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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=141.146.126.79; envelope-from=steven.sistare@oracle.com; helo=aserp2130.oracle.com X-Spam_score_int: -46 X-Spam_score: -4.7 X-Spam_bar: ---- X-Spam_report: (-4.7 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.252, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, UNPARSEABLE_RELAY=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Daniel P. Berrange" , "Michael S. Tsirkin" , Jason Zeng , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Juan Quintela , "Dr. David Alan Gilbert" , Markus Armbruster , Alex Williamson , Steve Sistare , Stefan Hajnoczi , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , Paolo Bonzini , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Allocate anonymous memory using memfd_create if the memfd-alloc option is set. Signed-off-by: Steve Sistare --- exec.c | 38 ++++++++++++++++++++++++++++++-------- include/sysemu/sysemu.h | 1 + qemu-options.hx | 11 +++++++++++ softmmu/vl.c | 4 ++++ trace-events | 1 + 5 files changed, 47 insertions(+), 8 deletions(-) diff --git a/exec.c b/exec.c index d1f31b4..6da6590 100644 --- a/exec.c +++ b/exec.c @@ -67,6 +67,7 @@ #include "exec/log.h" =20 #include "qemu/pmem.h" +#include "qemu/memfd.h" =20 #include "migration/vmstate.h" =20 @@ -2231,34 +2232,55 @@ static void ram_block_add(RAMBlock *new_block, Erro= r **errp, bool shared) { RAMBlock *block; RAMBlock *last_block =3D NULL; + struct MemoryRegion *mr =3D new_block->mr; ram_addr_t old_ram_size, new_ram_size; Error *err =3D NULL; + const char *name; + void *addr =3D 0; + size_t maxlen; =20 old_ram_size =3D last_ram_page(); =20 qemu_mutex_lock_ramlist(); - new_block->offset =3D find_ram_offset(new_block->max_length); + maxlen =3D new_block->max_length; + new_block->offset =3D find_ram_offset(maxlen); =20 if (!new_block->host) { if (xen_enabled()) { - xen_ram_alloc(new_block->offset, new_block->max_length, - new_block->mr, &err); + xen_ram_alloc(new_block->offset, maxlen, new_block->mr, &err); if (err) { error_propagate(errp, err); qemu_mutex_unlock_ramlist(); return; } } else { - new_block->host =3D phys_mem_alloc(new_block->max_length, - &new_block->mr->align, shared= ); - if (!new_block->host) { + name =3D memory_region_name(new_block->mr); + if (memfd_alloc) { + int mfd =3D -1; /* placeholder until next patch */ + mr->align =3D QEMU_VMALLOC_ALIGN; + if (mfd < 0) { + mfd =3D qemu_memfd_create(name, maxlen + mr->align, + 0, 0, 0, &err); + if (mfd < 0) { + return; + } + } + new_block->flags |=3D RAM_SHARED; + addr =3D file_ram_alloc(new_block, maxlen, mfd, false, err= p); + trace_anon_memfd_alloc(name, maxlen, addr, mfd); + } else { + addr =3D phys_mem_alloc(maxlen, &mr->align, shared); + } + + if (!addr) { error_setg_errno(errp, errno, "cannot set up guest memory '%s'", - memory_region_name(new_block->mr)); + name); qemu_mutex_unlock_ramlist(); return; } - memory_try_enable_merging(new_block->host, new_block->max_leng= th); + memory_try_enable_merging(addr, maxlen); + new_block->host =3D addr; } } =20 diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h index 4b6a5c4..408eb56 100644 --- a/include/sysemu/sysemu.h +++ b/include/sysemu/sysemu.h @@ -13,6 +13,7 @@ extern int only_migratable; extern const char *qemu_name; extern QemuUUID qemu_uuid; extern bool qemu_uuid_set; +extern bool memfd_alloc; =20 void qemu_add_data_dir(const char *path); =20 diff --git a/qemu-options.hx b/qemu-options.hx index 708583b..455b43b7 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -4094,6 +4094,17 @@ SRST an unmigratable state. ERST =20 +#ifdef __linux__ +DEF("memfd-alloc", 0, QEMU_OPTION_memfd_alloc, \ + "-memfd-alloc allocate anonymous memory using memfd_create\n", + QEMU_ARCH_ALL) +#endif + +SRST +``-memfd-alloc`` + Allocate anonymous memory using memfd_create (Linux only). +ERST + DEF("nodefaults", 0, QEMU_OPTION_nodefaults, \ "-nodefaults don't create default devices\n", QEMU_ARCH_ALL) SRST diff --git a/softmmu/vl.c b/softmmu/vl.c index 4eb9d1f..5668e2b 100644 --- a/softmmu/vl.c +++ b/softmmu/vl.c @@ -164,6 +164,7 @@ bool boot_strict; uint8_t *boot_splash_filedata; int only_migratable; /* turn it off unless user states otherwise */ bool wakeup_suspend_enabled; +bool memfd_alloc; =20 int icount_align_option; =20 @@ -3635,6 +3636,9 @@ void qemu_init(int argc, char **argv, char **envp) case QEMU_OPTION_only_migratable: only_migratable =3D 1; break; + case QEMU_OPTION_memfd_alloc: + memfd_alloc =3D true; + break; case QEMU_OPTION_nodefaults: has_defaults =3D 0; break; diff --git a/trace-events b/trace-events index 42107eb..ed46c4d 100644 --- a/trace-events +++ b/trace-events @@ -54,6 +54,7 @@ find_ram_offset_loop(uint64_t size, uint64_t candidate, u= int64_t offset, uint64_ ram_block_discard_range(const char *rbname, void *hva, size_t length, bool= need_madvise, bool need_fallocate, int ret) "%s@%p + 0x%zx: madvise: %d fa= llocate: %d ret: %d" memory_notdirty_write_access(uint64_t vaddr, uint64_t ram_addr, unsigned s= ize) "0x%" PRIx64 " ram_addr 0x%" PRIx64 " size %u" memory_notdirty_set_dirty(uint64_t vaddr) "0x%" PRIx64 +anon_memfd_alloc(const char *name, size_t size, void *ptr, int fd) "%s siz= e %zu ptr %p fd %d" =20 # memory.c memory_region_ops_read(int cpu_index, void *mr, uint64_t addr, uint64_t va= lue, unsigned size) "cpu %d mr %p addr 0x%"PRIx64" value 0x%"PRIx64" size %= u" --=20 1.8.3.1