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Date: Sat, 12 Apr 2025 10:39:44 +0200
From: Ingo Molnar <mingo@kernel.org>
To: Dave Hansen <dave.hansen@intel.com>
Cc: Arnd Bergmann <arnd@kernel.org>, linux-kernel@vger.kernel.org,
	x86@kernel.org, Arnd Bergmann <arnd@arndb.de>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	"H. Peter Anvin" <hpa@zytor.com>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Andy Shevchenko <andy@kernel.org>,
	Matthew Wilcox <willy@infradead.org>,
	Sean Christopherson <seanjc@google.com>,
	Davide Ciminaghi <ciminaghi@gnudd.com>,
	Paolo Bonzini <pbonzini@redhat.com>, kvm@vger.kernel.org,
	Mike Rapoport <rppt@kernel.org>
Subject: Re: [PATCH 05/11] x86: remove HIGHMEM64G support
Message-ID: <Z_om0KMBqtbq7g0_@gmail.com>
References: <20241204103042.1904639-1-arnd@kernel.org>
 <20241204103042.1904639-6-arnd@kernel.org>
 <08b63835-121d-4adc-8f03-e68f0b0cabdf@intel.com>
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* Dave Hansen <dave.hansen@intel.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