From patchwork Thu Nov 4 00:25:20 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Christopherson X-Patchwork-Id: 12602049 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D1AD7C4321E for ; Thu, 4 Nov 2021 00:27:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BEE43611EE for ; Thu, 4 Nov 2021 00:27:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233319AbhKDAaL (ORCPT ); Wed, 3 Nov 2021 20:30:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52744 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233381AbhKDA3I (ORCPT ); Wed, 3 Nov 2021 20:29:08 -0400 Received: from mail-pl1-x64a.google.com (mail-pl1-x64a.google.com [IPv6:2607:f8b0:4864:20::64a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8C809C061205 for ; Wed, 3 Nov 2021 17:26:31 -0700 (PDT) Received: by mail-pl1-x64a.google.com with SMTP id q2-20020a170902dac200b001422673d86fso1025467plx.20 for ; Wed, 03 Nov 2021 17:26:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=reply-to:date:in-reply-to:message-id:mime-version:references :subject:from:to:cc; bh=uYjj4f3K7aLt9wIaWKUjF6y1lKdICOYwfejCWHB3aF8=; b=Uhm3v8WNND1uUP79qkh3iF9ngMS/QpmsXEC/6vevUuzviyfyF3+tSzE2rdmLrNYnov ivEPHlTaSTgUBPTTi0LsyRVmw9xXp2mzAafjmpRwoFL1KovVk8wtgK3U+1IWl+jiRT2o 7QOXBMeLcoMyFIuk8nfYq8Z4cK4ySxLX4VQvCwivT4uBC8D1531XJeoZcVX+WcQdgv/2 15XpbR3gJyAolfjM0WcGNgJS3ceK1iyuvg9S+WhHGJq+B2HdNn7lGmW8IZ2NF2RpaP0n 2NlCasOBpN6Ngo/ODMi6fT9lbV6fzIJZALi7PZVoZsnpUFpAWoSzDGNfxoR0u+D8gkJP KhsQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:reply-to:date:in-reply-to:message-id :mime-version:references:subject:from:to:cc; bh=uYjj4f3K7aLt9wIaWKUjF6y1lKdICOYwfejCWHB3aF8=; b=TENGEU1DsLPZFgmZ29OQ7ci9QZ1Eo/MwLnQj276zjFRoDOeEnhjQd6n7hA7KKe2WHp nX+/l+EidkeVVuvbdmfXyd8TPYFazLYiYNKxkd9Zm5UNjFkY9Nov3WYuFyeZIeoc6KZq 772CSXr7jleMCLglTAMU7k9g7jNnwnVfq/IRiCLSj1nGeRflOS8/X63nwmly6b17WEZz Jd8YyZw4fW5n4yUpos2u5VhiDWpGJBoiNrUpTpbcoEESIztuXT6ooGZ2jhajI8o8Wudk 3ryuolQ6RxB51my653nnUmTESPkELgQpQD6+TQYSuo2rTvhSJ9mp6VY62u0ZIg8Ofvui QnGg== X-Gm-Message-State: AOAM531Bl31Th/TvUZL24jTCEhrmIKCJA2CivdIVIzOmNY7W+OfEy1/e crJoc20m9E0pBiWcZ0Fp/Ft9aKGtRtw= X-Google-Smtp-Source: ABdhPJyzJUVQ4+X7UL4YhSp9RCZBPi0XLOQZSFtg0LZxrgaDfXLCgqmWWI3ojjh232hTQrMrLyr2UsSbIBM= X-Received: from seanjc.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:3e5]) (user=seanjc job=sendgmr) by 2002:a05:6a00:1511:b0:492:61fe:9fa6 with SMTP id q17-20020a056a00151100b0049261fe9fa6mr9114017pfu.57.1635985590891; Wed, 03 Nov 2021 17:26:30 -0700 (PDT) Reply-To: Sean Christopherson Date: Thu, 4 Nov 2021 00:25:20 +0000 In-Reply-To: <20211104002531.1176691-1-seanjc@google.com> Message-Id: <20211104002531.1176691-20-seanjc@google.com> Mime-Version: 1.0 References: <20211104002531.1176691-1-seanjc@google.com> X-Mailer: git-send-email 2.33.1.1089.g2158813163f-goog Subject: [PATCH v5.5 19/30] KVM: x86: Don't call kvm_mmu_change_mmu_pages() if the count hasn't changed From: Sean Christopherson To: Marc Zyngier , Huacai Chen , Aleksandar Markovic , Paul Mackerras , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank , Paolo Bonzini Cc: James Morse , Alexandru Elisei , Suzuki K Poulose , Atish Patra , David Hildenbrand , Cornelia Huck , Claudio Imbrenda , Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org, kvm@vger.kernel.org, kvm-ppc@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Ben Gardon , "Maciej S . Szmigiero" Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org There is no point in calling kvm_mmu_change_mmu_pages() for memslot operations that don't change the total page count, so do it just for KVM_MR_CREATE and KVM_MR_DELETE. Reviewed-by: Sean Christopherson Signed-off-by: Maciej S. Szmigiero Signed-off-by: Sean Christopherson --- arch/x86/kvm/x86.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 80183f7eadeb..4b0cb7390902 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -11836,7 +11836,8 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, const struct kvm_memory_slot *new, enum kvm_mr_change change) { - if (!kvm->arch.n_requested_mmu_pages) + if (!kvm->arch.n_requested_mmu_pages && + (change == KVM_MR_CREATE || change == KVM_MR_DELETE)) kvm_mmu_change_mmu_pages(kvm, kvm_mmu_calculate_default_mmu_pages(kvm));