linux-kernel - Re: [PATCH v4 00/14] kexec: introduce Kexec HandOver (KHO)

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Message-ID: <Z7WJD6eBLuIRnLwk@kernel.org>
Date: Wed, 19 Feb 2025 09:32:31 +0200
From: Mike Rapoport <rppt@...nel.org>
To: RuiRui Yang <ruyang@...hat.com>
Cc: linux-kernel@...r.kernel.org, Alexander Graf <graf@...zon.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>,
	Anthony Yznaga <anthony.yznaga@...cle.com>,
	Arnd Bergmann <arnd@...db.de>, Ashish Kalra <ashish.kalra@....com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Borislav Petkov <bp@...en8.de>,
	Catalin Marinas <catalin.marinas@....com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Eric Biederman <ebiederm@...ssion.com>,
	Ingo Molnar <mingo@...hat.com>, James Gowans <jgowans@...zon.com>,
	Jonathan Corbet <corbet@....net>,
	Krzysztof Kozlowski <krzk@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Pasha Tatashin <pasha.tatashin@...een.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Pratyush Yadav <ptyadav@...zon.de>,
	Rob Herring <robh+dt@...nel.org>, Rob Herring <robh@...nel.org>,
	Saravana Kannan <saravanak@...gle.com>,
	Stanislav Kinsburskii <skinsburskii@...ux.microsoft.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tom Lendacky <thomas.lendacky@....com>,
	Usama Arif <usama.arif@...edance.com>,
	Will Deacon <will@...nel.org>, devicetree@...r.kernel.org,
	kexec@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
	linux-doc@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org
Subject: Re: [PATCH v4 00/14] kexec: introduce Kexec HandOver (KHO)

On Mon, Feb 17, 2025 at 11:19:45AM +0800, RuiRui Yang wrote:
> On Thu, 6 Feb 2025 at 21:34, Mike Rapoport <rppt@...nel.org> wrote:
> > == Limitations ==
> >
> > Currently KHO is only implemented for file based kexec. The kernel
> > interfaces in the patch set are already in place to support user space
> > kexec as well, but it is still not implemented it yet inside kexec tools.
> >
> 
> What architecture exactly does this KHO work fine?   Device Tree
> should be ok on arm*, x86 and power*, but how about s390?

KHO does not use device tree as the boot protocol, it uses FDT as a data
structure and adds architecture specific bits to the boot structures to
point to that data, very similar to how IMA_KEXEC works.

Currently KHO is implemented on arm64 and x86, but there is no fundamental
reason why it wouldn't work on any architecture that supports kexec.
 
> Thanks
> Dae
> 

-- 
Sincerely yours,
Mike.