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path: root/hw/s390x/s390-pci-vfio.c
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2020-11-01s390x/pci: get zPCI function info from hostMatthew Rosato
We use the capability chains of the VFIO_DEVICE_GET_INFO ioctl to retrieve the CLP information that the kernel exports. To be compatible with previous kernel versions we fall back on previous predefined values, same as the emulation values, when the ioctl is found to not support capability chains. If individual CLP capabilities are not found, we fall back on default values for only those capabilities missing from the chain. This patch is based on work previously done by Pierre Morel. Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> [aw: non-Linux build fixes] Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2020-11-01s390x/pci: Honor DMA limits set by vfioMatthew Rosato
When an s390 guest is using lazy unmapping, it can result in a very large number of oustanding DMA requests, far beyond the default limit configured for vfio. Let's track DMA usage similar to vfio in the host, and trigger the guest to flush their DMA mappings before vfio runs out. Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> [aw: non-Linux build fixes] Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2020-11-01s390x/pci: Add routine to get the vfio dma available countMatthew Rosato
Create new files for separating out vfio-specific work for s390 pci. Add the first such routine, which issues VFIO_IOMMU_GET_INFO ioctl to collect the current dma available count. Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> [aw: Fix non-Linux build with CONFIG_LINUX] Signed-off-by: Alex Williamson <alex.williamson@redhat.com>