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[174.21.149.226]) by smtp.gmail.com with ESMTPSA id e135sm6475236pfh.37.2020.04.24.12.47.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 24 Apr 2020 12:47:48 -0700 (PDT) Subject: Re: tst-arm-mte bug: PSTATE.TCO is cleared on exceptions From: Richard Henderson To: Szabolcs Nagy References: <20200420102902.GE15401@arm.com> Message-ID: Date: Fri, 24 Apr 2020 12:47:46 -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: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=2607:f8b0:4864:20::535; envelope-from=richard.henderson@linaro.org; helo=mail-pg1-x535.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::535 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 4/21/20 9:39 PM, Richard Henderson wrote: > 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, Fixed on the branch. I still need to work out how best to plumb the arm,armv8.5-memtag property so the devel/mte-v3 kernel branch isn't usable as-is for the moment. For myself, I've just commented that test out for now. r~