From patchwork Fri Nov 22 17:29:38 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Elliot Berman X-Patchwork-Id: 13883465 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 401EAE69185 for ; Fri, 22 Nov 2024 17:33:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:CC:To:In-Reply-To:References :Message-ID:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=GXPowcRP4Bg6WzT+NowJnOvxFTLXFNUxQvqej0elrzM=; b=aTHMVsxTXyIPclHeY8PuOZ9rsw tQB7JhAESiMuvj1SL573KKAZ9yRmL92aH3FByxxhCScGWNo24IlTwTh2edZnldqEKfXxslqOJLBJD HVhkozdeikeN60Imp6soT9gfN4x8PJQma7tcfmnwQYYcxnPux5ydy3Jm6c0Ci0bFPW8FsaObbqBxL r8IRaI4LZgB39eH6JWqQTqkfN0qsmPpK+umCBzVYtXzjUB1sdu/WSkE0PIf86Si2K/pI1+XRVrhTG 3pijGJ2ZV5PujCDNDaMqVuipTkTznolFajp6dH47hL9U+p+/kkBzq4x/FKBYPhyRY77I0wUPbzjc4 o5tlQR+w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tEXWb-00000002zPN-0B0o; Fri, 22 Nov 2024 17:32:57 +0000 Received: from mx0b-0031df01.pphosted.com ([205.220.180.131]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tEXTm-00000002yfV-3GlQ for linux-arm-kernel@lists.infradead.org; Fri, 22 Nov 2024 17:30:04 +0000 Received: from pps.filterd (m0279873.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 4AMASKBk026052; Fri, 22 Nov 2024 17:29:44 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= GXPowcRP4Bg6WzT+NowJnOvxFTLXFNUxQvqej0elrzM=; b=JggJS9i608IG18bJ HGCnPpKjvDQBpwOft1wqEEMXXYmYDZxYI6+UDj40dXoKpDtw6zWNxHEnuMSdKJU3 V4VBpQ9eQaq/63xKNINkOJmElVMSvPAaIQzCFeZdcURwXiZ9NYVunCMP1M4CQF5f qB75Rw7mg6BotaWO4hKcGbUtT0ceiMUw/47alofr9jj4vqwiouz3166mZbXR2L6V MXaYz/TAqigotyh/f15iZ6wwOtMBEv7obrWLeU5kFlhQ/ro/smvJNIYe8lN6Ug68 DWsEcibjPBObrvDp0w3lbglNr8meUu5mKxkqYdCHGzUMo3905cmE00/ufEYV3E0p Z+Wy5g== Received: from nasanppmta04.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 431sv2nwj6-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 22 Nov 2024 17:29:44 +0000 (GMT) Received: from nasanex01b.na.qualcomm.com (nasanex01b.na.qualcomm.com [10.46.141.250]) by NASANPPMTA04.qualcomm.com (8.18.1.2/8.18.1.2) with ESMTPS id 4AMHThgw021012 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 22 Nov 2024 17:29:43 GMT Received: from hu-eberman-lv.qualcomm.com (10.49.16.6) by nasanex01b.na.qualcomm.com (10.46.141.250) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Fri, 22 Nov 2024 09:29:42 -0800 From: Elliot Berman Date: Fri, 22 Nov 2024 09:29:38 -0800 Subject: [PATCH v5 1/2] filemap: Pass address_space mapping to ->free_folio() MIME-Version: 1.0 Message-ID: <20241122-guestmem-library-v5-1-450e92951a15@quicinc.com> References: <20241122-guestmem-library-v5-0-450e92951a15@quicinc.com> In-Reply-To: <20241122-guestmem-library-v5-0-450e92951a15@quicinc.com> To: Paolo Bonzini , Andrew Morton , Sean Christopherson , "Fuad Tabba" , Ackerley Tng , "Mike Rapoport" , David Hildenbrand , "H. Peter Anvin" , "Matthew Wilcox (Oracle)" , Jonathan Corbet , Trond Myklebust , "Anna Schumaker" , Mike Marshall , "Martin Brandenburg" , Alexander Viro , Christian Brauner , Jan Kara CC: James Gowans , Mike Day , , , , , , , , , , , "Elliot Berman" X-Mailer: b4 0.14.2 X-Originating-IP: [10.49.16.6] X-ClientProxiedBy: nalasex01b.na.qualcomm.com (10.47.209.197) To nasanex01b.na.qualcomm.com (10.46.141.250) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: uWzzKO0FgFKSqqa1gBxggQHzCoqZ7d16 X-Proofpoint-ORIG-GUID: uWzzKO0FgFKSqqa1gBxggQHzCoqZ7d16 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 lowpriorityscore=0 clxscore=1015 bulkscore=0 adultscore=0 suspectscore=0 spamscore=0 malwarescore=0 mlxscore=0 mlxlogscore=999 phishscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2411220147 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241122_093002_944682_5C7D83F1 X-CRM114-Status: GOOD ( 18.19 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org When guest_memfd becomes a library, a callback will need to be made to the owner (KVM SEV) to update the RMP entry for the page back to shared state. This is currently being done as part of .free_folio() operation, but this callback shouldn't assume that folio->mapping is set/valid. The mapping is well-known to callers of .free_folio(), so pass that mapping so the callback can access the mapping's private data. Link: https://lore.kernel.org/all/15f665b4-2d33-41ca-ac50-fafe24ade32f@redhat.com/ Suggested-by: David Hildenbrand Acked-by: David Hildenbrand Signed-off-by: Elliot Berman --- Documentation/filesystems/locking.rst | 2 +- fs/nfs/dir.c | 11 ++++++----- fs/orangefs/inode.c | 3 ++- include/linux/fs.h | 2 +- mm/filemap.c | 9 +++++---- mm/secretmem.c | 3 ++- mm/vmscan.c | 4 ++-- virt/kvm/guest_memfd.c | 3 ++- 8 files changed, 21 insertions(+), 16 deletions(-) diff --git a/Documentation/filesystems/locking.rst b/Documentation/filesystems/locking.rst index f5e3676db954b5bce4c23a0bf723a79d66181fcd..f1a20ad5edbee70c1a3c8d8a9bfc0f008a68985b 100644 --- a/Documentation/filesystems/locking.rst +++ b/Documentation/filesystems/locking.rst @@ -258,7 +258,7 @@ prototypes:: sector_t (*bmap)(struct address_space *, sector_t); void (*invalidate_folio) (struct folio *, size_t start, size_t len); bool (*release_folio)(struct folio *, gfp_t); - void (*free_folio)(struct folio *); + void (*free_folio)(struct address_space *, struct folio *); int (*direct_IO)(struct kiocb *, struct iov_iter *iter); int (*migrate_folio)(struct address_space *, struct folio *dst, struct folio *src, enum migrate_mode); diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index 492cffd9d3d845723b5f3d0eea3874b1f1773fe1..54e7069013ef2a63db24491fa65059e5ad68057a 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -55,7 +55,7 @@ static int nfs_closedir(struct inode *, struct file *); static int nfs_readdir(struct file *, struct dir_context *); static int nfs_fsync_dir(struct file *, loff_t, loff_t, int); static loff_t nfs_llseek_dir(struct file *, loff_t, int); -static void nfs_readdir_clear_array(struct folio *); +static void nfs_readdir_clear_array(struct address_space *, struct folio *); static int nfs_do_create(struct inode *dir, struct dentry *dentry, umode_t mode, int open_flags); @@ -218,7 +218,8 @@ static void nfs_readdir_folio_init_array(struct folio *folio, u64 last_cookie, /* * we are freeing strings created by nfs_add_to_readdir_array() */ -static void nfs_readdir_clear_array(struct folio *folio) +static void nfs_readdir_clear_array(struct address_space *mapping, + struct folio *folio) { struct nfs_cache_array *array; unsigned int i; @@ -233,7 +234,7 @@ static void nfs_readdir_clear_array(struct folio *folio) static void nfs_readdir_folio_reinit_array(struct folio *folio, u64 last_cookie, u64 change_attr) { - nfs_readdir_clear_array(folio); + nfs_readdir_clear_array(folio->mapping, folio); nfs_readdir_folio_init_array(folio, last_cookie, change_attr); } @@ -249,7 +250,7 @@ nfs_readdir_folio_array_alloc(u64 last_cookie, gfp_t gfp_flags) static void nfs_readdir_folio_array_free(struct folio *folio) { if (folio) { - nfs_readdir_clear_array(folio); + nfs_readdir_clear_array(folio->mapping, folio); folio_put(folio); } } @@ -391,7 +392,7 @@ static void nfs_readdir_folio_init_and_validate(struct folio *folio, u64 cookie, if (folio_test_uptodate(folio)) { if (nfs_readdir_folio_validate(folio, cookie, change_attr)) return; - nfs_readdir_clear_array(folio); + nfs_readdir_clear_array(folio->mapping, folio); } nfs_readdir_folio_init_array(folio, cookie, change_attr); folio_mark_uptodate(folio); diff --git a/fs/orangefs/inode.c b/fs/orangefs/inode.c index aae6d2b8767df04714647db5fe1e5ce54c092fce..2d554102ba9ac83acd2b637d4568090717e87f94 100644 --- a/fs/orangefs/inode.c +++ b/fs/orangefs/inode.c @@ -470,7 +470,8 @@ static bool orangefs_release_folio(struct folio *folio, gfp_t foo) return !folio_test_private(folio); } -static void orangefs_free_folio(struct folio *folio) +static void orangefs_free_folio(struct address_space *mapping, + struct folio *folio) { kfree(folio_detach_private(folio)); } diff --git a/include/linux/fs.h b/include/linux/fs.h index e3c603d01337650d562405500013f5c4cfed8eb6..6e5b5cc99750a685b217cb8273c38e7f6bf5ae86 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -417,7 +417,7 @@ struct address_space_operations { sector_t (*bmap)(struct address_space *, sector_t); void (*invalidate_folio) (struct folio *, size_t offset, size_t len); bool (*release_folio)(struct folio *, gfp_t); - void (*free_folio)(struct folio *folio); + void (*free_folio)(struct address_space *, struct folio *folio); ssize_t (*direct_IO)(struct kiocb *, struct iov_iter *iter); /* * migrate the contents of a folio to the specified target. If diff --git a/mm/filemap.c b/mm/filemap.c index 36d22968be9a1e10da42927dd627d3f22c3a747b..2c8d92dd9d5dd433acbf1b87156eb2e68337332d 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -235,12 +235,12 @@ void __filemap_remove_folio(struct folio *folio, void *shadow) void filemap_free_folio(struct address_space *mapping, struct folio *folio) { - void (*free_folio)(struct folio *); + void (*free_folio)(struct address_space *, struct folio *); int refs = 1; free_folio = mapping->a_ops->free_folio; if (free_folio) - free_folio(folio); + free_folio(mapping, folio); if (folio_test_large(folio)) refs = folio_nr_pages(folio); @@ -814,7 +814,8 @@ EXPORT_SYMBOL(file_write_and_wait_range); void replace_page_cache_folio(struct folio *old, struct folio *new) { struct address_space *mapping = old->mapping; - void (*free_folio)(struct folio *) = mapping->a_ops->free_folio; + void (*free_folio)(struct address_space *, struct folio *) = + mapping->a_ops->free_folio; pgoff_t offset = old->index; XA_STATE(xas, &mapping->i_pages, offset); @@ -843,7 +844,7 @@ void replace_page_cache_folio(struct folio *old, struct folio *new) __lruvec_stat_add_folio(new, NR_SHMEM); xas_unlock_irq(&xas); if (free_folio) - free_folio(old); + free_folio(mapping, old); folio_put(old); } EXPORT_SYMBOL_GPL(replace_page_cache_folio); diff --git a/mm/secretmem.c b/mm/secretmem.c index 3afb5ad701e14ad87b6e5173b2974f1309399b8e..8643d073b8f3554a18d419353fa604864de224c1 100644 --- a/mm/secretmem.c +++ b/mm/secretmem.c @@ -152,7 +152,8 @@ static int secretmem_migrate_folio(struct address_space *mapping, return -EBUSY; } -static void secretmem_free_folio(struct folio *folio) +static void secretmem_free_folio(struct address_space *mapping, + struct folio *folio) { set_direct_map_default_noflush(&folio->page); folio_zero_segment(folio, 0, folio_size(folio)); diff --git a/mm/vmscan.c b/mm/vmscan.c index 749cdc110c745944cd455ae9c5a4c373f631341d..419dc63de05095be298fee724891f0665a397a7b 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -765,7 +765,7 @@ static int __remove_mapping(struct address_space *mapping, struct folio *folio, xa_unlock_irq(&mapping->i_pages); put_swap_folio(folio, swap); } else { - void (*free_folio)(struct folio *); + void (*free_folio)(struct address_space *, struct folio *); free_folio = mapping->a_ops->free_folio; /* @@ -794,7 +794,7 @@ static int __remove_mapping(struct address_space *mapping, struct folio *folio, spin_unlock(&mapping->host->i_lock); if (free_folio) - free_folio(folio); + free_folio(mapping, folio); } return 1; diff --git a/virt/kvm/guest_memfd.c b/virt/kvm/guest_memfd.c index 47a9f68f7b247f4cba0c958b4c7cd9458e7c46b4..24dcbad0cb76e353509cf4718837a1999f093414 100644 --- a/virt/kvm/guest_memfd.c +++ b/virt/kvm/guest_memfd.c @@ -358,7 +358,8 @@ static int kvm_gmem_error_folio(struct address_space *mapping, struct folio *fol } #ifdef CONFIG_HAVE_KVM_ARCH_GMEM_INVALIDATE -static void kvm_gmem_free_folio(struct folio *folio) +static void kvm_gmem_free_folio(struct address_space *mapping, + struct folio *folio) { struct page *page = folio_page(folio, 0); kvm_pfn_t pfn = page_to_pfn(page);