89 lines
2.8 KiB
C
Executable file
89 lines
2.8 KiB
C
Executable file
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ASM_X86_SPECCTRL_H_
|
|
#define _ASM_X86_SPECCTRL_H_
|
|
|
|
#include <linux/thread_info.h>
|
|
#include <asm/nospec-branch.h>
|
|
|
|
/*
|
|
* On VMENTER we must preserve whatever view of the SPEC_CTRL MSR
|
|
* the guest has, while on VMEXIT we restore the host view. This
|
|
* would be easier if SPEC_CTRL were architecturally maskable or
|
|
* shadowable for guests but this is not (currently) the case.
|
|
* Takes the guest view of SPEC_CTRL MSR as a parameter and also
|
|
* the guest's version of VIRT_SPEC_CTRL, if emulated.
|
|
*/
|
|
extern void x86_virt_spec_ctrl(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl, bool guest);
|
|
|
|
/**
|
|
* x86_spec_ctrl_set_guest - Set speculation control registers for the guest
|
|
* @guest_spec_ctrl: The guest content of MSR_SPEC_CTRL
|
|
* @guest_virt_spec_ctrl: The guest controlled bits of MSR_VIRT_SPEC_CTRL
|
|
* (may get translated to MSR_AMD64_LS_CFG bits)
|
|
*
|
|
* Avoids writing to the MSR if the content/bits are the same
|
|
*/
|
|
static inline
|
|
void x86_spec_ctrl_set_guest(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl)
|
|
{
|
|
x86_virt_spec_ctrl(guest_spec_ctrl, guest_virt_spec_ctrl, true);
|
|
}
|
|
|
|
/**
|
|
* x86_spec_ctrl_restore_host - Restore host speculation control registers
|
|
* @guest_spec_ctrl: The guest content of MSR_SPEC_CTRL
|
|
* @guest_virt_spec_ctrl: The guest controlled bits of MSR_VIRT_SPEC_CTRL
|
|
* (may get translated to MSR_AMD64_LS_CFG bits)
|
|
*
|
|
* Avoids writing to the MSR if the content/bits are the same
|
|
*/
|
|
static inline
|
|
void x86_spec_ctrl_restore_host(u64 guest_spec_ctrl, u64 guest_virt_spec_ctrl)
|
|
{
|
|
x86_virt_spec_ctrl(guest_spec_ctrl, guest_virt_spec_ctrl, false);
|
|
}
|
|
|
|
/* AMD specific Speculative Store Bypass MSR data */
|
|
extern u64 x86_amd_ls_cfg_base;
|
|
extern u64 x86_amd_ls_cfg_ssbd_mask;
|
|
|
|
static inline u64 ssbd_tif_to_spec_ctrl(u64 tifn)
|
|
{
|
|
BUILD_BUG_ON(TIF_SSBD < SPEC_CTRL_SSBD_SHIFT);
|
|
return (tifn & _TIF_SSBD) >> (TIF_SSBD - SPEC_CTRL_SSBD_SHIFT);
|
|
}
|
|
|
|
static inline u64 stibp_tif_to_spec_ctrl(u64 tifn)
|
|
{
|
|
BUILD_BUG_ON(TIF_SPEC_IB < SPEC_CTRL_STIBP_SHIFT);
|
|
return (tifn & _TIF_SPEC_IB) >> (TIF_SPEC_IB - SPEC_CTRL_STIBP_SHIFT);
|
|
}
|
|
|
|
static inline unsigned long ssbd_spec_ctrl_to_tif(u64 spec_ctrl)
|
|
{
|
|
BUILD_BUG_ON(TIF_SSBD < SPEC_CTRL_SSBD_SHIFT);
|
|
return (spec_ctrl & SPEC_CTRL_SSBD) << (TIF_SSBD - SPEC_CTRL_SSBD_SHIFT);
|
|
}
|
|
|
|
static inline unsigned long stibp_spec_ctrl_to_tif(u64 spec_ctrl)
|
|
{
|
|
BUILD_BUG_ON(TIF_SPEC_IB < SPEC_CTRL_STIBP_SHIFT);
|
|
return (spec_ctrl & SPEC_CTRL_STIBP) << (TIF_SPEC_IB - SPEC_CTRL_STIBP_SHIFT);
|
|
}
|
|
|
|
static inline u64 ssbd_tif_to_amd_ls_cfg(u64 tifn)
|
|
{
|
|
return (tifn & _TIF_SSBD) ? x86_amd_ls_cfg_ssbd_mask : 0ULL;
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
extern void speculative_store_bypass_ht_init(void);
|
|
#else
|
|
static inline void speculative_store_bypass_ht_init(void) { }
|
|
#endif
|
|
|
|
extern void speculation_ctrl_update(unsigned long tif);
|
|
extern void speculation_ctrl_update_current(void);
|
|
|
|
#endif
|