From: Peter Zijlstra <peterz@infradead.org>
To: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: linux-kernel@vger.kernel.org,
Lai Jiangshan <laijs@linux.alibaba.com>,
Andy Lutomirski <luto@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH 05/24] x86/entry: Introduce __entry_text for entry code written in C
Date: Tue, 31 Aug 2021 21:34:30 +0200 [thread overview]
Message-ID: <20210831193430.GL4353@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <20210831175025.27570-6-jiangshanlai@gmail.com>
On Wed, Sep 01, 2021 at 01:50:06AM +0800, Lai Jiangshan wrote:
> From: Lai Jiangshan <laijs@linux.alibaba.com>
>
> Some entry code will be implemented in traps.c. We need __entry_text
> to set them in .entry.text section.
>
> Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
> ---
> arch/x86/entry/traps.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/arch/x86/entry/traps.c b/arch/x86/entry/traps.c
> index f71db7934f90..ef07ae5fb3a0 100644
> --- a/arch/x86/entry/traps.c
> +++ b/arch/x86/entry/traps.c
> @@ -69,6 +69,11 @@
> extern unsigned char native_irq_return_iret[];
> extern unsigned char asm_load_gs_index_gs_change[];
>
> +/* Entry code written in C. Must be only used in traps.c */
> +#define __entry_text \
> + noinline notrace __attribute((__section__(".entry.text"))) \
> + __no_kcsan __no_sanitize_address __no_profile __no_sanitize_coverage
Urgh, that's bound to get out of sync with noinstr.. How about you make
noinstr something like:
#define __noinstr_section(section) \
noinline notrace __attribute((__section__(section))) \
__no_kcsan __no_sanitize_address __no_profile __no_sanitize_coverage
#define noinstr __noinstr_section(".noinstr.text")
and then write the above like:
#define __entry_text __noinstr_section(".entry.text")
next prev parent reply other threads:[~2021-08-31 19:36 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-31 17:50 [PATCH 00/24] x86/entry/64: Convert a bunch of ASM entry code into C code Lai Jiangshan
2021-08-31 17:50 ` [PATCH 01/24] x86/traps: Remove stack-protector from traps.c Lai Jiangshan
2021-08-31 17:50 ` [PATCH 02/24] x86/traps: Move arch/x86/kernel/traps.c to arch/x86/entry/ Lai Jiangshan
2021-09-02 8:09 ` Joerg Roedel
2021-09-02 9:21 ` Lai Jiangshan
2021-09-02 10:50 ` Peter Zijlstra
2021-09-02 11:54 ` Lai Jiangshan
2021-09-02 12:05 ` Peter Zijlstra
2021-09-02 13:34 ` Peter Zijlstra
2021-09-02 17:05 ` Nick Desaulniers
2021-09-02 17:19 ` Miguel Ojeda
2021-09-02 17:23 ` Nick Desaulniers
2021-09-03 7:36 ` Martin Liška
2021-09-07 21:12 ` Nick Desaulniers
2021-09-08 7:33 ` Martin Liška
2021-08-31 17:50 ` [PATCH 03/24] x86/traps: Move declaration of native_irq_return_iret up Lai Jiangshan
2021-08-31 17:50 ` [PATCH 04/24] x86/entry: Expose the address of .Lgs_change to traps.c Lai Jiangshan
2021-09-02 9:14 ` Peter Zijlstra
2021-09-02 9:20 ` Lai Jiangshan
2021-08-31 17:50 ` [PATCH 05/24] x86/entry: Introduce __entry_text for entry code written in C Lai Jiangshan
2021-08-31 19:34 ` Peter Zijlstra [this message]
2021-09-01 0:23 ` Lai Jiangshan
2021-08-31 17:50 ` [PATCH 06/24] x86/entry: Move PTI_USER_* to arch/x86/include/asm/processor-flags.h Lai Jiangshan
