linux-kernel - Re: [PATCH 05/11] x86: remove HIGHMEM64G support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Z_om0KMBqtbq7g0_@gmail.com>
Date: Sat, 12 Apr 2025 10:39:44 +0200
From: Ingo Molnar <mingo@...nel.org>
To: Dave Hansen <dave.hansen@...el.com>
Cc: Arnd Bergmann <arnd@...nel.org>, linux-kernel@...r.kernel.org,
	x86@...nel.org, Arnd Bergmann <arnd@...db.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andy Shevchenko <andy@...nel.org>,
	Matthew Wilcox <willy@...radead.org>,
	Sean Christopherson <seanjc@...gle.com>,
	Davide Ciminaghi <ciminaghi@...dd.com>,
	Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
	Mike Rapoport <rppt@...nel.org>
Subject: Re: [PATCH 05/11] x86: remove HIGHMEM64G support


* Dave Hansen <dave.hansen@...el.com> wrote:

> Has anyone run into any problems on 6.15-rc1 with this stuff?
> 
> 0xf75fe000 is the mem_map[] entry for the first page >4GB. It 
> obviously wasn't allocated, thus the oops. Looks like the memblock 
> for the >4GB memory didn't get removed although the pgdats seem 
> correct.
> 
> I'll dig into it some more. Just wanted to make sure there wasn't a 
> fix out there already.

Not that I'm aware of.

> The way I'm triggering this is booting qemu with a 32-bit PAE kernel, 
> and "-m 4096" (or more).

That's a new regression indeed.

Thanks,

	Ingo