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Shutemov" Cc: Andy Lutomirski , Sean Christopherson , Andrew Morton , Joerg Roedel , Ard Biesheuvel , Andi Kleen , Kuppuswamy Sathyanarayanan , David Rientjes , Vlastimil Babka , Tom Lendacky , Thomas Gleixner , Peter Zijlstra , Paolo Bonzini , Ingo Molnar , Varad Gautam , Dario Faggioli , Dave Hansen , Mike Rapoport , David Hildenbrand , marcelo.cerri@canonical.com, tim.gardner@canonical.com, khalid.elmously@canonical.com, philip.cox@canonical.com, x86@kernel.org, linux-mm@kvack.org, linux-coco@lists.linux.dev, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, Mike Rapoport Subject: Re: [PATCHv7 08/14] x86/mm: Reserve unaccepted memory bitmap Message-ID: References: <20220614120231.48165-1-kirill.shutemov@linux.intel.com> <20220614120231.48165-9-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20220614120231.48165-9-kirill.shutemov@linux.intel.com> ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1658826449; a=rsa-sha256; cv=none; b=lQewLUTD4hEjstxYXZ+FwQS/zoawgXkHH2zm6wTNdbWXXZId9LyteYmeDLiibZLLs67Zcr zcA65nAL1RNW3gUvrMuF718yTAIzHMTEpA4rsMzTInhbtGEEoCEzY1az6+YSRDVaiEAKOV CBiYFsKQWRM7/1cb0c+i++gz/RvPDSY= ARC-Authentication-Results: i=1; imf14.hostedemail.com; dkim=temperror ("DNS error when getting key") header.d=alien8.de header.s=dkim header.b=Yo9S+ums; dmarc=pass (policy=none) header.from=alien8.de; spf=pass (imf14.hostedemail.com: domain of bp@alien8.de designates 5.9.137.197 as permitted sender) smtp.mailfrom=bp@alien8.de ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1658826449; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=YvKICD3C3EkdneDF/q9lFJXRTdW4l8BIH7qdHQLIvtU=; b=0iaH3o34RzjOnVLHxijZa6Hu+DiJRM/vaymi0E3Xg/zt+VsOCDoWoPYrBbxDrXW9kiPuMI HfU15md1Vsc9dt46WuoOS6ru82C1gqxgzKbqvWX51PRg1/mLUDSpy394uuozk4eEhdkWKE EZVx8dzFteY+PDRlcyLwg0Zs9zvx8nc= Authentication-Results: imf14.hostedemail.com; dkim=temperror ("DNS error when getting key") header.d=alien8.de header.s=dkim header.b=Yo9S+ums; dmarc=pass (policy=none) header.from=alien8.de; spf=pass (imf14.hostedemail.com: domain of bp@alien8.de designates 5.9.137.197 as permitted sender) smtp.mailfrom=bp@alien8.de X-Stat-Signature: spsh4i7ee9onij7s14igpbr7urgxj5kc X-Rspamd-Queue-Id: 8E1261000CB X-Rspam-User: X-Rspamd-Server: rspam11 X-HE-Tag: 1658826444-384909 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Jun 14, 2022 at 03:02:25PM +0300, Kirill A. Shutemov wrote: > diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c > index f267205f2d5a..22d1fe48dcba 100644 > --- a/arch/x86/kernel/e820.c > +++ b/arch/x86/kernel/e820.c > @@ -1316,6 +1316,16 @@ void __init e820__memblock_setup(void) > int i; > u64 end; > > + /* Mark unaccepted memory bitmap reserved */ > + if (boot_params.unaccepted_memory) { > + unsigned long size; > + > + /* One bit per 2MB */ > + size = DIV_ROUND_UP(e820__end_of_ram_pfn() * PAGE_SIZE, > + PMD_SIZE * BITS_PER_BYTE); > + memblock_reserve(boot_params.unaccepted_memory, size); > + } > + Hmm, I don't like how this is dropped right in the middle of a unrelated function. You're adding arch/x86/mm/unaccepted_memory.c later. Why don't you put that chunk in a function there which is called by early_reserve_memory() which does exactly what you want - reserve memory early, before memblock allocations? Hmm. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette