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-rw-r--r--include/exec/cpu-common.h15
-rw-r--r--include/exec/memory.h27
-rw-r--r--include/gdbstub/syscalls.h9
-rw-r--r--include/hw/boards.h14
-rw-r--r--include/hw/mem/memory-device.h57
-rw-r--r--include/hw/virtio/vhost-backend.h9
-rw-r--r--include/hw/virtio/vhost.h3
-rw-r--r--include/hw/virtio/virtio-mem.h32
-rw-r--r--include/sysemu/cpus.h7
-rw-r--r--include/sysemu/kvm.h4
-rw-r--r--include/sysemu/kvm_int.h1
-rw-r--r--include/sysemu/runstate.h2
-rw-r--r--include/sysemu/sysemu.h2
13 files changed, 160 insertions, 22 deletions
diff --git a/include/exec/cpu-common.h b/include/exec/cpu-common.h
index 605b160a7e..30c376a4de 100644
--- a/include/exec/cpu-common.h
+++ b/include/exec/cpu-common.h
@@ -83,6 +83,21 @@ void qemu_ram_remap(ram_addr_t addr, ram_addr_t length);
 ram_addr_t qemu_ram_addr_from_host(void *ptr);
 ram_addr_t qemu_ram_addr_from_host_nofail(void *ptr);
 RAMBlock *qemu_ram_block_by_name(const char *name);
+
+/*
+ * Translates a host ptr back to a RAMBlock and an offset in that RAMBlock.
+ *
+ * @ptr: The host pointer to translate.
+ * @round_offset: Whether to round the result offset down to a target page
+ * @offset: Will be set to the offset within the returned RAMBlock.
+ *
+ * Returns: RAMBlock (or NULL if not found)
+ *
+ * By the time this function returns, the returned pointer is not protected
+ * by RCU anymore.  If the caller is not within an RCU critical section and
+ * does not hold the iothread lock, it must have other means of protecting the
+ * pointer, such as a reference to the memory region that owns the RAMBlock.
+ */
 RAMBlock *qemu_ram_block_from_host(void *ptr, bool round_offset,
                                    ram_addr_t *offset);
 ram_addr_t qemu_ram_block_host_offset(RAMBlock *rb, void *host);
diff --git a/include/exec/memory.h b/include/exec/memory.h
index c99842d2fc..653a32ea10 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -95,6 +95,7 @@ struct ReservedRegion {
  *     relative to the region's address space
  * @readonly: writes to this section are ignored
  * @nonvolatile: this section is non-volatile
+ * @unmergeable: this section should not get merged with adjacent sections
  */
 struct MemoryRegionSection {
     Int128 size;
@@ -104,6 +105,7 @@ struct MemoryRegionSection {
     hwaddr offset_within_address_space;
     bool readonly;
     bool nonvolatile;
+    bool unmergeable;
 };
 
 typedef struct IOMMUTLBEntry IOMMUTLBEntry;
@@ -599,8 +601,9 @@ typedef void (*ReplayRamDiscard)(MemoryRegionSection *section, void *opaque);
  * populated (consuming memory), to be used/accessed by the VM.
  *
  * A #RamDiscardManager can only be set for a RAM #MemoryRegion while the
- * #MemoryRegion isn't mapped yet; it cannot change while the #MemoryRegion is
- * mapped.
+ * #MemoryRegion isn't mapped into an address space yet (either directly
+ * or via an alias); it cannot change while the #MemoryRegion is
+ * mapped into an address space.
  *
  * The #RamDiscardManager is intended to be used by technologies that are
  * incompatible with discarding of RAM (e.g., VFIO, which may pin all
@@ -772,6 +775,7 @@ struct MemoryRegion {
     bool nonvolatile;
     bool rom_device;
     bool flush_coalesced_mmio;
+    bool unmergeable;
     uint8_t dirty_log_mask;
     bool is_iommu;
     RAMBlock *ram_block;
@@ -2350,6 +2354,25 @@ void memory_region_set_size(MemoryRegion *mr, uint64_t size);
 void memory_region_set_alias_offset(MemoryRegion *mr,
                                     hwaddr offset);
 
+/*
+ * memory_region_set_unmergeable: Set a memory region unmergeable
+ *
+ * Mark a memory region unmergeable, resulting in the memory region (or
+ * everything contained in a memory region container) not getting merged when
+ * simplifying the address space and notifying memory listeners. Consequently,
+ * memory listeners will never get notified about ranges that are larger than
+ * the original memory regions.
+ *
+ * This is primarily useful when multiple aliases to a RAM memory region are
+ * mapped into a memory region container, and updates (e.g., enable/disable or
+ * map/unmap) of individual memory region aliases are not supposed to affect
+ * other memory regions in the same container.
+ *
+ * @mr: the #MemoryRegion to be updated
+ * @unmergeable: whether to mark the #MemoryRegion unmergeable
+ */
+void memory_region_set_unmergeable(MemoryRegion *mr, bool unmergeable);
+
 /**
  * memory_region_present: checks if an address relative to a @container
  * translates into #MemoryRegion within @container
diff --git a/include/gdbstub/syscalls.h b/include/gdbstub/syscalls.h
index 243eaf8ce4..54ff7245a1 100644
--- a/include/gdbstub/syscalls.h
+++ b/include/gdbstub/syscalls.h
@@ -110,4 +110,13 @@ int use_gdb_syscalls(void);
  */
 void gdb_exit(int code);
 
+/**
+ * gdb_qemu_exit: ask qemu to exit
+ * @code: exit code reported
+ *
+ * This requests qemu to exit. This function is allowed to return as
+ * the exit request might be processed asynchronously by qemu backend.
+ */
+void gdb_qemu_exit(int code);
+
 #endif /* _SYSCALLS_H_ */
diff --git a/include/hw/boards.h b/include/hw/boards.h
index 55a64a13fd..43a56dc51e 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -297,15 +297,27 @@ struct MachineClass {
  * DeviceMemoryState:
  * @base: address in guest physical address space where the memory
  * address space for memory devices starts
- * @mr: address space container for memory devices
+ * @mr: memory region container for memory devices
+ * @as: address space for memory devices
+ * @listener: memory listener used to track used memslots in the address space
  * @dimm_size: the sum of plugged DIMMs' sizes
  * @used_region_size: the part of @mr already used by memory devices
+ * @required_memslots: the number of memslots required by memory devices
+ * @used_memslots: the number of memslots currently used by memory devices
+ * @memslot_auto_decision_active: whether any plugged memory device
+ *                                automatically decided to use more than
+ *                                one memslot
  */
 typedef struct DeviceMemoryState {
     hwaddr base;
     MemoryRegion mr;
+    AddressSpace as;
+    MemoryListener listener;
     uint64_t dimm_size;
     uint64_t used_region_size;
+    unsigned int required_memslots;
+    unsigned int used_memslots;
+    unsigned int memslot_auto_decision_active;
 } DeviceMemoryState;
 
 /**
diff --git a/include/hw/mem/memory-device.h b/include/hw/mem/memory-device.h
index 48d2611fc5..3354d6c166 100644
--- a/include/hw/mem/memory-device.h
+++ b/include/hw/mem/memory-device.h
@@ -14,6 +14,7 @@
 #define MEMORY_DEVICE_H
 
 #include "hw/qdev-core.h"
+#include "qemu/typedefs.h"
 #include "qapi/qapi-types-machine.h"
 #include "qom/object.h"
 
@@ -41,6 +42,17 @@ typedef struct MemoryDeviceState MemoryDeviceState;
  * successive memory regions are used, a covering memory region has to
  * be provided. Scattered memory regions are not supported for single
  * devices.
+ *
+ * The device memory region returned via @get_memory_region may either be a
+ * single RAM memory region or a memory region container with subregions
+ * that are RAM memory regions or aliases to RAM memory regions. Other
+ * memory regions or subregions are not supported.
+ *
+ * If the device memory region returned via @get_memory_region is a
+ * memory region container, it's supported to dynamically (un)map subregions
+ * as long as the number of memslots returned by @get_memslots() won't
+ * be exceeded and as long as all memory regions are of the same kind (e.g.,
+ * all RAM or all ROM).
  */
 struct MemoryDeviceClass {
     /* private */
@@ -89,6 +101,28 @@ struct MemoryDeviceClass {
     MemoryRegion *(*get_memory_region)(MemoryDeviceState *md, Error **errp);
 
