From: Thomas Gleixner <tglx@linutronix.de>
To: Nikolay Borisov <nik.borisov@suse.com>, x86@kernel.org
Cc: linux-kernel@vger.kernel.org, mhocko@suse.com, jslaby@suse.cz,
Nikolay Borisov <nik.borisov@suse.com>
Subject: Re: [PATCH v3 5/5] x86/entry: Make IA32 syscalls' availability depend on ia32_enabled()
Date: Sun, 18 Jun 2023 23:17:54 +0200 [thread overview]
Message-ID: <87mt0wqxkt.ffs@tglx> (raw)
In-Reply-To: <20230616125730.1164989-6-nik.borisov@suse.com>
On Fri, Jun 16 2023 at 15:57, Nikolay Borisov wrote:
> Another major aspect of supporting running of 32bit processes is the
> ability to access 32bit syscalls. Such syscalls are invoked either by
> using the legacy int 0x80 call gate interface or via the newer sysenter
> instruction.
>
> Ensure that if ia32 emulation is disabled (either at compile time or
> runtime) then those 2 syscall mechanisms are also disabled.
AFAICT there are _three_ mechanisms for 32bit syscalls, no?
> void __init idt_setup_traps(void)
> {
> idt_setup_from_table(idt_table, def_idts, ARRAY_SIZE(def_idts), true);
> +
> + if (ia32_enabled()) {
> + idt_setup_from_table(idt_table, ia32_idt, ARRAY_SIZE(ia32_idt),
> + true);
Just let it stick out. The 80 character limit is history.
Thanks,
tglx
next prev parent reply other threads:[~2023-06-18 21:18 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-16 12:57 [PATCH v3 0/5] Make IA32_EMULATION boot time overridable Nikolay Borisov
2023-06-16 12:57 ` [PATCH v3 1/5] x86: Make IA32_EMULATION boot time configurable Nikolay Borisov
2023-06-19 21:43 ` Randy Dunlap
2023-06-21 18:27 ` Borislav Petkov
2023-06-21 19:02 ` Nikolay Borisov
2023-06-16 12:57 ` [PATCH v3 2/5] x86/entry: Rename ignore_sysret Nikolay Borisov
2023-06-18 20:51 ` Thomas Gleixner
2023-06-19 13:30 ` Nikolay Borisov
2023-06-16 12:57 ` [PATCH v3 3/5] x86/entry: Compile entry_SYSCALL32_ignore unconditionally Nikolay Borisov
2023-06-18 21:11 ` Thomas Gleixner
2023-06-16 12:57 ` [PATCH v3 4/5] x86/elf: Make loading of 32bit processes depend on ia32_enabled() Nikolay Borisov
2023-06-16 12:57 ` [PATCH v3 5/5] x86/entry: Make IA32 syscalls' availability " Nikolay Borisov
2023-06-18 21:17 ` Thomas Gleixner [this message]
2023-06-19 6:28 ` Nikolay Borisov
2023-06-19 8:40 ` Thomas Gleixner
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