ARMv8.2 introduced support for Data Cache Clean instructions to PoP
(point-of-persistence) and PoDP (point-of-deep-persistence):
ARMv8.2-DCCVAP & ARMv8.2-DCCVADP respectively.
This patch set adds support for emulating both, though there is no
distinction between the two points: the PoDP is assumed to represent
the same point of persistence as PoP. Case there is no such point specified
for the considered memory system both will fall back to the DV CVAC inst
(clean up to the point of coherency).
The changes introduced include adding probe_read for validating read memory
access to allow verification for mandatory read access for both cache
clean instructions, along with support for writeback for requested memory
regions through msync, if one is available, based otherwise on fsyncdata.
As currently the virt platform is missing support for NVDIMM,
the changes have been tested with [1] & [2]
[1] https://patchwork.kernel.org/cover/10830237/
[2] https://patchwork.kernel.org/project/qemu-devel/list/?series=159441
v3:
- Assert on invalid sync range for ram block
- Drop alignment handling from qemu_msync
v2:
- Moved the msync into a qemu wrapper with
CONFIG_POSIX switch + additional comments
- Fixed length alignment
- Dropped treating the DC CVAP/CVADP as special case
and moved those to conditional registration
- Dropped needless locking for grabbing mem region
Beata Michalska (4):
tcg: cputlb: Add probe_read
Memory: Enable writeback for given memory region
migration: ram: Switch to ram block writeback
target/arm: Add support for DC CVAP & DC CVADP ins
exec.c | 36 +++++++++++++++++++++++++++++++
include/exec/exec-all.h | 6 ++++++
include/exec/memory.h | 6 ++++++
include/exec/ram_addr.h | 8 +++++++
include/qemu/cutils.h | 1 +
linux-user/elfload.c | 2 ++
memory.c | 12 +++++++++++
migration/ram.c | 5 +----
target/arm/cpu.h | 10 +++++++++
target/arm/cpu64.c | 1 +
target/arm/helper.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++++
util/cutils.c | 38 +++++++++++++++++++++++++++++++++
12 files changed, 177 insertions(+), 4 deletions(-)
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2.7.4