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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: -50 X-Spam_score: -5.1 X-Spam_bar: ----- X-Spam_report: (-5.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.699, 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" Add a function that returns true if any ram_list block represents volatile memory. Signed-off-by: Steve Sistare --- include/exec/memory.h | 8 ++++++++ softmmu/memory.c | 30 ++++++++++++++++++++++++++++++ 2 files changed, 38 insertions(+) diff --git a/include/exec/memory.h b/include/exec/memory.h index 2e5495a..d87c059 100644 --- a/include/exec/memory.h +++ b/include/exec/memory.h @@ -2646,6 +2646,14 @@ bool ram_block_discard_is_disabled(void); */ bool ram_block_discard_is_required(void); =20 +/** + * qemu_ram_volatile: return true if any memory regions are writable and n= ot + * backed by shared memory. + * + * @errp: returned error message identifying the bad region. + */ +bool qemu_ram_volatile(Error **errp); + #endif =20 #endif diff --git a/softmmu/memory.c b/softmmu/memory.c index 75d7d17..b2d5092 100644 --- a/softmmu/memory.c +++ b/softmmu/memory.c @@ -2725,6 +2725,36 @@ void memory_global_dirty_log_stop(void) memory_global_dirty_log_do_stop(); } =20 +/* + * Return true if any memory regions are writable and not backed by shared + * memory. + */ +bool qemu_ram_volatile(Error **errp) +{ + RAMBlock *block; + MemoryRegion *mr; + bool ret =3D false; + + rcu_read_lock(); + QLIST_FOREACH_RCU(block, &ram_list.blocks, next) { + mr =3D block->mr; + if (mr && + memory_region_is_ram(mr) && + !memory_region_is_ram_device(mr) && + !memory_region_is_rom(mr) && + (block->fd =3D=3D -1 || !qemu_ram_is_shared(block))) { + + error_setg(errp, "Memory region %s is volatile", + memory_region_name(mr)); + ret =3D true; + break; + } + } + + rcu_read_unlock(); + return ret; +} + static void listener_add_address_space(MemoryListener *listener, AddressSpace *as) { --=20 1.8.3.1