From nobody Tue Feb 10 01:35:05 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; 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=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1623925082057634.5461373721448; Thu, 17 Jun 2021 03:18:02 -0700 (PDT) Received: from localhost ([::1]:59102 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ltp61-0003O4-0Y for importer@patchew.org; Thu, 17 Jun 2021 06:18:01 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:55442) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ltoNe-0003Fj-V5 for qemu-devel@nongnu.org; Thu, 17 Jun 2021 05:32:10 -0400 Received: from mail-ed1-x52f.google.com ([2a00:1450:4864:20::52f]:45601) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1ltoNY-0006My-AZ for qemu-devel@nongnu.org; Thu, 17 Jun 2021 05:32:09 -0400 Received: by mail-ed1-x52f.google.com with SMTP id r7so3016939edv.12 for ; Thu, 17 Jun 2021 02:32:03 -0700 (PDT) Received: from avogadro.lan ([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.gmail.com with ESMTPSA id m18sm3328140ejx.56.2021.06.17.02.32.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Jun 2021 02:32:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=fB1DEpUXUs5bLKT6hBBiKcj8AC7+sYf8pppcVv3D4tA=; b=kpYp5u39PNQgotaElkbs2+5cTMuuOqP7FN4bFYSvgOWzlhBVK9kYosaFmtpFohZlAZ S63G8IQKU2D67OjQazV2zudlm9pecYpqNeHaUA0EbOyR4rINeeLAa3D/VTigxWNx9BQq SuBl2cMA2XPUGhpTKEdQVvxiA/NxfUTz+Oyk83w9rPuCy4P0NC5HEjU5qIu6fm3LdDlj Qb5YsAS38v7becJoJ5xjlkvJrG8hOr/ep/2VP3eChT6I/8gZMboaOaIEHVq59agE1/rN ufd2WDezapQrsDj9ZiOieRTaHSirN1KXXYOZRYwBaLjnO+k4WzUxy8cd3EnopCzVFruC cGlQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:content-transfer-encoding; bh=fB1DEpUXUs5bLKT6hBBiKcj8AC7+sYf8pppcVv3D4tA=; b=VRFVJeUNkyxmgUGolZAaH4ZVxUn/8AqUbNH36RngaSenddxATqumt3psj1YDRPD/oC oFz1m1lXm6EWYl6fJIEFII5+0Qpbh51BIpy33mWbmp+gTdFo3Aoab6P6/Plvxqxhm2YT V20kro+DcNI84z486HUw1MEhBg6fc0OCe1z6J7dLw6rG0s41zrGPxmS/rzZAbjwY6oTN bEHpic/6MSSjZvxDy5Bf+jzCnLbo2UDRb8ertmJv4Poe3cx7IbgjGEhxofIwRvOx2ZMO zhRzwGrRoJhC565jwVIOZeyd0nxlSwGzxK2QLRUEh0OD+w2iq3QGSk2GfKXIIxFFOUpL 0s9A== X-Gm-Message-State: AOAM530U4tpXCZGQiKeMI1ydt3J7/LY4I9Y4UwacOATF8SuhuuO3pPQm vXJ7ugciYcdZf3jJ1wFAZu/aP7JlWBw= X-Google-Smtp-Source: ABdhPJy23m9sxOi91979Hyuguf/FVpesrQ+hWwwCnYo5/ByIHLzx4Mp7ZT1LSref5685KdDN92+U9A== X-Received: by 2002:a50:ccd8:: with SMTP id b24mr1943333edj.386.1623922322859; Thu, 17 Jun 2021 02:32:02 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Subject: [PULL 37/45] target/i386: Added Intercept CR0 writes check Date: Thu, 17 Jun 2021 11:31:26 +0200 Message-Id: <20210617093134.900014-38-pbonzini@redhat.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210617093134.900014-1-pbonzini@redhat.com> References: <20210617093134.900014-1-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=2a00:1450:4864:20::52f; envelope-from=paolo.bonzini@gmail.com; helo=mail-ed1-x52f.google.com X-Spam_score_int: -14 X-Spam_score: -1.5 X-Spam_bar: - X-Spam_report: (-1.5 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FORGED_FROMDOMAIN=0.248, FREEMAIL_FROM=0.001, HEADER_FROM_DIFFERENT_DOMAINS=0.249, RCVD_IN_DNSWL_NONE=-0.0001, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Lara Lazier Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" From: Lara Lazier When the selective CR0 write intercept is set, all writes to bits in CR0 other than CR0.TS or CR0.MP cause a VMEXIT. Signed-off-by: Lara Lazier Message-Id: <20210616123907.17765-5-laramglazier@gmail.com> Signed-off-by: Paolo Bonzini --- target/i386/tcg/sysemu/misc_helper.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/target/i386/tcg/sysemu/misc_helper.c b/target/i386/tcg/sysemu/= misc_helper.c index 0cef2f1a4c..db0d8a9d79 100644 --- a/target/i386/tcg/sysemu/misc_helper.c +++ b/target/i386/tcg/sysemu/misc_helper.c @@ -84,6 +84,15 @@ void helper_write_crN(CPUX86State *env, int reg, target_= ulong t0) { switch (reg) { case 0: + /* + * If we reach this point, the CR0 write intercept is disabled. + * But we could still exit if the hypervisor has requested the sele= ctive + * intercept for bits other than TS and MP + */ + if (cpu_svm_has_intercept(env, SVM_EXIT_CR0_SEL_WRITE) && + ((env->cr[0] ^ t0) & ~(CR0_TS_MASK | CR0_MP_MASK))) { + cpu_vmexit(env, SVM_EXIT_CR0_SEL_WRITE, 0, GETPC()); + } cpu_x86_update_cr0(env, t0); break; case 3: --=20 2.31.1