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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Feb 2025 10:16:25.0237 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 32794388-6786-449d-117a-08dd50ce7748 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS1PEPF00017099.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB7450 From: Shivansh Dhiman Add NUMA mempolicy support to the filemap allocation path by introducing new APIs that take a mempolicy argument: - filemap_grab_folio_mpol() - filemap_alloc_folio_mpol() - __filemap_get_folio_mpol() These APIs allow callers to specify a NUMA policy during page cache allocations, enabling fine-grained control over memory placement. This is particularly needed by KVM when using guest-memfd memory backends, where the guest memory needs to be allocated according to the NUMA policy specified by VMM. The existing non-mempolicy APIs remain unchanged and continue to use the default allocation behavior. Signed-off-by: Shivansh Dhiman Signed-off-by: Shivank Garg --- include/linux/pagemap.h | 39 +++++++++++++++++++++++++++++++++++++++ mm/filemap.c | 30 +++++++++++++++++++++++++----- 2 files changed, 64 insertions(+), 5 deletions(-) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 47bfc6b1b632..f480b3b29113 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -662,15 +662,24 @@ static inline void *detach_page_private(struct page *page) #ifdef CONFIG_NUMA struct folio *filemap_alloc_folio_noprof(gfp_t gfp, unsigned int order); +struct folio *filemap_alloc_folio_mpol_noprof(gfp_t gfp, unsigned int order, + struct mempolicy *mpol); #else static inline struct folio *filemap_alloc_folio_noprof(gfp_t gfp, unsigned int order) { return folio_alloc_noprof(gfp, order); } +static inline struct folio *filemap_alloc_folio_mpol_noprof(gfp_t gfp, + unsigned int order, struct mempolicy *mpol) +{ + return filemap_alloc_folio_noprof(gfp, order); +} #endif #define filemap_alloc_folio(...) \ alloc_hooks(filemap_alloc_folio_noprof(__VA_ARGS__)) +#define filemap_alloc_folio_mpol(...) \ + alloc_hooks(filemap_alloc_folio_mpol_noprof(__VA_ARGS__)) static inline struct page *__page_cache_alloc(gfp_t gfp) { @@ -762,6 +771,8 @@ static inline fgf_t fgf_set_order(size_t size) void *filemap_get_entry(struct address_space *mapping, pgoff_t index); struct folio *__filemap_get_folio(struct address_space *mapping, pgoff_t index, fgf_t fgp_flags, gfp_t gfp); +struct folio *__filemap_get_folio_mpol(struct address_space *mapping, + pgoff_t index, fgf_t fgp_flags, gfp_t gfp, struct mempolicy *mpol); struct page *pagecache_get_page(struct address_space *mapping, pgoff_t index, fgf_t fgp_flags, gfp_t gfp); @@ -820,6 +831,34 @@ static inline struct folio *filemap_grab_folio(struct address_space *mapping, mapping_gfp_mask(mapping)); } +/** + * filemap_grab_folio_mpol - grab a folio from the page cache. + * @mapping: The address space to search. + * @index: The page index. + * @mpol: The mempolicy to apply when allocating a new folio. + * + * Same as filemap_grab_folio(), except that it allocates the folio using + * given memory policy. + * + * Return: A found or created folio. ERR_PTR(-ENOMEM) if no folio is found + * and failed to create a folio. + */ +#ifdef CONFIG_NUMA +static inline struct folio *filemap_grab_folio_mpol(struct address_space *mapping, + pgoff_t index, struct mempolicy *mpol) +{ + return __filemap_get_folio_mpol(mapping, index, + FGP_LOCK | FGP_ACCESSED | FGP_CREAT, + mapping_gfp_mask(mapping), mpol); +} +#else +static inline struct folio *filemap_grab_folio_mpol(struct address_space *mapping, + pgoff_t index, struct mempolicy *mpol) +{ + return filemap_grab_folio(mapping, index); +} +#endif /* CONFIG_NUMA */ + /** * find_get_page - find and get a page reference * @mapping: the address_space to search diff --git a/mm/filemap.c b/mm/filemap.c index 804d7365680c..9abb20c4d705 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1001,11 +1001,17 @@ int filemap_add_folio(struct address_space *mapping, struct folio *folio, EXPORT_SYMBOL_GPL(filemap_add_folio); #ifdef CONFIG_NUMA -struct folio *filemap_alloc_folio_noprof(gfp_t gfp, unsigned int order) +struct folio *filemap_alloc_folio_mpol_noprof(gfp_t gfp, unsigned int order, + struct mempolicy *mpol) { int n; struct folio *folio; + if (mpol) + return folio_alloc_mpol_noprof(gfp, order, mpol, + NO_INTERLEAVE_INDEX, + numa_node_id()); + if (cpuset_do_page_mem_spread()) { unsigned int cpuset_mems_cookie; do { @@ -1018,6 +1024,12 @@ struct folio *filemap_alloc_folio_noprof(gfp_t gfp, unsigned int order) } return folio_alloc_noprof(gfp, order); } +EXPORT_SYMBOL(filemap_alloc_folio_mpol_noprof); + +struct folio *filemap_alloc_folio_noprof(gfp_t gfp, unsigned int order) +{ + return filemap_alloc_folio_mpol_noprof(gfp, order, NULL); +} EXPORT_SYMBOL(filemap_alloc_folio_noprof); #endif @@ -1881,11 +1893,12 @@ void *filemap_get_entry(struct address_space *mapping, pgoff_t index) } /** - * __filemap_get_folio - Find and get a reference to a folio. + * __filemap_get_folio_mpol - Find and get a reference to a folio. * @mapping: The address_space to search. * @index: The page index. * @fgp_flags: %FGP flags modify how the folio is returned. * @gfp: Memory allocation flags to use if %FGP_CREAT is specified. + * @mpol: The mempolicy to apply when allocating a new folio. * * Looks up the page cache entry at @mapping & @index. * @@ -1896,8 +1909,8 @@ void *filemap_get_entry(struct address_space *mapping, pgoff_t index) * * Return: The found folio or an ERR_PTR() otherwise. */ -struct folio *__filemap_get_folio(struct address_space *mapping, pgoff_t index, - fgf_t fgp_flags, gfp_t gfp) +struct folio *__filemap_get_folio_mpol(struct address_space *mapping, pgoff_t index, + fgf_t fgp_flags, gfp_t gfp, struct mempolicy *mpol) { struct folio *folio; @@ -1967,7 +1980,7 @@ struct folio *__filemap_get_folio(struct address_space *mapping, pgoff_t index, err = -ENOMEM; if (order > min_order) alloc_gfp |= __GFP_NORETRY | __GFP_NOWARN; - folio = filemap_alloc_folio(alloc_gfp, order); + folio = filemap_alloc_folio_mpol(alloc_gfp, order, mpol); if (!folio) continue; @@ -2003,6 +2016,13 @@ struct folio *__filemap_get_folio(struct address_space *mapping, pgoff_t index, folio_clear_dropbehind(folio); return folio; } +EXPORT_SYMBOL(__filemap_get_folio_mpol); + +struct folio *__filemap_get_folio(struct address_space *mapping, pgoff_t index, + fgf_t fgp_flags, gfp_t gfp) +{ + return __filemap_get_folio_mpol(mapping, index, fgp_flags, gfp, NULL); +} EXPORT_SYMBOL(__filemap_get_folio); static inline struct folio *find_get_entry(struct xa_state *xas, pgoff_t max, From patchwork Wed Feb 19 10:15:57 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shivank Garg X-Patchwork-Id: 13981890 Received: from NAM12-BN8-obe.outbound.protection.outlook.com (mail-bn8nam12on2043.outbound.protection.outlook.com [40.107.237.43]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9ABF92862BD; 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Wed, 19 Feb 2025 04:16:24 -0600 From: Shivank Garg To: , , CC: , , , , , , , , , , , , , , , , Subject: [RFC PATCH v5 2/4] mm/mempolicy: export memory policy symbols Date: Wed, 19 Feb 2025 10:15:57 +0000 Message-ID: <20250219101559.414878-3-shivankg@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250219101559.414878-1-shivankg@amd.com> References: <20250219101559.414878-1-shivankg@amd.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS1PEPF00017097:EE_|MN2PR12MB4392:EE_ X-MS-Office365-Filtering-Correlation-Id: 58eca7c8-cff4-4fd5-44a4-08dd50ce7ab8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|82310400026|36860700013|1800799024; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(376014)(7416014)(82310400026)(36860700013)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Feb 2025 10:16:30.7922 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 58eca7c8-cff4-4fd5-44a4-08dd50ce7ab8 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS1PEPF00017097.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4392 KVM guest_memfd wants to implement support for NUMA policies just like shmem already does using the shared policy infrastructure. As guest_memfd currently resides in KVM module code, we have to export the relevant symbols. In the future, guest_memfd might be moved to core-mm, at which point the symbols no longer would have to be exported. When/if that happens is still unclear. Acked-by: David Hildenbrand Signed-off-by: Shivank Garg --- mm/mempolicy.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/mm/mempolicy.c b/mm/mempolicy.c index bbaadbeeb291..d9c5dcdadcd0 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -214,6 +214,7 @@ struct mempolicy *get_task_policy(struct task_struct *p) return &default_policy; } +EXPORT_SYMBOL_GPL(get_task_policy); static const struct mempolicy_operations { int (*create)(struct mempolicy *pol, const nodemask_t *nodes); @@ -347,6 +348,7 @@ void __mpol_put(struct mempolicy *pol) return; kmem_cache_free(policy_cache, pol); } +EXPORT_SYMBOL_GPL(__mpol_put); static void mpol_rebind_default(struct mempolicy *pol, const nodemask_t *nodes) { @@ -2736,6 +2738,7 @@ struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp, read_unlock(&sp->lock); return pol; } +EXPORT_SYMBOL_GPL(mpol_shared_policy_lookup); static void sp_free(struct sp_node *n) { @@ -3021,6 +3024,7 @@ void mpol_shared_policy_init(struct shared_policy *sp, struct mempolicy *mpol) mpol_put(mpol); /* drop our incoming ref on sb mpol */ } } +EXPORT_SYMBOL_GPL(mpol_shared_policy_init); int mpol_set_shared_policy(struct shared_policy *sp, struct vm_area_struct *vma, struct mempolicy *pol) @@ -3039,6 +3043,7 @@ int mpol_set_shared_policy(struct shared_policy *sp, sp_free(new); return err; } +EXPORT_SYMBOL_GPL(mpol_set_shared_policy); /* Free a backing policy store on inode delete. */ void mpol_free_shared_policy(struct shared_policy *sp) @@ -3057,6 +3062,7 @@ void mpol_free_shared_policy(struct shared_policy *sp) } write_unlock(&sp->lock); } +EXPORT_SYMBOL_GPL(mpol_free_shared_policy); #ifdef CONFIG_NUMA_BALANCING static int __initdata numabalancing_override; From patchwork Wed Feb 19 10:15:58 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shivank Garg X-Patchwork-Id: 13981891 Received: from NAM12-MW2-obe.outbound.protection.outlook.com (mail-mw2nam12on2043.outbound.protection.outlook.com [40.107.244.43]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BCD4D1DED64; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Feb 2025 10:16:36.3519 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e8d5f815-cbe4-45f7-9b35-08dd50ce7e08 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS1PEPF00017099.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB5877 Pass file pointer instead of inode pointer to access struct kvm_gmem stored in file->private_data. This change is needed to access NUMA policy when allocating memory for guest_memfd, which will be added in a following patch. The following functions are modified to use file pointers: - kvm_gmem_get_folio() - kvm_gmem_allocate() Preparatory patch and no functional changes. Signed-off-by: Shivank Garg --- virt/kvm/guest_memfd.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/virt/kvm/guest_memfd.c b/virt/kvm/guest_memfd.c index b2aa6bf24d3a..f18176976ae3 100644 --- a/virt/kvm/guest_memfd.c +++ b/virt/kvm/guest_memfd.c @@ -96,10 +96,10 @@ static int kvm_gmem_prepare_folio(struct kvm *kvm, struct kvm_memory_slot *slot, * Ignore accessed, referenced, and dirty flags. The memory is * unevictable and there is no storage to write back to. */ -static struct folio *kvm_gmem_get_folio(struct inode *inode, pgoff_t index) +static struct folio *kvm_gmem_get_folio(struct file *file, pgoff_t index) { /* TODO: Support huge pages. */ - return filemap_grab_folio(inode->i_mapping, index); + return filemap_grab_folio(file_inode(file)->i_mapping, index); } static void kvm_gmem_invalidate_begin(struct kvm_gmem *gmem, pgoff_t start, @@ -177,8 +177,9 @@ static long kvm_gmem_punch_hole(struct inode *inode, loff_t offset, loff_t len) return 0; } -static long kvm_gmem_allocate(struct inode *inode, loff_t offset, loff_t len) +static long kvm_gmem_allocate(struct file *file, loff_t offset, loff_t len) { + struct inode *inode = file_inode(file); struct address_space *mapping = inode->i_mapping; pgoff_t start, index, end; int r; @@ -201,7 +202,7 @@ static long kvm_gmem_allocate(struct inode *inode, loff_t offset, loff_t len) break; } - folio = kvm_gmem_get_folio(inode, index); + folio = kvm_gmem_get_folio(file, index); if (IS_ERR(folio)) { r = PTR_ERR(folio); break; @@ -241,7 +242,7 @@ static long kvm_gmem_fallocate(struct file *file, int mode, loff_t offset, if (mode & FALLOC_FL_PUNCH_HOLE) ret = kvm_gmem_punch_hole(file_inode(file), offset, len); else - ret = kvm_gmem_allocate(file_inode(file), offset, len); + ret = kvm_gmem_allocate(file, offset, len); if (!ret) file_modified(file); @@ -585,7 +586,7 @@ static struct folio *__kvm_gmem_get_pfn(struct file *file, return ERR_PTR(-EIO); } - folio = kvm_gmem_get_folio(file_inode(file), index); + folio = kvm_gmem_get_folio(file, index); if (IS_ERR(folio)) return folio; From patchwork Wed Feb 19 10:15:59 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shivank Garg X-Patchwork-Id: 13981892 Received: from NAM10-MW2-obe.outbound.protection.outlook.com (mail-mw2nam10on2081.outbound.protection.outlook.com [40.107.94.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B7FFC1DB546; 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Wed, 19 Feb 2025 04:16:36 -0600 From: Shivank Garg To: , , CC: , , , , , , , , , , , , , , , , Subject: [RFC PATCH v5 4/4] KVM: guest_memfd: Enforce NUMA mempolicy using shared policy Date: Wed, 19 Feb 2025 10:15:59 +0000 Message-ID: <20250219101559.414878-5-shivankg@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250219101559.414878-1-shivankg@amd.com> References: <20250219101559.414878-1-shivankg@amd.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS1PEPF00017097:EE_|IA1PR12MB7591:EE_ X-MS-Office365-Filtering-Correlation-Id: 6b332aca-a3ae-4fad-f87e-08dd50ce8160 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|7416014|82310400026|376014|1800799024; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(36860700013)(7416014)(82310400026)(376014)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Feb 2025 10:16:41.9641 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6b332aca-a3ae-4fad-f87e-08dd50ce8160 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS1PEPF00017097.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB7591 Previously, guest-memfd allocations were following local NUMA node id in absence of process mempolicy, resulting in random memory allocation. Moreover, mbind() couldn't be used since memory wasn't mapped to userspace in VMM. Enable NUMA policy support by implementing vm_ops for guest-memfd mmap operation. This allows VMM to map the memory and use mbind() to set the desired NUMA policy. The policy is then retrieved via mpol_shared_policy_lookup() and passed to filemap_grab_folio_mpol() to ensure that allocations follow the specified memory policy. This enables VMM to control guest memory NUMA placement by calling mbind() on the mapped memory