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[2620:137:e000::3:5]) by mx.google.com with ESMTPS id r80-20020a632b53000000b005636ef310adsi4192693pgr.597.2023.09.22.09.13.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 Sep 2023 09:13:20 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:5 as permitted sender) client-ip=2620:137:e000::3:5; Authentication-Results: mx.google.com; dkim=pass header.i=@xen.org header.s=20200302mail header.b=RpTZGM5L; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:5 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by groat.vger.email (Postfix) with ESMTP id 7A49A8364287; Fri, 22 Sep 2023 08:01:04 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at groat.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232446AbjIVPAp (ORCPT + 29 others); Fri, 22 Sep 2023 11:00:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32770 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232197AbjIVPAg (ORCPT ); Fri, 22 Sep 2023 11:00:36 -0400 Received: from mail.xenproject.org (mail.xenproject.org [104.130.215.37]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4646619B; Fri, 22 Sep 2023 08:00:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=xen.org; s=20200302mail; h=Content-Transfer-Encoding:MIME-Version:References: In-Reply-To:Message-Id:Date:Subject:Cc:To:From; bh=cQ02ZWi3OXJZ36oKzuEnX4ff/ZDsG5TQqSf2+fKM4a0=; b=RpTZGM5L3MPK1fAd07Cxa9hJcR QYZrUH2zz8r5TuKok+L8rripfXPP3pTCsc45EHG42mXShuvzhdWsYDIn2T9Fob0JgGcyKMXwTL3Gc y1GubD9ftlVK2GS1crzblvVy+df36K8erTJHJo19wh5nWFLyA09bYnJu/KWqjFOmhZ80=; Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1qjhdm-00044b-Eg; Fri, 22 Sep 2023 15:00:22 +0000 Received: from ec2-63-33-11-17.eu-west-1.compute.amazonaws.com ([63.33.11.17] helo=REM-PW02S00X.ant.amazon.com) by xenbits.xenproject.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1qjhdm-0005y2-6O; Fri, 22 Sep 2023 15:00:22 +0000 From: Paul Durrant To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Paul Durrant , David Woodhouse , Sean Christopherson , David Woodhouse , Paolo Bonzini Subject: [PATCH v5 01/10] KVM: pfncache: add a map helper function Date: Fri, 22 Sep 2023 15:00:00 +0000 Message-Id: <20230922150009.3319-2-paul@xen.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230922150009.3319-1-paul@xen.org> References: <20230922150009.3319-1-paul@xen.org> MIME-Version: 1.0 X-Spam-Status: No, score=-0.8 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on groat.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (groat.vger.email [0.0.0.0]); Fri, 22 Sep 2023 08:01:04 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1777754911857217788 X-GMAIL-MSGID: 1777754911857217788 From: Paul Durrant We have an unmap helper but mapping is open-coded. Arguably this is fine because mapping is done in only one place, hva_to_pfn_retry(), but adding the helper does make that function more readable. No functional change intended. Signed-off-by: Paul Durrant Reviewed-by: David Woodhouse --- Cc: Sean Christopherson Cc: David Woodhouse Cc: Paolo Bonzini --- virt/kvm/pfncache.c | 43 +++++++++++++++++++++++++------------------ 1 file changed, 25 insertions(+), 18 deletions(-) diff --git a/virt/kvm/pfncache.c b/virt/kvm/pfncache.c index 2d6aba677830..0f36acdf577f 100644 --- a/virt/kvm/pfncache.c +++ b/virt/kvm/pfncache.c @@ -96,17 +96,28 @@ bool kvm_gpc_check(struct gfn_to_pfn_cache *gpc, unsigned long len) } EXPORT_SYMBOL_GPL(kvm_gpc_check); -static void gpc_unmap_khva(kvm_pfn_t pfn, void *khva) +static void *gpc_map(kvm_pfn_t pfn) +{ + if (pfn_valid(pfn)) + return kmap(pfn_to_page(pfn)); +#ifdef CONFIG_HAS_IOMEM + else + return memremap(pfn_to_hpa(pfn), PAGE_SIZE, MEMREMAP_WB); +#endif +} + +static void gpc_unmap(kvm_pfn_t pfn, void *khva) { /* Unmap the old pfn/page if it was mapped before. */ - if (!is_error_noslot_pfn(pfn) && khva) { - if (pfn_valid(pfn)) - kunmap(pfn_to_page(pfn)); + if (is_error_noslot_pfn(pfn) || !khva) + return; + + if (pfn_valid(pfn)) + kunmap(pfn_to_page(pfn)); #ifdef CONFIG_HAS_IOMEM - else - memunmap(khva); + else + memunmap(khva); #endif - } } static inline bool mmu_notifier_retry_cache(struct kvm *kvm, unsigned long mmu_seq) @@ -175,7 +186,7 @@ static kvm_pfn_t hva_to_pfn_retry(struct gfn_to_pfn_cache *gpc) * the existing mapping and didn't create a new one. */ if (new_khva != old_khva) - gpc_unmap_khva(new_pfn, new_khva); + gpc_unmap(new_pfn, new_khva); kvm_release_pfn_clean(new_pfn); @@ -193,15 +204,11 @@ static kvm_pfn_t hva_to_pfn_retry(struct gfn_to_pfn_cache *gpc) * too must be done outside of gpc->lock! */ if (gpc->usage & KVM_HOST_USES_PFN) { - if (new_pfn == gpc->pfn) { + if (new_pfn == gpc->pfn) new_khva = old_khva; - } else if (pfn_valid(new_pfn)) { - new_khva = kmap(pfn_to_page(new_pfn)); -#ifdef CONFIG_HAS_IOMEM - } else { - new_khva = memremap(pfn_to_hpa(new_pfn), PAGE_SIZE, MEMREMAP_WB); -#endif - } + else + new_khva = gpc_map(new_pfn); + if (!new_khva) { kvm_release_pfn_clean(new_pfn); goto out_error; @@ -326,7 +333,7 @@ static int __kvm_gpc_refresh(struct gfn_to_pfn_cache *gpc, gpa_t gpa, mutex_unlock(&gpc->refresh_lock); if (unmap_old) - gpc_unmap_khva(old_pfn, old_khva); + gpc_unmap(old_pfn, old_khva); return ret; } @@ -412,7 +419,7 @@ void kvm_gpc_deactivate(struct gfn_to_pfn_cache *gpc) list_del(&gpc->list); spin_unlock(&kvm->gpc_lock); - gpc_unmap_khva(old_pfn, old_khva); + gpc_unmap(old_pfn, old_khva); } } EXPORT_SYMBOL_GPL(kvm_gpc_deactivate);