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 7C18EC433FE for ; Tue, 12 Oct 2021 04:36:51 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 34D4C6108F for ; Tue, 12 Oct 2021 04:36:51 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 34D4C6108F 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 E0F984B12E; Tue, 12 Oct 2021 00:36:50 -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 GN44TD7Sq1da; Tue, 12 Oct 2021 00:36:49 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id B7B794B132; Tue, 12 Oct 2021 00:36:48 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id CA41B4A534 for ; Tue, 12 Oct 2021 00:36:47 -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 WrqYhazSBBRw for ; Tue, 12 Oct 2021 00:36:46 -0400 (EDT) Received: from mail-pj1-f74.google.com (mail-pj1-f74.google.com [209.85.216.74]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 4CCA74B0BF for ; Tue, 12 Oct 2021 00:36:46 -0400 (EDT) Received: by mail-pj1-f74.google.com with SMTP id 41-20020a17090a0fac00b00195a5a61ab8so1224174pjz.3 for ; Mon, 11 Oct 2021 21:36:46 -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=0ZHKUOwuChcfcYJa8iP/PsFVSj3BwFFjpYVXfGnVVxU=; b=mjDXddS6mtqkEh62Do5NxpNb41/LwWTC2n3D/+Ug1Lcuv37dFkYweiWPN8B2WJkYmW mKzZdfIRWGthEyo4paKm+wXpRD2HY+B4w03MH8YsO/8fSiLbYK9t7a8i2cl3Plz9WiaC XXTcsTP9VQNfk8U99KOkX47Sid6a/cpShR5kKUIvVj5ar6NWFZ6ZM6tzjRFg9noqCeIu uPeuk/T3jbx+usHKSylBvdCnC+BZ0rYmp79KWyRLa9DYQkjr1PID0fZWf8og9KjiK7iQ /FCF5a+cl1wmRp7tld6cptvvssMjVhPNPZRPj9yfV78Hyzea1ESojs5S9TEw3WBAIbl8 Jwsw== 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=0ZHKUOwuChcfcYJa8iP/PsFVSj3BwFFjpYVXfGnVVxU=; b=1/BsnfV8HIB5b2Q4V8CEA/BnCnFljb7ZqA7aNQMZmfmr/ToLoIaUdNyLJLHXZEdF8A 00sJhG5Nc62UrqlfdNeKnFg7XQA+6Iyof5Ijp9i1h5hnT9goo1WjGZMzb7pK6oRiVyIc nMWgLLgiOTVP1ZCLlEVqVs9MrmVASoZJ6F6v0DnS3J+xlZ4uUwPxUtqjrY1fGYabljeS ezkzt+blqLNWzsd6tLPvxy+DlHMxq126LUBJTekm8vj3QWapaFMUNKEo9IhdoIQzcYVF qmaewAifIK+xGBPuWbFzUDS0jn1brkru0QEwqpLFFQV5s88ijNK4XOy0lwPjDeUVoZSV 1Lmg== X-Gm-Message-State: AOAM5308g4a06ZqccMqY/sCQfPSK87JW+y0/AmqbbGdHOCjf3Hapb8QN bv45JJ4CwnwafCG52cGaQeUvB258bdw= X-Google-Smtp-Source: ABdhPJwE5QRMas4+J8u2/xwhktuRlyVOoA2E9U8HDw32BeONkGZwJFeKAJm/CO2sKvDWWiTH1lMKO062rcw= X-Received: from reiji-vws.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:15a3]) (user=reijiw job=sendgmr) by 2002:aa7:9d91:0:b0:44d:2778:561f with SMTP id f17-20020aa79d91000000b0044d2778561fmr6369522pfq.15.1634013405458; Mon, 11 Oct 2021 21:36:45 -0700 (PDT) Date: Mon, 11 Oct 2021 21:35:27 -0700 In-Reply-To: <20211012043535.500493-1-reijiw@google.com> Message-Id: <20211012043535.500493-18-reijiw@google.com> Mime-Version: 1.0 References: <20211012043535.500493-1-reijiw@google.com> X-Mailer: git-send-email 2.33.0.882.g93a45727a2-goog Subject: [RFC PATCH 17/25] KVM: arm64: Use vcpu->arch.mdcr_el2 to track value of mdcr_el2 