From: Thomas Gleixner <tglx@linutronix.de>
To: Andrew Cooper <andrew.cooper3@citrix.com>,
Nikolay Borisov <nik.borisov@suse.com>,
x86@kernel.org
Cc: linux-kernel@vger.kernel.org, mhocko@suse.com, jslaby@suse.cz
Subject: Re: [PATCH 3/3] x86: Disable running 32bit processes if ia32_disabled is passed
Date: Thu, 08 Jun 2023 17:56:19 +0200 [thread overview]
Message-ID: <87v8fyhrrw.ffs@tglx> (raw)
In-Reply-To: <455418fb-8050-3985-5c6c-8b2068702286@citrix.com>
On Thu, Jun 08 2023 at 12:25, Andrew Cooper wrote:
> On 08/06/2023 1:25 am, Thomas Gleixner wrote:
>> I really wish that we could disable syscall32 reliably on AMD and make
>> it raise #UD as it does on Intal.
>
> You know that's changing in FRED, and will follow the AMD model?
>
> The SYSCALL instruction is lower latency if it doesn't need to check %cs
> to conditionally #UD.
Yes, but with FRED the CPL0 context is fully consistent. There are no
CPL3 leftovers.
>> Didn't we assume that there are no CPU bugs? :)
>
> Tell me, is such a CPU delivered with or without a complimentary unicorn? :)
It's deliverd by a fairytale princess :)
Thanks,
tglx
next prev parent reply other threads:[~2023-06-08 15:56 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-07 7:29 [RFC PATCH 0/3] Add ability to disable ia32 at boot time Nikolay Borisov
2023-06-07 7:29 ` [PATCH 1/3] x86: Introduce ia32_disabled boot parameter Nikolay Borisov
2023-06-07 8:55 ` Thomas Gleixner
2023-06-07 7:29 ` [PATCH 2/3] x86/entry: Disable IA32 syscalls in the presence of ia32_disabled Nikolay Borisov
2023-06-07 9:11 ` Thomas Gleixner
2023-06-08 3:18 ` Brian Gerst
2023-06-07 7:29 ` [PATCH 3/3] x86: Disable running 32bit processes if ia32_disabled is passed Nikolay Borisov
2023-06-07 12:01 ` Thomas Gleixner
2023-06-07 12:19 ` Nikolay Borisov
2023-06-07 12:53 ` Thomas Gleixner
2023-06-07 13:38 ` Nikolay Borisov
2023-06-07 14:49 ` Thomas Gleixner
2023-06-07 17:25 ` Andrew Cooper
2023-06-07 21:52 ` Thomas Gleixner
2023-06-07 23:43 ` Andrew Cooper
2023-06-08 0:25 ` Thomas Gleixner
2023-06-08 6:16 ` Jiri Slaby
2023-06-08 6:36 ` Jiri Slaby
2023-06-08 15:30 ` Thomas Gleixner
2023-06-08 15:32 ` Andrew Cooper
2023-06-08 6:29 ` Jiri Slaby
2023-06-08 11:25 ` Andrew Cooper
2023-06-08 15:56 ` Thomas Gleixner [this message]
2023-06-08 21:29 ` Nikolay Borisov
2023-06-07 12:55 ` Thomas Gleixner
2023-06-08 4:37 ` Brian Gerst
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