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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6DC8FC00528 for ; Thu, 3 Aug 2023 19:16:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:From:Subject:Message-ID: References:Mime-Version:In-Reply-To:Date:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=/X3UKahStBt+P7aX0i0BntgDMUKPM5FN0emTGI0Ziyg=; b=cboko/PTYAODjRsKoTKLtZQzRz 6tygG9N1lKw2iZBTOvkOSBFo5a96ndFu4E/xCLsz1+5Fj0HCCrE1rfNSjsu1wioeqGcwKIdDLObzW D2c4aRPQa8hs1xYjpHMNiVS/WGkwLtRzTFWAHZtbPKuae9/bSKPwadDOMUy89cDG64fps3PJDqoKq o75W+dujNYQB//p7cILt0TcdCnHDeJ6zETLKTSGYPH0WvH804tLt+MppmArmeu+m2+fAMuqx+NOe9 EaxhppWBjDoJrEPW+EdKZTwwqCmR3ndu/+jdV+mx/ce+TSQwwMnDOa/2W6W75mqkuEs/HhiHkXPzk jH5oqr8Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qRdno-00Aik3-1T; Thu, 03 Aug 2023 19:16:04 +0000 Received: from mail-pg1-x549.google.com ([2607:f8b0:4864:20::549]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qRdnl-00Aii4-2h for linux-riscv@lists.infradead.org; Thu, 03 Aug 2023 19:16:03 +0000 Received: by mail-pg1-x549.google.com with SMTP id 41be03b00d2f7-55c04f5827eso879849a12.1 for ; Thu, 03 Aug 2023 12:15:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20221208; t=1691090157; x=1691694957; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=1QAbc+4fCOMN1wq3LOwJ4k1bsXl9R1Q+x4bhgj3rFIg=; b=DSNF3uKlxbN1/j9sGPdV4RLbiLmTPzUp9Zu3X+X+jI/CXp8qoKO4kiLFxh0eWH4ras 3UHMbP1YaoUXHaU6RKc0xiD6OqP0/G8GaXsxhmkMXaXcobPCXbuINlBumVapPQ9eL9WI SQMF6MIyr2Twu3rQpgN63Ty4xEmvWMdFcq1qk0s/bO53R4WtT4D6mxqEq84CrHbE24tW R+R0wb7QBQEWXSd0EQn3phD4GyYVVYig+DH6wM230PxAw/bTqhOS8nPt+LaY5XqmbBEo 2lNVu9E2Fm9D/OSL8FvXxR34+QmBLtfkxeWiU2TVRkIK5+koZ6XE0PUmvWk9wsqvFkyB PpQQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691090157; x=1691694957; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=1QAbc+4fCOMN1wq3LOwJ4k1bsXl9R1Q+x4bhgj3rFIg=; b=AE2otlvTbdzd2qJpCzEkwPC3pmxCS8sa49SbMcsQzz4p5y29TtEip0bP80ATijb/K2 3EA4NP9QQ8Llp8Ph2yfFknaoxdenMdXcebaDn7pWoVa3weC8goVt07oBUwj/oNk3Nl3J tgfwuRAi5m0NUCRJMfZ7ocpWoM8nnU/RxGk94r3VGDxzSm6aM3MEGZuC9G244EqdAYif GQsdAxetxDZuNPDHvU2Ru/Q486kDmSgdyJPCICWh5z/wZQFFlDQaYOZNm9/8tQkL9sa3 B6T7Zhu4sRkil4aT/Nohq+NljCgoPlDLZa+XiAe0Tz64jSQYkKqBMeUnr1xVbYMqLUAu dpgQ== X-Gm-Message-State: ABy/qLZ+AzINHYmK0fbO3237979sY8xrEHv5RYjHGmqvhLPqDQAOdrss AKOl1V8w5RboWk9hGsu74MHc9SRzvAtn X-Google-Smtp-Source: APBJJlHtGvcJEMYqDDCqDrlA6FqIV7ZBvnc2RG3ctaXexB6pNXaY+PGUAOnc1N44cMVGOG5WgF6ZzIYHZzSS X-Received: from afranji.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:47f1]) (user=afranji job=sendgmr) by 2002:a63:295a:0:b0:563:5065:9d40 with SMTP id bu26-20020a63295a000000b0056350659d40mr129290pgb.5.1691090157410; Thu, 03 Aug 2023 12:15:57 -0700 (PDT) Date: Thu, 3 Aug 2023 19:15:54 +0000 In-Reply-To: <20230718234512.1690985-13-seanjc@google.com> Mime-Version: 1.0 References: <20230718234512.1690985-13-seanjc@google.com> X-Mailer: git-send-email 2.41.0.640.ga95def55d0-goog Message-ID: <20230803191554.205599-1-afranji@google.com> Subject: Re: [RFC PATCH v11 12/29] KVM: Add KVM_CREATE_GUEST_MEMFD ioctl() for guest-specific backing memory From: Ryan Afranji To: seanjc@google.com Cc: ackerleytng@google.com, akpm@linux-foundation.org, anup@brainfault.org, aou@eecs.berkeley.edu, chao.p.peng@linux.intel.com, chenhuacai@kernel.org, david@redhat.com, isaku.yamahata@gmail.com, jarkko@kernel.org, jmorris@namei.org, kirill.shutemov@linux.intel.com, kvm-riscv@lists.infradead.org, kvm@vger.kernel.org, kvmarm@lists.linux.dev, liam.merwick@oracle.com, linux-arm-kernel@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, linux-security-module@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, mail@maciej.szmigiero.name, maz@kernel.org, michael.roth@amd.com, mpe@ellerman.id.au, oliver.upton@linux.dev, palmer@dabbelt.com, paul.walmsley@sifive.com, paul@paul-moore.com, pbonzini@redhat.com, qperret@google.com, serge@hallyn.com, tabba@google.com, vannapurve@google.com, vbabka@suse.cz, wei.w.wang@intel.com, willy@infradead.org, yu.c.zhang@linux.intel.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230803_121601_887673_4075EE35 X-CRM114-Status: UNSURE ( 7.60 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org > +static struct folio *kvm_gmem_get_folio(struct file *file, pgoff_t index) > +{ > + struct folio *folio; > + > + /* TODO: Support huge pages. */ > + folio = filemap_grab_folio(file->f_mapping, index); > + if (!folio) > + return NULL; In Linux 6.4, filemap_grab_folio() may also return an error value. Instead of just checking for NULL, "IS_ERR_OR_NULL(folio)" will be needed. _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv