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 AFE93C433FE for ; Tue, 12 Oct 2021 04:36:42 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 6315861074 for ; Tue, 12 Oct 2021 04:36:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 6315861074 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 199444B0E2; Tue, 12 Oct 2021 00:36:42 -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 1eCHsivKjVY7; Tue, 12 Oct 2021 00:36:41 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id E1CDB4B128; Tue, 12 Oct 2021 00:36:39 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 639BC4B11B for ; Tue, 12 Oct 2021 00:36:39 -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 BSx9gJknW0Na for ; Tue, 12 Oct 2021 00:36:38 -0400 (EDT) Received: from mail-pg1-f201.google.com (mail-pg1-f201.google.com [209.85.215.201]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id D1FD64B0DF for ; Tue, 12 Oct 2021 00:36:36 -0400 (EDT) Received: by mail-pg1-f201.google.com with SMTP id u5-20020a63d3450000b029023a5f6e6f9bso8017400pgi.21 for ; Mon, 11 Oct 2021 21:36:36 -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=cwGN9Xe3XWxW643nb96+bXhhQ/Ir7xJT1HwtMeHM7cQ=; b=DBUBOXq/KtFBlinyQ1LBw4GMEMeHuJzh2MUTnjINtr2KUrltQAUA/+vj8wI0Fk5ST3 XiWsa2domVcF8x4i7LPxC0hj8GAwn/DPal9Zqj1qoljPzYPMatgwIia0NMQQqWKOxdYE LeLft6vpRTZbBcHr0bemhAlKRQCe5qJgGwKhn2+w35t4snNcehqQb2g0rsw1RIOdYFU9 bAiPujoV+AaVBXHt8l6+A821yQN76n/5eHRiIh9+1xoDs8dHcReaRoDiKfQOBKkSwGZP HVYmsNdv0YnE0MVnp1hIZAk+puV5zvweS0KhO09Xkis/O6oEEaP7NKkHSlBTNJZEgphI qdnA== 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=cwGN9Xe3XWxW643nb96+bXhhQ/Ir7xJT1HwtMeHM7cQ=; b=1VLwTK5kMz5/OMMZrPXL6/W+Y1zTOp/ev4re8ZBSdH1e2O1YVJfzj5TvZ884Udg4f/ u2Xhps4OTRO16ZwjL+wBgS3mbkdzTePjtIXAa0dx8MASfBTvVF6Nx/+C7JQ7xL3uwqyq 8lqokpZ75+uWLTvrCplgB5hWtRtM7LtOjGC0YocJAAJaiafj1P/l4jdXOlC0N/198Dbv UFD5Z79V3j54TKKEMFBXfS2MFD5FDZO0RXzWIjyeqbcYrRHL3IneJUwSHUoWB22zufeg 89kVu/rjoMWbOFurcBnDpS/tH+bOibCDrI549mg+1UaBWpi3CnjzJLDN5ZFDnV8Qydeu 6mKw== X-Gm-Message-State: AOAM532TdVEydwXl0MC7RJF+9cUlrsT7g3RpLNG3v1vyCA9eGq/taB3V qdXlQSRCQwn5+uj5/0SqzXzIgC9dCq8= X-Google-Smtp-Source: ABdhPJy8CGkD4X+vedywWNr5lgYqfM+G5c5VEXo+GN+CPYbQ23SjsxTScLeFIEMAadLh5UzZSK8h53NYvAg= X-Received: from reiji-vws.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:15a3]) (user=reijiw job=sendgmr) by 2002:a17:90a:8b8d:: with SMTP id z13mr296126pjn.0.1634013395790; Mon, 11 Oct 2021 21:36:35 -0700 (PDT) Date: Mon, 11 Oct 2021 21:35:21 -0700 In-Reply-To: <20211012043535.500493-1-reijiw@google.com> Message-Id: <20211012043535.500493-12-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 11/25] KVM: arm64: Make ID_DFR0_EL1 writable 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 This patch adds id_reg_info for ID_DFR0_EL1 to make it writable by userspace. Return an error if userspace tries to set PerfMon field of the register to a value that conflicts with the PMU configuration. Signed-off-by: Reiji Watanabe --- arch/arm64/kvm/sys_regs.c | 57 +++++++++++++++++++++++++++++++-------- 1 file changed, 46 insertions(+), 11 deletions(-) diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 61e61f4bb81c..84c064dfc63a 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -442,6 +442,25 @@ static int validate_id_aa64dfr0_el1(struct kvm_vcpu *vcpu, u64 val) return 0; } +static int validate_id_dfr0_el1(struct kvm_vcpu *vcpu, u64 val) +{ + bool vcpu_pmu = kvm_vcpu_has_pmu(vcpu); + unsigned int perfmon = cpuid_feature_extract_unsigned_field(val, + ID_DFR0_PERFMON_SHIFT); + bool dfr0_pmu = id_reg_has_pmu(val, ID_DFR0_PERFMON_SHIFT, + ID_DFR0_PERFMON_8_0); + + if (perfmon == 1 || perfmon == 2) + /* PMUv1 or PMUv2 is not allowed on ARMv8. */ + return -EINVAL; + + /* Check if there is a conflict with a request via KVM_ARM_VCPU_INIT */ + if (vcpu_pmu ^ dfr0_pmu) + return -EPERM; + + return 0; +} + static void init_id_aa64pfr0_el1_info(struct id_reg_info *id_reg) { u64 limit; @@ -526,6 +545,16 @@ static void init_id_aa64dfr0_el1_info(struct id_reg_info *id_reg) id_reg->vcpu_limit_val = limit; } +static void init_id_dfr0_el1_info(struct id_reg_info *id_reg) +{ + id_reg->sys_val = read_sanitised_ftr_reg(id_reg->sys_reg); + + /* Limit guests to PMUv3 for ARMv8.4 */ + id_reg->vcpu_limit_val = id_reg_cap_pmu(id_reg->sys_val, + ID_DFR0_PERFMON_SHIFT, + ID_DFR0_PERFMON_8_4); +} + static u64 get_reset_id_aa64pfr0_el1(struct kvm_vcpu *vcpu, struct id_reg_info *idr) { @@ -557,6 +586,14 @@ static u64 get_reset_id_aa64dfr0_el1(struct kvm_vcpu *vcpu, (idr->vcpu_limit_val & ~(ARM64_FEATURE_MASK(ID_AA64DFR0_PMUVER))); } +static u64 get_reset_id_dfr0_el1(struct kvm_vcpu *vcpu, + struct id_reg_info *idr) +{ + return kvm_vcpu_has_pmu(vcpu) ? + idr->vcpu_limit_val : + (idr->vcpu_limit_val & ~(ARM64_FEATURE_MASK(ID_DFR0_PERFMON))); +} + static struct id_reg_info id_aa64pfr0_el1_info = { .sys_reg = SYS_ID_AA64PFR0_EL1, .init = init_id_aa64pfr0_el1_info, @@ -593,6 +630,13 @@ static struct id_reg_info id_aa64dfr0_el1_info = { .get_reset_val = get_reset_id_aa64dfr0_el1, }; +static struct id_reg_info id_dfr0_el1_info = { + .sys_reg = SYS_ID_DFR0_EL1, + .init = init_id_dfr0_el1_info, + .validate = validate_id_dfr0_el1, + .get_reset_val = get_reset_id_dfr0_el1, +}; + /* * An ID register that needs special handling to control the value for the * guest must have its own id_reg_info in id_reg_info_table. @@ -602,6 +646,7 @@ static struct id_reg_info id_aa64dfr0_el1_info = { */ #define GET_ID_REG_INFO(id) (id_reg_info_table[IDREG_IDX(id)]) static struct id_reg_info *id_reg_info_table[KVM_ARM_ID_REG_MAX_NUM] = { + [IDREG_IDX(SYS_ID_DFR0_EL1)] = &id_dfr0_el1_info, [IDREG_IDX(SYS_ID_AA64PFR0_EL1)] = &id_aa64pfr0_el1_info, [IDREG_IDX(SYS_ID_AA64PFR1_EL1)] = &id_aa64pfr1_el1_info, [IDREG_IDX(SYS_ID_AA64DFR0_EL1)] = &id_aa64dfr0_el1_info, @@ -1440,18 +1485,8 @@ static u64 read_id_reg(const struct kvm_vcpu *vcpu, struct sys_reg_desc const *r, bool raz) { u32 id = reg_to_encoding(r); - u64 val = raz ? 0 : __vcpu_sys_reg(vcpu, IDREG_SYS_IDX(id)); - switch (id) { - case SYS_ID_DFR0_EL1: - /* Limit guests to PMUv3 for ARMv8.4 */ - val = cpuid_feature_cap_perfmon_field(val, - ID_DFR0_PERFMON_SHIFT, - kvm_vcpu_has_pmu(vcpu) ? ID_DFR0_PERFMON_8_4 : 0); - break; - } - - return val; + return raz ? 0 : __vcpu_sys_reg(vcpu, IDREG_SYS_IDX(id)); } static unsigned int id_visibility(const struct kvm_vcpu *vcpu, -- 2.33.0.882.g93a45727a2-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm