linux-kernel - Re: [PATCH RFC v2 25/29] mm: asi: Restricted execution fore bare-metal processes

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Message-ID: <D8L7S0DIVJ9K.1DJSDD0RIJAEV@google.com>
Date: Thu, 20 Mar 2025 15:55:19 +0000
From: Brendan Jackman <jackmanb@...gle.com>
To: Brendan Jackman <jackmanb@...gle.com>
Cc: <x86@...nel.org>, <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
Subject: Re: [PATCH RFC v2 25/29] mm: asi: Restricted execution fore
 bare-metal processes

On Fri Jan 10, 2025 at 6:40 PM UTC, Brendan Jackman wrote:
>  noinstr void irqentry_enter_from_user_mode(struct pt_regs *regs)
> diff --git a/kernel/fork.c b/kernel/fork.c
> index bb73758790d08112265d398b16902ff9a4c2b8fe..54068d2415939b92409ca8a45111176783c6acbd 100644
> --- a/kernel/fork.c
> +++ b/kernel/fork.c
> @@ -917,6 +917,7 @@ void __mmdrop(struct mm_struct *mm)
>  	/* Ensure no CPUs are using this as their lazy tlb mm */
>  	cleanup_lazy_tlbs(mm);
>  
> +	asi_destroy_userspace(mm);

We can't do this here, it takes a mutex.

The lifecycle of struct asi needs to be reworked anyway as Yosry discussed here:

https://lore.kernel.org/linux-kernel/Z9sRQ0cK0rupEiT-@google.com/