Re: [PATCH v6 1/2] x86/kexec: Build identity mapping for EFI systab and ACPI tables

From: Baoquan He
Date: Mon May 13 2019 - 04:03:47 EST

On 05/13/19 at 09:50am, Borislav Petkov wrote:
> On Mon, May 13, 2019 at 03:32:54PM +0800, Baoquan He wrote:
> > This is a critical bug which breaks memory hotplug,
> Please concentrate and stop the blabla:
> 36f0c423552d ("x86/boot: Disable RSDP parsing temporarily")
> already explains what the deal is. This code was *purposefully* disabled
> because we ran out of time and it broke a couple of machines. Don't make
> me repeat all that - you were on CC on *all* threads and messages!
> So we're going to try it again this cycle and if there's no fallout, it
> will go upstream. If not, it will have to be fixed. The usual thing.
> And I don't care if Kairui's patch fixes this one problem - judging by
> the fragility of this whole thing, it should be hammered on one more
> cycle on as many boxes as possible to make sure there's no other SNAFUs.
> So go test it on more machines instead. I've pushed it here:

Pingfan has got a machine to reproduce the kexec breakage issue, and
applying these two patches fix it. He planned to paste the test result.
I will ask him to try this branch if he has time, or I can get his
machine to test.

Junichi, also have a try on Boris's branch in NEC's test environment?