     /*
+     * Optional: Instruct the memory device to decide how many memory slots
+     * it requires, not exceeding the given limit.
+     *
+     * Called exactly once when pre-plugging the memory device, before
+     * querying the number of memslots using @get_memslots the first time.
+     */
+    void (*decide_memslots)(MemoryDeviceState *md, unsigned int limit);
+
+    /*
+     * Optional for memory devices that require only a single memslot,
+     * required for all other memory devices: Return the number of memslots
+     * (distinct RAM memory regions in the device memory region) that are
+     * required by the device.
+     *
+     * If this function is not implemented, the assumption is "1".
+     *
+     * Called when (un)plugging the memory device, to check if the requirements
+     * can be satisfied, and to do proper accounting.
+     */
+    unsigned int (*get_memslots)(MemoryDeviceState *md);
+
+    /*
      * Optional: Return the desired minimum alignment of the device in guest
      * physical address space. The final alignment is computed based on this
      * alignment and the alignment requirements of the memory region.
@@ -105,8 +139,31 @@ struct MemoryDeviceClass {
                              MemoryDeviceInfo *info);
 };
 
+/*
+ * Traditionally, KVM/vhost in many setups supported 509 memslots, whereby
+ * 253 memslots were "reserved" for boot memory and other devices (such
+ * as PCI BARs, which can get mapped dynamically) and 256 memslots were
+ * dedicated for DIMMs. These magic numbers worked reliably in the past.
+ *
+ * Further, using many memslots can negatively affect performance, so setting
+ * the soft-limit of memslots used by memory devices to the traditional
+ * DIMM limit of 256 sounds reasonable.
+ *
+ * If we have less than 509 memslots, we will instruct memory devices that
+ * support automatically deciding how many memslots to use to only use a single
+ * one.
+ *
+ * Hotplugging vhost devices with at least 509 memslots is not expected to
+ * cause problems, not even when devices automatically decided how many memslots
+ * to use.
+ */
+#define MEMORY_DEVICES_SOFT_MEMSLOT_LIMIT 256
+#define MEMORY_DEVICES_SAFE_MAX_MEMSLOTS 509
+
 MemoryDeviceInfoList *qmp_memory_device_list(void);
 uint64_t get_plugged_memory_size(void);
+unsigned int memory_devices_get_reserved_memslots(void);
+bool memory_devices_memslot_auto_decision_active(void);
 void memory_device_pre_plug(MemoryDeviceState *md, MachineState *ms,
                             const uint64_t *legacy_align, Error **errp);
 void memory_device_plug(MemoryDeviceState *md, MachineState *ms);
diff --git a/include/hw/virtio/vhost-backend.h b/include/hw/virtio/vhost-backend.h
index 1860b541d8..96ccc18cd3 100644
--- a/include/hw/virtio/vhost-backend.h
+++ b/include/hw/virtio/vhost-backend.h
@@ -86,9 +86,6 @@ typedef int (*vhost_set_vring_enable_op)(struct vhost_dev *dev,
 typedef bool (*vhost_requires_shm_log_op)(struct vhost_dev *dev);
 typedef int (*vhost_migration_done_op)(struct vhost_dev *dev,
                                        char *mac_addr);
-typedef bool (*vhost_backend_can_merge_op)(struct vhost_dev *dev,
-                                           uint64_t start1, uint64_t size1,
-                                           uint64_t start2, uint64_t size2);
 typedef int (*vhost_vsock_set_guest_cid_op)(struct vhost_dev *dev,
                                             uint64_t guest_cid);
 typedef int (*vhost_vsock_set_running_op)(struct vhost_dev *dev, int start);
@@ -108,8 +105,7 @@ typedef int (*vhost_crypto_create_session_op)(struct vhost_dev *dev,
 typedef int (*vhost_crypto_close_session_op)(struct vhost_dev *dev,
                                              uint64_t session_id);
 
