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| author | David Hildenbrand <david@redhat.com> | 2021-04-13 11:55:25 +0200 |
|---|---|---|
| committer | Eduardo Habkost <ehabkost@redhat.com> | 2021-07-08 15:54:45 -0400 |
| commit | 3eed155caf0a9a6db1e140c01bd8f0300ac475ce (patch) | |
| tree | a1eb16060e7b1931ccd9ddd2d2cc5279a27b658c /hw/vfio | |
| parent | 5e3b981c330c58c4e97ab85e40c3bd2ee54b2fa7 (diff) | |
| download | qemu-3eed155caf0a9a6db1e140c01bd8f0300ac475ce.zip qemu-3eed155caf0a9a6db1e140c01bd8f0300ac475ce.tar.gz qemu-3eed155caf0a9a6db1e140c01bd8f0300ac475ce.tar.bz2 | |
vfio: Query and store the maximum number of possible DMA mappings
Let's query the maximum number of possible DMA mappings by querying the
available mappings when creating the container (before any mappings are
created). We'll use this informaton soon to perform some sanity checks
and warn the user.
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Auger Eric <eric.auger@redhat.com>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: teawater <teawaterz@linux.alibaba.com>
Cc: Marek Kedzierski <mkedzier@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20210413095531.25603-8-david@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Diffstat (limited to 'hw/vfio')
| -rw-r--r-- | hw/vfio/common.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/hw/vfio/common.c b/hw/vfio/common.c index 5af7755..79628d6 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -1931,6 +1931,7 @@ static int vfio_connect_container(VFIOGroup *group, AddressSpace *as, container->fd = fd; container->error = NULL; container->dirty_pages_supported = false; + container->dma_max_mappings = 0; QLIST_INIT(&container->giommu_list); QLIST_INIT(&container->hostwin_list); QLIST_INIT(&container->vrdl_list); @@ -1962,7 +1963,10 @@ static int vfio_connect_container(VFIOGroup *group, AddressSpace *as, vfio_host_win_add(container, 0, (hwaddr)-1, info->iova_pgsizes); container->pgsizes = info->iova_pgsizes; + /* The default in the kernel ("dma_entry_limit") is 65535. */ + container->dma_max_mappings = 65535; if (!ret) { + vfio_get_info_dma_avail(info, &container->dma_max_mappings); vfio_get_iommu_info_migration(container, info); } g_free(info); |