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Thu, 18 Jun 2026 00:31:28 -0700 (PDT) Received: from blinky ([2601:647:6700:64d0::92d1]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-30bbbd636fasm7319764eec.22.2026.06.18.00.31.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Jun 2026 00:31:28 -0700 (PDT) Date: Thu, 18 Jun 2026 00:31:26 -0700 From: Charlie Jenkins To: Nam Cao Cc: Charlie Jenkins via B4 Relay , Paul Walmsley , Palmer Dabbelt , Alexandre Ghiti , Anup Patel , Atish Patra , Conor Dooley , Paolo Bonzini , Andrew Morton , Shuah Khan , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH 04/16] riscv: kprobes: Use generated instruction headers Message-ID: References: <20260407-riscv_insn_table-v1-0-54b4736a1e77@gmail.com> <20260407-riscv_insn_table-v1-4-54b4736a1e77@gmail.com> <87jys5egum.fsf@yellow.woof> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <87jys5egum.fsf@yellow.woof> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260618_003130_511391_393B7AB3 X-CRM114-Status: GOOD ( 15.62 ) X-BeenThere: kvm-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kvm-riscv" Errors-To: kvm-riscv-bounces+kvm-riscv=archiver.kernel.org@lists.infradead.org On Thu, Jun 11, 2026 at 08:22:41AM +0200, Nam Cao wrote: > Charlie Jenkins via B4 Relay > writes: > > This was again verified by checking all 32-bit values for each of these > > functions and checking that the two version have the same behavior. > > Your checking is missing some cases. branch instructions and c.jr are > broken. > > Btw, any chance that check can be added as a new kunit test case? I > wrote the CONFIG_RISCV_KPROBES_KUNIT, but that only tests some values. Okay I looked back over my test cases and realized my mistakes. I was iterating through all possible 32-bit values and passing them into the new simulate_* functions and comparing the register state to the old simulate_* instructions. I missed the _pc + addr bug because the _pc value I was using was 0. I missed the simulate_c_jr ra bug because I was not checking ra. Since I was checking against the previous version it's not possible to do a straight one-to-one conversion to the kunit. I think it might be possible to do something similar but I will need to mess with that to determine a good way of doing it. - Charlie > > Nam -- kvm-riscv mailing list kvm-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kvm-riscv From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-dl1-f44.google.com (mail-dl1-f44.google.com [74.125.82.44]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0238A3CF1ED for ; Thu, 18 Jun 2026 07:31:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.82.44 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781767891; cv=none; b=G0zOfttQEkJ/PGMk8l1MHbTiZPdV5eMUnRfGNcukcAaEMaNyVdPFBw/jq5dByqEONJgh2WP1HYIOxPHPYsfrmzYzeR2O3i/0vCVcfMH15S4c5dBDKfqYY/Rl8HM5298y8k32exWirfMt9EgRjMuUpLbWb+/08USWj3YesX628jo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; 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Thu, 18 Jun 2026 00:31:28 -0700 (PDT) Received: from blinky ([2601:647:6700:64d0::92d1]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-30bbbd636fasm7319764eec.22.2026.06.18.00.31.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 18 Jun 2026 00:31:28 -0700 (PDT) Date: Thu, 18 Jun 2026 00:31:26 -0700 From: Charlie Jenkins To: Nam Cao Cc: Charlie Jenkins via B4 Relay , Paul Walmsley , Palmer Dabbelt , Alexandre Ghiti , Anup Patel , Atish Patra , Conor Dooley , Paolo Bonzini , Andrew Morton , Shuah Khan , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH 04/16] riscv: kprobes: Use generated instruction headers Message-ID: References: <20260407-riscv_insn_table-v1-0-54b4736a1e77@gmail.com> <20260407-riscv_insn_table-v1-4-54b4736a1e77@gmail.com> <87jys5egum.fsf@yellow.woof> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87jys5egum.fsf@yellow.woof> On Thu, Jun 11, 2026 at 08:22:41AM +0200, Nam Cao wrote: > Charlie Jenkins via B4 Relay > writes: > > This was again verified by checking all 32-bit values for each of these > > functions and checking that the two version have the same behavior. > > Your checking is missing some cases. branch instructions and c.jr are > broken. > > Btw, any chance that check can be added as a new kunit test case? I > wrote the CONFIG_RISCV_KPROBES_KUNIT, but that only tests some values. Okay I looked back over my test cases and realized my mistakes. I was iterating through all possible 32-bit values and passing them into the new simulate_* functions and comparing the register state to the old simulate_* instructions. I missed the _pc + addr bug because the _pc value I was using was 0. I missed the simulate_c_jr ra bug because I was not checking ra. Since I was checking against the previous version it's not possible to do a straight one-to-one conversion to the kunit. I think it might be possible to do something similar but I will need to mess with that to determine a good way of doing it. - Charlie > > Nam From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3AD99CD98F0 for ; Thu, 18 Jun 2026 07:31:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; 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Thu, 18 Jun 2026 00:31:28 -0700 (PDT) Date: Thu, 18 Jun 2026 00:31:26 -0700 From: Charlie Jenkins To: Nam Cao Cc: Charlie Jenkins via B4 Relay , Paul Walmsley , Palmer Dabbelt , Alexandre Ghiti , Anup Patel , Atish Patra , Conor Dooley , Paolo Bonzini , Andrew Morton , Shuah Khan , linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH 04/16] riscv: kprobes: Use generated instruction headers Message-ID: References: <20260407-riscv_insn_table-v1-0-54b4736a1e77@gmail.com> <20260407-riscv_insn_table-v1-4-54b4736a1e77@gmail.com> <87jys5egum.fsf@yellow.woof> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <87jys5egum.fsf@yellow.woof> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260618_003130_631112_E23EB3C2 X-CRM114-Status: GOOD ( 15.62 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org On Thu, Jun 11, 2026 at 08:22:41AM +0200, Nam Cao wrote: > Charlie Jenkins via B4 Relay > writes: > > This was again verified by checking all 32-bit values for each of these > > functions and checking that the two version have the same behavior. > > Your checking is missing some cases. branch instructions and c.jr are > broken. > > Btw, any chance that check can be added as a new kunit test case? I > wrote the CONFIG_RISCV_KPROBES_KUNIT, but that only tests some values. Okay I looked back over my test cases and realized my mistakes. I was iterating through all possible 32-bit values and passing them into the new simulate_* functions and comparing the register state to the old simulate_* instructions. I missed the _pc + addr bug because the _pc value I was using was 0. I missed the simulate_c_jr ra bug because I was not checking ra. Since I was checking against the previous version it's not possible to do a straight one-to-one conversion to the kunit. I think it might be possible to do something similar but I will need to mess with that to determine a good way of doing it. - Charlie > > Nam _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv