From: Ackerley Tng ackerleytng@google.com

guest_memfd's inode represents memory the guest_memfd is providing. guest_memfd's file represents a struct kvm's view of that memory.

Using a custom inode allows customization of the inode teardown process via callbacks. For example, ->evict_inode() allows customization of the truncation process on file close, and ->destroy_inode() and ->free_inode() allow customization of the inode freeing process.

Customizing the truncation process allows flexibility in management of guest_memfd memory and customization of the inode freeing process allows proper cleanup of memory metadata stored on the inode.

Memory metadata is more appropriately stored on the inode (as opposed to the file), since the metadata is for the memory and is not unique to a specific binding and struct kvm.

Co-developed-by: Fuad Tabba tabba@google.com Signed-off-by: Fuad Tabba tabba@google.com Signed-off-by: Ackerley Tng ackerleytng@google.com Signed-off-by: Shivank Garg shivankg@amd.com ---

include/uapi/linux/magic.h | 1 + virt/kvm/guest_memfd.c | 134 +++++++++++++++++++++++++++++++------ virt/kvm/kvm_main.c | 7 +- virt/kvm/kvm_mm.h | 10 ++- 4 files changed, 127 insertions(+), 25 deletions(-)

diff --git a/include/uapi/linux/magic.h b/include/uapi/linux/magic.h index bb575f3ab45e..638ca21b7a90 100644 --- a/include/uapi/linux/magic.h +++ b/include/uapi/linux/magic.h @@ -103,5 +103,6 @@ #define DEVMEM_MAGIC 0x454d444d /* "DMEM" */ #define SECRETMEM_MAGIC 0x5345434d /* "SECM" */ #define PID_FS_MAGIC 0x50494446 /* "PIDF" */ +#define GUEST_MEMFD_MAGIC 0x474d454d /* "GMEM" */

#endif /* __LINUX_MAGIC_H__ */ diff --git a/virt/kvm/guest_memfd.c b/virt/kvm/guest_memfd.c index d01bd7a2c2bd..dabcc2317291 100644 --- a/virt/kvm/guest_memfd.c +++ b/virt/kvm/guest_memfd.c @@ -1,12 +1,16 @@ // SPDX-License-Identifier: GPL-2.0 +#include <linux/anon_inodes.h> #include <linux/backing-dev.h> #include <linux/falloc.h> +#include <linux/fs.h> #include <linux/kvm_host.h> +#include <linux/pseudo_fs.h> #include <linux/pagemap.h> -#include <linux/anon_inodes.h>

#include "kvm_mm.h"

+static struct vfsmount *kvm_gmem_mnt; + struct kvm_gmem { struct kvm *kvm; struct xarray bindings; @@ -388,9 +392,51 @@ static struct file_operations kvm_gmem_fops = { .fallocate = kvm_gmem_fallocate, };

-void kvm_gmem_init(struct module *module) +static const struct super_operations kvm_gmem_super_operations = { + .statfs = simple_statfs, +}; + +static int kvm_gmem_init_fs_context(struct fs_context *fc) +{ + struct pseudo_fs_context *ctx; + + if (!init_pseudo(fc, GUEST_MEMFD_MAGIC)) + return -ENOMEM; + + ctx = fc->fs_private; + ctx->ops = &kvm_gmem_super_operations; + + return 0; +} + +static struct file_system_type kvm_gmem_fs = { + .name = "kvm_guest_memory", + .init_fs_context = kvm_gmem_init_fs_context, + .kill_sb = kill_anon_super, +}; + +static int kvm_gmem_init_mount(void) +{ + kvm_gmem_mnt = kern_mount(&kvm_gmem_fs); + + if (IS_ERR(kvm_gmem_mnt)) + return PTR_ERR(kvm_gmem_mnt); + + kvm_gmem_mnt->mnt_flags |= MNT_NOEXEC; + return 0; +} + +int kvm_gmem_init(struct module *module) { kvm_gmem_fops.owner = module; + + return kvm_gmem_init_mount(); +} + +void kvm_gmem_exit(void) +{ + kern_unmount(kvm_gmem_mnt); + kvm_gmem_mnt = NULL; }

static int kvm_gmem_migrate_folio(struct address_space *mapping, @@ -472,11 +518,71 @@ static const struct inode_operations kvm_gmem_iops = { .setattr = kvm_gmem_setattr, };

+static struct inode *kvm_gmem_inode_make_secure_inode(const char *name, + loff_t size, u64 flags) +{ + struct inode *inode; + + inode = anon_inode_make_secure_inode(kvm_gmem_mnt->mnt_sb, name, NULL); + if (IS_ERR(inode)) + return inode; + + inode->i_private = (void *)(unsigned long)flags; + inode->i_op = &kvm_gmem_iops; + inode->i_mapping->a_ops = &kvm_gmem_aops; + inode->i_mode |= S_IFREG; + inode->i_size = size; + mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER); + mapping_set_inaccessible(inode->i_mapping); + /* Unmovable mappings are supposed to be marked unevictable as well. */ + WARN_ON_ONCE(!mapping_unevictable(inode->i_mapping)); + + return inode; +} + +static struct file *kvm_gmem_inode_create_getfile(void *priv, loff_t size, + u64 flags) +{ + static const char *name = "[kvm-gmem]"; + struct inode *inode; + struct file *file; + int err; + + err = -ENOENT; + if (!try_module_get(kvm_gmem_fops.owner)) + goto err; + + inode = kvm_gmem_inode_make_secure_inode(name, size, flags); + if (IS_ERR(inode)) { + err = PTR_ERR(inode); + goto err_put_module; + } + + file = alloc_file_pseudo(inode, kvm_gmem_mnt, name, O_RDWR, + &kvm_gmem_fops); + if (IS_ERR(file)) { + err = PTR_ERR(file); + goto err_put_inode; + } + + file->f_flags |= O_LARGEFILE; + file->private_data = priv; + +out: + return file; + +err_put_inode: + iput(inode); +err_put_module: + module_put(kvm_gmem_fops.owner); +err: + file = ERR_PTR(err); + goto out; +} + static int __kvm_gmem_create(struct kvm *kvm, loff_t size, u64 flags) { - const char *anon_name = "[kvm-gmem]"; struct kvm_gmem *gmem; - struct inode *inode; struct file *file; int fd, err;

@@ -490,32 +596,16 @@ static int __kvm_gmem_create(struct kvm *kvm, loff_t size, u64 flags) goto err_fd; }

- file = anon_inode_create_getfile(anon_name, &kvm_gmem_fops, gmem, - O_RDWR, NULL); + file = kvm_gmem_inode_create_getfile(gmem, size, flags); if (IS_ERR(file)) { err = PTR_ERR(file); goto err_gmem; }

- file->f_flags |= O_LARGEFILE; - - inode = file->f_inode; - WARN_ON(file->f_mapping != inode->i_mapping); - - inode->i_private = (void *)(unsigned long)flags; - inode->i_op = &kvm_gmem_iops; - inode->i_mapping->a_ops = &kvm_gmem_aops; - inode->i_mode |= S_IFREG; - inode->i_size = size; - mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER); - mapping_set_inaccessible(inode->i_mapping); - /* Unmovable mappings are supposed to be marked unevictable as well. */ - WARN_ON_ONCE(!mapping_unevictable(inode->i_mapping)); - kvm_get_kvm(kvm); gmem->kvm = kvm; xa_init(&gmem->bindings); - list_add(&gmem->entry, &inode->i_mapping->i_private_list); + list_add(&gmem->entry, &file_inode(file)->i_mapping->i_private_list);

fd_install(fd, file); return fd; diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index f1ac872e01e9..9ccdedc9460a 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -6486,7 +6486,9 @@ int kvm_init(unsigned vcpu_size, unsigned vcpu_align, struct module *module) if (WARN_ON_ONCE(r)) goto err_vfio;

- kvm_gmem_init(module); + r = kvm_gmem_init(module); + if (r) + goto err_gmem;

r = kvm_init_virtualization(); if (r) @@ -6507,6 +6509,8 @@ int kvm_init(unsigned vcpu_size, unsigned vcpu_align, struct module *module) err_register: kvm_uninit_virtualization(); err_virt: + kvm_gmem_exit(); +err_gmem: kvm_vfio_ops_exit(); err_vfio: kvm_async_pf_deinit(); @@ -6538,6 +6542,7 @@ void kvm_exit(void) for_each_possible_cpu(cpu) free_cpumask_var(per_cpu(cpu_kick_mask, cpu)); kmem_cache_destroy(kvm_vcpu_cache); + kvm_gmem_exit(); kvm_vfio_ops_exit(); kvm_async_pf_deinit(); kvm_irqfd_exit(); diff --git a/virt/kvm/kvm_mm.h b/virt/kvm/kvm_mm.h index ec311c0d6718..089f87ed00dc 100644 --- a/virt/kvm/kvm_mm.h +++ b/virt/kvm/kvm_mm.h @@ -68,17 +68,23 @@ static inline void gfn_to_pfn_cache_invalidate_start(struct kvm *kvm, #endif /* HAVE_KVM_PFNCACHE */

#ifdef CONFIG_KVM_GMEM -void kvm_gmem_init(struct module *module); +int kvm_gmem_init(struct module *module); +void kvm_gmem_exit(void); int kvm_gmem_create(struct kvm *kvm, struct kvm_create_guest_memfd *args); int kvm_gmem_bind(struct kvm *kvm, struct kvm_memory_slot *slot, unsigned int fd, loff_t offset); void kvm_gmem_unbind(struct kvm_memory_slot *slot); #else -static inline void kvm_gmem_init(struct module *module) +static inline int kvm_gmem_init(struct module *module) {

+ return 0; }

+static inline void kvm_gmem_exit(void) {}; + +static inline void kvm_gmem_init(struct module *module) + static inline int kvm_gmem_bind(struct kvm *kvm, struct kvm_memory_slot *slot, unsigned int fd, loff_t offset)

From: "Matthew Wilcox (Oracle)" willy@infradead.org

Extend __filemap_get_folio() to support NUMA memory policies by renaming the implementation to __filemap_get_folio_mpol() and adding a mempolicy parameter. The original function becomes a static inline wrapper that passes NULL for the mempolicy.

This infrastructure will enable future support for NUMA-aware page cache allocations in guest_memfd memory backend KVM guests.

Reviewed-by: Pankaj Gupta pankaj.gupta@amd.com Reviewed-by: Vlastimil Babka vbabka@suse.cz Signed-off-by: Matthew Wilcox (Oracle) willy@infradead.org Signed-off-by: Shivank Garg shivankg@amd.com --- include/linux/pagemap.h | 10 ++++++++-- mm/filemap.c | 11 ++++++----- 2 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 78ea357d2077..981ff97b4445 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -747,11 +747,17 @@ 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 fgf_flags, gfp_t gfp, struct mempolicy *policy); struct page *pagecache_get_page(struct address_space *mapping, pgoff_t index, fgf_t fgp_flags, gfp_t gfp);

+static inline struct folio *__filemap_get_folio(struct address_space *mapping, + pgoff_t index, fgf_t fgf_flags, gfp_t gfp) +{ + return __filemap_get_folio_mpol(mapping, index, fgf_flags, gfp, NULL); +} + /** * filemap_get_folio - Find and get a folio. * @mapping: The address_space to search. diff --git a/mm/filemap.c b/mm/filemap.c index a30cd4dd085a..ec7de38c17c1 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -1896,11 +1896,12 @@ 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. + * @policy: NUMA memory allocation policy to follow. * * Looks up the page cache entry at @mapping & @index. * @@ -1911,8 +1912,8 @@ 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 *policy) { struct folio *folio;

@@ -1982,7 +1983,7 @@ 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, NULL); + folio = filemap_alloc_folio(alloc_gfp, order, policy); if (!folio) continue;

@@ -2029,7 +2030,7 @@ struct folio *__filemap_get_folio(struct address_space *mapping, pgoff_t index, folio_clear_dropbehind(folio); return folio; } -EXPORT_SYMBOL(__filemap_get_folio); +EXPORT_SYMBOL(__filemap_get_folio_mpol);

static inline struct folio *find_get_entry(struct xa_state *xas, pgoff_t max, xa_mark_t mark)

Add dedicated inode structure (kvm_gmem_inode_info) and slab-allocated inode cache for guest memory backing, similar to how shmem handles inodes.

