The XHCI device code uses tracing rather than logging on various code
paths that are so far unimplemented. In some cases, these code paths
actually indicate faulty guest software. This patch switches instances
in the read and write handlers for the port MMIO region to use
qemu_log_mask() with LOG_UNIMP or LOG_GUEST_ERROR, as appropriate in
each case.

Signed-off-by: Phil Dennis-Jordan <phil@philjordan.eu>
---
 hw/usb/hcd-xhci.c | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index 011c445443..00d5bc3779 100644
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -2814,9 +2814,15 @@ static uint64_t xhci_port_read(void *ptr, hwaddr reg, unsigned size)
     case 0x08: /* PORTLI */
         ret = 0;
         break;
-    case 0x0c: /* reserved */
+    case 0x0c: /* PORTHLPMC */
+        ret = 0;
+        qemu_log_mask(LOG_UNIMP, "%s: read from port register PORTHLPMC",
+                      __func__);
+        break;
     default:
-        trace_usb_xhci_unimplemented("port read", reg);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: read from port offset 0x%" HWADDR_PRIx,
+                      __func__, reg);
         ret = 0;
     }
 
@@ -2885,9 +2891,22 @@ static void xhci_port_write(void *ptr, hwaddr reg,
         }
         break;
     case 0x04: /* PORTPMSC */
+    case 0x0c: /* PORTHLPMC */
+        qemu_log_mask(LOG_UNIMP,
+                      "%s: write 0x%" PRIx64
+                      " (%u bytes) to port register at offset 0x%" HWADDR_PRIx,
+                      __func__, val, size, reg);
+        break;
     case 0x08: /* PORTLI */
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: Write to read-only PORTLI register",
+                      __func__);
+        break;
     default:
-        trace_usb_xhci_unimplemented("port write", reg);
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: write 0x%" PRIx64 " (%u bytes) to unknown port "
+                      "register at offset 0x%" HWADDR_PRIx,
+                      __func__, val, size, reg);
+        break;
     }
 }
 
-- 
2.39.5 (Apple Git-154)

On 27/12/24 13:13, Phil Dennis-Jordan wrote:
> The XHCI device code uses tracing rather than logging on various code
> paths that are so far unimplemented. In some cases, these code paths
> actually indicate faulty guest software. This patch switches instances
> in the read and write handlers for the port MMIO region to use
> qemu_log_mask() with LOG_UNIMP or LOG_GUEST_ERROR, as appropriate in
> each case.
> 
> Signed-off-by: Phil Dennis-Jordan <phil@philjordan.eu>
> ---
>   hw/usb/hcd-xhci.c | 25 ++++++++++++++++++++++---
>   1 file changed, 22 insertions(+), 3 deletions(-)

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>