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 DBCBAC433FE for ; Wed, 3 Nov 2021 06:28:45 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 8AB3A60240 for ; Wed, 3 Nov 2021 06:28:45 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 8AB3A60240 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 3A2654B1B6; Wed, 3 Nov 2021 02:28:45 -0400 (EDT) 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 GtM5jcS0lEdg; Wed, 3 Nov 2021 02:28:43 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 9B3454B1CF; Wed, 3 Nov 2021 02:28:40 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id E46E74B152 for ; Wed, 3 Nov 2021 02:28:39 -0400 (EDT) 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 9yeq21qFg0Tk for ; Wed, 3 Nov 2021 02:28:38 -0400 (EDT) Received: from mail-pg1-f202.google.com (mail-pg1-f202.google.com [209.85.215.202]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 7598B4B16F for ; Wed, 3 Nov 2021 02:28:38 -0400 (EDT) Received: by mail-pg1-f202.google.com with SMTP id m74-20020a633f4d000000b0029fed7e61f9so999187pga.16 for ; Tue, 02 Nov 2021 23:28:38 -0700 (PDT) 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=Ep2NTeFQHRtb1x7tniQeG2pd+DzpIaqpLIGDyxGNaak=; b=fFT02gdqViWYrbCdTEQFZh2dd8gF3sRFDKawTgXYqjLI7nmc2vVWIHc5fQYX9NKzEd OrN0S2OhP0OEbUusgLIOJ24ho/2alYvcos4x7SolFhapIn6YxL0Q/VDzjpdSyamRXq5s RrMyR8gjtsL8vUcd0lgvbJ6rN2iAQkzAgkFYvLsnRwgoEAjFhXUV3qEsGRMH+1yMZEsW 29uITSD/EwfM2NeAOOpPDlb7zlKc6xEPzSf2xyfOc7+pQtJPKZvN+WxtlnnDnD9b2L8D LRn27uaxX+R+rYFbVrWjFF0aBcTVeCPiqJg9ZhuOt107MpCcOF6wgHso+ZYIQoYbVD/j HDkQ== 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=Ep2NTeFQHRtb1x7tniQeG2pd+DzpIaqpLIGDyxGNaak=; b=siXBz3w5BP5S89XZ6WzpkA5VvJZYBfFGTlHGG6be6TYEg/kNgVntUt7LtKVwfIqvzn muDrjxBhnUVdLPQAcEXKT7PzROdlpv/4uVEQIsGCXeopkN6mfxLBOB0ONoYqJcgi3bxs aOVT5zs47HGoM+GXlggK1dRHqk2T4ydaGB9io/vPiCc7RMskEsKHY6m/QyCR07+hJBRO 0r/h/fpGaAAu8Kct6T2YUXNVHMkErDK6CfHi6FdGf2/r0k3IPzeJYF2kKGc1HOnkzFxn pH/b4ZgWwvBU7dEDrGkb3CUy2LFkl4pcvRVsvHTY1rcNkCi1XFrupQeH7cLIHXIKFaWC BLKQ== X-Gm-Message-State: AOAM533NxLaOw/rcsIjhwtKgyisClL5AIsjSygRMyFpIepO+Lr4G08GJ Wl5JUtFreamEROL74vsKM2mt7AOKooE= X-Google-Smtp-Source: ABdhPJxq8mVjnPJ20WpU44gAZn9NtxzZ4+sWrLWZuqNplD2biJyP84pZy1BiGUiTUN9ebm+egsfYYdatDyg= X-Received: from reiji-vws-sp.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:3d59]) (user=reijiw job=sendgmr) by 2002:a17:903:24c:b0:13f:2377:ef3a with SMTP id j12-20020a170903024c00b0013f2377ef3amr36514167plh.59.1635920917622; Tue, 02 Nov 2021 23:28:37 -0700 (PDT) Date: Tue, 2 Nov 2021 23:25:18 -0700 In-Reply-To: <20211103062520.1445832-1-reijiw@google.com> Message-Id: <20211103062520.1445832-27-reijiw@google.com> Mime-Version: 1.0 References: <20211103062520.1445832-1-reijiw@google.com> X-Mailer: git-send-email 2.33.1.1089.g2158813163f-goog Subject: [RFC PATCH v2 26/28] 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 2d2263abac90..fd38b3574864 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -374,6 +374,30 @@ 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 = __vcpu_sys_reg(vcpu, IDREG_SYS_IDX(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, @@ -478,6 +502,14 @@ 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 */ @@ -953,6 +985,10 @@ 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 = { -- 2.33.1.1089.g2158813163f-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm