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[PATCH 0/8] target/arm: Misc cleanups surrounding TBI
From: |
Richard Henderson |
Subject: |
[PATCH 0/8] target/arm: Misc cleanups surrounding TBI |
Date: |
Mon, 24 Feb 2020 19:12:10 -0800 |
We have a bug at present wherein we do not supply the memory tag to
the memory system, so that on fault FAR_ELx does not contain the
correct value.
For system mode, we already handle ignoring TBI in get_phys_addr_lpae,
as long as we don't actually drop the tag during translation.
For user mode, we don't have that option, so for now we must simply
accept that we'll get the wrong value in the siginfo_t.
In the process of looking at all that I found:
* Exception return was not applying TBI in copying ELR_ELx to PC,
- Extracting the current mmu_idx can be improved,
- Replicating the TBI bits can allow bit 55 to be used
unconditionally, eliminating a test.
* DC_ZVA was not handling TBI (now only for user-mode)
- The helper need not have been in op_helper.c,
- The helper could have better tcg markup.
* TBI still applies when translation is disabled, and we weren't
raising AddressSpace for bad physical addresses.
* SVE hasn't been updated to handle TBI. I have done nothing about
this for now. For the moment, system mode will work properly, while
user-only will only work without tags. I'll have to touch the same
places to add MTE support, so it'll get done shortly.
r~
Richard Henderson (8):
target/arm: Replicate TBI/TBID bits for single range regimes
target/arm: Optimize cpu_mmu_index
target/arm: Apply TBI to ESR_ELx in helper_exception_return
target/arm: Move helper_dc_zva to helper-a64.c
target/arm: Use DEF_HELPER_FLAGS for helper_dc_zva
target/arm: Clean address for DC ZVA
target/arm: Check addresses for disabled regimes
target/arm: Disable clean_data_tbi for system mode
target/arm/cpu.h | 23 ++++----
target/arm/helper-a64.h | 1 +
target/arm/helper.h | 1 -
target/arm/helper-a64.c | 114 ++++++++++++++++++++++++++++++++++++-
target/arm/helper.c | 44 +++++++++++---
target/arm/op_helper.c | 93 ------------------------------
target/arm/translate-a64.c | 13 ++++-
7 files changed, 175 insertions(+), 114 deletions(-)
--
2.20.1
- [PATCH 0/8] target/arm: Misc cleanups surrounding TBI,
Richard Henderson <=
- [PATCH 1/8] target/arm: Replicate TBI/TBID bits for single range regimes, Richard Henderson, 2020/02/24
- [PATCH 2/8] target/arm: Optimize cpu_mmu_index, Richard Henderson, 2020/02/24
- [PATCH 3/8] target/arm: Apply TBI to ESR_ELx in helper_exception_return, Richard Henderson, 2020/02/24
- [PATCH 5/8] target/arm: Use DEF_HELPER_FLAGS for helper_dc_zva, Richard Henderson, 2020/02/24
- [PATCH 4/8] target/arm: Move helper_dc_zva to helper-a64.c, Richard Henderson, 2020/02/24
- [PATCH 6/8] target/arm: Clean address for DC ZVA, Richard Henderson, 2020/02/24
- [PATCH 7/8] target/arm: Check addresses for disabled regimes, Richard Henderson, 2020/02/24
- [PATCH 8/8] target/arm: Disable clean_data_tbi for system mode, Richard Henderson, 2020/02/24