-typedef bool (*vhost_backend_mem_section_filter_op)(struct vhost_dev *dev,
-                                                MemoryRegionSection *section);
+typedef bool (*vhost_backend_no_private_memslots_op)(struct vhost_dev *dev);
 
 typedef int (*vhost_get_inflight_fd_op)(struct vhost_dev *dev,
                                         uint16_t queue_size,
@@ -138,6 +134,7 @@ typedef struct VhostOps {
     vhost_backend_init vhost_backend_init;
     vhost_backend_cleanup vhost_backend_cleanup;
     vhost_backend_memslots_limit vhost_backend_memslots_limit;
+    vhost_backend_no_private_memslots_op vhost_backend_no_private_memslots;
     vhost_net_set_backend_op vhost_net_set_backend;
     vhost_net_set_mtu_op vhost_net_set_mtu;
     vhost_scsi_set_endpoint_op vhost_scsi_set_endpoint;
@@ -163,7 +160,6 @@ typedef struct VhostOps {
     vhost_set_vring_enable_op vhost_set_vring_enable;
     vhost_requires_shm_log_op vhost_requires_shm_log;
     vhost_migration_done_op vhost_migration_done;
-    vhost_backend_can_merge_op vhost_backend_can_merge;
     vhost_vsock_set_guest_cid_op vhost_vsock_set_guest_cid;
     vhost_vsock_set_running_op vhost_vsock_set_running;
     vhost_set_iotlb_callback_op vhost_set_iotlb_callback;
@@ -172,7 +168,6 @@ typedef struct VhostOps {
     vhost_set_config_op vhost_set_config;
     vhost_crypto_create_session_op vhost_crypto_create_session;
     vhost_crypto_close_session_op vhost_crypto_close_session;
-    vhost_backend_mem_section_filter_op vhost_backend_mem_section_filter;
     vhost_get_inflight_fd_op vhost_get_inflight_fd;
     vhost_set_inflight_fd_op vhost_set_inflight_fd;
     vhost_dev_start_op vhost_dev_start;
diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h
index 6a173cb9fa..c7e5467693 100644
--- a/include/hw/virtio/vhost.h
+++ b/include/hw/virtio/vhost.h
@@ -315,7 +315,8 @@ uint64_t vhost_get_features(struct vhost_dev *hdev, const int *feature_bits,
  */
 void vhost_ack_features(struct vhost_dev *hdev, const int *feature_bits,
                         uint64_t features);
-bool vhost_has_free_slot(void);
+unsigned int vhost_get_max_memslots(void);
+unsigned int vhost_get_free_memslots(void);
 
 int vhost_net_set_backend(struct vhost_dev *hdev,
                           struct vhost_vring_file *file);
diff --git a/include/hw/virtio/virtio-mem.h b/include/hw/virtio/virtio-mem.h
index ab0fe2b4f2..5f5b02b8f9 100644
--- a/include/hw/virtio/virtio-mem.h
+++ b/include/hw/virtio/virtio-mem.h
@@ -33,6 +33,7 @@ OBJECT_DECLARE_TYPE(VirtIOMEM, VirtIOMEMClass,
 #define VIRTIO_MEM_UNPLUGGED_INACCESSIBLE_PROP "unplugged-inaccessible"
 #define VIRTIO_MEM_EARLY_MIGRATION_PROP "x-early-migration"
 #define VIRTIO_MEM_PREALLOC_PROP "prealloc"
+#define VIRTIO_MEM_DYNAMIC_MEMSLOTS_PROP "dynamic-memslots"
 
 struct VirtIOMEM {
     VirtIODevice parent_obj;
@@ -44,7 +45,28 @@ struct VirtIOMEM {
     int32_t bitmap_size;
     unsigned long *bitmap;
 
-    /* assigned memory backend and memory region */
+    /*
+     * With "dynamic-memslots=on": Device memory region in which we dynamically
+     * map the memslots.
+     */
+    MemoryRegion *mr;
+
+    /*
+     * With "dynamic-memslots=on": The individual memslots (aliases into the
+     * memory backend).
+     */
+    MemoryRegion *memslots;
+
+    /* With "dynamic-memslots=on": The total number of memslots. */
+    uint16_t nb_memslots;
+
+    /*
+     * With "dynamic-memslots=on": Size of one memslot (the size of the
+     * last one can differ).
+     */
+    uint64_t memslot_size;
+
+    /* Assigned memory backend with the RAM memory region. */
     HostMemoryBackend *memdev;
 
     /* NUMA node */
@@ -82,6 +104,12 @@ struct VirtIOMEM {
      */
     bool early_migration;
 
+    /*
+     * Whether we dynamically map (multiple, if possible) memslots instead of
+     * statically mapping the whole RAM memory region.
+     */
+    bool dynamic_memslots;
+
     /* notifiers to notify when "size" changes */
     NotifierList size_change_notifiers;
 
