diff --git a/tests/ahci-test.c b/tests/ahci-test.c
index 32b6be3b926fc2c709d5f1fb27dd653247548072..4cc7e21a43b7daa6c11c41c76f35f3acae383dfb 100644
--- a/tests/ahci-test.c
+++ b/tests/ahci-test.c
@@ -751,6 +751,7 @@ static void ahci_test_identify(AHCIQState *ahci)
     ahci_port_check_error(ahci, i);
     /* BUG: we expect AHCI_PX_IS_DPS to be set. */
     ahci_port_check_interrupts(ahci, i, AHCI_PX_IS_DHRS | AHCI_PX_IS_PSS);
+    ahci_port_check_nonbusy(ahci, i, cx);
 
     /* Investigate the CMD, assert that we read 512 bytes */
     ahci_get_command_header(ahci, i, cx, &cmd);
diff --git a/tests/libqos/ahci.c b/tests/libqos/ahci.c
index ef84cc6660e651091283e2c837cf1dd698513f9f..7ed649480511b01afd90d2444aec8fc10102aeab 100644
--- a/tests/libqos/ahci.c
+++ b/tests/libqos/ahci.c
@@ -347,6 +347,24 @@ void ahci_port_check_interrupts(AHCIQState *ahci, uint8_t port,
     g_assert_cmphex(ahci_px_rreg(ahci, port, AHCI_PX_IS), ==, 0);
 }
 
+void ahci_port_check_nonbusy(AHCIQState *ahci, uint8_t port, uint8_t slot)
+{
+    uint32_t reg;
+
+    /* Assert that the command slot is no longer busy (NCQ) */
+    reg = ahci_px_rreg(ahci, port, AHCI_PX_SACT);
+    ASSERT_BIT_CLEAR(reg, (1 << slot));
+
+    /* Non-NCQ */
+    reg = ahci_px_rreg(ahci, port, AHCI_PX_CI);
+    ASSERT_BIT_CLEAR(reg, (1 << slot));
+
+    /* And assert that we are generally not busy. */
+    reg = ahci_px_rreg(ahci, port, AHCI_PX_TFD);
+    ASSERT_BIT_CLEAR(reg, AHCI_PX_TFD_STS_BSY);
+    ASSERT_BIT_CLEAR(reg, AHCI_PX_TFD_STS_DRQ);
+}
+
 /* Get the command in #slot of port #port. */
 void ahci_get_command_header(AHCIQState *ahci, uint8_t port,
                              uint8_t slot, AHCICommandHeader *cmd)
diff --git a/tests/libqos/ahci.h b/tests/libqos/ahci.h
index a2ffa70d222a3dc1e9f33662130b6dbd3389631d..eaad076f467275068a6be496b5c20a2f02c2761c 100644
--- a/tests/libqos/ahci.h
+++ b/tests/libqos/ahci.h
@@ -436,6 +436,7 @@ void ahci_port_clear(AHCIQState *ahci, uint8_t port);
 void ahci_port_check_error(AHCIQState *ahci, uint8_t port);
 void ahci_port_check_interrupts(AHCIQState *ahci, uint8_t port,
                                 uint32_t intr_mask);
+void ahci_port_check_nonbusy(AHCIQState *ahci, uint8_t port, uint8_t slot);
 void ahci_get_command_header(AHCIQState *ahci, uint8_t port,
                              uint8_t slot, AHCICommandHeader *cmd);
 void ahci_set_command_header(AHCIQState *ahci, uint8_t port,