This adds the necessary allocation/destruction functions and prepares for upcoming guest_memfd NUMA policy support changes.

Signed-off-by: Shivank Garg shivankg@amd.com --- virt/kvm/guest_memfd.c | 58 ++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 56 insertions(+), 2 deletions(-)

diff --git a/virt/kvm/guest_memfd.c b/virt/kvm/guest_memfd.c index dabcc2317291..989e2b26b344 100644 --- a/virt/kvm/guest_memfd.c +++ b/virt/kvm/guest_memfd.c @@ -17,6 +17,15 @@ struct kvm_gmem { struct list_head entry; };

+struct kvm_gmem_inode_info { + struct inode vfs_inode; +}; + +static inline struct kvm_gmem_inode_info *KVM_GMEM_I(struct inode *inode) +{ + return container_of(inode, struct kvm_gmem_inode_info, vfs_inode); +} + /** * folio_file_pfn - like folio_file_page, but return a pfn. * @folio: The folio which contains this index. @@ -392,8 +401,33 @@ static struct file_operations kvm_gmem_fops = { .fallocate = kvm_gmem_fallocate, };

+static struct kmem_cache *kvm_gmem_inode_cachep; + +static struct inode *kvm_gmem_alloc_inode(struct super_block *sb) +{ + struct kvm_gmem_inode_info *info; + + info = alloc_inode_sb(sb, kvm_gmem_inode_cachep, GFP_KERNEL); + if (!info) + return NULL; + + return &info->vfs_inode; +} + +static void kvm_gmem_destroy_inode(struct inode *inode) +{ +} + +static void kvm_gmem_free_inode(struct inode *inode) +{ + kmem_cache_free(kvm_gmem_inode_cachep, KVM_GMEM_I(inode)); +} + static const struct super_operations kvm_gmem_super_operations = { .statfs = simple_statfs, + .alloc_inode = kvm_gmem_alloc_inode, + .destroy_inode = kvm_gmem_destroy_inode, + .free_inode = kvm_gmem_free_inode, };

static int kvm_gmem_init_fs_context(struct fs_context *fc) @@ -426,17 +460,37 @@ static int kvm_gmem_init_mount(void) return 0; }

+static void kvm_gmem_init_inode(void *foo) +{ + struct kvm_gmem_inode_info *info = foo; + + inode_init_once(&info->vfs_inode); +} + int kvm_gmem_init(struct module *module) { - kvm_gmem_fops.owner = module; + int ret;

- return kvm_gmem_init_mount(); + kvm_gmem_fops.owner = module; + kvm_gmem_inode_cachep = kmem_cache_create("kvm_gmem_inode_cache", + sizeof(struct kvm_gmem_inode_info), + 0, SLAB_ACCOUNT, + kvm_gmem_init_inode); + if (!kvm_gmem_inode_cachep) + return -ENOMEM; + ret = kvm_gmem_init_mount(); + if (ret) { + kmem_cache_destroy(kvm_gmem_inode_cachep); + return ret; + } + return 0; }

void kvm_gmem_exit(void) { kern_unmount(kvm_gmem_mnt); kvm_gmem_mnt = NULL; + kmem_cache_destroy(kvm_gmem_inode_cachep); }

static int kvm_gmem_migrate_folio(struct address_space *mapping,

Add tests for NUMA memory policy binding and NUMA aware allocation in guest_memfd. This extends the existing selftests by adding proper validation for: - KVM GMEM set_policy and get_policy() vm_ops functionality using mbind() and get_mempolicy() - NUMA policy application before and after memory allocation

These tests help ensure NUMA support for guest_memfd works correctly.

