linux-kernel - Re: [PATCH v4 13/14] memblock: Add KHO support for reserve

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Message-ID: <Z7WHY5RBJc9YxPPY@kernel.org>
Date: Wed, 19 Feb 2025 09:25:23 +0200
From: Mike Rapoport <rppt@...nel.org>
To: Wei Yang <richard.weiyang@...il.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 13/14] memblock: Add KHO support for reserve_mem

On Mon, Feb 17, 2025 at 04:04:48AM +0000, Wei Yang wrote:
> On Thu, Feb 06, 2025 at 03:27:53PM +0200, Mike Rapoport wrote:
> >From: Alexander Graf <graf@...zon.com>
> >
> >Linux has recently gained support for "reserve_mem": A mechanism to
> >allocate a region of memory early enough in boot that we can cross our
> >fingers and hope it stays at the same location during most boots, so we
> >can store for example ftrace buffers into it.
> >
> >Thanks to KASLR, we can never be really sure that "reserve_mem"
> >allocations are static across kexec. Let's teach it KHO awareness so
> >that it serializes its reservations on kexec exit and deserializes them
> >again on boot, preserving the exact same mapping across kexec.
> >
> >This is an example user for KHO in the KHO patch set to ensure we have
> >at least one (not very controversial) user in the tree before extending
> >KHO's use to more subsystems.
> >
> >Signed-off-by: Alexander Graf <graf@...zon.com>
> >Co-developed-by: Mike Rapoport (Microsoft) <rppt@...nel.org>
> >Signed-off-by: Mike Rapoport (Microsoft) <rppt@...nel.org>
> >---
> > mm/memblock.c | 131 ++++++++++++++++++++++++++++++++++++++++++++++++++
> > 1 file changed, 131 insertions(+)
> >
> >diff --git a/mm/memblock.c b/mm/memblock.c
> >index 84df96efca62..fdb08b60efc1 100644
> >--- a/mm/memblock.c
> >+++ b/mm/memblock.c
> >@@ -16,6 +16,9 @@
> > #include <linux/kmemleak.h>
> > #include <linux/seq_file.h>
> > #include <linux/memblock.h>
> >+#include <linux/kexec_handover.h>
> 
> Looks this one breaks the memblock test in tools/testing/memblock.
> 
> memblock.c:19:10: fatal error: linux/kexec_handover.h: No such file or directory
>    19 | #include <linux/kexec_handover.h>
>       |          ^~~~~~~~~~~~~~~~~~~~~~~~

Thanks, will fix.
 
> >+#include <linux/kexec.h>
> >+#include <linux/libfdt.h>
> > 
> 
> -- 
> Wei Yang
> Help you, Help me

-- 
Sincerely yours,
Mike.