf crashes
    - kaiser: ENOMEM if kaiser_pagetable_walk() NULL
    - kaiser: tidied up asm/kaiser.h somewhat
    - kaiser: tidied up kaiser_add/remove_mapping slightly
    - kaiser: kaiser_remove_mapping() move along the pgd
    - kaiser: cleanups while trying for gold link
    - kaiser: name that 0x1000 KAISER_SHADOW_PGD_OFFSET
    - kaiser: delete KAISER_REAL_SWITCH option
    - kaiser: vmstat show NR_KAISERTABLE as nr_overhead
    - x86/mm: Enable CR4.PCIDE on supported systems
    - x86/mm: Build arch/x86/mm/tlb.c even on !SMP
    - x86/mm, sched/core: Uninline switch_mm()
    - x86/mm: Add INVPCID helpers
    - x86/mm: If INVPCID is available, use it to flush global mappings
    - kaiser: enhanced by kernel and user PCIDs
    - kaiser: load_new_mm_cr3() let SWITCH_USER_CR3 flush user
    - kaiser: PCID 0 for kernel and 128 for user
    - kaiser: x86_cr3_pcid_noflush and x86_cr3_pcid_user
    - kaiser: paranoid_entry pass cr3 need to paranoid_exit
    - kaiser: _pgd_alloc() without __GFP_REPEAT to avoid stalls
    - kaiser: fix unlikely error in alloc_ldt_struct()
[1.2]
    - kaiser: add "nokaiser" boot option, using ALTERNATIVE
    - x86/kaiser: Rename and simplify X86_FEATURE_KAISER handling
    - x86/boot: Add early cmdline parsing for options with arguments
    - x86/kaiser: Check boottime cmdline params
    - kaiser: use ALTERNATIVE instead of x86_cr3_pcid_noflush
    - kaiser: drop is_atomic arg to kaiser_pagetable_walk()
    - kaiser: asm/tlbflush.h handle noPGE at lower level
    - kaiser: kaiser_flush_tlb_on_return_to_user() check PCID
    - x86/paravirt: Dont patch flush_tlb_single
    - x86/kaiser: Reenable PARAVIRT
    - kaiser: disabled on Xen PV
    - x86/kaiser: Move feature detection up
    - kvm: x86: fix RSM when PCID is non-zero
    - SAUCE: arch/x86/entry/vdso: temporarily disable vdso
    - [Config]: CONFIG_KAISER=y

 -- Kleber Sacilotto de Souza <kleber.souza at canonical.com>  Fri, 05 Jan 2018 19:53:41 +0100

linux (4.4.0-104.127) xenial; urgency=low