hw/cxl: Add clear poison mailbox command support.

Current implementation is very simple so many of the corner
cases do not exist (e.g. fragmenting larger poison list entries)

Reviewed-by: Fan Ni <fan.ni@samsung.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20230526170010.574-5-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c
index ab600735eb..d751803188 100644
--- a/hw/mem/cxl_type3.c
+++ b/hw/mem/cxl_type3.c
@@ -947,6 +947,42 @@ static void set_lsa(CXLType3Dev *ct3d, const void *buf, uint64_t size,
      */
 }
 
+static bool set_cacheline(CXLType3Dev *ct3d, uint64_t dpa_offset, uint8_t *data)
+{
+    MemoryRegion *vmr = NULL, *pmr = NULL;
+    AddressSpace *as;
+
+    if (ct3d->hostvmem) {
+        vmr = host_memory_backend_get_memory(ct3d->hostvmem);
+    }
+    if (ct3d->hostpmem) {
+        pmr = host_memory_backend_get_memory(ct3d->hostpmem);
+    }
+
+    if (!vmr && !pmr) {
+        return false;
+    }
+
+    if (dpa_offset + CXL_CACHE_LINE_SIZE > ct3d->cxl_dstate.mem_size) {
+        return false;
+    }
+
+    if (vmr) {
+        if (dpa_offset < memory_region_size(vmr)) {
+            as = &ct3d->hostvmem_as;
+        } else {
+            as = &ct3d->hostpmem_as;
+            dpa_offset -= memory_region_size(vmr);
+        }
+    } else {
+        as = &ct3d->hostpmem_as;
+    }
+
+    address_space_write(as, dpa_offset, MEMTXATTRS_UNSPECIFIED, &data,
+                        CXL_CACHE_LINE_SIZE);
+    return true;
+}
+
 void cxl_set_poison_list_overflowed(CXLType3Dev *ct3d)
 {
         ct3d->poison_list_overflowed = true;
@@ -1168,6 +1204,7 @@ static void ct3_class_init(ObjectClass *oc, void *data)
     cvc->get_lsa_size = get_lsa_size;
     cvc->get_lsa = get_lsa;
     cvc->set_lsa = set_lsa;
+    cvc->set_cacheline = set_cacheline;
 }
 
 static const TypeInfo ct3d_info = {