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/* 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.
*/
extern void x86_spec_ctrl_set_guest(u64);
extern void x86_spec_ctrl_restore_host(u64);
/* AMD specific Speculative Store Bypass MSR data */
extern u64 x86_amd_ls_cfg_base;
extern u64 x86_amd_ls_cfg_rds_mask;
/* The Intel SPEC CTRL MSR base value cache */
extern u64 x86_spec_ctrl_base;
static inline u64 rds_tif_to_spec_ctrl(u64 tifn)
{
BUILD_BUG_ON(TIF_RDS < SPEC_CTRL_RDS_SHIFT);
return (tifn & _TIF_RDS) >> (TIF_RDS - SPEC_CTRL_RDS_SHIFT);
}
static inline u64 rds_tif_to_amd_ls_cfg(u64 tifn)
{
return (tifn & _TIF_RDS) ? x86_amd_ls_cfg_rds_mask : 0ULL;
}
extern void speculative_store_bypass_update(void);
#endif
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