regions, providing fine-grained control over guest memory allocation across NUMA nodes. Suggested-by: David Hildenbrand Signed-off-by: Shivank Garg --- virt/kvm/guest_memfd.c | 76 +++++++++++++++++++++++++++++++++++++++++- 1 file changed, 75 insertions(+), 1 deletion(-) diff --git a/virt/kvm/guest_memfd.c b/virt/kvm/guest_memfd.c index f18176976ae3..8d1dfce5d3dc 100644 --- a/virt/kvm/guest_memfd.c +++ b/virt/kvm/guest_memfd.c @@ -2,6 +2,7 @@ #include #include #include +#include #include #include @@ -11,8 +12,12 @@ struct kvm_gmem { struct kvm *kvm; struct xarray bindings; struct list_head entry; + struct shared_policy policy; }; +static struct mempolicy *kvm_gmem_get_pgoff_policy(struct kvm_gmem *gmem, + pgoff_t index); + /** * folio_file_pfn - like folio_file_page, but return a pfn. * @folio: The folio which contains this index. @@ -99,7 +104,25 @@ static int kvm_gmem_prepare_folio(struct kvm *kvm, struct kvm_memory_slot *slot, static struct folio *kvm_gmem_get_folio(struct file *file, pgoff_t index) { /* TODO: Support huge pages. */ - return filemap_grab_folio(file_inode(file)->i_mapping, index); + struct kvm_gmem *gmem = file->private_data; + struct inode *inode = file_inode(file); + struct mempolicy *policy; + struct folio *folio; + + /* + * Fast-path: See if folio is already present in mapping to avoid + * policy_lookup. + */ + folio = __filemap_get_folio(inode->i_mapping, index, + FGP_LOCK | FGP_ACCESSED, 0); + if (!IS_ERR(folio)) + return folio; + + policy = kvm_gmem_get_pgoff_policy(gmem, index); + folio = filemap_grab_folio_mpol(inode->i_mapping, index, policy); + mpol_cond_put(policy); + + return folio; } static void kvm_gmem_invalidate_begin(struct kvm_gmem *gmem, pgoff_t start, @@ -291,6 +314,7 @@ static int kvm_gmem_release(struct inode *inode, struct file *file) mutex_unlock(&kvm->slots_lock); xa_destroy(&gmem->bindings); + mpol_free_shared_policy(&gmem->policy); kfree(gmem); kvm_put_kvm(kvm); @@ -312,8 +336,57 @@ static pgoff_t kvm_gmem_get_index(struct kvm_memory_slot *slot, gfn_t gfn) { return gfn - slot->base_gfn + slot->gmem.pgoff; } +#ifdef CONFIG_NUMA +static int kvm_gmem_set_policy(struct vm_area_struct *vma, struct mempolicy *new) +{ + struct file *file = vma->vm_file; + struct kvm_gmem *gmem = file->private_data; + + return mpol_set_shared_policy(&gmem->policy, vma, new); +} + +static struct mempolicy *kvm_gmem_get_policy(struct vm_area_struct *vma, + unsigned long addr, pgoff_t *pgoff) +{ + struct file *file = vma->vm_file; + struct kvm_gmem *gmem = file->private_data; + + *pgoff = vma->vm_pgoff + ((addr - vma->vm_start) >> PAGE_SHIFT); + return mpol_shared_policy_lookup(&gmem->policy, *pgoff); +} + +static struct mempolicy *kvm_gmem_get_pgoff_policy(struct kvm_gmem *gmem, + pgoff_t index) +{ + struct mempolicy *mpol; + + mpol = mpol_shared_policy_lookup(&gmem->policy, index); + return mpol ? mpol : get_task_policy(current); +} +#else +static struct mempolicy *kvm_gmem_get_pgoff_policy(struct kvm_gmem *gmem, + pgoff_t index) +{ + return NULL; +} +#endif /* CONFIG_NUMA */ + +static const struct vm_operations_struct kvm_gmem_vm_ops = { +#ifdef CONFIG_NUMA + .get_policy = kvm_gmem_get_policy, + .set_policy = kvm_gmem_set_policy, +#endif +}; + +static int kvm_gmem_mmap(struct file *file, struct vm_area_struct *vma) +{ + file_accessed(file); + vma->vm_ops = &kvm_gmem_vm_ops; + return 0; +} static struct file_operations kvm_gmem_fops = { + .mmap = kvm_gmem_mmap, .open = generic_file_open, .release = kvm_gmem_release, .fallocate = kvm_gmem_fallocate, @@ -446,6 +519,7 @@ static int __kvm_gmem_create(struct kvm *kvm, loff_t size, u64 flags) kvm_get_kvm(kvm); gmem->kvm = kvm; xa_init(&gmem->bindings); + mpol_shared_policy_init(&gmem->policy, NULL); list_add(&gmem->entry, &inode->i_mapping->i_private_list); fd_install(fd, file);