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Fri, 30 Jan 2026 10:59:11 -0800 (PST) MIME-Version: 1.0 References: <87ldhigyao.fsf@linaro.org> <87tsw59hwu.fsf@linaro.org> <87a4xvafmv.fsf@linaro.org> <874io39iuk.fsf@linaro.org> <87y0lf81yt.fsf@linaro.org> <87sebn7ymd.fsf@linaro.org> <87ms1v7xmh.fsf@linaro.org> In-Reply-To: <87ms1v7xmh.fsf@linaro.org> Date: Fri, 30 Jan 2026 18:59:00 +0000 X-Gm-Features: AZwV_Qj6bKfD6S8MwUf2sQSj14ibpn9J0ZxcMWVrhUy0VCBSQq8wyVPT_2K2Nys Message-ID: Subject: Re: gdb support for SME-without-SVE ? To: Thiago Jung Bauermann Cc: Luis , gdb@sourceware.org, Manos Pitsidianakis Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-BeenThere: gdb@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Gdb mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Peter Maydell via Gdb Reply-To: Peter Maydell Errors-To: gdb-bounces~public-inbox=simark.ca@sourceware.org Sender: "Gdb" On Fri, 30 Jan 2026 at 18:40, Thiago Jung Bauermann wrote: > > Peter Maydell writes: > > > On Fri, 30 Jan 2026 at 18:18, Thiago Jung Bauermann > > wrote: > >> Peter Maydell writes: > >> > With my updated QEMU > >> > (which you can find in the new "sme-no-sve-2" in my gitlab repo) > >> > that can now run the tests without making the kernel fall over. > >> > It reports: > >> > > >> > # of expected passes 241 > >> > # of unexpected failures 37 > >> > > >> > Is that the same as you see on the fast model, or does this > >> > indicate that I still have more QEMU bugs to track down? > >> > (Peeking into gdb.log, these failures seem to be run-on > >> > failures from the program under test getting a SIGILL > >> > in initialize_zt_state(), so my guess is QEMU is still not > >> > quite right.) > >> > >> Indeed, there seems to be something off with QEMU. > >> On FVP, all the tests pass: > >> > >> =3D=3D=3D gdb Summary =3D=3D=3D > >> > >> # of expected passes 278 > > > > Just to check, does your FVP have the SME2p1 feature ? > > (Should show up as "sme2p1" in the feature list in /proc/cpuinfo > > in the guest.) > > It doesn't. Here's my FVP's feature list: > > Features : fp asimd evtstrm crc32 atomics fphp asimdhp cpuid asimd= rdm jscvt fcma lrcpc dcpop asimddp asimdfhm dit uscat ilrcpc flagm sb paca = pacg gcs dcpodp flagm2 frint i8mm bf16 dgh rng bti ecv afp sme smei16i64 sm= ef64f64 smei8i32 smef16f32 smeb16f32 smef32f32 wfxt ebf16 cssc mops hbc poe= lsfe OK. If I nobble QEMU locally to not enable SME2/SME2p1 (which needs source changes, as there's no command line flag for it) then I get a complete set of passes: # of expected passes 278 So possibilities: * bug in your test code for the SME2p1 case * bug in the kernel's support for SME2p1 * bug in QEMU's support for SME2p1 -- PMM