[RFC v5 23/28] hw/pci: Add sec-sid property to PCIDevice

Arm SMMUv3 uses a SEC_SID (StreamID Security state) to determine the
security state of the programming interface that controls a transaction.
The architecture explicitly states that the association between a device
and its SEC_SID is a system-defined property, not something derived from
the physical address space.

We need a way to represent this system-defined SEC_SID for PCI devices
if we want to implement SMMU's Secure state. So that SMMUv3 can select
the correct register bank and configuration when handling their streams.

This patch adds a new char *sec_sid field to PCIDevice, together with
a "sec-sid" QOM property. The property is intended to carry the
platform-defined SEC_SID for the device; for now only Non-secure and
Secure security states are supported.

Signed-off-by: Tao Tang <[email protected]>
Reviewed-by: Pierrick Bouvier <[email protected]>
---
 hw/pci/pci.c                | 7 +++++++
 include/hw/pci/pci_device.h | 3 +++
 2 files changed, 10 insertions(+)

diff --git a/hw/pci/pci.c b/hw/pci/pci.c
index d3191609e28..b86135af96d 100644
--- a/hw/pci/pci.c
+++ b/hw/pci/pci.c
@@ -104,6 +104,13 @@ static const Property pci_props[] = {
     DEFINE_PROP_STRING("sriov-pf", PCIDevice, sriov_pf),
     DEFINE_PROP_BIT("x-pcie-ext-tag", PCIDevice, cap_present,
                     QEMU_PCIE_EXT_TAG_BITNR, true),
+
+    /*
+     * System-defined, statically configured SEC_SID for this PCI device, used
+     * by Arm SMMU. Only support "non-secure" and "secure" security states.
+     */
+    DEFINE_PROP_STRING("sec-sid", PCIDevice, sec_sid),
+
     { .name = "busnr", .info = &prop_pci_busnr },
 };
 
diff --git a/include/hw/pci/pci_device.h b/include/hw/pci/pci_device.h
index 5cac6e16886..6e6c49fdd19 100644
--- a/include/hw/pci/pci_device.h
+++ b/include/hw/pci/pci_device.h
@@ -187,6 +187,9 @@ struct PCIDevice {
     uint32_t max_bounce_buffer_size;
 
     char *sriov_pf;
+
+    /* Arm SMMU SEC_SID */
+    char *sec_sid;
 };
 
 static inline int pci_intx(PCIDevice *pci_dev)
-- 
2.34.1