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 A3DDEC433EF for ; Mon, 7 Mar 2022 14:51:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243622AbiCGOwl (ORCPT ); Mon, 7 Mar 2022 09:52:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45596 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243572AbiCGOwO (ORCPT ); Mon, 7 Mar 2022 09:52:14 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 7018090279 for ; Mon, 7 Mar 2022 06:51:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1646664668; 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=SBWkFgpgeF9UVavT67BPAf0/9XPzgwWECjGG8ZN+XCY=; b=eCsnIA4iHPL0+Da/O7uATrOdbvFvtPfTzLY4etVoDS4aF22p4hfb6QpCJSpyBAtNW8Lte9 S4b8EeaTdZ/OPORPgxaQO19/BXYzqFQ66l5TLF0Wu1loW4kV+8YIqIcOLrX/c1QG0qc3+f F2YHL5FeR2lLO4VEmqSK5RqQHBE9TlM= 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-30-IsdmmWARPM6l74CBAY8WeA-1; Mon, 07 Mar 2022 09:51:03 -0500 X-MC-Unique: IsdmmWARPM6l74CBAY8WeA-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 298228066F3; Mon, 7 Mar 2022 14:51:02 +0000 (UTC) Received: from fedora.redhat.com (unknown [10.40.193.244]) by smtp.corp.redhat.com (Postfix) with ESMTP id C9C357FFEF; Mon, 7 Mar 2022 14:50:59 +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 12/19] KVM: x86: hyper-v: Introduce kvm_hv_is_tlb_flush_hcall() Date: Mon, 7 Mar 2022 15:50:16 +0100 Message-Id: <20220307145023.1913205-13-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 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 137f906eb8c3..0c0877a6aa74 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); -- 2.35.1