linux-kernel - Re: [PATCH v7 1/3] efi/x86: Fix EFI memory map corruption with kexec

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Message-ID: <20240604094358.GBZl7h3otTCYJ5rkkt@fat_crate.local>
Date: Tue, 4 Jun 2024 11:43:58 +0200
From: Borislav Petkov <bp@...en8.de>
To: Dave Young <dyoung@...hat.com>
Cc: Mike Rapoport <rppt@...nel.org>, "Kalra, Ashish" <ashish.kalra@....com>,
	tglx@...utronix.de, mingo@...hat.com, dave.hansen@...ux.intel.com,
	x86@...nel.org, rafael@...nel.org, hpa@...or.com,
	peterz@...radead.org, adrian.hunter@...el.com,
	sathyanarayanan.kuppuswamy@...ux.intel.com, jun.nakajima@...el.com,
	rick.p.edgecombe@...el.com, thomas.lendacky@....com,
	michael.roth@....com, seanjc@...gle.com, kai.huang@...el.com,
	bhe@...hat.com, kirill.shutemov@...ux.intel.com, bdas@...hat.com,
	vkuznets@...hat.com, dionnaglaze@...gle.com, anisinha@...hat.com,
	jroedel@...e.de, ardb@...nel.org, kexec@...ts.infradead.org,
	linux-coco@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 1/3] efi/x86: Fix EFI memory map corruption with kexec

On Tue, Jun 04, 2024 at 09:23:58AM +0800, Dave Young wrote:
> kexec_in_progress is only for checking if this is in a reboot (kexec) code path.
> But eif_mem_reserve is only called during the boot time so checking
> kexec_in_progress is meaningless here.
> current_kernel_is_booted_via_kexec != is_rebooting_with_kexec

That's exactly what I wanna check: whether this is a kexec-ed kernel. Or
is there a better helper for that?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette