linux-kernel - Re: [REGRESSION] Platforms supporting SGX fail to kexec due to 96c6b8f212a ("memblock: report failures when memblock_can

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Date: Sun, 31 Dec 2023 09:26:22 +0200
From: Mike Rapoport <rppt@...nel.org>
To: Ashok Raj <ashok.raj@...el.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...el.com>,
	Ingo Molnar <mingo@...nel.org>, regressions@...ts.linux.dev,
	Song Shuai <songshuaishuai@...ylab.org>
Subject: Re: [REGRESSION] Platforms supporting SGX fail to kexec due to
 96c6b8f212a ("memblock: report failures when memblock_can_resize is not
 set")

Hi,

On Thu, Dec 28, 2023 at 04:33:49PM -0800, Ashok Raj wrote:
> Hi 
> 
> 96c6b8f212a ("memblock: report failures when memblock_can_resize is not set")
> 
> Causes kexec failure. Backing out this change, kexec succeeds. Symptom is
> it appears to hang, possibly hung at the panic. Although I have the
> earlyprintk enabled, I don't see any console messages when new kernel
> boots. 
> 
> Also tested turning off CONFIG_X86_SGX, the kernel with this commit
> included also kexec's fine.
> 
> Booting from warm/cold reset has no issues. Only kexec to new kernel with
> this change included and CONFIG_X86_SGX=y causes the kexec failure.

Can you add memblock=debug to the kernel command line and send logs for
normal boot and kexec with CONFIG_X86_SGX=y and e96c6b8f212a reverted?
 
> #regzbot introduced: 96c6b8f212a
> -- 
> Cheers,
> Ashok

-- 
Sincerely yours,
Mike.