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backends/iommufd: change process ioctl

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Define the change process ioctl

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Link: https://lore.kernel.org/qemu-devel/1751493538-202042-7-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Steve Sistare 2025-07-02 14:58:43 -07:00 • committed by Cédric Le Goater
parent e563dc88c2
commit ab48cedc64
3 changed files with 28 additions and 0 deletions
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24
backends/iommufd.c
View file

@ -73,6 +73,30 @@ static void iommufd_backend_class_init(ObjectClass *oc, const void *data)
object_class_property_add_str(oc, "fd", NULL, iommufd_backend_set_fd);
}
bool iommufd_change_process_capable(IOMMUFDBackend *be)
{
struct iommu_ioas_change_process args = {.size = sizeof(args)};
/*
* Call IOMMU_IOAS_CHANGE_PROCESS to verify it is a recognized ioctl.
* This is a no-op if the process has not changed since DMA was mapped.
*/
return !ioctl(be->fd, IOMMU_IOAS_CHANGE_PROCESS, &args);
}
bool iommufd_change_process(IOMMUFDBackend *be, Error **errp)
{
struct iommu_ioas_change_process args = {.size = sizeof(args)};
bool ret = !ioctl(be->fd, IOMMU_IOAS_CHANGE_PROCESS, &args);
if (!ret) {
error_setg_errno(errp, errno, "IOMMU_IOAS_CHANGE_PROCESS fd %d failed",
be->fd);
}
trace_iommufd_change_process(be->fd, ret);
return ret;
}
bool iommufd_backend_connect(IOMMUFDBackend *be, Error **errp)
{
int fd;

1
backends/trace-events
View file

@ -7,6 +7,7 @@ dbus_vmstate_loading(const char *id) "id: %s"
dbus_vmstate_saving(const char *id) "id: %s"
# iommufd.c
iommufd_change_process(int fd, bool ret) "fd=%d (%d)"
iommufd_backend_connect(int fd, bool owned, uint32_t users) "fd=%d owned=%d users=%d"
iommufd_backend_disconnect(int fd, uint32_t users) "fd=%d users=%d"
iommu_backend_set_fd(int fd) "pre-opened /dev/iommu fd=%d"

3
include/system/iommufd.h
View file

@ -69,6 +69,9 @@ bool iommufd_backend_invalidate_cache(IOMMUFDBackend *be, uint32_t id,
uint32_t *entry_num, void *data,
Error **errp);
bool iommufd_change_process_capable(IOMMUFDBackend *be);
bool iommufd_change_process(IOMMUFDBackend *be, Error **errp);
#define TYPE_HOST_IOMMU_DEVICE_IOMMUFD TYPE_HOST_IOMMU_DEVICE "-iommufd"
OBJECT_DECLARE_TYPE(HostIOMMUDeviceIOMMUFD, HostIOMMUDeviceIOMMUFDClass,
HOST_IOMMU_DEVICE_IOMMUFD)