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[Qemu-devel] [RFC v2 0/5] Move notdirty handling to cputlb
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [RFC v2 0/5] Move notdirty handling to cputlb |
Date: |
Wed, 18 Sep 2019 11:02:46 -0700 |
RFC because it *still* doesn't work, just like v1.
However this time the changes are extremely minimal, and now
I really *really* don't understand why they don't work, because
as far as I can tell the new locking is *identical* with the
current i/o path.
In particular, the actual access happens between _prepare
and _complete, just like before. Indeed, since this doesn't
work as-is, then I can't believe the atomic path works either.
I have included the TLB_BSWAP stuff just so that the
patch set is self-contained.
I did experiment with qemu_ram_addr_from_host_nofail(), but
an assertion for equality with addr + iotlbentry->addr does
not trigger. As expected, really, since that's what the i/o
path uses. One more cleanup for the atomics path...
Ideas?
r~
Richard Henderson (5):
cputlb: Disable __always_inline__ without optimization
cputlb: Replace switches in load/store_helper with callback
cputlb: Introduce TLB_BSWAP
exec: Adjust notdirty tracing
cputlb: Move NOTDIRTY handling from I/O path to TLB path
include/exec/cpu-all.h | 2 +
include/exec/cpu-common.h | 1 -
include/qemu/compiler.h | 11 ++
accel/tcg/cputlb.c | 243 +++++++++++++++++++++-----------------
exec.c | 57 +--------
memory.c | 20 ----
trace-events | 4 +-
7 files changed, 157 insertions(+), 181 deletions(-)
--
2.17.1
- [Qemu-devel] [RFC v2 0/5] Move notdirty handling to cputlb,
Richard Henderson <=
- [Qemu-devel] [RFC v2 1/5] cputlb: Disable __always_inline__ without optimization, Richard Henderson, 2019/09/18
- [Qemu-devel] [RFC v2 2/5] cputlb: Replace switches in load/store_helper with callback, Richard Henderson, 2019/09/18
- [Qemu-devel] [RFC v2 4/5] exec: Adjust notdirty tracing, Richard Henderson, 2019/09/18
- [Qemu-devel] [RFC v2 5/5] cputlb: Move NOTDIRTY handling from I/O path to TLB path, Richard Henderson, 2019/09/18
- [Qemu-devel] [RFC v2 3/5] cputlb: Introduce TLB_BSWAP, Richard Henderson, 2019/09/18