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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BF045C4332F for ; Wed, 17 Nov 2021 06:53:56 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 76BBD619F6 for ; Wed, 17 Nov 2021 06:53:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 76BBD619F6 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 2CB6F4B156; Wed, 17 Nov 2021 01:53:56 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@google.com Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UsKawgkEB0kG; Wed, 17 Nov 2021 01:53:55 -0500 (EST) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 7DE234B15E; Wed, 17 Nov 2021 01:53:54 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 9323A4B1AA for ; Wed, 17 Nov 2021 01:53:53 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id eBEsdarcVmbm for ; Wed, 17 Nov 2021 01:53:52 -0500 (EST) Received: from mail-pf1-f202.google.com (mail-pf1-f202.google.com [209.85.210.202]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id A4AA64B1B0 for ; Wed, 17 Nov 2021 01:53:50 -0500 (EST) Received: by mail-pf1-f202.google.com with SMTP id 184-20020a6217c1000000b0049f9aad0040so1090827pfx.21 for ; Tue, 16 Nov 2021 22:53:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=l9cL+44fLGdDyYUFjHlYq+dL32isCwZtQcuWO6mBjWA=; b=o36k6i54cI44CkxNoyng06/1cnBbAHYmtiCr8v2I/KDJLlWFA9DKoh2o8QlHJ4ioDR ZBxEhJYYuxUj3CTLSPaVa+LdwzJtLW5vmimI7ZyOL/v2EdkMBv8s7Zb8aNQg1qDNc1Ji 0DxExQLqbrEaTySPkb4iHM10iwaD6drKdifBiW/5Im3Zz2e/K9hPnXG1khJlse+zcZfe e1gO5CpHsd0NA0rBCs8UNOzB5v4100BqKNd+PqC7I11geGCXteo1kcbBCX3QdXqmulGu Uet1f3rbkcNvy1NTGYTYO05MVb+WFisTpVESqHDn9yTzGcCfcX+q2hF+HlQKq8DvKfbW rToA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=l9cL+44fLGdDyYUFjHlYq+dL32isCwZtQcuWO6mBjWA=; b=c+Rbpa1ED+8WsnLJ/HDghBnK5LBXlVWNSSbQP0WzalbKV86q6z4dJen3GaPLXhSCIp DWumb0n5NId4gtuPwGKJd0ncy74I5+lK8EB8dBlIw8cqoLpares5S5Dt6vv3/EXuh4vs vvpGtCY8nw0kOrA/f0AYHXhvNM8Zl+deM/uHtftNN0R7EBATkiIPK/oU3aB3PChnMm1/ kaUc08VYNgKVE599gkyigPZGFS1c353PScBVoTJnj8eWPBBwldnVOHjH/nWmty2Liy66 iMs+eKdcEVn4xJIB+6Brwr2cfL6RIcuwnQrrfXsZJo+NsJfyU/U6ybA3b7Ii9UssIPZm f2+A== X-Gm-Message-State: AOAM532d/M5/Ti30croOZJT3YZlbjzB2VojwUcMZpgUfNTkQ0Sg8HlB9 SKfYMMqg1VxyevDcDuM+unNw/O35s0Q= X-Google-Smtp-Source: ABdhPJx9DDeQMUXc6095SOTfgNA0s7/GlZiDRs9vbKaSt1H48YgTnr7zDO2ifTxH2Q2Olse8b10fDPjrRfI= X-Received: from reiji-vws-sp.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:3d59]) (user=reijiw job=sendgmr) by 2002:a17:90a:df97:: with SMTP id p23mr6831251pjv.3.1637132029846; Tue, 16 Nov 2021 22:53:49 -0800 (PST) Date: Tue, 16 Nov 2021 22:43:56 -0800 In-Reply-To: <20211117064359.2362060-1-reijiw@google.com> Message-Id: <20211117064359.2362060-27-reijiw@google.com> Mime-Version: 1.0 References: <20211117064359.2362060-1-reijiw@google.com> X-Mailer: git-send-email 2.34.0.rc1.387.gb447b232ab-goog Subject: [RFC PATCH v3 26/29] KVM: arm64: Trap disabled features of ID_AA64ISAR1_EL1 From: Reiji Watanabe To: Marc Zyngier , kvmarm@lists.cs.columbia.edu Cc: kvm@vger.kernel.org, Will Deacon , Peter Shier , Paolo Bonzini , linux-arm-kernel@lists.infradead.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu Add feature_config_ctrl for PTRAUTH, which is indicated in ID_AA64ISAR1_EL1, to program configuration register to trap guest's using the feature when it is not exposed to the guest. Signed-off-by: Reiji Watanabe --- arch/arm64/kvm/sys_regs.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 3d3b29515b8b..f1f975ce7b07 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -376,6 +376,30 @@ static int arm64_check_features(u64 check_types, u64 val, u64 lim) (cpuid_feature_extract_unsigned_field(val, ID_AA64ISAR1_GPI_SHIFT) >= \ ID_AA64ISAR1_GPI_IMP_DEF) +/* + * Return true if ptrauth needs to be trapped. + * (i.e. if ptrauth is supported on the host but not exposed to the guest) + */ +static bool vcpu_need_trap_ptrauth(struct kvm_vcpu *vcpu) +{ + u64 val; + bool generic, address; + + if (!system_has_full_ptr_auth()) + /* The feature is not supported. */ + return false; + + val = __read_id_reg(vcpu, SYS_ID_AA64ISAR1_EL1); + generic = aa64isar1_has_gpi(val) || aa64isar1_has_gpa(val); + address = aa64isar1_has_api(val) || aa64isar1_has_apa(val); + if (generic && address) + /* The feature is available. */ + return false; + + /* The feature is supported but hidden. */ + return true; +} + enum vcpu_config_reg { VCPU_HCR_EL2 = 1, VCPU_MDCR_EL2, @@ -480,6 +504,14 @@ static struct feature_config_ctrl ftr_ctrl_lor = { .cfg_val = HCR_TLOR, }; +/* For SYS_ID_AA64ISAR1_EL1 */ +static struct feature_config_ctrl ftr_ctrl_ptrauth = { + .ftr_need_trap = vcpu_need_trap_ptrauth, + .cfg_reg = VCPU_HCR_EL2, + .cfg_mask = (HCR_API | HCR_APK), + .cfg_val = 0, +}; + struct id_reg_info { u32 sys_reg; /* Register ID */ u64 sys_val; /* Sanitized system value */ @@ -977,6 +1009,10 @@ static struct id_reg_info id_aa64isar1_el1_info = { .init = init_id_aa64isar1_el1_info, .validate = validate_id_aa64isar1_el1, .get_reset_val = get_reset_id_aa64isar1_el1, + .trap_features = &(const struct feature_config_ctrl *[]) { + &ftr_ctrl_ptrauth, + NULL, + }, }; static struct id_reg_info id_aa64mmfr0_el1_info = { -- 2.34.0.rc1.387.gb447b232ab-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm