hw/cxl: Add support for device sanitation

Make use of the background operations through the sanitize command, per CXL
3.0 specs. Traditionally run times can be rather long, depending on the
size of the media.

Estimate times based on:
	 https://pmem.io/documents/NVDIMM_DSM_Interface-V1.8.pdf

Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20231023160806.13206-14-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c
index 0529745..cc82205 100644
--- a/hw/mem/cxl_type3.c
+++ b/hw/mem/cxl_type3.c
@@ -23,6 +23,7 @@
 #include "qemu/pmem.h"
 #include "qemu/range.h"
 #include "qemu/rcu.h"
+#include "qemu/guest-random.h"
 #include "sysemu/hostmem.h"
 #include "sysemu/numa.h"
 #include "hw/cxl/cxl.h"
@@ -897,6 +898,11 @@ MemTxResult cxl_type3_read(PCIDevice *d, hwaddr host_addr, uint64_t *data,
         return MEMTX_ERROR;
     }
 
+    if (sanitize_running(&CXL_TYPE3(d)->cci)) {
+        qemu_guest_getrandom_nofail(data, size);
+        return MEMTX_OK;
+    }
+
     return address_space_read(as, dpa_offset, attrs, data, size);
 }
 
@@ -913,6 +919,10 @@ MemTxResult cxl_type3_write(PCIDevice *d, hwaddr host_addr, uint64_t data,
         return MEMTX_ERROR;
     }
 
+    if (sanitize_running(&CXL_TYPE3(d)->cci)) {
+        return MEMTX_OK;
+    }
+
     return address_space_write(as, dpa_offset, attrs, &data, size);
 }