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https://kernel.googlesource.com/pub/scm/linux/kernel/git/stable/linux-stable.git
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04304f5fe3
Commit f9af88a3d3 upstream.
It will be used by other x86 mitigations.
No functional changes.
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
51 lines
1.1 KiB
ArmAsm
51 lines
1.1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Common place for both 32- and 64-bit entry routines.
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*/
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#include <linux/linkage.h>
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#include <asm/export.h>
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#include <asm/msr-index.h>
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#include <asm/unwind_hints.h>
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#include <asm/segment.h>
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#include <asm/cache.h>
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#include <asm/cpufeatures.h>
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#include <asm/nospec-branch.h>
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.pushsection .noinstr.text, "ax"
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SYM_FUNC_START(entry_ibpb)
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movl $MSR_IA32_PRED_CMD, %ecx
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movl _ASM_RIP(x86_pred_cmd), %eax
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xorl %edx, %edx
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wrmsr
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/* Make sure IBPB clears return stack preductions too. */
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FILL_RETURN_BUFFER %rax, RSB_CLEAR_LOOPS, X86_BUG_IBPB_NO_RET
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RET
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SYM_FUNC_END(entry_ibpb)
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/* For KVM */
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EXPORT_SYMBOL_GPL(entry_ibpb);
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.popsection
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/*
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* Define the VERW operand that is disguised as entry code so that
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* it can be referenced with KPTI enabled. This ensures VERW can be
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* used late in exit-to-user path after page tables are switched.
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*/
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.pushsection .entry.text, "ax"
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.align L1_CACHE_BYTES, 0xcc
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SYM_CODE_START_NOALIGN(x86_verw_sel)
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UNWIND_HINT_EMPTY
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ANNOTATE_NOENDBR
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.word __KERNEL_DS
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.align L1_CACHE_BYTES, 0xcc
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SYM_CODE_END(x86_verw_sel);
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/* For KVM */
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EXPORT_SYMBOL_GPL(x86_verw_sel);
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.popsection
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