Re: [PATCH v6 1/2] x86/kexec: Build identity mapping for EFI systab and ACPI tables
From: Ingo Molnar
Date: Tue May 14 2019 - 10:11:01 EST
* Dave Young <dyoung@xxxxxxxxxx> wrote:
> On 05/14/19 at 01:38pm, Peter Zijlstra wrote:
> > On Tue, May 14, 2019 at 04:48:41PM +0800, Dave Young wrote:
> > > > I did some tests on the laptop, thing is:
> > > > 1. apply the 3 patches (two you posted + Boris's revert commit 52b922c3d49c)
> > > > on latest Linus master branch, everything works fine.
> > > >
> > > > 2. build and test the tip/next-merge-window branch, kernel hangs early
> > > > without output, (both 1st boot and kexec boot)
> > >
> > > Update about 2. It should be not early rsdp related, I got the boot log
> > > Since can not reproduce with Linus master branch it may have been fixed.
> > Nothing was changed here since PTI.
> > > [ 0.685374][ T1] rcu: Hierarchical SRCU implementation.
> > > [ 0.686414][ T1] general protection fault: 0000 [#1] SMP PTI
> > > [ 0.687328][ T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.1.0-rc6+ #877
> > > [ 0.687328][ T1] Hardware name: LENOVO 4236NUC/4236NUC, BIOS 83ET82WW (1.52 ) 06/04/2018
> > > [ 0.687328][ T1] RIP: 0010:reserve_ds_buffers+0x34e/0x450
> > > [ 0.687328][ T1] Call Trace:
> > > [ 0.687328][ T1] ? hardlockup_detector_event_create+0x50/0x50
> > > [ 0.687328][ T1] x86_reserve_hardware+0x173/0x180
> > > [ 0.687328][ T1] x86_pmu_event_init+0x39/0x220
> > The DS buffers are special in that they're part of cpu_entrt_area. If
> > this comes apart it might mean your pagetables are dodgy.
> Hmm, it seems caused by some WIP branch patches, I suspect below:
> commit 124d6af5a5f559e516ed2c6ea857e889ed293b43
> x86/paravirt: Standardize 'insn_buff' variable names
This commit had a bug which I fixed - could you try the latest -tip?