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backends/iommufd: Introduce the iommufd object

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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>
This commit is contained in:
Eric Auger 2023-11-21 16:44:00 +08:00 • committed by Cédric Le Goater
parent dbb9d0c969
commit 6e6d8ac62b
8 changed files with 337 additions and 0 deletions
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38
include/sysemu/iommufd.h Normal file
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#ifndef SYSEMU_IOMMUFD_H
#define SYSEMU_IOMMUFD_H
#include "qom/object.h"
#include "qemu/thread.h"
#include "exec/hwaddr.h"
#include "exec/cpu-common.h"
#define TYPE_IOMMUFD_BACKEND "iommufd"
OBJECT_DECLARE_TYPE(IOMMUFDBackend, IOMMUFDBackendClass, IOMMUFD_BACKEND)
struct IOMMUFDBackendClass {
ObjectClass parent_class;
};
struct IOMMUFDBackend {
Object parent;
/*< protected >*/
int fd; /* /dev/iommu file descriptor */
bool owned; /* is the /dev/iommu opened internally */
QemuMutex lock;
uint32_t users;
/*< public >*/
};
int iommufd_backend_connect(IOMMUFDBackend *be, Error **errp);
void iommufd_backend_disconnect(IOMMUFDBackend *be);
int iommufd_backend_alloc_ioas(IOMMUFDBackend *be, uint32_t *ioas_id,
Error **errp);
void iommufd_backend_free_id(IOMMUFDBackend *be, uint32_t id);
int iommufd_backend_map_dma(IOMMUFDBackend *be, uint32_t ioas_id, hwaddr iova,
ram_addr_t size, void *vaddr, bool readonly);
int iommufd_backend_unmap_dma(IOMMUFDBackend *be, uint32_t ioas_id,
hwaddr iova, ram_addr_t size);
#endif