From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BBAC82D045; Mon, 11 Dec 2023 18:26:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="JHMDqXKK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3C574C433C7; Mon, 11 Dec 2023 18:26:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1702319195; bh=uDrh/X8w4Ss8VrQkKSaelD+IR4bFZT/gh+rgtYKGsNM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JHMDqXKKeC4uyR49YjLRpeGeTJE6oHzbkMOcuYyXiFSKzUJbV476LB8vW67niB4TF YecmuK6HHAndlpeZoP95Ei7c2jGM7wAQM1SP8LKuvUIAhyo6EbcKymH1I7SzXop/gF BN3WUSJJYyvyU/ed6lYqWg5t3F01+wLA3tPsJKtc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Nikolay Borisov , Thomas Gleixner Subject: [PATCH 6.6 017/244] x86: Introduce ia32_enabled() Date: Mon, 11 Dec 2023 19:18:30 +0100 Message-ID: <20231211182046.553879964@linuxfoundation.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20231211182045.784881756@linuxfoundation.org> References: <20231211182045.784881756@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Nikolay Borisov [ upstream commit 1da5c9bc119d3a749b519596b93f9b2667e93c4a ] IA32 support on 64bit kernels depends on whether CONFIG_IA32_EMULATION is selected or not. As it is a compile time option it doesn't provide the flexibility to have distributions set their own policy for IA32 support and give the user the flexibility to override it. As a first step introduce ia32_enabled() which abstracts whether IA32 compat is turned on or off. Upcoming patches will implement the ability to set IA32 compat state at boot time. Signed-off-by: Nikolay Borisov Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/r/20230623111409.3047467-2-nik.borisov@suse.com Signed-off-by: Greg Kroah-Hartman --- arch/x86/entry/common.c | 4 ++++ arch/x86/include/asm/ia32.h | 16 +++++++++++++++- 2 files changed, 19 insertions(+), 1 deletion(-) --- a/arch/x86/entry/common.c +++ b/arch/x86/entry/common.c @@ -96,6 +96,10 @@ static __always_inline int syscall_32_en return (int)regs->orig_ax; } +#ifdef CONFIG_IA32_EMULATION +bool __ia32_enabled __ro_after_init = true; +#endif + /* * Invoke a 32-bit syscall. Called with IRQs on in CONTEXT_KERNEL. */ --- a/arch/x86/include/asm/ia32.h +++ b/arch/x86/include/asm/ia32.h @@ -68,6 +68,20 @@ extern void ia32_pick_mmap_layout(struct #endif -#endif /* CONFIG_IA32_EMULATION */ +extern bool __ia32_enabled; + +static inline bool ia32_enabled(void) +{ + return __ia32_enabled; +} + +#else /* !CONFIG_IA32_EMULATION */ + +static inline bool ia32_enabled(void) +{ + return IS_ENABLED(CONFIG_X86_32); +} + +#endif #endif /* _ASM_X86_IA32_H */