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Thu, 24 Oct 2024 04:09:16 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Date: Thu, 24 Oct 2024 08:08:53 +0000 From: "Arnd Bergmann" To: =?UTF-8?Q?Alex_Benn=C3=A9e?= Cc: "Naresh Kamboju" , "open list" , "Linux ARM" , lkft-triage@lists.linaro.org, "Linux Regressions" , qemu-devel@nongnu.org, "Mark Brown" , "Catalin Marinas" , "Aishwarya TCV" , "Peter Maydell" , "Anders Roxell" , "Vincenzo Frascino" , "Thomas Gleixner" , "Geert Uytterhoeven" Message-Id: <16c7546e-ab87-4da7-bc36-14723675dba3@app.fastmail.com> In-Reply-To: <87bjzalhzc.fsf@draig.linaro.org> References: <4730e562-7d14-4f12-897a-e23783d094af@app.fastmail.com> <87bjzalhzc.fsf@draig.linaro.org> Subject: Re: Qemu v9.0.2: Boot failed qemu-arm with Linux next-20241017 tag. Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On Wed, Oct 23, 2024, at 19:47, Alex Benn=C3=A9e wrote: >> On Sun, Oct 20, 2024, at 17:39, Naresh Kamboju wrote: >> On non-LPAE arm32, this broke the existing behavior for >> large 32-bit memory sizes. The obvious fix is to change >> back the PAGE_MASK definition for 32-bit arm to a signed >> number. > > Agreed. However I think we were masking a calling issue that: > > /* Actual RAM size depends on initial RAM and device memory settin= gs */ > [VIRT_MEM] =3D { GiB, LEGACY_RAMLIMIT_BYTES }, > > And: > > -m 4G > > make no sense with no ARM_LPAE (which the kernel didn't have) but if y= ou > pass -machine virt,gic-version=3D3,highmem=3Doff (the default changed = awhile > back) you will get a warning: > > qemu-system-arm: Addressing limited to 32 bits, but memory exceeds i= t=20 > by 1073741824 bytes > > but I guess that didn't trigger for some reason before this patch? I did not look at the full log, but I don't think there is a problem between kernel and qemu, this is just a kernel regression that can happen on any real or virtual platform with a lot of memory. I would guess that "highmem=3Doff" was not even set here, so there was probably no warning, and you would still see the same kernel bug with qemu-system-aarch64 and its larger limit for highmem=3Doff. Arnd