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 9A748C6FA82 for ; Wed, 21 Sep 2022 17:01:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231193AbiIURBX (ORCPT ); Wed, 21 Sep 2022 13:01:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50998 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231192AbiIURAp (ORCPT ); Wed, 21 Sep 2022 13:00:45 -0400 Received: from mail-pj1-x102a.google.com (mail-pj1-x102a.google.com [IPv6:2607:f8b0:4864:20::102a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2BD596F54F for ; Wed, 21 Sep 2022 10:00:38 -0700 (PDT) Received: by mail-pj1-x102a.google.com with SMTP id bu5-20020a17090aee4500b00202e9ca2182so4059595pjb.0 for ; Wed, 21 Sep 2022 10:00:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date; bh=XOa4aurffGm0tCv2VayZ1RuwmmJV/QHgF+XodULO/e4=; b=M1thJhs3crptdcTk9AppPMG4GQTA+ygwGlHofw5z+VfZQZzJzJRuWgcYw7wA6BJReQ 4c/ax5qtQesPHD6rKMfjnzVcGgn05tLTCPaGLf2qaezxvI3hVaSXXZBXutYZfYAemGji Lak86dQ6DnlPGIc4MIUIt33+x4D/WKGPUgbvID95muAzoiMdPwhfqQF1JG5juAe7r+c5 3u2gyKd2+b0NVJRe6jPFyRG2Xz+KqDIjqnzG0F9H0s/2LMRE8Yho3PZPz5HvL6PP3wt5 xQN3OgVAAk+5nCKTImUjnWiN2LIiGq7DTqD7lCWE5IzK/gjwCQmLySJmIqpT6yWMJrlL q9ng== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date; bh=XOa4aurffGm0tCv2VayZ1RuwmmJV/QHgF+XodULO/e4=; b=ARDy1Px9Kxme9jG8ua0GIcVubYdx3OZ4YDj4xcOiomZ0woMJAltlBUx30iA/DMRERD k/O6kRTNpB69AQ77lUZd+tk3XU81od8/Y3ommIDbZg0ZeqjPrO9KFnQnRrAoTnZh83+G jo6qv7bzbORQRFrvBhX6dW1e9TX/qPAqb5lZEhkDE6ru3fcT9aE4WH6+seXfrk4VVtGW SsYMVciB6GkuQthGjWwMNTKpF+M4aZvBGYvfl43dx2AV3gXvdNfw9j1/6E3Vscuicpl+ kXUu0pWVt+FB70JURA70rP5f5UX1U9YQpHwg0eyniKx5f4UTn/fBokJVL1PSclUZuCVz YH7Q== X-Gm-Message-State: ACrzQf18AeParRnaEPl4sZSrrRqbQOIOovDF04tF325v/6BUAMVT294L +K3pcE1sghzmDpLGYjuZnMhOtA== X-Google-Smtp-Source: AMsMyM5uqALCb8WGeHhzM8f0JqsMbjmUyhG8VuxXHzkBcroII1eIs3TfX4LfvlzwPp5mJshCSi1Nxg== X-Received: by 2002:a17:90a:9f07:b0:203:5a3:1d25 with SMTP id n7-20020a17090a9f0700b0020305a31d25mr10962125pjp.74.1663779637571; Wed, 21 Sep 2022 10:00:37 -0700 (PDT) Received: from google.com (7.104.168.34.bc.googleusercontent.com. [34.168.104.7]) by smtp.gmail.com with ESMTPSA id i9-20020a17090332c900b00176b63535ccsm2291536plr.193.2022.09.21.10.00.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Sep 2022 10:00:37 -0700 (PDT) Date: Wed, 21 Sep 2022 17:00:33 +0000 From: Sean Christopherson To: Vitaly Kuznetsov Cc: kvm@vger.kernel.org, Paolo Bonzini , Wanpeng Li , Jim Mattson , Michael Kelley , Siddharth Chandrasekaran , Yuan Yao , Maxim Levitsky , linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v10 05/39] KVM: x86: hyper-v: Handle HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST{,EX} calls gently Message-ID: References: <20220921152436.3673454-1-vkuznets@redhat.com> <20220921152436.3673454-6-vkuznets@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220921152436.3673454-6-vkuznets@redhat.com> Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org On Wed, Sep 21, 2022, Vitaly Kuznetsov wrote: > void kvm_hv_vcpu_flush_tlb(struct kvm_vcpu *vcpu) > { > struct kvm_vcpu_hv_tlb_flush_fifo *tlb_flush_fifo; > struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu); > + u64 entries[KVM_HV_TLB_FLUSH_FIFO_SIZE]; > + int i, j, count; > + gva_t gva; > > - kvm_vcpu_flush_tlb_guest(vcpu); > - > - if (!hv_vcpu) > + if (!tdp_enabled || !hv_vcpu) { > + kvm_vcpu_flush_tlb_guest(vcpu); > return; > + } > > tlb_flush_fifo = &hv_vcpu->tlb_flush_fifo; > > + count = kfifo_out(&tlb_flush_fifo->entries, entries, KVM_HV_TLB_FLUSH_FIFO_SIZE); > + > + for (i = 0; i < count; i++) { > + if (entries[i] == KVM_HV_TLB_FLUSHALL_ENTRY) > + goto out_flush_all; > + > + /* > + * Lower 12 bits of 'address' encode the number of additional > + * pages to flush. > + */ > + gva = entries[i] & PAGE_MASK; > + for (j = 0; j < (entries[i] & ~PAGE_MASK) + 1; j++) > + static_call(kvm_x86_flush_tlb_gva)(vcpu, gva + j * PAGE_SIZE); > + > + ++vcpu->stat.tlb_flush; > + } > + return; > + > +out_flush_all: > + kvm_vcpu_flush_tlb_guest(vcpu); > kfifo_reset_out(&tlb_flush_fifo->entries); > } If kvm_vcpu_flush_tlb_guest() is done as a fallback, then this can use -ENOSPC, which again I like from a documentation perspective. out_flush_all: kfifo_reset_out(&tlb_flush_fifo->entries); return -ENOSPC;