@@ -96,6 +124,8 @@ struct VirtIOMEMClass {
     /* public */
     void (*fill_device_info)(const VirtIOMEM *vmen, VirtioMEMDeviceInfo *vi);
     MemoryRegion *(*get_memory_region)(VirtIOMEM *vmem, Error **errp);
+    void (*decide_memslots)(VirtIOMEM *vmem, unsigned int limit);
+    unsigned int (*get_memslots)(VirtIOMEM *vmem);
     void (*add_size_change_notifier)(VirtIOMEM *vmem, Notifier *notifier);
     void (*remove_size_change_notifier)(VirtIOMEM *vmem, Notifier *notifier);
     void (*unplug_request_check)(VirtIOMEM *vmem, Error **errp);
diff --git a/include/sysemu/cpus.h b/include/sysemu/cpus.h
index 0535a4c68a..b4a566cfe7 100644
--- a/include/sysemu/cpus.h
+++ b/include/sysemu/cpus.h
@@ -50,11 +50,4 @@ void cpu_synchronize_all_post_reset(void);
 void cpu_synchronize_all_post_init(void);
 void cpu_synchronize_all_pre_loadvm(void);
 
-#ifndef CONFIG_USER_ONLY
-/* vl.c */
-/* *-user doesn't have configurable SMP topology */
-extern int smp_cores;
-extern int smp_threads;
-#endif
-
 #endif
diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
index ee9025f8e9..97a8a4f201 100644
--- a/include/sysemu/kvm.h
+++ b/include/sysemu/kvm.h
@@ -215,7 +215,8 @@ typedef struct KVMRouteChange {
 
 /* external API */
 
-bool kvm_has_free_slot(MachineState *ms);
+unsigned int kvm_get_max_memslots(void);
+unsigned int kvm_get_free_memslots(void);
 bool kvm_has_sync_mmu(void);
 int kvm_has_vcpu_events(void);
 int kvm_has_robust_singlestep(void);
@@ -552,7 +553,6 @@ int kvm_set_one_reg(CPUState *cs, uint64_t id, void *source);
  */
 int kvm_get_one_reg(CPUState *cs, uint64_t id, void *target);
 struct ppc_radix_page_info *kvm_get_radix_page_info(void);
-int kvm_get_max_memslots(void);
 
 /* Notify resamplefd for EOI of specific interrupts. */
 void kvm_resample_fd_notify(int gsi);
diff --git a/include/sysemu/kvm_int.h b/include/sysemu/kvm_int.h
index a5b9122cb8..075939a3c4 100644
--- a/include/sysemu/kvm_int.h
+++ b/include/sysemu/kvm_int.h
@@ -40,6 +40,7 @@ typedef struct KVMMemoryUpdate {
 typedef struct KVMMemoryListener {
     MemoryListener listener;
     KVMSlot *slots;
+    unsigned int nr_used_slots;
     int as_id;
     QSIMPLEQ_HEAD(, KVMMemoryUpdate) transaction_add;
     QSIMPLEQ_HEAD(, KVMMemoryUpdate) transaction_del;
diff --git a/include/sysemu/runstate.h b/include/sysemu/runstate.h
index 08afb97695..c8c2bd8a61 100644
--- a/include/sysemu/runstate.h
+++ b/include/sysemu/runstate.h
@@ -68,6 +68,8 @@ void qemu_system_wakeup_request(WakeupReason reason, Error **errp);
 void qemu_system_wakeup_enable(WakeupReason reason, bool enabled);
 void qemu_register_wakeup_notifier(Notifier *notifier);
 void qemu_register_wakeup_support(void);
+void qemu_system_shutdown_request_with_code(ShutdownCause reason,
+                                            int exit_code);
 void qemu_system_shutdown_request(ShutdownCause reason);
 void qemu_system_powerdown_request(void);
 void qemu_register_powerdown_notifier(Notifier *notifier);
diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
index 25be2a692e..73a37949c2 100644
--- a/include/sysemu/sysemu.h
+++ b/include/sysemu/sysemu.h
@@ -101,7 +101,7 @@ bool defaults_enabled(void);
 
 void qemu_init(int argc, char **argv);
 int qemu_main_loop(void);
-void qemu_cleanup(void);
+void qemu_cleanup(int);
 
 extern QemuOptsList qemu_legacy_drive_opts;
 extern QemuOptsList qemu_common_drive_opts;