2021-08-31 17:50 ` [PATCH 07/24] x86: Mark __native_read_cr3() & native_write_cr3() as __always_inline Lai Jiangshan
2021-08-31 17:50 ` [PATCH 08/24] x86/traps: Add C verion of SWITCH_TO_KERNEL_CR3 as switch_to_kernel_cr3() Lai Jiangshan
2021-08-31 17:50 ` [PATCH 09/24] x86/traps: Add fence_swapgs_{user,kernel}_entry() Lai Jiangshan
2021-09-02 9:25 ` Peter Zijlstra
2021-08-31 17:50 ` [PATCH 10/24] x86/traps: Move pt_regs only in fixup_bad_iret() Lai Jiangshan
2021-08-31 17:50 ` [PATCH 11/24] x86/entry: Replace the most of asm code of error_entry to C code Lai Jiangshan
2021-09-02 10:16 ` Peter Zijlstra
2021-09-02 12:08 ` Lai Jiangshan
2021-08-31 17:50 ` [PATCH 12/24] x86/traps: Reconstruct pt_regs on task stack directly in fixup_bad_iret() Lai Jiangshan
2021-08-31 17:50 ` [PATCH 13/24] x86/traps: Mark sync_regs() and fixup_bad_iret() as static __always_inline Lai Jiangshan
2021-08-31 17:50 ` [PATCH 14/24] x86/entry: Make paranoid_exit() callable Lai Jiangshan
2021-08-31 17:50 ` [PATCH 15/24] x86/entry: Call paranoid_exit() in asm_exc_nmi() Lai Jiangshan
2021-08-31 17:50 ` [PATCH 16/24] x86/entry: Use skip_rdi instead of save_ret for PUSH_AND_CLEAR_REGS Lai Jiangshan
2021-08-31 17:50 ` [PATCH 17/24] x86/entry: Introduce struct ist_regs Lai Jiangshan
2021-09-10 0:18 ` Lai Jiangshan
2021-09-10 0:36 ` Lai Jiangshan
2021-09-10 4:31 ` H. Peter Anvin
2021-09-10 7:13 ` Lai Jiangshan
2021-09-10 7:14 ` H. Peter Anvin
2021-09-10 4:50 ` H. Peter Anvin
2021-09-10 4:51 ` H. Peter Anvin
2021-08-31 17:50 ` [PATCH 18/24] x86/entry: Add the C version ist_switch_to_kernel_cr3() Lai Jiangshan
2021-08-31 17:50 ` [PATCH 19/24] x86/entry: Add the C version ist_restore_cr3() Lai Jiangshan
2021-08-31 17:50 ` [PATCH 20/24] x86/entry: Add the C version get_percpu_base() Lai Jiangshan
2021-08-31 17:50 ` [PATCH 21/24] x86/entry: Add the C version ist_switch_to_kernel_gsbase() Lai Jiangshan
2021-08-31 17:50 ` [PATCH 22/24] x86/entry: Implement and use do_paranoid_entry() and paranoid_exit() Lai Jiangshan
2021-09-02 10:33 ` Peter Zijlstra
2021-09-02 10:42 ` Lai Jiangshan
2021-09-02 12:02 ` Peter Zijlstra
2021-09-02 11:58 ` Lai Jiangshan
2021-09-02 12:29 ` Joerg Roedel
2021-08-31 17:50 ` [PATCH 23/24] x86/entry: Remove the unused ASM macros Lai Jiangshan
2021-08-31 17:50 ` [PATCH 24/24] x86/syscall/64: Move the checking for sysret to C code Lai Jiangshan
2021-09-10 7:20 ` Nikolay Borisov
2021-09-10 7:30 ` Lai Jiangshan
2021-08-31 20:44 ` [PATCH 00/24] x86/entry/64: Convert a bunch of ASM entry code into " Peter Zijlstra
2021-09-02 6:28 ` Lai Jiangshan
2021-09-02 7:44 ` Peter Zijlstra
2021-09-02 10:50 ` [PATCH 25/24] x86/traps: Rewrite native_load_gs_index in " Lai Jiangshan
2021-09-08 1:38 ` H. Peter Anvin
2021-09-08 4:42 ` H. Peter Anvin
2021-09-08 5:00 ` H. Peter Anvin
2021-09-08 7:12 ` Lai Jiangshan
2021-09-09 23:16 ` H. Peter Anvin
2021-09-13 20:01 ` Andy Lutomirski
2021-09-14 2:04 ` Lai Jiangshan
2021-09-14 8:14 ` Peter Zijlstra
2021-09-14 8:17 ` Borislav Petkov
2021-09-14 8:40 ` Lai Jiangshan
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