1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Common place for both 32- and 64-bit entry
4 */
5
6 #include <linux/export.h>
7 #include <linux/linkage.h>
8 #include <asm/msr-index.h>
9 #include <asm/unwind_hints.h>
10 #include <asm/segment.h>
11 #include <asm/cache.h>
12 #include <asm/cpufeatures.h>
13 #include <asm/nospec-branch.h>
14
15 #include "calling.h"
16
17 .pushsection .noinstr.text, "ax"
18
19 SYM_FUNC_START(entry_ibpb)
20 movl $MSR_IA32_PRED_CMD, %ecx
21 movl $PRED_CMD_IBPB, %eax
22 xorl %edx, %edx
23 wrmsr
24
25 /* Make sure IBPB clears return stack
26 FILL_RETURN_BUFFER %rax, RSB_CLEAR_LOO
27 RET
28 SYM_FUNC_END(entry_ibpb)
29 /* For KVM */
30 EXPORT_SYMBOL_GPL(entry_ibpb);
31
32 .popsection
33
34 /*
35 * Define the VERW operand that is disguised a
36 * it can be referenced with KPTI enabled. Thi
37 * used late in exit-to-user path after page t
38 */
39 .pushsection .entry.text, "ax"
40
41 .align L1_CACHE_BYTES, 0xcc
42 SYM_CODE_START_NOALIGN(mds_verw_sel)
43 UNWIND_HINT_UNDEFINED
44 ANNOTATE_NOENDBR
45 .word __KERNEL_DS
46 .align L1_CACHE_BYTES, 0xcc
47 SYM_CODE_END(mds_verw_sel);
48 /* For KVM */
49 EXPORT_SYMBOL_GPL(mds_verw_sel);
50
51 .popsection
52
53 THUNK warn_thunk_thunk, __warn_thunk
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