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1 : : /* SPDX-License-Identifier: GPL-2.0 */ 2 : : #ifndef _ASM_X86_SPECCTRL_H_ 3 : : #define _ASM_X86_SPECCTRL_H_ 4 : : 5 : : #include <linux/thread_info.h> 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. 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. 15 : : */ 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 : : } 45 : : 46 : : /* AMD specific Speculative Store Bypass MSR data */ 47 : : extern u64 x86_amd_ls_cfg_base; 48 : : extern u64 x86_amd_ls_cfg_ssbd_mask; 49 : : 50 : 0 : static inline u64 ssbd_tif_to_spec_ctrl(u64 tifn) 51 : : { 52 : 0 : BUILD_BUG_ON(TIF_SSBD < SPEC_CTRL_SSBD_SHIFT); 53 : 0 : return (tifn & _TIF_SSBD) >> (TIF_SSBD - SPEC_CTRL_SSBD_SHIFT); 54 : : } 55 : : 56 : 0 : static inline u64 stibp_tif_to_spec_ctrl(u64 tifn) 57 : : { 58 : 0 : BUILD_BUG_ON(TIF_SPEC_IB < SPEC_CTRL_STIBP_SHIFT); 59 : 0 : return (tifn & _TIF_SPEC_IB) >> (TIF_SPEC_IB - SPEC_CTRL_STIBP_SHIFT); 60 : : } 61 : : 62 : 0 : static inline unsigned long ssbd_spec_ctrl_to_tif(u64 spec_ctrl) 63 : : { 64 : 0 : BUILD_BUG_ON(TIF_SSBD < SPEC_CTRL_SSBD_SHIFT); 65 : 0 : return (spec_ctrl & SPEC_CTRL_SSBD) << (TIF_SSBD - SPEC_CTRL_SSBD_SHIFT); 66 : : } 67 : : 68 : : static inline unsigned long stibp_spec_ctrl_to_tif(u64 spec_ctrl) 69 : : { 70 : : BUILD_BUG_ON(TIF_SPEC_IB < SPEC_CTRL_STIBP_SHIFT); 71 : : return (spec_ctrl & SPEC_CTRL_STIBP) << (TIF_SPEC_IB - SPEC_CTRL_STIBP_SHIFT); 72 : : } 73 : : 74 : 0 : static inline u64 ssbd_tif_to_amd_ls_cfg(u64 tifn) 75 : : { 76 [ - - - - : 0 : return (tifn & _TIF_SSBD) ? x86_amd_ls_cfg_ssbd_mask : 0ULL; - - ] 77 : : } 78 : : 79 : : #ifdef CONFIG_SMP 80 : : extern void speculative_store_bypass_ht_init(void); 81 : : #else 82 : : static inline void speculative_store_bypass_ht_init(void) { } 83 : : #endif 84 : : 85 : : extern void speculation_ctrl_update(unsigned long tif); 86 : : extern void speculation_ctrl_update_current(void); 87 : : 88 : : #endif