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backends/iommufd: iommufd_backend_map_file_dma

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Define iommufd_backend_map_file_dma to implement IOMMU_IOAS_MAP_FILE.
This will be called as a substitute for iommufd_backend_map_dma, so
the error conditions for BARs are copied as-is from that function.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Link: https://lore.kernel.org/qemu-devel/1751493538-202042-6-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 14:58:42 -07:00 • committed by Cédric Le Goater
parent ccfc6715cf
commit e563dc88c2
3 changed files with 38 additions and 0 deletions
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34
backends/iommufd.c
View file

@ -172,6 +172,40 @@ int iommufd_backend_map_dma(IOMMUFDBackend *be, uint32_t ioas_id, hwaddr iova,
return ret;
}
int iommufd_backend_map_file_dma(IOMMUFDBackend *be, uint32_t ioas_id,
hwaddr iova, ram_addr_t size,
int mfd, unsigned long start, bool readonly)
{
int ret, fd = be->fd;
struct iommu_ioas_map_file map = {
.size = sizeof(map),
.flags = IOMMU_IOAS_MAP_READABLE |
IOMMU_IOAS_MAP_FIXED_IOVA,
.ioas_id = ioas_id,
.fd = mfd,
.start = start,
.iova = iova,
.length = size,
};
if (!readonly) {
map.flags |= IOMMU_IOAS_MAP_WRITEABLE;
}
ret = ioctl(fd, IOMMU_IOAS_MAP_FILE, &map);
trace_iommufd_backend_map_file_dma(fd, ioas_id, iova, size, mfd, start,
readonly, ret);
if (ret) {
ret = -errno;
/* TODO: Not support mapping hardware PCI BAR region for now. */
if (errno == EFAULT) {
warn_report("IOMMU_IOAS_MAP_FILE failed: %m, PCI BAR?");
}
}
return ret;
}
int iommufd_backend_unmap_dma(IOMMUFDBackend *be, uint32_t ioas_id,
hwaddr iova, ram_addr_t size)
{

1
backends/trace-events
View file

@ -11,6 +11,7 @@ iommufd_backend_connect(int fd, bool owned, uint32_t users) "fd=%d owned=%d user
iommufd_backend_disconnect(int fd, uint32_t users) "fd=%d users=%d"
iommu_backend_set_fd(int fd) "pre-opened /dev/iommu fd=%d"
iommufd_backend_map_dma(int iommufd, uint32_t ioas, uint64_t iova, uint64_t size, void *vaddr, bool readonly, int ret) " iommufd=%d ioas=%d iova=0x%"PRIx64" size=0x%"PRIx64" addr=%p readonly=%d (%d)"
iommufd_backend_map_file_dma(int iommufd, uint32_t ioas, uint64_t iova, uint64_t size, int fd, unsigned long start, bool readonly, int ret) " iommufd=%d ioas=%d iova=0x%"PRIx64" size=0x%"PRIx64" fd=%d start=%ld readonly=%d (%d)"
iommufd_backend_unmap_dma_non_exist(int iommufd, uint32_t ioas, uint64_t iova, uint64_t size, int ret) " Unmap nonexistent mapping: iommufd=%d ioas=%d iova=0x%"PRIx64" size=0x%"PRIx64" (%d)"
iommufd_backend_unmap_dma(int iommufd, uint32_t ioas, uint64_t iova, uint64_t size, int ret) " iommufd=%d ioas=%d iova=0x%"PRIx64" size=0x%"PRIx64" (%d)"
iommufd_backend_alloc_ioas(int iommufd, uint32_t ioas) " iommufd=%d ioas=%d"

3
include/system/iommufd.h
View file

@ -43,6 +43,9 @@ void iommufd_backend_disconnect(IOMMUFDBackend *be);
bool 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_file_dma(IOMMUFDBackend *be, uint32_t ioas_id,
hwaddr iova, ram_addr_t size, int fd,
unsigned long start, bool readonly);
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,