From: "Björn Töpel" <bjorn@kernel.org>
To: Vineet Gupta <vineetg@rivosinc.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
linux-riscv@lists.infradead.org
Cc: "Björn Töpel" <bjorn@rivosinc.com>,
linux-kernel@vger.kernel.org, linux@rivosinc.com,
"Palmer Dabbelt" <palmer@rivosinc.com>,
"Rémi Denis-Courmont" <remi@remlab.net>,
"Darius Rad" <darius@bluespec.com>,
"Andy Chiu" <andy.chiu@sifive.com>
Subject: Re: [PATCH] riscv: Discard vector state on syscalls
Date: Mon, 26 Jun 2023 17:46:57 +0200 [thread overview]
Message-ID: <874jmuns3y.fsf@all.your.base.are.belong.to.us> (raw)
In-Reply-To: <b990638b-a86a-ee43-f8b1-18a0a0651ad0@rivosinc.com>
Vineet Gupta <vineetg@rivosinc.com> writes:
> On 6/22/23 10:36, Björn Töpel wrote:
>> From: Björn Töpel <bjorn@rivosinc.com>
>>
>> The RISC-V vector specification states:
>> Executing a system call causes all caller-saved vector registers
>> (v0-v31, vl, vtype) and vstart to become unspecified.
>
> So the only use case of saving/restoring V regs in __switch_to is an
> interrupt induced task switch ?
Yes!
prev parent reply other threads:[~2023-06-26 15:47 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-22 17:36 Björn Töpel
2023-06-22 17:46 ` Palmer Dabbelt
2023-06-22 17:55 ` Darius Rad
2023-06-22 18:02 ` Palmer Dabbelt
2023-06-22 18:28 ` Vineet Gupta
2023-06-26 15:46 ` Björn Töpel [this message]
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