HostIOMMUDeviceCaps's elements map to the host IOMMU's capabilities.
Different platform IOMMU can support different elements.
Currently only two elements, type and aw_bits, type hints the host
platform IOMMU type, i.e., INTEL vtd, ARM smmu, etc; aw_bits hints
host IOMMU address width.
Introduce .get_cap() handler to check if HOST_IOMMU_DEVICE_CAP_XXX
is supported.
Suggested-by: Cédric Le Goater <c...@redhat.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.d...@intel.com>
---
include/sysemu/host_iommu_device.h | 37 ++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/include/sysemu/host_iommu_device.h
b/include/sysemu/host_iommu_device.h
index 2b58a94d62..d47d1034b1 100644
--- a/include/sysemu/host_iommu_device.h
+++ b/include/sysemu/host_iommu_device.h
@@ -15,11 +15,25 @@
#include "qom/object.h"
#include "qapi/error.h"
+/**
+ * struct HostIOMMUDeviceCaps - Define host IOMMU device capabilities.
+ *
+ * @type: host platform IOMMU type.
+ *
+ * @aw_bits: host IOMMU address width. 0xff if no limitation.
+ */
+typedef struct HostIOMMUDeviceCaps {
+ uint32_t type;
+ uint8_t aw_bits;
+} HostIOMMUDeviceCaps;
+
#define TYPE_HOST_IOMMU_DEVICE "host-iommu-device"
OBJECT_DECLARE_TYPE(HostIOMMUDevice, HostIOMMUDeviceClass, HOST_IOMMU_DEVICE)
struct HostIOMMUDevice {
Object parent_obj;
+
+ HostIOMMUDeviceCaps caps;
};
/**
@@ -47,5 +61,28 @@ struct HostIOMMUDeviceClass {
* Returns: true on success, false on failure.
*/
bool (*realize)(HostIOMMUDevice *hiod, void *opaque, Error **errp);
+ /**
+ * @get_cap: check if a host IOMMU device capability is supported.
+ *
+ * Optional callback, if not implemented, hint not supporting query
+ * of @cap.
+ *
+ * @hiod: pointer to a host IOMMU device instance.
+ *
+ * @cap: capability to check.
+ *
+ * @errp: pass an Error out when fails to query capability.
+ *
+ * Returns: <0 on failure, 0 if a @cap is unsupported, or else
+ * 1 or some positive value for some special @cap,
+ * i.e., HOST_IOMMU_DEVICE_CAP_AW_BITS.
+ */
+ int (*get_cap)(HostIOMMUDevice *hiod, int cap, Error **errp);
};
+
+/*
+ * Host IOMMU device capability list.
+ */
+#define HOST_IOMMU_DEVICE_CAP_IOMMU_TYPE 0
+#define HOST_IOMMU_DEVICE_CAP_AW_BITS 1
#endif
--
2.34.1
