From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DEA3B606A327 for ; Thu, 22 Oct 2026 13:37:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=0csXruEn; dkim=fail reason="signature verification failed" (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=dqS2EOF3 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type: MIME-Version:Message-ID:Date:References:In-Reply-To:Subject:To:From:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Unsubscribe-Post:List-Owner; bh=guiJ4aBhyGq0bfn00zMCo/CYuhvnJTZBmGSJvCGmgy4=; b=0csXruEnRtgyuO89r5jlsKX7CR MtW3M+dIV0GFXNgcxRedj4y9PFp6cixC07G2VqaFQH8YVm5lLaCR92aOW8Zp4edCjqmCYbl2nOP+I QKiDPQfU1Rl1mrpLWm35YMx7pG+0Lgq7GvA5p5xpuGhjrQj/Tt9RTM/ZFGq1IsXFGwbpqlRiDABBk 7moOtmp+EDOYU4nFN8XTqomexAxKP3nNSPS3Aujp9McRBJ755YGaEgkWqXHeB6SITLHbO7GGpbjXY EmF03wnItWCF7CCj3CTwRaapn16gQJin0qdKrf9uyN6oZToGw8MQYz51fvr7EjeM+Gl6/nWyVjrTB 4dv3b9LA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xJsys-0000000EDcK-1P8Z; Thu, 22 Oct 2026 13:37:18 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xJsyq-0000000EDbh-3JBW for kexec@lists.infradead.org; Thu, 22 Oct 2026 13:37:16 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 8A534402DA; Thu, 22 Oct 2026 13:37:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 00AEA1F000C1; Thu, 22 Oct 2026 13:37:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792676236; bh=guiJ4aBhyGq0bfn00zMCo/CYuhvnJTZBmGSJvCGmgy4=; h=From:To:Cc:Subject:In-Reply-To:References:Date; b=dqS2EOF3Z2QrUBNCDGMnS5+612xBithuHVMX6RMdNLt/jTiAZFsNXQxsIjmPT7wKs teOTq/3nlswzTSfmSx06jQ1I3xxmtH65Ou+qIxRapAkoupGwRbH1YqRi4qEVHou4FO jyrZsPWB4P/TagrkWN0MgXAuFuwiHrzvMZnZ6qpTwYH/Ot97qs+2b3GgX96tlMeIu7 W+Pz5xIa05G+td1gZPD3uDV7PC+BeDYDC4rzSjwNK+rfnwsmr5YdyGfgJuZ5k4tChs EAEkheql0xAzkPK5mnd0VVcBwPCHEN0qA/W0cmiIJw3gGI/4MFxIzmu90vum4iJogF FY+Y0HVKNb4HQ== From: Pratyush Yadav To: "Jose A. Perez de Azpillaga" Subject: Re: [RFC PATCH 0/2] memblock: keep reserve_mem regions out of KHO bootmem In-Reply-To: <20261021211058.83483-1-azpijr@gmail.com> (Jose A. Perez de Azpillaga's message of "Wed, 21 Oct 2026 23:10:44 +0200") References: <20261021211058.83483-1-azpijr@gmail.com> Date: Thu, 22 Oct 2026 15:37:12 +0200 Message-ID: <2vxzqzhhg8l3.fsf@kernel.org> User-Agent: Gnus/5.13 (Gnus v5.13) X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Tony Luck , Pasha Tatashin , linux-mm@kvack.org, Kees Cook , Changyuan Lyu , kexec@lists.infradead.org, linux-kernel@vger.kernel.org, Alexander Graf , Pratyush Yadav , Andrew Morton , Mike Rapoport Sender: "kexec" X-Spam-Status: No, score=-5.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_EF,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 On Wed, Oct 21 2026, Jose A. Perez de Azpillaga wrote: > On a KHO boot, a reserve_mem= region that can't be revived (new name, > size or alignment) can be allocated from KHO bootmem, which the next > kernel boots out of. With CONFIG_KEXEC_HANDOVER_DEBUG preserving it > fails; without it, the next kernel's memmap ends up on top of it. What's your use-case? Why are you adding new reserve_mem regions after cold boot? I'd rather avoid making purely theoretical fixes. [...] -- Regards, Pratyush Yadav