qemu-kvm/kvm-memory-Change-memory_region_set_ram_discard_manager-.patch

From 9e0c4adad755988ea9f94f57a87e000dd7045962 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Fri, 18 Jul 2025 18:11:27 +0200
Subject: [PATCH 112/115] memory: Change
 memory_region_set_ram_discard_manager() to return the result

RH-Author: Paolo Bonzini <pbonzini@redhat.com>
RH-MergeRequest: 391: TDX support, including attestation and device assignment
RH-Jira: RHEL-15710 RHEL-20798 RHEL-49728
RH-Acked-by: Yash Mankad <None>
RH-Acked-by: Peter Xu <peterx@redhat.com>
RH-Acked-by: David Hildenbrand <david@redhat.com>
RH-Commit: [112/115] 43deb5763dfabf964b55c7a6bb4363b96a5020cc (bonzini/rhel-qemu-kvm)

Modify memory_region_set_ram_discard_manager() to return -EBUSY if a
RamDiscardManager is already set in the MemoryRegion. The caller must
handle this failure, such as having virtio-mem undo its actions and fail
the realize() process. Opportunistically move the call earlier to avoid
complex error handling.

This change is beneficial when introducing a new RamDiscardManager
instance besides virtio-mem. After
ram_block_coordinated_discard_require(true) unlocks all
RamDiscardManager instances, only one instance is allowed to be set for
one MemoryRegion at present.

Suggested-by: David Hildenbrand <david@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta@amd.com>
Tested-by: Alexey Kardashevskiy <aik@amd.com>
Reviewed-by: Alexey Kardashevskiy <aik@amd.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
Link: https://lore.kernel.org/r/20250612082747.51539-3-chenyi.qiang@intel.com
Signed-off-by: Peter Xu <peterx@redhat.com>
(cherry picked from commit ff1211154c45c9f7f82116ae9a8c72a848e4a8b5)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/virtio/virtio-mem.c | 30 +++++++++++++++++-------------
 include/exec/memory.h  |  6 +++---
 system/memory.c        | 10 +++++++---
 3 files changed, 27 insertions(+), 19 deletions(-)

diff --git a/hw/virtio/virtio-mem.c b/hw/virtio/virtio-mem.c
index ae26133f58..6284539243 100644
--- a/hw/virtio/virtio-mem.c
+++ b/hw/virtio/virtio-mem.c
@@ -1049,6 +1049,17 @@ static void virtio_mem_device_realize(DeviceState *dev, Error **errp)
         return;
     }
 
+    /*
+     * Set ourselves as RamDiscardManager before the plug handler maps the
+     * memory region and exposes it via an address space.
+     */
+    if (memory_region_set_ram_discard_manager(&vmem->memdev->mr,
+                                              RAM_DISCARD_MANAGER(vmem))) {
+        error_setg(errp, "Failed to set RamDiscardManager");
+        ram_block_coordinated_discard_require(false);
+        return;
+    }
+
     /*
      * We don't know at this point whether shared RAM is migrated using
      * QEMU or migrated using the file content. "x-ignore-shared" will be
@@ -1063,6 +1074,7 @@ static void virtio_mem_device_realize(DeviceState *dev, Error **errp)
         ret = ram_block_discard_range(rb, 0, qemu_ram_get_used_length(rb));
         if (ret) {
             error_setg_errno(errp, -ret, "Unexpected error discarding RAM");
+            memory_region_set_ram_discard_manager(&vmem->memdev->mr, NULL);
             ram_block_coordinated_discard_require(false);
             return;
         }
@@ -1124,13 +1136,6 @@ static void virtio_mem_device_realize(DeviceState *dev, Error **errp)
     vmem->system_reset = VIRTIO_MEM_SYSTEM_RESET(obj);
     vmem->system_reset->vmem = vmem;
     qemu_register_resettable(obj);
-
-    /*
-     * Set ourselves as RamDiscardManager before the plug handler maps the
-     * memory region and exposes it via an address space.
-     */
-    memory_region_set_ram_discard_manager(&vmem->memdev->mr,
-                                          RAM_DISCARD_MANAGER(vmem));
 }
 
 static void virtio_mem_device_unrealize(DeviceState *dev)
@@ -1138,12 +1143,6 @@ static void virtio_mem_device_unrealize(DeviceState *dev)
     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
     VirtIOMEM *vmem = VIRTIO_MEM(dev);
 
-    /*
-     * The unplug handler unmapped the memory region, it cannot be
-     * found via an address space anymore. Unset ourselves.
-     */
-    memory_region_set_ram_discard_manager(&vmem->memdev->mr, NULL);
-
     qemu_unregister_resettable(OBJECT(vmem->system_reset));
     object_unref(OBJECT(vmem->system_reset));
 
@@ -1156,6 +1155,11 @@ static void virtio_mem_device_unrealize(DeviceState *dev)
     virtio_del_queue(vdev, 0);
     virtio_cleanup(vdev);
     g_free(vmem->bitmap);
+    /*
+     * The unplug handler unmapped the memory region, it cannot be
+     * found via an address space anymore. Unset ourselves.
+     */
+    memory_region_set_ram_discard_manager(&vmem->memdev->mr, NULL);
     ram_block_coordinated_discard_require(false);
 }
 
diff --git a/include/exec/memory.h b/include/exec/memory.h
index 71b4a411cc..7cfbe203f4 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -2488,13 +2488,13 @@ static inline bool memory_region_has_ram_discard_manager(MemoryRegion *mr)
  *
  * This function must not be called for a mapped #MemoryRegion, a #MemoryRegion
  * that does not cover RAM, or a #MemoryRegion that already has a
- * #RamDiscardManager assigned.
+ * #RamDiscardManager assigned. Return 0 if the rdm is set successfully.
  *
  * @mr: the #MemoryRegion
  * @rdm: #RamDiscardManager to set
  */
-void memory_region_set_ram_discard_manager(MemoryRegion *mr,
-                                           RamDiscardManager *rdm);
+int memory_region_set_ram_discard_manager(MemoryRegion *mr,
+                                          RamDiscardManager *rdm);
 
 /**
  * memory_region_find: translate an address/size relative to a
diff --git a/system/memory.c b/system/memory.c
index 5e6eb459d5..35011f731e 100644
--- a/system/memory.c
+++ b/system/memory.c
@@ -2083,12 +2083,16 @@ RamDiscardManager *memory_region_get_ram_discard_manager(MemoryRegion *mr)
     return mr->rdm;
 }
 
-void memory_region_set_ram_discard_manager(MemoryRegion *mr,
-                                           RamDiscardManager *rdm)
+int memory_region_set_ram_discard_manager(MemoryRegion *mr,
+                                          RamDiscardManager *rdm)
 {
     g_assert(memory_region_is_ram(mr));
-    g_assert(!rdm || !mr->rdm);
+    if (mr->rdm && rdm) {
+        return -EBUSY;
+    }
+
     mr->rdm = rdm;
+    return 0;
 }
 
 uint64_t ram_discard_manager_get_min_granularity(const RamDiscardManager *rdm,
-- 
2.50.1