1 files changed, 55 insertions, 1 deletions

diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c
index b5aa1067df..6c6ed9a776 100644
--- a/hw/mem/cxl_type3.c
+++ b/hw/mem/cxl_type3.c
@@ -8,6 +8,7 @@
 #include "qapi/error.h"
 #include "qemu/log.h"
 #include "qemu/module.h"
+#include "qemu/pmem.h"
 #include "qemu/range.h"
 #include "qemu/rcu.h"
 #include "sysemu/hostmem.h"
@@ -113,6 +114,11 @@ static bool cxl_setup_memory(CXLType3Dev *ct3d, Error **errp)
     host_memory_backend_set_mapped(ct3d->hostmem, true);
     ct3d->cxl_dstate.pmem_size = ct3d->hostmem->size;
 
+    if (!ct3d->lsa) {
+        error_setg(errp, "lsa property must be set");
+        return false;
+    }
+
     return true;
 }
 
@@ -176,12 +182,58 @@ static void ct3d_reset(DeviceState *dev)
 static Property ct3_props[] = {
     DEFINE_PROP_LINK("memdev", CXLType3Dev, hostmem, TYPE_MEMORY_BACKEND,
                      HostMemoryBackend *),
+    DEFINE_PROP_LINK("lsa", CXLType3Dev, lsa, TYPE_MEMORY_BACKEND,
+                     HostMemoryBackend *),
     DEFINE_PROP_END_OF_LIST(),
 };
 
 static uint64_t get_lsa_size(CXLType3Dev *ct3d)
 {
-    return 0;
+    MemoryRegion *mr;
+
+    mr = host_memory_backend_get_memory(ct3d->lsa);
+    return memory_region_size(mr);
+}
+
+static void validate_lsa_access(MemoryRegion *mr, uint64_t size,
+                                uint64_t offset)
+{
+    assert(offset + size <= memory_region_size(mr));
+    assert(offset + size > offset);
+}
+
+static uint64_t get_lsa(CXLType3Dev *ct3d, void *buf, uint64_t size,
+                    uint64_t offset)
+{
+    MemoryRegion *mr;
+    void *lsa;
+
+    mr = host_memory_backend_get_memory(ct3d->lsa);
+    validate_lsa_access(mr, size, offset);
+
+    lsa = memory_region_get_ram_ptr(mr) + offset;
+    memcpy(buf, lsa, size);
+
+    return size;
+}
+
+static void set_lsa(CXLType3Dev *ct3d, const void *buf, uint64_t size,
+                    uint64_t offset)
+{
+    MemoryRegion *mr;
+    void *lsa;
+
+    mr = host_memory_backend_get_memory(ct3d->lsa);
+    validate_lsa_access(mr, size, offset);
+
+    lsa = memory_region_get_ram_ptr(mr) + offset;
+    memcpy(lsa, buf, size);
+    memory_region_set_dirty(mr, offset, size);
+
+    /*
+     * Just like the PMEM, if the guest is not allowed to exit gracefully, label
+     * updates will get lost.
+     */
 }
 
 static void ct3_class_init(ObjectClass *oc, void *data)
@@ -203,6 +255,8 @@ static void ct3_class_init(ObjectClass *oc, void *data)
     device_class_set_props(dc, ct3_props);
 
     cvc->get_lsa_size = get_lsa_size;
+    cvc->get_lsa = get_lsa;
+    cvc->set_lsa = set_lsa;
 }
 
 static const TypeInfo ct3d_info = {