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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0E324C43217 for ; Mon, 7 Mar 2022 14:52:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243513AbiCGOxj (ORCPT ); Mon, 7 Mar 2022 09:53:39 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45486 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243589AbiCGOwa (ORCPT ); Mon, 7 Mar 2022 09:52:30 -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 6069490FC8 for ; Mon, 7 Mar 2022 06:51:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1646664672; 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=AJxhfbbUpp3TCfbP2M1jKurKEmQJOIdOoRd+GiZKb4c=; b=bqxyjQoOYIbywMw7Q6EKNjm3xLnQkXyGN6YS9aCvDm5o+f6lIXGOl80r/5tdddCOngLymp /y7t52BUqtRWcTK2jif++aGcfxfkEk2FXTNcTpPomTnCdzxG5F26h+tM30V/b5oeLlrDcg AcBUMFuKTJQoprqTuKrjR+ZB+noBtFM= 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-219-041ypFUNM-uLvCoahMND_g-1; Mon, 07 Mar 2022 09:51:09 -0500 X-MC-Unique: 041ypFUNM-uLvCoahMND_g-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 4FC618066F3; Mon, 7 Mar 2022 14:51:07 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.40.193.244]) by smtp.corp.redhat.com (Postfix) with ESMTP id 32E577F0D6; Mon, 7 Mar 2022 14:51:05 +0000 (UTC) From: Vitaly Kuznetsov To: kvm@vger.kernel.org Cc: Paolo Bonzini , Sean Christopherson , Wanpeng Li , Jim Mattson , linux-hyperv@vger.kernel.org, Siddharth Chandrasekaran , linux-kernel@vger.kernel.org Subject: [PATCH RFC 14/19] KVM: x86: hyper-v: Introduce fast kvm_hv_direct_tlb_flush_exposed() check Date: Mon, 7 Mar 2022 15:50:18 +0100 Message-Id: <20220307145023.1913205-15-vkuznets@redhat.com> In-Reply-To: <20220307145023.1913205-1-vkuznets@redhat.com> References: <20220307145023.1913205-1-vkuznets@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introduce a helper to quickly check if KVM needs to handle VMCALL/VMMCALL from L2 in L0 to process Direct TLB flush requests. Signed-off-by: Vitaly Kuznetsov --- arch/x86/include/asm/kvm_host.h | 1 + arch/x86/kvm/hyperv.c | 6 ++++++ arch/x86/kvm/hyperv.h | 7 +++++++ 3 files changed, 14 insertions(+) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 45ee05f4f1a0..bcaf05951628 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -611,6 +611,7 @@ struct kvm_vcpu_hv { u32 enlightenments_eax; /* HYPERV_CPUID_ENLIGHTMENT_INFO.EAX */ u32 enlightenments_ebx; /* HYPERV_CPUID_ENLIGHTMENT_INFO.EBX */ u32 syndbg_cap_eax; /* HYPERV_CPUID_SYNDBG_PLATFORM_CAPABILITIES.EAX */ + u32 nested_features_eax; /* HYPERV_CPUID_NESTED_FEATURES.EAX */ } cpuid_cache; /* Two rings for regular Hyper-V TLB flush and Direct TLB flush */ diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index 865b4d9a26fe..31acc08a6b23 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -2270,6 +2270,12 @@ void kvm_hv_set_cpuid(struct kvm_vcpu *vcpu) hv_vcpu->cpuid_cache.syndbg_cap_eax = entry->eax; else hv_vcpu->cpuid_cache.syndbg_cap_eax = 0; + + entry = kvm_find_cpuid_entry(vcpu, HYPERV_CPUID_NESTED_FEATURES, 0); + if (entry) + hv_vcpu->cpuid_cache.nested_features_eax = entry->eax; + else + hv_vcpu->cpuid_cache.nested_features_eax = 0; } int kvm_hv_set_enforce_cpuid(struct kvm_vcpu *vcpu, bool enforce) diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h index 0c0877a6aa74..0c9062aed182 100644 --- a/arch/x86/kvm/hyperv.h +++ b/arch/x86/kvm/hyperv.h @@ -169,6 +169,13 @@ static inline void kvm_hv_vcpu_empty_flush_tlb(struct kvm_vcpu *vcpu) tlb_flush_ring->read_idx = tlb_flush_ring->write_idx; } +static inline bool kvm_hv_direct_tlb_flush_exposed(struct kvm_vcpu *vcpu) +{ + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); + + return hv_vcpu && (hv_vcpu->cpuid_cache.nested_features_eax & HV_X64_NESTED_DIRECT_FLUSH); +} + static inline bool kvm_hv_is_tlb_flush_hcall(struct kvm_vcpu *vcpu) { struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); -- 2.35.1