On 9/15/20 6:33 AM, Cornelia Huck wrote:
On Mon, 14 Sep 2020 18:29:28 -0400
Matthew Rosato <mjros...@linux.ibm.com> wrote:
The underlying host may be limiting the number of outstanding DMA
requests for type 1 IOMMU. Add helper functions to check for the
DMA available capability and retrieve the current number of DMA
mappings allowed.
Signed-off-by: Matthew Rosato <mjros...@linux.ibm.com>
---
hw/vfio/common.c | 37 +++++++++++++++++++++++++++++++++++++
include/hw/vfio/vfio-common.h | 2 ++
2 files changed, 39 insertions(+)
(...)
+bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
+ unsigned int *avail)
+{
+ struct vfio_info_cap_header *hdr;
+ struct vfio_iommu_type1_info_dma_avail *cap;
+
+ /* If the capability cannot be found, assume no DMA limiting */
+ hdr = vfio_get_iommu_type1_info_cap(info,
+ VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL);
...don't you need a headers sync first to get the new definitions?
You are right of course, though the associated header change is not yet
merged in the kernel so it's a bit flaky. But bottom line: yes, we
need a header sync first, I'll include one in v3.
(...)
