motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-04 16:23:55 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

tcg/cputlb: Remove non-synced variants of global TLB flushes

Browse source 
These are no longer used.

  tlb_flush_all_cpus: removed by previous commit.
  tlb_flush_page_all_cpus: removed by previous commit.

  tlb_flush_page_bits_by_mmuidx_all_cpus: never used.
  tlb_flush_page_by_mmuidx_all_cpus: never used.
  tlb_flush_page_bits_by_mmuidx_all_cpus: never used, thus:
    tlb_flush_range_by_mmuidx_all_cpus: never used.
    tlb_flush_by_mmuidx_all_cpus: never used.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
This commit is contained in:
Nicholas Piggin 2024-03-27 00:04:20 +10:00
parent 82676f1fc4
commit 99cd12ced1
3 changed files with 21 additions and 196 deletions
Download patch file Download diff file Expand all files Collapse all files

13
docs/devel/multi-thread-tcg.rst
View file

@ -205,15 +205,10 @@ DESIGN REQUIREMENTS:
(Current solution)
We have updated cputlb.c to defer operations when a cross-vCPU
operation with async_run_on_cpu() which ensures each vCPU sees a
coherent state when it next runs its work (in a few instructions
time).
A new set up operations (tlb_flush_*_all_cpus) take an additional flag
which when set will force synchronisation by setting the source vCPUs
work as "safe work" and exiting the cpu run loop. This ensure by the
time execution restarts all flush operations have completed.
A new set of tlb flush operations (tlb_flush_*_all_cpus_synced) force
synchronisation by setting the source vCPUs work as "safe work" and
exiting the cpu run loop. This ensures that by the time execution
restarts all flush operations have completed.
TLB flag updates are all done atomically and are also protected by the
corresponding page lock.