From patchwork Thu Oct 10 14:56:27 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Markus Armbruster X-Patchwork-Id: 1995495 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=aHWlJttk; dkim-atps=neutral Authentication-Results: legolas.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=patchwork.ozlabs.org) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by legolas.ozlabs.org (Postfix) with ESMTPS id 4XPXtM5SJWz1xsc for ; Fri, 11 Oct 2024 01:57:47 +1100 (AEDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1syub0-000325-Mz; Thu, 10 Oct 2024 10:56:54 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1syuaw-0002zY-Q1 for qemu-devel@nongnu.org; Thu, 10 Oct 2024 10:56:51 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1syuav-0002m4-5L for qemu-devel@nongnu.org; Thu, 10 Oct 2024 10:56:50 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1728572207; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=lp341gE5AEB1X9InS6vzxwFSt+sabArHeK8SLDvX+fw=; b=aHWlJttkxFIS5dRyumbQIX4IMisGCgDBx7W2l+/yEgaAGh4e1ddgg2aD+hTom0MhuI8IC0 ueKpV+u+I354JL0SxMjee/C/zCGQ7bFCF2VLxi1GQ2FvHC4Em56IEi1c83MvUxQJMI7ELp lqFfJkPq6hS8yAk8sGrQzkTaHLbjvg8= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-131-3XDkPId5NA2CmSioqKbeEg-1; Thu, 10 Oct 2024 10:56:42 -0400 X-MC-Unique: 3XDkPId5NA2CmSioqKbeEg-1 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id AE9851955F3F; Thu, 10 Oct 2024 14:56:40 +0000 (UTC) Received: from blackfin.pond.sub.org (unknown [10.39.192.47]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id F329B300019E; Thu, 10 Oct 2024 14:56:34 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id 56F5B21E6889; Thu, 10 Oct 2024 16:56:30 +0200 (CEST) From: Markus Armbruster To: qemu-devel@nongnu.org Cc: xieyongji@bytedance.com, kwolf@redhat.com, hreitz@redhat.com, Coiby.Xu@gmail.com, pbonzini@redhat.com, berrange@redhat.com, eduardo@habkost.net, mark.cave-ayland@ilande.co.uk, michael.roth@amd.com, kkostiuk@redhat.com, qemu-block@nongnu.org Subject: [PATCH 4/7] target/i386/cpu: Avoid mixing signed and unsigned in property setters Date: Thu, 10 Oct 2024 16:56:27 +0200 Message-ID: <20241010145630.985335-5-armbru@redhat.com> In-Reply-To: <20241010145630.985335-1-armbru@redhat.com> References: <20241010145630.985335-1-armbru@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Received-SPF: pass client-ip=170.10.129.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.149, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Properties "family", "model", and "stepping" are visited as signed integers. They are backed by bits in CPUX86State member @cpuid_version. The code to extract and insert these bits mixes signed and unsigned. Not actually wrong, but avoiding such mixing is good practice. Visit them as unsigned integers instead. This adds a few mildly ugly cast in arguments of error_setg(). The next commit will get rid of them. Property "tsc-frequency" is also visited as signed integer. The value ultimately flows into the kernel, where it is 31 bits unsigned. The QEMU code freely mixes int, uint32_t, int64_t. I elect not to try draining this swamp today. Signed-off-by: Markus Armbruster Reviewed-by: Daniel P. Berrangé --- target/i386/cpu.c | 45 +++++++++++++++++++++------------------------ 1 file changed, 21 insertions(+), 24 deletions(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index ff227a8c5c..4f8fa60432 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -5433,13 +5433,13 @@ static void x86_cpuid_version_get_family(Object *obj, Visitor *v, { X86CPU *cpu = X86_CPU(obj); CPUX86State *env = &cpu->env; - int64_t value; + uint64_t value; value = (env->cpuid_version >> 8) & 0xf; if (value == 0xf) { value += (env->cpuid_version >> 20) & 0xff; } - visit_type_int(v, name, &value, errp); + visit_type_uint64(v, name, &value, errp); } static void x86_cpuid_version_set_family(Object *obj, Visitor *v, @@ -5448,16 +5448,15 @@ static void x86_cpuid_version_set_family(Object *obj, Visitor *v, { X86CPU *cpu = X86_CPU(obj); CPUX86State *env = &cpu->env; - const int64_t min = 0; - const int64_t max = 0xff + 0xf; - int64_t value; + const uint64_t max = 0xff + 0xf; + uint64_t value; - if (!visit_type_int(v, name, &value, errp)) { + if (!visit_type_uint64(v, name, &value, errp)) { return; } - if (value < min || value > max) { + if (value > max) { error_setg(errp, QERR_PROPERTY_VALUE_OUT_OF_RANGE, "", - name ? name : "null", value, min, max); + name ? name : "null", value, (int64_t)0, (int64_t)max); return; } @@ -5475,11 +5474,11 @@ static void x86_cpuid_version_get_model(Object *obj, Visitor *v, { X86CPU *cpu = X86_CPU(obj); CPUX86State *env = &cpu->env; - int64_t value; + uint64_t value; value = (env->cpuid_version >> 4) & 0xf; value |= ((env->cpuid_version >> 16) & 0xf) << 4; - visit_type_int(v, name, &value, errp); + visit_type_uint64(v, name, &value, errp); } static void x86_cpuid_version_set_model(Object *obj, Visitor *v, @@ -5488,16 +5487,15 @@ static void x86_cpuid_version_set_model(Object *obj, Visitor *v, { X86CPU *cpu = X86_CPU(obj); CPUX86State *env = &cpu->env; - const int64_t min = 0; - const int64_t max = 0xff; - int64_t value; + const uint64_t max = 0xff; + uint64_t value; - if (!visit_type_int(v, name, &value, errp)) { + if (!visit_type_uint64(v, name, &value, errp)) { return; } - if (value < min || value > max) { + if (value > max) { error_setg(errp, QERR_PROPERTY_VALUE_OUT_OF_RANGE, "", - name ? name : "null", value, min, max); + name ? name : "null", value, (int64_t)0, (int64_t)max); return; } @@ -5511,10 +5509,10 @@ static void x86_cpuid_version_get_stepping(Object *obj, Visitor *v, { X86CPU *cpu = X86_CPU(obj); CPUX86State *env = &cpu->env; - int64_t value; + uint64_t value; value = env->cpuid_version & 0xf; - visit_type_int(v, name, &value, errp); + visit_type_uint64(v, name, &value, errp); } static void x86_cpuid_version_set_stepping(Object *obj, Visitor *v, @@ -5523,16 +5521,15 @@ static void x86_cpuid_version_set_stepping(Object *obj, Visitor *v, { X86CPU *cpu = X86_CPU(obj); CPUX86State *env = &cpu->env; - const int64_t min = 0; - const int64_t max = 0xf; - int64_t value; + const uint64_t max = 0xf; + uint64_t value; - if (!visit_type_int(v, name, &value, errp)) { + if (!visit_type_uint64(v, name, &value, errp)) { return; } - if (value < min || value > max) { + if (value > max) { error_setg(errp, QERR_PROPERTY_VALUE_OUT_OF_RANGE, "", - name ? name : "null", value, min, max); + name ? name : "null", value, (int64_t)0, (int64_t)max); return; }