From patchwork Thu Jan 13 17:04:56 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Matheus K. Ferst" X-Patchwork-Id: 12712994 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 81CDDC433F5 for ; Thu, 13 Jan 2022 17:19:01 +0000 (UTC) Received: from localhost ([::1]:34406 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1n83kY-0001ne-9u for qemu-devel@archiver.kernel.org; Thu, 13 Jan 2022 12:19:00 -0500 Received: from eggs.gnu.org ([209.51.188.92]:50086) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1n83XW-0004ti-HK; Thu, 13 Jan 2022 12:05:31 -0500 Received: from [201.28.113.2] (port=33800 helo=outlook.eldorado.org.br) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1n83XO-0006PO-G5; Thu, 13 Jan 2022 12:05:23 -0500 Received: from p9ibm ([10.10.71.235]) by outlook.eldorado.org.br over TLS secured channel with Microsoft SMTPSVC(8.5.9600.16384); Thu, 13 Jan 2022 14:05:06 -0300 Received: from eldorado.org.br (unknown [10.10.70.45]) by p9ibm (Postfix) with ESMTP id 0E7F88006BD; Thu, 13 Jan 2022 14:05:06 -0300 (-03) From: matheus.ferst@eldorado.org.br To: qemu-devel@nongnu.org, qemu-ppc@nongnu.org Subject: [RFC PATCH v3 3/3] target/ppc: Fix gen_priv_exception error value in mfspr/mtspr Date: Thu, 13 Jan 2022 14:04:56 -0300 Message-Id: <20220113170456.1796911-4-matheus.ferst@eldorado.org.br> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220113170456.1796911-1-matheus.ferst@eldorado.org.br> References: <20220113170456.1796911-1-matheus.ferst@eldorado.org.br> MIME-Version: 1.0 X-OriginalArrivalTime: 13 Jan 2022 17:05:06.0398 (UTC) FILETIME=[B69CC7E0:01D8089F] X-Host-Lookup-Failed: Reverse DNS lookup failed for 201.28.113.2 (failed) Received-SPF: pass client-ip=201.28.113.2; envelope-from=matheus.ferst@eldorado.org.br; helo=outlook.eldorado.org.br X-Spam_score_int: -10 X-Spam_score: -1.1 X-Spam_bar: - X-Spam_report: (-1.1 / 5.0 requ) BAYES_00=-1.9, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: danielhb413@gmail.com, richard.henderson@linaro.org, laurent@vivier.eu, groug@kaod.org, clg@kaod.org, Matheus Ferst , david@gibson.dropbear.id.au Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Matheus Ferst The code in linux-user/ppc/cpu_loop.c expects POWERPC_EXCP_PRIV exception with error POWERPC_EXCP_PRIV_OPC or POWERPC_EXCP_PRIV_REG, while POWERPC_EXCP_INVAL_SPR is expected in POWERPC_EXCP_INVAL exceptions. This mismatch caused an EXCP_DUMP with the message "Unknown privilege violation (03)", as seen in [1]. Fixes: 9b2fadda3e01 ("ppc: Rework generation of priv and inval interrupts") Resolves: https://gitlab.com/qemu-project/qemu/-/issues/588 [1] https://gitlab.com/qemu-project/qemu/-/issues/588 Signed-off-by: Matheus Ferst Reviewed-by: Fabiano Rosas --- Is there any case where throwing a PRIV/INVAL exception with a INVAL/PRIV error makes sense? It seems wrong, but maybe I'm missing something... especially with the HV_EMU to program check conversion. Also, if this patch is correct, it seems that all invalid SPR access would be nop or privilege exceptions. In this case, is POWERPC_EXCP_INVAL_SPR still needed? --- target/ppc/translate.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/target/ppc/translate.c b/target/ppc/translate.c index 40232201bb..abbc3a5bb9 100644 --- a/target/ppc/translate.c +++ b/target/ppc/translate.c @@ -4827,11 +4827,11 @@ static inline void gen_op_mfspr(DisasContext *ctx) */ if (sprn & 0x10) { if (ctx->pr) { - gen_priv_exception(ctx, POWERPC_EXCP_INVAL_SPR); + gen_priv_exception(ctx, POWERPC_EXCP_PRIV_REG); } } else { if (ctx->pr || sprn == 0 || sprn == 4 || sprn == 5 || sprn == 6) { - gen_hvpriv_exception(ctx, POWERPC_EXCP_INVAL_SPR); + gen_hvpriv_exception(ctx, POWERPC_EXCP_PRIV_REG); } } } @@ -5014,11 +5014,11 @@ static void gen_mtspr(DisasContext *ctx) */ if (sprn & 0x10) { if (ctx->pr) { - gen_priv_exception(ctx, POWERPC_EXCP_INVAL_SPR); + gen_priv_exception(ctx, POWERPC_EXCP_PRIV_REG); } } else { if (ctx->pr || sprn == 0) { - gen_hvpriv_exception(ctx, POWERPC_EXCP_INVAL_SPR); + gen_hvpriv_exception(ctx, POWERPC_EXCP_PRIV_REG); } } }