Signed-off-by: Shivank Garg shivankg@amd.com --- tools/testing/selftests/kvm/Makefile.kvm | 1 + .../testing/selftests/kvm/guest_memfd_test.c | 122 +++++++++++++++++- 2 files changed, 122 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selftests/kvm/Makefile.kvm index e11ed9e59ab5..f4bb02231d6a 100644 --- a/tools/testing/selftests/kvm/Makefile.kvm +++ b/tools/testing/selftests/kvm/Makefile.kvm @@ -273,6 +273,7 @@ pgste-option = $(call try-run, echo 'int main(void) { return 0; }' | \ $(CC) -Werror -Wl$(comma)--s390-pgste -x c - -o "$$TMP",-Wl$(comma)--s390-pgste)

LDLIBS += -ldl +LDLIBS += -lnuma LDFLAGS += -pthread $(no-pie-option) $(pgste-option)

LIBKVM_C := $(filter %.c,$(LIBKVM)) diff --git a/tools/testing/selftests/kvm/guest_memfd_test.c b/tools/testing/selftests/kvm/guest_memfd_test.c index 1252e74fbb8f..d8f3beccd5a0 100644 --- a/tools/testing/selftests/kvm/guest_memfd_test.c +++ b/tools/testing/selftests/kvm/guest_memfd_test.c @@ -7,6 +7,8 @@ #include <stdlib.h> #include <string.h> #include <unistd.h> +#include <numa.h> +#include <numaif.h> #include <errno.h> #include <stdio.h> #include <fcntl.h> @@ -18,6 +20,7 @@ #include <sys/mman.h> #include <sys/types.h> #include <sys/stat.h> +#include <sys/syscall.h>

#include "kvm_util.h" #include "test_util.h" @@ -115,6 +118,122 @@ static void test_mmap_not_supported(int fd, size_t page_size, size_t total_size) TEST_ASSERT_EQ(mem, MAP_FAILED); }

