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Re: [PATCH v3 12/21] linux-user/aarch64: Implement PR_TAGGED_ADDR_ENABLE
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From: |
Peter Maydell |
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Subject: |
Re: [PATCH v3 12/21] linux-user/aarch64: Implement PR_TAGGED_ADDR_ENABLE |
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Date: |
Fri, 22 Jan 2021 12:02:07 +0000 |
On Fri, 22 Jan 2021 at 11:53, Peter Maydell <peter.maydell@linaro.org> wrote:
> The kernel's "untagged_addr()" implementation:
> https://elixir.bootlin.com/linux/latest/source/arch/arm64/include/asm/memory.h#L203
> slightly confusingly does "untag the addr if it's in the userspace
> half, leave the tag bits alone if in the kernel half".
...and a kernel person has just explained to me the rationale:
TBI is always enabled for userspace and never for the kernel,
so "always clear tag bits for a userspace address, never clear
them for a kernel address" is the right behaviour. I think we
should have the same logic.
-- PMM
- [PATCH v3 07/21] linux-user: Tidy VERIFY_READ/VERIFY_WRITE, (continued)
- [PATCH v3 07/21] linux-user: Tidy VERIFY_READ/VERIFY_WRITE, Richard Henderson, 2021/01/15
- [PATCH v3 09/21] linux-user: Do not use guest_addr_valid for h2g_valid, Richard Henderson, 2021/01/15
- [PATCH v3 06/21] linux-user: Check for overflow in access_ok, Richard Henderson, 2021/01/15
- [PATCH v3 11/21] exec: Add support for TARGET_TAGGED_ADDRESSES, Richard Henderson, 2021/01/15
- [PATCH v3 12/21] linux-user/aarch64: Implement PR_TAGGED_ADDR_ENABLE, Richard Henderson, 2021/01/15
- [PATCH v3 15/21] target/arm: Split out syndrome.h from internals.h, Richard Henderson, 2021/01/15
- [PATCH v3 17/21] linux-user/aarch64: Signal SEGV_MTESERR for sync tag check fault, Richard Henderson, 2021/01/15
- [PATCH v3 14/21] linux-user/aarch64: Implement PROT_MTE, Richard Henderson, 2021/01/15
- [PATCH v3 16/21] linux-user/aarch64: Pass syndrome to EXC_*_ABORT, Richard Henderson, 2021/01/15
- [PATCH v3 13/21] linux-user/aarch64: Implement PR_MTE_TCF and PR_MTE_TAG, Richard Henderson, 2021/01/15
- [PATCH v3 19/21] target/arm: Add allocation tag storage for user mode, Richard Henderson, 2021/01/15