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28a27752 TG |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | #ifndef _ASM_X86_SPECCTRL_H_ | |
3 | #define _ASM_X86_SPECCTRL_H_ | |
4 | ||
885f82bf | 5 | #include <linux/thread_info.h> |
28a27752 TG |
6 | #include <asm/nospec-branch.h> |
7 | ||
8 | /* | |
9 | * On VMENTER we must preserve whatever view of the SPEC_CTRL MSR | |
10 | * the guest has, while on VMEXIT we restore the host view. This | |
11 | * would be easier if SPEC_CTRL were architecturally maskable or | |
12 | * shadowable for guests but this is not (currently) the case. | |
ccbcd267 TG |
13 | * Takes the guest view of SPEC_CTRL MSR as a parameter and also |
14 | * the guest's version of VIRT_SPEC_CTRL, if emulated. | |
28a27752 | 15 | */ |
cc69b349 BP |
16 | extern void x86_virt_spec_ctrl(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl, bool guest); |
17 | ||
18 | /** | |
19 | * x86_spec_ctrl_set_guest - Set speculation control registers for the guest | |
20 | * @guest_spec_ctrl: The guest content of MSR_SPEC_CTRL | |
21 | * @guest_virt_spec_ctrl: The guest controlled bits of MSR_VIRT_SPEC_CTRL | |
22 | * (may get translated to MSR_AMD64_LS_CFG bits) | |
23 | * | |
24 | * Avoids writing to the MSR if the content/bits are the same | |
25 | */ | |
26 | static inline | |
27 | void x86_spec_ctrl_set_guest(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl) | |
28 | { | |
29 | x86_virt_spec_ctrl(guest_spec_ctrl, guest_virt_spec_ctrl, true); | |
30 | } | |
31 | ||
32 | /** | |
33 | * x86_spec_ctrl_restore_host - Restore host speculation control registers | |
34 | * @guest_spec_ctrl: The guest content of MSR_SPEC_CTRL | |
35 | * @guest_virt_spec_ctrl: The guest controlled bits of MSR_VIRT_SPEC_CTRL | |
36 | * (may get translated to MSR_AMD64_LS_CFG bits) | |
37 | * | |
38 | * Avoids writing to the MSR if the content/bits are the same | |
39 | */ | |
40 | static inline | |
41 | void x86_spec_ctrl_restore_host(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl) | |
42 | { | |
43 | x86_virt_spec_ctrl(guest_spec_ctrl, guest_virt_spec_ctrl, false); | |
44 | } | |
28a27752 TG |
45 | |
46 | /* AMD specific Speculative Store Bypass MSR data */ | |
47 | extern u64 x86_amd_ls_cfg_base; | |
9f65fb29 | 48 | extern u64 x86_amd_ls_cfg_ssbd_mask; |
28a27752 | 49 | |
9f65fb29 | 50 | static inline u64 ssbd_tif_to_spec_ctrl(u64 tifn) |
885f82bf | 51 | { |
9f65fb29 KRW |
52 | BUILD_BUG_ON(TIF_SSBD < SPEC_CTRL_SSBD_SHIFT); |
53 | return (tifn & _TIF_SSBD) >> (TIF_SSBD - SPEC_CTRL_SSBD_SHIFT); | |
885f82bf TG |
54 | } |
55 | ||
9f65fb29 | 56 | static inline u64 ssbd_tif_to_amd_ls_cfg(u64 tifn) |
885f82bf | 57 | { |
9f65fb29 | 58 | return (tifn & _TIF_SSBD) ? x86_amd_ls_cfg_ssbd_mask : 0ULL; |
885f82bf TG |
59 | } |
60 | ||
1f50ddb4 TG |
61 | #ifdef CONFIG_SMP |
62 | extern void speculative_store_bypass_ht_init(void); | |
63 | #else | |
64 | static inline void speculative_store_bypass_ht_init(void) { } | |
65 | #endif | |
66 | ||
0270be3e TG |
67 | extern void speculative_store_bypass_update(unsigned long tif); |
68 | ||
69 | static inline void speculative_store_bypass_update_current(void) | |
70 | { | |
71 | speculative_store_bypass_update(current_thread_info()->flags); | |
72 | } | |
885f82bf | 73 | |
28a27752 | 74 | #endif |