From nobody Mon Feb 9 23:40:17 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1517491844756332.1742441963329; Thu, 1 Feb 2018 05:30:44 -0800 (PST) Received: from localhost ([::1]:36585 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ehEwo-0006IB-D1 for importer@patchew.org; Thu, 01 Feb 2018 08:30:38 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:59598) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ehEup-0004mR-3L for qemu-devel@nongnu.org; Thu, 01 Feb 2018 08:28:39 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ehEuj-0000Eb-4q for qemu-devel@nongnu.org; Thu, 01 Feb 2018 08:28:35 -0500 Received: from mx1.redhat.com ([209.132.183.28]:59102) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ehEui-0000Da-SW for qemu-devel@nongnu.org; Thu, 01 Feb 2018 08:28:29 -0500 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 3107849023 for ; Thu, 1 Feb 2018 13:28:28 +0000 (UTC) Received: from localhost (ovpn-112-22.ams2.redhat.com [10.36.112.22]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8C1C35E1BE; Thu, 1 Feb 2018 13:28:21 +0000 (UTC) From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= To: qemu-devel@nongnu.org Date: Thu, 1 Feb 2018 14:27:52 +0100 Message-Id: <20180201132757.23063-3-marcandre.lureau@redhat.com> In-Reply-To: <20180201132757.23063-1-marcandre.lureau@redhat.com> References: <20180201132757.23063-1-marcandre.lureau@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Thu, 01 Feb 2018 13:28:28 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v7 2/7] memfd: add hugetlb support X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: pbonzini@redhat.com, ehabkost@redhat.com, =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Type: text/plain; charset="utf-8" Linux commit 749df87bd7bee5a79cef073f5d032ddb2b211de8 (v4.14-rc1) added a new flag MFD_HUGETLB to memfd_create() that specify the file to be created resides in the hugetlbfs filesystem. This is the generic hugetlbfs filesystem not associated with any specific mount point. hugetlbfs does not support sealing operations in v4.14, therefore specifying MFD_ALLOW_SEALING with MFD_HUGETLB will result in EINVAL. However, I added sealing support in "[PATCH v3 0/9] memfd: add sealing to hugetlb-backed memory" series, queued in -mm tree for v4.16. Signed-off-by: Marc-Andr=C3=A9 Lureau --- include/qemu/memfd.h | 4 ++-- util/memfd.c | 13 ++++++++++--- 2 files changed, 12 insertions(+), 5 deletions(-) diff --git a/include/qemu/memfd.h b/include/qemu/memfd.h index b9d09873b5..1d3ecc7458 100644 --- a/include/qemu/memfd.h +++ b/include/qemu/memfd.h @@ -16,8 +16,8 @@ #define F_SEAL_WRITE 0x0008 /* prevent writes */ #endif =20 -int qemu_memfd_create(const char *name, size_t size, unsigned int seals, - Error **errp); +int qemu_memfd_create(const char *name, size_t size, bool hugetlb, + unsigned int seals, Error **errp); void *qemu_memfd_alloc(const char *name, size_t size, unsigned int seals, int *fd, Error **errp); void qemu_memfd_free(void *ptr, size_t size, int fd); diff --git a/util/memfd.c b/util/memfd.c index 8d27307137..7594af7089 100644 --- a/util/memfd.c +++ b/util/memfd.c @@ -52,7 +52,11 @@ static int memfd_create(const char *name, unsigned int f= lags) #define MFD_ALLOW_SEALING 0x0002U #endif =20 -int qemu_memfd_create(const char *name, size_t size, +#ifndef MFD_HUGETLB +#define MFD_HUGETLB 0x0004U +#endif + +int qemu_memfd_create(const char *name, size_t size, bool hugetlb, unsigned int seals, Error **errp) { #ifdef CONFIG_LINUX @@ -62,6 +66,9 @@ int qemu_memfd_create(const char *name, size_t size, if (seals) { flags |=3D MFD_ALLOW_SEALING; } + if (hugetlb) { + flags |=3D MFD_HUGETLB; + } =20 mfd =3D memfd_create(name, flags); if (mfd < 0) { @@ -97,11 +104,11 @@ void *qemu_memfd_alloc(const char *name, size_t size, = unsigned int seals, int *fd, Error **errp) { void *ptr; - int mfd =3D qemu_memfd_create(name, size, seals, NULL); + int mfd =3D qemu_memfd_create(name, size, false, seals, NULL); =20 /* some systems have memfd without sealing */ if (mfd =3D=3D -1) { - mfd =3D qemu_memfd_create(name, size, 0, NULL); + mfd =3D qemu_memfd_create(name, size, false, 0, NULL); } =20 if (mfd =3D=3D -1) { --=20 2.16.0.rc1.1.gef27df75a1