From patchwork Mon Feb 7 15:54:42 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxim Levitsky X-Patchwork-Id: 12737583 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 7F75AC47080 for ; Mon, 7 Feb 2022 16:05:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1442165AbiBGQEa (ORCPT ); Mon, 7 Feb 2022 11:04:30 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39226 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1383313AbiBGQAc (ORCPT ); Mon, 7 Feb 2022 11:00:32 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id CC87EC0401CE for ; Mon, 7 Feb 2022 08:00:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1644249630; 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=uQ1uiq30ca/wtmdEmBkE1pSZd4AYgwDXu3pWHPnS4Sg=; b=DKthNpp6ft1+OIFATQB7lU0WK3Ozn7127Q9Lq2dw+7FBOMODuyN1tvKpXl6boZh7AH8BRC 2nX5CH+shdmUjJUW14J2fbNSeNFwUUy4NdnGJb8+xns/o5OIgygxHll6IbYMmYqUZiZIOm M3OmBN4+7sT7LkjCA9bOFqVIK9iFR0Q= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-669-go2mTwCUMJOBBfV8StMKZA-1; Mon, 07 Feb 2022 11:00:27 -0500 X-MC-Unique: go2mTwCUMJOBBfV8StMKZA-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 6588C8144E1; Mon, 7 Feb 2022 16:00:12 +0000 (UTC) Received: from localhost.localdomain (unknown [10.40.192.15]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0FC027DE38; Mon, 7 Feb 2022 15:59:49 +0000 (UTC) From: Maxim Levitsky To: kvm@vger.kernel.org Cc: Tony Luck , "Chang S. Bae" , Thomas Gleixner , Wanpeng Li , Ingo Molnar , Vitaly Kuznetsov , Pawan Gupta , Dave Hansen , Paolo Bonzini , linux-kernel@vger.kernel.org, Rodrigo Vivi , "H. Peter Anvin" , intel-gvt-dev@lists.freedesktop.org, Joonas Lahtinen , Joerg Roedel , Sean Christopherson , David Airlie , Zhi Wang , Brijesh Singh , Jim Mattson , x86@kernel.org, Daniel Vetter , Borislav Petkov , Zhenyu Wang , Kan Liang , Jani Nikula , Maxim Levitsky Subject: [PATCH RESEND 25/30] KVM: x86: nSVM: support PAUSE filter threshold and count when cpu_pm=on Date: Mon, 7 Feb 2022 17:54:42 +0200 Message-Id: <20220207155447.840194-26-mlevitsk@redhat.com> In-Reply-To: <20220207155447.840194-1-mlevitsk@redhat.com> References: <20220207155447.840194-1-mlevitsk@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Precedence: bulk List-ID: X-Mailing-List: kvm@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 bdcb23c76e89e..601d38ae05cc6 100644 --- a/arch/x86/kvm/svm/nested.c +++ b/arch/x86/kvm/svm/nested.c @@ -630,6 +630,12 @@ 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 0f068da098d9f..e49043807ec44 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -3997,6 +3997,17 @@ 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. */ @@ -4806,6 +4817,12 @@ 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); } diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index e8ffd458a5575..297ec57f9941c 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -222,6 +222,8 @@ 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;