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hw/cxl: QMP based poison injection support

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Inject poison using QMP command cxl-inject-poison to add an entry to the
poison list.

For now, the poison is not returned CXL.mem reads, but only via the
mailbox command Get Poison List. So a normal memory read to an address
that is on the poison list will not yet result in a synchronous exception
(and similar for partial cacheline writes).
That is left for a future patch.

See CXL rev 3.0, sec 8.2.9.8.4.1 Get Poison list (Opcode 4300h)

Kernel patches to use this interface here:
https://lore.kernel.org/linux-cxl/cover.1665606782.git.alison.schofield@intel.com/

To inject poison using QMP (telnet to the QMP port)
{ "execute": "qmp_capabilities" }

{ "execute": "cxl-inject-poison",
    "arguments": {
         "path": "/machine/peripheral/cxl-pmem0",
         "start": 2048,
         "length": 256
    }
}

Adjusted to select a device on your machine.

Note that the poison list supported is kept short enough to avoid the
complexity of state machine that is needed to handle the MORE flag.

Reviewed-by: Fan Ni <fan.ni@samsung.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20230526170010.574-3-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jonathan Cameron 2023-05-26 18:00:08 +01:00 • committed by Michael S. Tsirkin
parent 14180d6221
commit 9547754f40
6 changed files with 194 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

20
include/hw/cxl/cxl_device.h
View file

@ -242,6 +242,18 @@ typedef struct CXLError {
typedef QTAILQ_HEAD(, CXLError) CXLErrorList;
typedef struct CXLPoison {
uint64_t start, length;
uint8_t type;
#define CXL_POISON_TYPE_EXTERNAL 0x1
#define CXL_POISON_TYPE_INTERNAL 0x2
#define CXL_POISON_TYPE_INJECTED 0x3
QLIST_ENTRY(CXLPoison) node;
} CXLPoison;
typedef QLIST_HEAD(, CXLPoison) CXLPoisonList;
#define CXL_POISON_LIST_LIMIT 256
struct CXLType3Dev {
/* Private */
PCIDevice parent_obj;
@ -264,6 +276,12 @@ struct CXLType3Dev {
/* Error injection */
CXLErrorList error_list;
/* Poison Injection - cache */
CXLPoisonList poison_list;
unsigned int poison_list_cnt;
bool poison_list_overflowed;
uint64_t poison_list_overflow_ts;
};
#define TYPE_CXL_TYPE3 "cxl-type3"
@ -289,4 +307,6 @@ MemTxResult cxl_type3_write(PCIDevice *d, hwaddr host_addr, uint64_t data,
uint64_t cxl_device_get_timestamp(CXLDeviceState *cxlds);
void cxl_set_poison_list_overflowed(CXLType3Dev *ct3d);
#endif