This is v2 draft patch set. It mainly functions as the following steps:
1. Checking if it's in kdump kernel and previously enabled
2. If yes do below operatons:
a. Do not disable amd iommu and do not touch dev tables before coping old
dev tables
b. Copy dev table from old kernel and set the old domain id in
amd_iommu_pd_alloc_bitmap
c. Copy irq tables from old kernel
d. Copy command buffer and event buffer
e. Don't call update_domain() to set domain->pt_root to dev entries before
device driver initialization.
f. Reset the pre-enabled status in case IOMMU_DMA_OPS of state_next().
Existed problems:
1. It always prints the following message whenever do a flush:
"AMD-Vi: Completion-Wait loop timed out"
2. Maybe there's someing wrong with the old irq remapping handling, the hard
disk can't be brought up
successfully. You can check the attached kdump kernel boot log with this
patchset applied.
Baoquan He (9):
iommu/amd: Use standard bitmap operation to set bitmap
iommu/amd: Detect pre enabled translation
iommu/amd: make several functions global
iommu/amd: add copy_irq_table function
iommu/amd: Add function copy_dev_tables
iommu/amd: Add functions copy_command_buffer/copy_event_buffer
iommu/amd: copy old tables and do not update dev tables before driver
init
iommu/amd: Do not update the information of domain to devtables before
device driver init
iommu/amd: Clear the iommu pre enabled setting
drivers/iommu/amd_iommu.c | 27 +++---
drivers/iommu/amd_iommu_init.c | 208 +++++++++++++++++++++++++++++++++-------
drivers/iommu/amd_iommu_proto.h | 6 ++
drivers/iommu/amd_iommu_types.h | 4 +
4 files changed, 198 insertions(+), 47 deletions(-)
--
2.4.0
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