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 Track the baseline guest value for mdcr_el2 in struct kvm_vcpu_arch. Use this value when setting mdcr_el2 for the guest. Currently this value is unchanged, but the following patches will set trapping bits based on features supported for the guest. No functional change intended. Signed-off-by: Reiji Watanabe --- arch/arm64/include/asm/kvm_arm.h | 16 ++++++++++++++++ arch/arm64/kvm/arm.c | 1 + arch/arm64/kvm/debug.c | 13 ++++--------- 3 files changed, 21 insertions(+), 9 deletions(-) diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h index f11ba1b6699d..e560e5549472 100644 --- a/arch/arm64/include/asm/kvm_arm.h +++ b/arch/arm64/include/asm/kvm_arm.h @@ -332,6 +332,22 @@ BIT(18) | \ GENMASK(16, 15)) +/* + * The default value for the guest below also clears MDCR_EL2_E2PB_MASK + * and MDCR_EL2_E2TB_MASK to disable guest access to the profiling and + * trace buffers. + */ +#define MDCR_GUEST_FLAGS_DEFAULT \ + (MDCR_EL2_TPM | MDCR_EL2_TPMS | MDCR_EL2_TTRF | \ + MDCR_EL2_TPMCR | MDCR_EL2_TDRA | MDCR_EL2_TDOSA) + +/* Bits that are copied from vcpu->arch.mdcr_el2 to set mdcr_el2 for guest. */ +#define MDCR_GUEST_FLAGS_TRACKED_MASK \ + (MDCR_EL2_TPM | MDCR_EL2_TPMS | MDCR_EL2_TTRF | \ + MDCR_EL2_TPMCR | MDCR_EL2_TDRA | MDCR_EL2_TDOSA | \ + (MDCR_EL2_E2PB_MASK << MDCR_EL2_E2PB_SHIFT)) + + /* For compatibility with fault code shared with 32-bit */ #define FSC_FAULT ESR_ELx_FSC_FAULT #define FSC_ACCESS ESR_ELx_FSC_ACCESS diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 32fd6edbd9e1..38301ddf8372 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -1108,6 +1108,7 @@ static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu, } vcpu_reset_hcr(vcpu); + vcpu->arch.mdcr_el2 = MDCR_GUEST_FLAGS_DEFAULT; if (has_vhe()) vcpu->arch.cptr_el2 = CPTR_EL2_VHE_GUEST_DEFAULT; else diff --git a/arch/arm64/kvm/debug.c b/arch/arm64/kvm/debug.c index db9361338b2a..83330968a411 100644 --- a/arch/arm64/kvm/debug.c +++ b/arch/arm64/kvm/debug.c @@ -84,16 +84,11 @@ void kvm_arm_init_debug(void) static void kvm_arm_setup_mdcr_el2(struct kvm_vcpu *vcpu) { /* - * This also clears MDCR_EL2_E2PB_MASK and MDCR_EL2_E2TB_MASK - * to disable guest access to the profiling and trace buffers + * Keep the vcpu->arch.mdcr_el2 bits that are specified by + * MDCR_GUEST_FLAGS_TRACKED_MASK. */ - vcpu->arch.mdcr_el2 = __this_cpu_read(mdcr_el2) & MDCR_EL2_HPMN_MASK; - vcpu->arch.mdcr_el2 |= (MDCR_EL2_TPM | - MDCR_EL2_TPMS | - MDCR_EL2_TTRF | - MDCR_EL2_TPMCR | - MDCR_EL2_TDRA | - MDCR_EL2_TDOSA); + vcpu->arch.mdcr_el2 &= MDCR_GUEST_FLAGS_TRACKED_MASK; + vcpu->arch.mdcr_el2 |= __this_cpu_read(mdcr_el2) & MDCR_EL2_HPMN_MASK; /* Is the VM being debugged by userspace? */ if (vcpu->guest_debug) -- 2.33.0.882.g93a45727a2-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm