[PATCH v4 0/4] softmmu/memory_mapping: optimize dump/tpm for virtio-mem

[David Hildenbrand]

Minor fixes and cleanups, followed by an optimization for virtio-mem
regarding guest dumps and tpm.

virtio-mem logically plugs/unplugs memory within a sparse memory region
and notifies via the RamDiscardMgr interface when parts become
plugged (populated) or unplugged (discarded).

Currently, guest_phys_blocks_append() appends the whole (sparse)
virtio-mem managed region and therefore tpm code might zero the hole
region and dump code will dump the whole region. Let's only add logically
plugged (populated) parts of that region, skipping over logically
unplugged (discarded) parts by reusing the RamDiscardMgr infrastructure
introduced to handle virtio-mem + VFIO properly.

v3 -> v4:
- "tpm: mark correct memory region range dirty when clearing RAM"
-- Finally get it right :) I tried triggering that code without luck. So
   I ended up forcing that call path, verifying that the offset into
   memory regions is now correct.

v2 -> v3:
- "tpm: mark correct memory region range dirty when clearing RAM"
-- Fix calculation of offset into memory region (thanks Peter!)
- "softmmu/memory_mapping: reuse qemu_get_guest_simple_memory_mapping()"
-- Dropped

v1 -> v2:
- "softmmu/memory_mapping: factor out adding physical memory ranges"
-- Simplify based on RamDiscardManager changes: add using a
   MemoryRegionSection
- "softmmu/memory_mapping: optimize for RamDiscardManager sections"
-- Simplify based on RamDiscardManager changes

David Hildenbrand (4):
  tpm: mark correct memory region range dirty when clearing RAM
  softmmu/memory_mapping: never merge ranges accross memory regions
  softmmu/memory_mapping: factor out adding physical memory ranges
  softmmu/memory_mapping: optimize for RamDiscardManager sections

 hw/tpm/tpm_ppi.c         |  5 +++-
 softmmu/memory_mapping.c | 64 ++++++++++++++++++++++++++--------------
 2 files changed, 46 insertions(+), 23 deletions(-)

-- 
2.31.1