+#define TEST_REQUIRE_NUMA_MULTIPLE_NODES() \ + TEST_REQUIRE(numa_available() != -1 && numa_max_node() >= 1) + +static void test_mbind(int fd, size_t page_size, size_t total_size) +{ + unsigned long nodemask = 1; /* nid: 0 */ + unsigned long maxnode = 8; + unsigned long get_nodemask; + int get_policy; + char *mem; + int ret; + + TEST_REQUIRE_NUMA_MULTIPLE_NODES(); + + mem = mmap(NULL, total_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); + TEST_ASSERT(mem != MAP_FAILED, "mmap for mbind test should succeed"); + + /* Test MPOL_INTERLEAVE policy */ + ret = syscall(__NR_mbind, mem, page_size * 2, MPOL_INTERLEAVE, + &nodemask, maxnode, 0); + TEST_ASSERT(!ret, "mbind with INTERLEAVE to node 0 should succeed"); + ret = syscall(__NR_get_mempolicy, &get_policy, &get_nodemask, + maxnode, mem, MPOL_F_ADDR); + TEST_ASSERT(!ret && get_policy == MPOL_INTERLEAVE && get_nodemask == nodemask, + "Policy should be MPOL_INTERLEAVE and nodes match"); + + /* Test basic MPOL_BIND policy */ + ret = syscall(__NR_mbind, mem + page_size * 2, page_size * 2, MPOL_BIND, + &nodemask, maxnode, 0); + TEST_ASSERT(!ret, "mbind with MPOL_BIND to node 0 should succeed"); + ret = syscall(__NR_get_mempolicy, &get_policy, &get_nodemask, + maxnode, mem + page_size * 2, MPOL_F_ADDR); + TEST_ASSERT(!ret && get_policy == MPOL_BIND && get_nodemask == nodemask, + "Policy should be MPOL_BIND and nodes match"); + + /* Test MPOL_DEFAULT policy */ + ret = syscall(__NR_mbind, mem, total_size, MPOL_DEFAULT, NULL, 0, 0); + TEST_ASSERT(!ret, "mbind with MPOL_DEFAULT should succeed"); + ret = syscall(__NR_get_mempolicy, &get_policy, &get_nodemask, + maxnode, mem, MPOL_F_ADDR); + TEST_ASSERT(!ret && get_policy == MPOL_DEFAULT && get_nodemask == 0, + "Policy should be MPOL_DEFAULT and nodes zero"); + + /* Test with invalid policy */ + ret = syscall(__NR_mbind, mem, page_size, 999, &nodemask, maxnode, 0); + TEST_ASSERT(ret == -1 && errno == EINVAL, + "mbind with invalid policy should fail with EINVAL"); + + TEST_ASSERT(munmap(mem, total_size) == 0, "munmap should succeed"); +} + +static void test_numa_allocation(int fd, size_t page_size, size_t total_size) +{ + unsigned long node0_mask = 1; /* Node 0 */ + unsigned long node1_mask = 2; /* Node 1 */ + unsigned long maxnode = 8; + void *pages[4]; + int status[4]; + char *mem; + int ret, i; + + TEST_REQUIRE_NUMA_MULTIPLE_NODES(); + + /* Clean slate: deallocate all file space, if any */ + ret = fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 0, total_size); + TEST_ASSERT(!ret, "fallocate(PUNCH_HOLE) should succeed"); + + mem = mmap(NULL, total_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); + TEST_ASSERT(mem != MAP_FAILED, "mmap should succeed"); + + for (i = 0; i < 4; i++) + pages[i] = (char *)mem + page_size * i; + + /* Set NUMA policy after allocation */ + memset(mem, 0xaa, page_size); + ret = syscall(__NR_mbind, pages[0], page_size, MPOL_BIND, &node0_mask, maxnode, 0); + TEST_ASSERT(!ret, "mbind after allocation page 0 to node 0 should succeed"); + ret = fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 0, page_size); + TEST_ASSERT(!ret, "fallocate(PUNCH_HOLE) should succeed"); + + /* Set NUMA policy before allocation */ + ret = syscall(__NR_mbind, pages[0], page_size * 2, MPOL_BIND, &node1_mask, maxnode, 0); + TEST_ASSERT(!ret, "mbind page 0, 1 to node 1 should succeed"); + ret = syscall(__NR_mbind, pages[2], page_size * 2, MPOL_BIND, &node0_mask, maxnode, 0); + TEST_ASSERT(!ret, "mbind page 2, 3 to node 0 should succeed"); + memset(mem, 0xaa, total_size); + + /* Validate if pages are allocated on specified NUMA nodes */ + ret = syscall(__NR_move_pages, 0, 4, pages, NULL, status, 0); + TEST_ASSERT(ret >= 0, "move_pages should succeed for status check"); + TEST_ASSERT(status[0] == 1, "Page 0 should be allocated on node 1"); + TEST_ASSERT(status[1] == 1, "Page 1 should be allocated on node 1"); + TEST_ASSERT(status[2] == 0, "Page 2 should be allocated on node 0"); + TEST_ASSERT(status[3] == 0, "Page 3 should be allocated on node 0"); + + /* Punch hole for all pages */ + ret = fallocate(fd, FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE, 0, total_size); + TEST_ASSERT(!ret, "fallocate(PUNCH_HOLE) should succeed"); + + /* Change NUMA policy nodes and reallocate */ + ret = syscall(__NR_mbind, pages[0], page_size * 2, MPOL_BIND, &node0_mask, maxnode, 0); + TEST_ASSERT(!ret, "mbind page 0, 1 to node 0 should succeed"); + ret = syscall(__NR_mbind, pages[2], page_size * 2, MPOL_BIND, &node1_mask, maxnode, 0); + TEST_ASSERT(!ret, "mbind page 2, 3 to node 1 should succeed"); + memset(mem, 0xaa, total_size); + + ret = syscall(__NR_move_pages, 0, 4, pages, NULL, status, 0); + TEST_ASSERT(ret >= 0, "move_pages should succeed after reallocation"); + TEST_ASSERT(status[0] == 0, "Page 0 should be allocated on node 0"); + TEST_ASSERT(status[1] == 0, "Page 1 should be allocated on node 0"); + TEST_ASSERT(status[2] == 1, "Page 2 should be allocated on node 1"); + TEST_ASSERT(status[3] == 1, "Page 3 should be allocated on node 1"); + + TEST_ASSERT(munmap(mem, total_size) == 0, "munmap should succeed"); +} + static void test_file_size(int fd, size_t page_size, size_t total_size) { struct stat sb; @@ -275,7 +394,8 @@ static void test_with_type(unsigned long vm_type, uint64_t guest_memfd_flags, if (expect_mmap_allowed) { test_mmap_supported(fd, page_size, total_size); test_fault_overflow(fd, page_size, total_size); - + test_mbind(fd, page_size, total_size); + test_numa_allocation(fd, page_size, total_size); } else { test_mmap_not_supported(fd, page_size, total_size); }