On 04/03/2026 03.59, [email protected] wrote:
From: Jared Rossi <[email protected]>
Define common functionality for interacting with virtio-pci devices.
Signed-off-by: Jared Rossi <[email protected]>
---
...
diff --git a/pc-bios/s390-ccw/virtio-pci.c b/pc-bios/s390-ccw/virtio-pci.c
new file mode 100644
index 0000000000..2cfb84bf66
--- /dev/null
+++ b/pc-bios/s390-ccw/virtio-pci.c
@@ -0,0 +1,167 @@
+/*
+ * Functionality for virtio-pci
+ *
+ * Copyright 2025 IBM Corp.
+ * Author(s): Jared Rossi <[email protected]>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "clp.h"
+#include "pci.h"
+#include "helper.h"
+#include "virtio.h"
+#include "bswap.h"
+#include "virtio-pci.h"
+#include "s390-time.h"
+#include <stdio.h>
+
+/* Variable offsets used for reads/writes to modern memory regions */
+VirtioPciCap c_cap; /* Common capabilities */
+VirtioPciCap d_cap; /* Device capabilities */
+VirtioPciCap n_cap; /* Notify capabilities */
+uint32_t notify_mult;
+uint16_t q_notify_offset;
+
+static int virtio_pci_set_status(uint8_t status)
+{
+ int rc = vpci_write_byte(c_cap.off + VPCI_C_OFFSET_STATUS, c_cap.bar,
status);
+ if (rc) {
+ puts("Failed to write virtio-pci status");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int virtio_pci_get_status(uint8_t *status)
+{
+ int rc = vpci_read_byte(c_cap.off + VPCI_C_OFFSET_STATUS, c_cap.bar,
status);
+ if (rc) {
+ puts("Failed to read virtio-pci status");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+/* virtio spec v1.3 section 4.1.2.1 */
+void virtio_pci_id2type(VDev *vdev, uint16_t device_id)
+{
+ switch (device_id) {
+ case 0x1402:
I think it's 0x1042, not 0x1402 ?
+ case 0x1001:
+ vdev->dev_type = VIRTIO_ID_BLOCK;
+ break;
+ default:
+ vdev->dev_type = 0;
+ }
+}
Thomas
