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[174.21.149.226]) by smtp.gmail.com with ESMTPSA id g25sm4015182pfo.150.2020.04.21.21.39.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 21 Apr 2020 21:39:56 -0700 (PDT) Subject: Re: tst-arm-mte bug: PSTATE.TCO is cleared on exceptions To: Szabolcs Nagy References: <20200420102902.GE15401@arm.com> From: Richard Henderson Message-ID: Date: Tue, 21 Apr 2020 21:39:54 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <20200420102902.GE15401@arm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2607:f8b0:4864:20::543; envelope-from=richard.henderson@linaro.org; helo=mail-pg1-x543.google.com X-detected-operating-system: by eggs.gnu.org: Error: [-] PROGRAM ABORT : Malformed IPv6 address (bad octet value). Location : parse_addr6(), p0f-client.c:67 X-Received-From: 2607:f8b0:4864:20::543 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: nd@arm.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 4/20/20 3:29 AM, Szabolcs Nagy wrote: > i'm using the branch at > > https://github.com/rth7680/qemu/tree/tgt-arm-mte > > to test armv8.5-a mte and hope this is ok to report bugs here. > > i'm doing tests in qemu-system-aarch64 with linux userspace > code and it seems TCO bit gets cleared after syscalls or other > kernel entry, but PSTATE is expected to be restored, so i > suspect it is a qemu bug. > > i think the architecture saves/restores PSTATE using SPSR_ELx > on exceptions. Yep. I failed to update aarch64_pstate_valid_mask for TCO. Will fix. Thanks, r~ > > i used the linux branch > https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/log/?h=devel/mte-v2 > > attached a reproducer that segfaults in qemu but should work. > > thanks. >