[PULL 10/12] hw/cxl: Correctly handle variable sized mailbox input payloads.

["Michael S. Tsirkin" <mst@redhat.com>]

From: Jonathan Cameron <Jonathan.Cameron@huawei.com>

A placeholder of ~0 is used to indicate variable payload size.
Whilst the checks for output payload correctly took this into
account, those for input payload did not.

This results in failure of the Set LSA command.

Fixes: 464e14ac43 ("hw/cxl/device: Implement basic mailbox (8.2.8.4)")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20220817145759.32603-4-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/cxl/cxl-mailbox-utils.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
index 3cea8b17a8..bc1bb18844 100644
--- a/hw/cxl/cxl-mailbox-utils.c
+++ b/hw/cxl/cxl-mailbox-utils.c
@@ -425,7 +425,7 @@ void cxl_process_mailbox(CXLDeviceState *cxl_dstate)
     cxl_cmd = &cxl_cmd_set[set][cmd];
     h = cxl_cmd->handler;
     if (h) {
-        if (len == cxl_cmd->in) {
+        if (len == cxl_cmd->in || cxl_cmd->in == ~0) {
             cxl_cmd->payload = cxl_dstate->mbox_reg_state +
                 A_CXL_DEV_CMD_PAYLOAD;
             ret = (*h)(cxl_cmd, cxl_dstate, &len);
-- 
MST