From patchwork Mon Nov 1 14:03:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxim Levitsky X-Patchwork-Id: 12596481 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 22AB8C433FE for ; Mon, 1 Nov 2021 14:04:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0BF8D610E8 for ; Mon, 1 Nov 2021 14:04:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232519AbhKAOHY (ORCPT ); Mon, 1 Nov 2021 10:07:24 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:27729 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232403AbhKAOHX (ORCPT ); Mon, 1 Nov 2021 10:07:23 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1635775489; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=xqFACOXhEcJG3lG05yOBjnRQCBdeh1h+5Q34ehwpRUE=; b=TMTgiSLpe6QAlcffZa8cME6u5jhtNwc7gmf3NZceFSG1lLWk/u2cBNfDzQhgYnEcONguCn eJWGjSXEA/WmR2trk9ACAxywewuRynDAs15UvSCYPxQu8dFhMhuFkSKNsjy2kQR+q2aSYz JLMBoscqJnw82CLrbYjX4JSLgtn8yz8= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-450-Rw_TfYVRMuqm9FzZilBEuw-1; Mon, 01 Nov 2021 10:04:44 -0400 X-MC-Unique: Rw_TfYVRMuqm9FzZilBEuw-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 7E48680A5C0; Mon, 1 Nov 2021 14:04:42 +0000 (UTC) Received: from localhost.localdomain (unknown [10.40.194.243]) by smtp.corp.redhat.com (Postfix) with ESMTP id B69D8101E5AE; Mon, 1 Nov 2021 14:04:37 +0000 (UTC) From: Maxim Levitsky To: kvm@vger.kernel.org Cc: Shuah Khan , linux-kselftest@vger.kernel.org (open list:KERNEL SELFTEST FRAMEWORK), Borislav Petkov , Paolo Bonzini , linux-kernel@vger.kernel.org (open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)), Joerg Roedel , "H. Peter Anvin" , Maxim Levitsky , Thomas Gleixner , Vitaly Kuznetsov , Bandan Das , Wanpeng Li , Jim Mattson , Sean Christopherson , Wei Huang , x86@kernel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)), Ingo Molnar Subject: [PATCH v2 5/6] KVM: x86: nSVM: support PAUSE filter threshold and count when cpu_pm=on Date: Mon, 1 Nov 2021 16:03:23 +0200 Message-Id: <20211101140324.197921-6-mlevitsk@redhat.com> In-Reply-To: <20211101140324.197921-1-mlevitsk@redhat.com> References: <20211101140324.197921-1-mlevitsk@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Allow L1 to use these settings if L0 disables PAUSE interception (AKA cpu_pm=on) Signed-off-by: Maxim Levitsky --- arch/x86/kvm/svm/nested.c | 6 ++++++ arch/x86/kvm/svm/svm.c | 17 +++++++++++++++++ arch/x86/kvm/svm/svm.h | 2 ++ 3 files changed, 25 insertions(+) diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c index 2dc97cca68f7c..15be37368380d 100644 --- a/arch/x86/kvm/svm/nested.c +++ b/arch/x86/kvm/svm/nested.c @@ -617,6 +617,12 @@ static void nested_vmcb02_prepare_control(struct vcpu_svm *svm) if (!nested_vmcb_needs_vls_intercept(svm)) svm->vmcb->control.virt_ext |= VIRTUAL_VMLOAD_VMSAVE_ENABLE_MASK; + if (svm->pause_filter_enabled) + svm->vmcb->control.pause_filter_count = svm->nested.ctl.pause_filter_count; + + if (svm->pause_threshold_enabled) + svm->vmcb->control.pause_filter_thresh = svm->nested.ctl.pause_filter_thresh; + nested_svm_transition_tlb_flush(vcpu); /* Enter Guest-Mode */ diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 77fd0922c4060..ff1447a3551fc 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -1026,6 +1026,12 @@ static __init void svm_set_cpu_caps(void) if (vls) kvm_cpu_cap_set(X86_FEATURE_V_VMSAVE_VMLOAD); + if (pause_filter_count) + kvm_cpu_cap_set(X86_FEATURE_PAUSEFILTER); + + if (pause_filter_thresh) + kvm_cpu_cap_set(X86_FEATURE_PFTHRESHOLD); + /* Nested VM can receive #VMEXIT instead of triggering #GP */ kvm_cpu_cap_set(X86_FEATURE_SVME_ADDR_CHK); } @@ -4163,6 +4169,17 @@ static void svm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu) svm->v_vmload_vmsave_enabled = vls && guest_cpuid_has(vcpu, X86_FEATURE_V_VMSAVE_VMLOAD); + if (kvm_pause_in_guest(vcpu->kvm)) { + svm->pause_filter_enabled = pause_filter_count > 0 && + guest_cpuid_has(vcpu, X86_FEATURE_PAUSEFILTER); + + svm->pause_threshold_enabled = pause_filter_thresh > 0 && + guest_cpuid_has(vcpu, X86_FEATURE_PFTHRESHOLD); + } else { + svm->pause_filter_enabled = false; + svm->pause_threshold_enabled = false; + } + svm_recalc_instruction_intercepts(vcpu, svm); /* For sev guests, the memory encryption bit is not reserved in CR3. */ diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index ec8dd09e41e69..75781d66cbd60 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -166,6 +166,8 @@ struct vcpu_svm { bool tsc_scaling_enabled : 1; bool lbrv_enabled : 1; bool v_vmload_vmsave_enabled : 1; + bool pause_filter_enabled : 1; + bool pause_threshold_enabled : 1; u32 ldr_reg; u32 dfr_reg;