6e6d8ac62b
Introduce an iommufd object which allows the interaction with the host /dev/iommu device. The /dev/iommu can have been already pre-opened outside of qemu, in which case the fd can be passed directly along with the iommufd object: This allows the iommufd object to be shared accross several subsystems (VFIO, VDPA, ...). For example, libvirt would open the /dev/iommu once. If no fd is passed along with the iommufd object, the /dev/iommu is opened by the qemu code. Suggested-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Eric Auger <eric.auger@redhat.com> Signed-off-by: Yi Liu <yi.l.liu@intel.com> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com> Reviewed-by: Cédric Le Goater <clg@redhat.com> Tested-by: Eric Auger <eric.auger@redhat.com> Tested-by: Nicolin Chen <nicolinc@nvidia.com> Signed-off-by: Cédric Le Goater <clg@redhat.com>
39 lines
1.1 KiB
C
39 lines
1.1 KiB
C
#ifndef SYSEMU_IOMMUFD_H
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#define SYSEMU_IOMMUFD_H
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#include "qom/object.h"
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#include "qemu/thread.h"
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#include "exec/hwaddr.h"
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#include "exec/cpu-common.h"
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#define TYPE_IOMMUFD_BACKEND "iommufd"
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OBJECT_DECLARE_TYPE(IOMMUFDBackend, IOMMUFDBackendClass, IOMMUFD_BACKEND)
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struct IOMMUFDBackendClass {
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ObjectClass parent_class;
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};
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struct IOMMUFDBackend {
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Object parent;
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/*< protected >*/
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int fd; /* /dev/iommu file descriptor */
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bool owned; /* is the /dev/iommu opened internally */
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QemuMutex lock;
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uint32_t users;
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/*< public >*/
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};
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int iommufd_backend_connect(IOMMUFDBackend *be, Error **errp);
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void iommufd_backend_disconnect(IOMMUFDBackend *be);
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int iommufd_backend_alloc_ioas(IOMMUFDBackend *be, uint32_t *ioas_id,
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Error **errp);
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void iommufd_backend_free_id(IOMMUFDBackend *be, uint32_t id);
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int iommufd_backend_map_dma(IOMMUFDBackend *be, uint32_t ioas_id, hwaddr iova,
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ram_addr_t size, void *vaddr, bool readonly);
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int iommufd_backend_unmap_dma(IOMMUFDBackend *be, uint32_t ioas_id,
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hwaddr iova, ram_addr_t size);
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#endif
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