From nobody Mon Nov 25 01:32:09 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1719497254; cv=none; d=zohomail.com; s=zohoarc; b=Gi1fQGPUu1pFeFo1/pGO/yKo3mHH8DSuVOLswMqinGJSAvPFwxHEAsXDrgD36AtdcFa59xOTeskDoN94ryAGo4j/q9P1cPOa0GVCjT1PDsXybE2VKPtptlzAdektVi0mJIKtpsIFItrMRCEISHCzW4PZ7aQtIOuvAwP1sH95yLI= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1719497254; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=omeEP+EChxLrWKFVAw/fyi3wTf+uHg0OC6QMr9MwfXE=; b=BuECchlzKp2mXBqm0J93/6Zu7bUxBhRK2ZolpqWrHCWAxqiRTA7qHKsJ4jJeZOmaGag13x8WLBswj3TPjUN8BR0fWOwjdsV0Z0P4WoMmuaSfivXow0unFZBl5m35U9asCa/Dg0T68XwzMz6JfzpbGSx4hDGrl6wKUICNKU1Cuc8= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1719497254588993.6715369965656; Thu, 27 Jun 2024 07:07:34 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sMplw-0001z6-7u; Thu, 27 Jun 2024 10:06:48 -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 1sMplt-0001yU-2E for qemu-devel@nongnu.org; Thu, 27 Jun 2024 10:06:45 -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 1sMplp-0003gM-OZ for qemu-devel@nongnu.org; Thu, 27 Jun 2024 10:06:44 -0400 Received: from mail-ej1-f71.google.com (mail-ej1-f71.google.com [209.85.218.71]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-241-po5dssx8P_iw_M6lOTZb0w-1; Thu, 27 Jun 2024 10:06:39 -0400 Received: by mail-ej1-f71.google.com with SMTP id a640c23a62f3a-a7194d0fd53so339423466b.0 for ; Thu, 27 Jun 2024 07:06:39 -0700 (PDT) Received: from avogadro.local ([151.48.235.205]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a72a66fc8d2sm2224866b.53.2024.06.27.07.06.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Jun 2024 07:06:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1719497200; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=omeEP+EChxLrWKFVAw/fyi3wTf+uHg0OC6QMr9MwfXE=; b=Rnl78sHExA3x095E2zjAiq7+fmHQ6wy8JwGce2zI/67e2YIOGwA35BPa2AJ6HgPRzOmRqQ aB0eNr9Er5JLGQnWqI8AFEf6hiFOArAcADBURazqMZ77DPeZWhY2pIzWJkfTzKpQhYQKmj PQcOe2GhS3pWSQLYHtAlBYfTKXsoUTk= X-MC-Unique: po5dssx8P_iw_M6lOTZb0w-1 X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1719497197; x=1720101997; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=omeEP+EChxLrWKFVAw/fyi3wTf+uHg0OC6QMr9MwfXE=; b=s+rpn+Ek8cACVEIcl3pHnk/g8t0YmsrvN3fS0mpA6Ijl022xMt2azaZrq27+eyEnbH pmg4E4eMYvDW+9MyYDtj1d4eV2CecfYP9ux3D8mNSNxAVOJ6Uqzunlyy2BJfmxPoeAKt GWC5OoN/EbvW6vSy9Ks57uF9AxmOguWjsVcppSMuh/xY0ly1YcZCW4T19czMXe+AQHMg buyXB5PuOJOpt9vzdnNckCMkc+Cn6F5ygpg4oWJgpbYfnKH9Hpm8Ef2FH5cd0fuHUKvO ec3pzYWWT9NAlCga0RRcmQyw3Lipt0rPGZoAtPCouY2/JvuYlVKjsSEDjzegOq3IN/mu /BmA== X-Gm-Message-State: AOJu0YzSiQFJUnyvzigU8nkK/2TUJcKptQ+D4uDfyZpAFR741H3vyqO7 0UBs9ZSbN84n9s+9v4bCKKSZHYadohZt8TUSSnkMHQTKWH1O2BILvTyLgawTjU2yOdaHYArvybt zGWr7y2yNhZCHf9e/qI3AsH7XNc//oBGfZVcgyinj/CAhtJNPWUp2LRSSEFV08rtXEO3+l1ZQRs tf/ixViRyUISa8NRZnDZOJqztjxTpiYOXvJzl4 X-Received: by 2002:a17:907:a80e:b0:a72:7e1e:62e6 with SMTP id a640c23a62f3a-a727e1e65cemr588647166b.63.1719497197496; Thu, 27 Jun 2024 07:06:37 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFXINIDstjLifrWxu81EqWugJsfQepKF8HP2z4IC1V66fe5A8OwrMmsGOzzEXfxqy8bG82MrA== X-Received: by 2002:a17:907:a80e:b0:a72:7e1e:62e6 with SMTP id a640c23a62f3a-a727e1e65cemr588643866b.63.1719497196893; Thu, 27 Jun 2024 07:06:36 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Cc: Xiaoyao Li , John Allen Subject: [PATCH 2/2] target/i386: drop AMD machine check bits from Intel CPUID Date: Thu, 27 Jun 2024 16:06:28 +0200 Message-ID: <20240627140628.1025317-3-pbonzini@redhat.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240627140628.1025317-1-pbonzini@redhat.com> References: <20240627140628.1025317-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.212, 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_H4=0.001, RCVD_IN_MSPIKE_WL=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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1719497256052100005 Content-Type: text/plain; charset="utf-8" The recent addition of the SUCCOR bit to kvm_arch_get_supported_cpuid() causes the bit to be visible when "-cpu host" VMs are started on Intel processors. While this should in principle be harmless, it's not tidy and we don't even know for sure that it doesn't cause any guest OS to take unexpected paths. Since x86_cpu_get_supported_feature_word() can return different different values depending on the guest, adjust it to hide the SUCCOR bit if the guest has non-AMD vendor. Suggested-by: Xiaoyao Li Cc: John Allen Signed-off-by: Paolo Bonzini --- target/i386/cpu.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index deb58670651..f3e9b543682 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -6064,8 +6064,10 @@ uint64_t x86_cpu_get_supported_feature_word(X86CPU *= cpu, FeatureWord w) } else { return ~0; } + + switch (w) { #ifndef TARGET_X86_64 - if (w =3D=3D FEAT_8000_0001_EDX) { + case FEAT_8000_0001_EDX: /* * 32-bit TCG can emulate 64-bit compatibility mode. If there is = no * way for userspace to get out of its 32-bit jail, we can leave @@ -6077,6 +6079,18 @@ uint64_t x86_cpu_get_supported_feature_word(X86CPU *= cpu, FeatureWord w) r &=3D ~unavail; break; #endif + + case FEAT_8000_0007_EBX: + if (cpu && !IS_AMD_CPU(&cpu->env)) { + /* Disable AMD machine check architecture for Intel CPU. */ + r =3D 0; + } + break; + + default: + break; + } + if (cpu && cpu->migratable) { r &=3D x86_cpu_get_migratable_flags(w); } --=20 2.45.2