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Date: Tue, 26 Oct 2021 22:30:03 +0800 From: Lai Jiangshan <jiangshanlai@...il.com> To: linux-kernel@...r.kernel.org Cc: x86@...nel.org, Lai Jiangshan <laijs@...ux.alibaba.com>, Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, "H. Peter Anvin" <hpa@...or.com> Subject: [PATCH V4 21/50] x86/entry: Move cld to the start of idtentry From: Lai Jiangshan <laijs@...ux.alibaba.com> Make it next to CLAC Suggested-by: Peter Zijlstra <peterz@...radead.org> Signed-off-by: Lai Jiangshan <laijs@...ux.alibaba.com> --- arch/x86/entry/entry_64.S | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index 1ec87d9e685d..52a08c4a0171 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -357,6 +357,7 @@ SYM_CODE_END(ret_from_fork) SYM_CODE_START(\asmsym) UNWIND_HINT_IRET_REGS offset=\has_error_code*8 ASM_CLAC + cld .if \has_error_code == 0 pushq $-1 /* ORIG_RAX: no syscall to restart */ @@ -424,6 +425,7 @@ SYM_CODE_END(\asmsym) SYM_CODE_START(\asmsym) UNWIND_HINT_IRET_REGS ASM_CLAC + cld pushq $-1 /* ORIG_RAX: no syscall to restart */ @@ -479,6 +481,7 @@ SYM_CODE_END(\asmsym) SYM_CODE_START(\asmsym) UNWIND_HINT_IRET_REGS ASM_CLAC + cld /* * If the entry is from userspace, switch stacks and treat it as @@ -540,6 +543,7 @@ SYM_CODE_END(\asmsym) SYM_CODE_START(\asmsym) UNWIND_HINT_IRET_REGS offset=8 ASM_CLAC + cld /* paranoid_entry returns GS information for paranoid_exit in EBX. */ call paranoid_entry @@ -852,7 +856,6 @@ SYM_CODE_END(xen_failsafe_callback) */ SYM_CODE_START_LOCAL(paranoid_entry) UNWIND_HINT_FUNC - cld PUSH_AND_CLEAR_REGS save_ret=1 ENCODE_FRAME_POINTER 8 @@ -977,7 +980,6 @@ SYM_CODE_END(paranoid_exit) */ SYM_CODE_START_LOCAL(error_entry) UNWIND_HINT_FUNC - cld testb $3, CS+8(%rsp) jz .Lerror_kernelspace @@ -1112,6 +1114,7 @@ SYM_CODE_START(asm_exc_nmi) */ ASM_CLAC + cld /* Use %rdx as our temp variable throughout */ pushq %rdx @@ -1131,7 +1134,6 @@ SYM_CODE_START(asm_exc_nmi) */ swapgs - cld FENCE_SWAPGS_USER_ENTRY SWITCH_TO_KERNEL_CR3 scratch_reg=%rdx movq %rsp, %rdx -- 2.19.1.6.gb485710b
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