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[PATCH qemu v2 0/2] target/arm: Improve user-mode compatibility with JIT
From: |
~jhogberg |
Subject: |
[PATCH qemu v2 0/2] target/arm: Improve user-mode compatibility with JITs |
Date: |
Mon, 12 Jun 2023 09:40:36 +0000 |
The previous version of this got mangled, so I'm re-sending it through
sourcehut as mentioned in the documentation in the hopes that it's
foolproof. Sorry about the extra traffic :-(
----
When running in user-mode QEMU currently fails to emulate JITs that
use dual-mapped code to get around W^X restrictions, where one mapping
is writable and one is executable. As it has no way of knowing that a
write to the writable region is reflected in the executable one, it
fails to invalidate previously translated code which leads to a crash
at best.
(Note that system mode is unaffected as the softmmu is fully aware of
what is going on.)
This patch series catches changes to dual-mapped code by honoring the
cache management instructions required to make things work on actual
hardware.
See https://gitlab.com/qemu-project/qemu/-/issues/1034 for more
background information
John Högberg (2):
target/arm: Handle IC IVAU to improve compatibility with JITs
tests/tcg/aarch64: Add testcases for IC IVAU and dual-mapped code
target/arm/helper.c | 47 ++++++-
tests/tcg/aarch64/Makefile.target | 3 +-
tests/tcg/aarch64/icivau.c | 204 ++++++++++++++++++++++++++++++
3 files changed, 250 insertions(+), 4 deletions(-)
create mode 100644 tests/tcg/aarch64/icivau.c
--
2.38.5
- [PATCH qemu v2 0/2] target/arm: Improve user-mode compatibility with JITs,
~jhogberg <=