linux/drivers/vfio
Alexey Kardashevskiy 6e301a8e56 KVM: PPC: Optimize clearing TCEs for sparse tables
The powernv platform maintains 2 TCE tables for VFIO - a hardware TCE
table and a table with userspace addresses. These tables are radix trees,
we allocate indirect levels when they are written to. Since
the memory allocation is problematic in real mode, we have 2 accessors
to the entries:
- for virtual mode: it allocates the memory and it is always expected
to return non-NULL;
- fr real mode: it does not allocate and can return NULL.

Also, DMA windows can span to up to 55 bits of the address space and since
we never have this much RAM, such windows are sparse. However currently
the SPAPR TCE IOMMU driver walks through all TCEs to unpin DMA memory.

Since we maintain a userspace addresses table for VFIO which is a mirror
of the hardware table, we can use it to know which parts of the DMA
window have not been mapped and skip these so does this patch.

The bare metal systems do not have this problem as they use a bypass mode
of a PHB which maps RAM directly.

This helps a lot with sparse DMA windows, reducing the shutdown time from
about 3 minutes per 1 billion TCEs to a few seconds for 32GB sparse guest.
Just skipping the last level seems to be good enough.

As non-allocating accessor is used now in virtual mode as well, rename it
from IOMMU_TABLE_USERSPACE_ENTRY_RM (real mode) to _RO (read only).

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
2018-10-20 20:47:02 +11:00
..
mdev vfio/mdev: Re-order sysfs attribute creation 2018-06-08 10:24:30 -06:00
pci VFIO updates for v4.19 2018-08-16 10:34:05 -07:00
platform vfio: platform: Fix using devices in PM Domains 2018-06-08 10:24:37 -06:00
Kconfig vfio: Fix build break when SPAPR_TCE_IOMMU=n 2017-02-08 13:13:25 -07:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vfio_iommu_spapr_tce.c KVM: PPC: Optimize clearing TCEs for sparse tables 2018-10-20 20:47:02 +11:00
vfio_iommu_type1.c vfio: Mark expected switch fall-throughs 2018-08-06 12:22:54 -06:00
vfio_spapr_eeh.c drivers/vfio: Support EEH error injection 2015-05-12 20:33:35 +10:00
vfio.c vfio: use match_string() helper 2018-06-08 10:24:33 -06:00
virqfd.c fs: add new vfs_poll and file_can_poll helpers 2018-05-26 09:16:44 +02:00