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backends/host_iommu_device: Introduce HostIOMMUDeviceCaps

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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 <clg@redhat.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Zhenzhong Duan 2024-06-05 16:30:28 +08:00 committed by Cédric Le Goater
parent 1f94b21801
commit 38998c79a1
1 changed files with 38 additions and 0 deletions
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38
include/sysemu/host_iommu_device.h
View file

@ -15,6 +15,18 @@
#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)
@ -22,6 +34,7 @@ struct HostIOMMUDevice {
Object parent_obj;
char *name;
HostIOMMUDeviceCaps caps;
};
/**
@ -49,5 +62,30 @@ 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
#define HOST_IOMMU_DEVICE_CAP_AW_BITS_MAX 64
#endif