From patchwork Thu Apr 7 15:56:26 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitaly Kuznetsov X-Patchwork-Id: 12805453 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 9217CC433EF for ; Thu, 7 Apr 2022 15:57:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345331AbiDGP7b (ORCPT ); Thu, 7 Apr 2022 11:59:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47344 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345334AbiDGP7V (ORCPT ); Thu, 7 Apr 2022 11:59:21 -0400 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 64771CD64D for ; Thu, 7 Apr 2022 08:57:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1649347038; 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=c7ur2jhm1CbAvmCE2zq5ASE03ZEeiT3sbkr6ioIGwDo=; b=G/MI/7/1CHd/B7vKLz+iaTuJcZzh+1JASsYs4WeU0XMLt4kXaiYskr1tc2VPVHYI01pZYA 3IasH+vYqYtjw8en6LD6l+1Giyz+IXRCQSJbzXAgJkNtpDWg44QT5Sk/r020ZmgH3O9qeh AkNO9jPzaoj78YLvdDmYdqV3L1n3OIg= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-417-3ZG-Xf-eO-G7vuNS5HppuQ-1; Thu, 07 Apr 2022 11:57:15 -0400 X-MC-Unique: 3ZG-Xf-eO-G7vuNS5HppuQ-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 11CA61C04B4A; Thu, 7 Apr 2022 15:57:15 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.40.192.50]) by smtp.corp.redhat.com (Postfix) with ESMTP id 669F254AC84; Thu, 7 Apr 2022 15:57:13 +0000 (UTC) From: Vitaly Kuznetsov To: kvm@vger.kernel.org, Paolo Bonzini Cc: Sean Christopherson , Wanpeng Li , Jim Mattson , Michael Kelley , Siddharth Chandrasekaran , linux-kernel@vger.kernel.org Subject: [PATCH v2 12/31] KVM: x86: hyper-v: Introduce kvm_hv_is_tlb_flush_hcall() Date: Thu, 7 Apr 2022 17:56:26 +0200 Message-Id: <20220407155645.940890-13-vkuznets@redhat.com> In-Reply-To: <20220407155645.940890-1-vkuznets@redhat.com> References: <20220407155645.940890-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.85 on 10.11.54.9 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The newly introduced helper checks whether vCPU is performing a Hyper-V TLB flush hypercall. This is required to filter out Direct TLB flush hypercalls from L2 for processing. Signed-off-by: Vitaly Kuznetsov --- arch/x86/kvm/hyperv.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h index 448877b478ef..3687e1e61e0d 100644 --- a/arch/x86/kvm/hyperv.h +++ b/arch/x86/kvm/hyperv.h @@ -168,6 +168,30 @@ static inline void kvm_hv_vcpu_empty_flush_tlb(struct kvm_vcpu *vcpu) tlb_flush_ring = kvm_hv_get_tlb_flush_ring(vcpu); tlb_flush_ring->read_idx = tlb_flush_ring->write_idx; } + +static inline bool kvm_hv_is_tlb_flush_hcall(struct kvm_vcpu *vcpu) +{ + struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); + u16 code; + + if (!hv_vcpu) + return false; + +#ifdef CONFIG_X86_64 + if (is_64_bit_hypercall(vcpu)) { + code = kvm_rcx_read(vcpu) & 0xffff; + } else +#endif + { + code = kvm_rax_read(vcpu) & 0xffff; + } + + return (code == HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE || + code == HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST || + code == HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX || + code == HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX); +} + void kvm_hv_vcpu_flush_tlb(struct kvm_vcpu *vcpu);