On 12/10/2020 18:09, Philippe Mathieu-Daudé wrote:

Report accesses to reserved registers using qemu_log_mask(GUEST_ERROR).

Signed-off-by: Philippe Mathieu-Daudé <f4...@amsat.org>
---
  hw/pci-host/sabre.c | 8 ++++++++
  1 file changed, 8 insertions(+)

diff --git a/hw/pci-host/sabre.c b/hw/pci-host/sabre.c
index 67699ac9058..cc97c266a57 100644
--- a/hw/pci-host/sabre.c
+++ b/hw/pci-host/sabre.c
@@ -189,7 +189,11 @@ static void sabre_config_write(void *opaque, hwaddr addr,
      case 0xa800 ... 0xa80f: /* Interrupt diagnostics */
      case 0xf000 ... 0xf01f: /* FFB config, memory control */
          /* we don't care */
+        break;
      default:
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Register 0x%04" HWADDR_PRIX " is reserved\n",
+                      __func__, addr);
          break;
      }
  }
@@ -235,7 +239,11 @@ static uint64_t sabre_config_read(void *opaque,
      case 0xa800 ... 0xa80f: /* Interrupt diagnostics */
      case 0xf000 ... 0xf01f: /* FFB config, memory control */
          /* we don't care */
+        break;
      default:
+        qemu_log_mask(LOG_GUEST_ERROR,
+                      "%s: Register 0x%04" HWADDR_PRIX " is reserved\n",
+                      __func__, addr);
          break;
      }
      trace_sabre_config_read(addr, val);

As per my comment on patch 4, I think these should be logged at LOG_UNIMP and the message changed to "is unimplemented". Other than that:

Reviewed-by: Mark Cave-Ayland <mark.cave-ayl...@ilande.co.uk>


ATB,

Mark.

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