| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * Common place for both 32- and 64-bit entry routines. |
| */ |
| |
| #include <linux/export.h> |
| #include <linux/linkage.h> |
| #include <asm/msr-index.h> |
| #include <asm/unwind_hints.h> |
| #include <asm/segment.h> |
| #include <asm/cache.h> |
| #include <asm/cpufeatures.h> |
| #include <asm/nospec-branch.h> |
| |
| #include "calling.h" |
| |
| .pushsection .noinstr.text, "ax" |
| |
| SYM_FUNC_START(entry_ibpb) |
| movl $MSR_IA32_PRED_CMD, %ecx |
| movl $PRED_CMD_IBPB, %eax |
| xorl %edx, %edx |
| wrmsr |
| |
| /* Make sure IBPB clears return stack preductions too. */ |
| FILL_RETURN_BUFFER %rax, RSB_CLEAR_LOOPS, X86_BUG_IBPB_NO_RET |
| RET |
| SYM_FUNC_END(entry_ibpb) |
| /* For KVM */ |
| EXPORT_SYMBOL_GPL(entry_ibpb); |
| |
| .popsection |
| |
| /* |
| * Define the VERW operand that is disguised as entry code so that |
| * it can be referenced with KPTI enabled. This ensure VERW can be |
| * used late in exit-to-user path after page tables are switched. |
| */ |
| .pushsection .entry.text, "ax" |
| |
| .align L1_CACHE_BYTES, 0xcc |
| SYM_CODE_START_NOALIGN(mds_verw_sel) |
| UNWIND_HINT_UNDEFINED |
| ANNOTATE_NOENDBR |
| .word __KERNEL_DS |
| .align L1_CACHE_BYTES, 0xcc |
| SYM_CODE_END(mds_verw_sel); |
| /* For KVM */ |
| EXPORT_SYMBOL_GPL(mds_verw_sel); |
| |
| .popsection |
| |
| THUNK warn_thunk_thunk, __warn_thunk |
