Re: [PATCH v8 14/14] RISC-V: KVM: add support for SBI_FWFT_MISALIGNED_DELEG

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To: Clément Léger <cleger@xxxxxxxxxxxx>, "Paul Walmsley" <paul.walmsley@xxxxxxxxxx>, "Palmer Dabbelt" <palmer@xxxxxxxxxxx>, "Anup Patel" <anup@xxxxxxxxxxxxxx>, "Atish Patra" <atishp@xxxxxxxxxxxxxx>, "Shuah Khan" <shuah@xxxxxxxxxx>, "Jonathan Corbet" <corbet@xxxxxxx>, <linux-riscv@xxxxxxxxxxxxxxxxxxx>, <linux-kernel@xxxxxxxxxxxxxxx>, <linux-doc@xxxxxxxxxxxxxxx>, <kvm@xxxxxxxxxxxxxxx>, <kvm-riscv@xxxxxxxxxxxxxxxxxxx>, <linux-kselftest@xxxxxxxxxxxxxxx>
Subject: Re: [PATCH v8 14/14] RISC-V: KVM: add support for SBI_FWFT_MISALIGNED_DELEG
From: Radim Krčmář <rkrcmar@xxxxxxxxxxxxxxxx>
Date: Fri, 23 May 2025 15:08:04 +0200
Cc: "Samuel Holland" <samuel.holland@xxxxxxxxxx>, "Andrew Jones" <ajones@xxxxxxxxxxxxxxxx>, "Deepak Gupta" <debug@xxxxxxxxxxxx>, "Charlie Jenkins" <charlie@xxxxxxxxxxxx>, "Atish Patra" <atishp@xxxxxxxxxxxx>, "linux-riscv" <linux-riscv-bounces@xxxxxxxxxxxxxxxxxxx>
In-reply-to: <20250523101932.1594077-15-cleger@rivosinc.com>
References: <20250523101932.1594077-1-cleger@rivosinc.com> <20250523101932.1594077-15-cleger@rivosinc.com>

2025-05-23T12:19:31+02:00, Clément Léger <cleger@xxxxxxxxxxxx>:
> SBI_FWFT_MISALIGNED_DELEG needs hedeleg to be modified to delegate
> misaligned load/store exceptions. Save and restore it during CPU
> load/put.

How do you plan to access the value of hedeleg & MIS_DELEG from
userspace?

(I think that modeling medeleg in ONE_REG is a clean solution.)

Thanks.

References:
- [PATCH v8 00/14] riscv: add SBI FWFT misaligned exception delegation support
  - From: Clément Léger
- [PATCH v8 14/14] RISC-V: KVM: add support for SBI_FWFT_MISALIGNED_DELEG
  - From: Clément Léger

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