Re: [PATCH] x86/e820: discard high memory that can't be addressed by 32-bit systems

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To: Mike Rapoport <rppt@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>
Subject: Re: [PATCH] x86/e820: discard high memory that can't be addressed by 32-bit systems
From: Dave Hansen <dave.hansen@xxxxxxxxx>
Date: Fri, 18 Apr 2025 12:29:16 -0700
Cc: Nathan Chancellor <nathan@xxxxxxxxxx>, Andy Shevchenko <andy@xxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Davide Ciminaghi <ciminaghi@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Sean Christopherson <seanjc@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, kvm@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx
In-reply-to: <aAKnGbajVRKanGem@kernel.org>
References: <Z_rDdnlSs0rts3b9@gmail.com> <20250413080858.743221-1-rppt@kernel.org> <20250417162206.GA104424@ax162> <aAHyHuwbmhjWmDqc@gmail.com> <aAIU9LHAr_BGb5Jl@kernel.org> <aAJMmQKTglGc7N-K@gmail.com> <aAKnGbajVRKanGem@kernel.org>
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On 4/18/25 12:25, Mike Rapoport wrote:
>> So why don't we use max_pfn like your -v1 fix did IIRC?
> Dave didn't like max_pfn. I don't feel strongly about using max_pfn or
> skipping e820 ranges above 4G and not adding them to memblock.

I feel more strongly about fixing the bug than avoiding max_pfn. ;)

Going back to v1 is fine with me.

References:
- Re: [PATCH 05/11] x86: remove HIGHMEM64G support
  - From: Ingo Molnar
- [PATCH] x86/e820: discard high memory that can't be addressed by 32-bit systems
  - From: Mike Rapoport
- Re: [PATCH] x86/e820: discard high memory that can't be addressed by 32-bit systems
  - From: Nathan Chancellor
- Re: [PATCH] x86/e820: discard high memory that can't be addressed by 32-bit systems
  - From: Ingo Molnar
- Re: [PATCH] x86/e820: discard high memory that can't be addressed by 32-bit systems
  - From: Mike Rapoport
- Re: [PATCH] x86/e820: discard high memory that can't be addressed by 32-bit systems
  - From: Ingo Molnar
- Re: [PATCH] x86/e820: discard high memory that can't be addressed by 32-bit systems
  - From: Mike Rapoport

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