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| author | Thomas Gleixner <tglx@linutronix.de> | 2020-05-12 14:54:14 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-06-11 15:14:42 +0200 |
| commit | c9317202af70ee03d44fdd68abebdb640b8ab411 (patch) | |
| tree | 2b2662937525fc5c8161dab79ce0706f28018715 /arch | |
| parent | 410367e321b5cbd4a616161142a7d162cf55885e (diff) | |
| download | driver-core-c9317202af70ee03d44fdd68abebdb640b8ab411.tar.gz | |
x86/entry/64: Use native swapgs in asm_load_gs_index()
When PARAVIRT_XXL is in use, then load_gs_index() uses xen_load_gs_index()
and asm_load_gs_index() is unused.
It's therefore pointless to use the paravirtualized SWAPGS implementation
in asm_load_gs_index(). Switch it to a plain swapgs.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Acked-by: Juergen Gross <jgross@suse.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200512213809.583980272@linutronix.de
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/entry/entry_64.S | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index be8ed3a84cafa2..9747b42fedd559 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -1043,11 +1043,11 @@ idtentry simd_coprocessor_error do_simd_coprocessor_error has_error_code=0 */ SYM_FUNC_START(asm_load_gs_index) FRAME_BEGIN - SWAPGS + swapgs .Lgs_change: movl %edi, %gs 2: ALTERNATIVE "", "mfence", X86_BUG_SWAPGS_FENCE - SWAPGS + swapgs FRAME_END ret SYM_FUNC_END(asm_load_gs_index) @@ -1057,7 +1057,7 @@ EXPORT_SYMBOL(asm_load_gs_index) .section .fixup, "ax" /* running with kernelgs */ SYM_CODE_START_LOCAL_NOALIGN(.Lbad_gs) - SWAPGS /* switch back to user gs */ + swapgs /* switch back to user gs */ .macro ZAP_GS /* This can't be a string because the preprocessor needs to see it. */ movl $__USER_DS, %eax |