From patchwork Thu Jan 6 04:27:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Reiji Watanabe X-Patchwork-Id: 12705105 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2618CC4332F for ; Thu, 6 Jan 2022 04:29:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233421AbiAFE3A (ORCPT ); Wed, 5 Jan 2022 23:29:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35908 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233227AbiAFE27 (ORCPT ); Wed, 5 Jan 2022 23:28:59 -0500 Received: from mail-pg1-x549.google.com (mail-pg1-x549.google.com [IPv6:2607:f8b0:4864:20::549]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EFBEBC0611FF for ; Wed, 5 Jan 2022 20:28:58 -0800 (PST) Received: by mail-pg1-x549.google.com with SMTP id v15-20020a637a0f000000b0034298b63d72so141766pgc.19 for ; Wed, 05 Jan 2022 20:28:58 -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=rEdrya4R7EAWDAJjebSC+VC2qaS3eoJJ5/ZClrOWefo=; b=mFVVx+f4D8/SFXD42xl4WFRSzKndQhwe5T+bCNe7iETFmIQn5fr7f7G7fKGHugveiC MdVVowrwqM63GzGSQYZa3rWwOiVqBjT9gDscjILRhZHm1a37JYYboqhcNqZPSqi7w1x4 fwcjRkZKJgJ8xKoHQrGwpfTdyDcd6P2IX0+++N1N7a9/MXNaFNEjVsa8CyOQAEwjZOFF k8p4v1QhZxthLsnqd4+DHqCP66/r2j5KcL72F9UOMXfxx4aGWzXMLs7IFLjuP9Dp/p4P WpFGm2Gh80WwYofsJNAjUh1CaXXDgDAUXtNkPiyvUCB3R45iIfMTtKZ2djwYPXD9b5QI ZtPg== 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=rEdrya4R7EAWDAJjebSC+VC2qaS3eoJJ5/ZClrOWefo=; b=TLwkib5ij1k/mrc27a5qxQ7DD54uxkwkOMMxPRfJGJRkR7SQMY6cb7CRARZ15UbcLh 7L8hgY55Y3/apOoBWomhhYvi2A8oH/VK1CcS/eHfpCcPPvzyESI7WT2UND+kxgwqTnu4 TErzzbeg6fvuI4fq1Yl8qtL5a9VP6jfGFwQvw4OSexmPRPpv9PtOe18Tn4yTp8HkaobJ KhHVHJgOZcNGi+t/P1mVaZGYPz+NphS8cyBnW9ox3ztQzC6RdtO7dpTEAHncE3QPOvXt tB9TTjHDedkD8pQHNZCvGCLtlk/fOG9IiWSnPyadhnaeAGddCIpvfhBF/y0MNSbVevYc +YzA== X-Gm-Message-State: AOAM530yt/5K11aU+mdZN2Q+66rdSx3E1dlzXLtMoqLsZMwp1Pju+xZP cOmoaFcFseJ/vofRkQPk4AsR8nYr6x0= X-Google-Smtp-Source: ABdhPJy2AzJ4dXEYZ6TOEhCN6GYfJcBpYNrBA+Xp2aeKLrzJFv/jwXhDdu631QeNioUI91ztAnrO1AQuGVg= X-Received: from reiji-vws-sp.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:3d59]) (user=reijiw job=sendgmr) by 2002:a63:80c7:: with SMTP id j190mr51661864pgd.41.1641443338434; Wed, 05 Jan 2022 20:28:58 -0800 (PST) Date: Wed, 5 Jan 2022 20:27:00 -0800 In-Reply-To: <20220106042708.2869332-1-reijiw@google.com> Message-Id: <20220106042708.2869332-19-reijiw@google.com> Mime-Version: 1.0 References: <20220106042708.2869332-1-reijiw@google.com> X-Mailer: git-send-email 2.34.1.448.ga2b2bfdf31-goog Subject: [RFC PATCH v4 18/26] 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, linux-arm-kernel@lists.infradead.org, James Morse , Alexandru Elisei , Suzuki K Poulose , Paolo Bonzini , Will Deacon , Andrew Jones , Peng Liang , Peter Shier , Ricardo Koller , Oliver Upton , Jing Zhang , Raghavendra Rao Anata , Reiji Watanabe Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org 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 8ab6ea038721..4b2ac9e32a36 100644 --- a/arch/arm64/include/asm/kvm_arm.h +++ b/arch/arm64/include/asm/kvm_arm.h @@ -333,6 +333,22 @@ 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 3700144f6271..33acbae7a7ed 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -1136,6 +1136,7 @@ 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)