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vfio: Use vfio type1 v2 IOMMU interface

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The difference between v1 and v2 is fairly subtle, simply more
deterministic behavior for unmaps.  The v1 interface allows the user
to attempt to unmap sub-regions of previous mappings, returning
success with zero size if unable to comply.  This was a reflection of
the underlying IOMMU API.  The v2 interface requires that the user
may only unmap fully contained mappings, ie. an unmap cannot intersect
or bisect a previous mapping, but may cover multiple mappings.  QEMU
never made use of the sub-region v1 support anyway, so we can support
either v1 or v2.  We'll favor v2 since it's newer.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Alex Williamson 2015-02-10 10:25:44 -07:00
parent ba5e6bfa1a
commit 2e6e697e16
1 changed files with 6 additions and 2 deletions
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8
hw/vfio/common.c
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@ -662,7 +662,10 @@ static int vfio_connect_container(VFIOGroup *group, AddressSpace *as)
container = g_malloc0(sizeof(*container));
container->space = space;
container->fd = fd;
if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU)) {
if (ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU) ||
ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1v2_IOMMU)) {
bool v2 = !!ioctl(fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1v2_IOMMU);
ret = ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &fd);
if (ret) {
error_report("vfio: failed to set group container: %m");
@ -670,7 +673,8 @@ static int vfio_connect_container(VFIOGroup *group, AddressSpace *as)
goto free_container_exit;
}
ret = ioctl(fd, VFIO_SET_IOMMU, VFIO_TYPE1_IOMMU);
ret = ioctl(fd, VFIO_SET_IOMMU,
v2 ? VFIO_TYPE1v2_IOMMU : VFIO_TYPE1_IOMMU);
if (ret) {
error_report("vfio: failed to set iommu for container: %m");
ret = -errno;