400331f8ff
A microcode update on some Intel processors causes all TSX transactions to always abort by default[*]. Microcode also added functionality to re-enable TSX for development purposes. With this microcode loaded, if tsx=on was passed on the cmdline, and TSX development mode was already enabled before the kernel boot, it may make the system vulnerable to TSX Asynchronous Abort (TAA). To be on safer side, unconditionally disable TSX development mode during boot. If a viable use case appears, this can be revisited later. [*]: Intel TSX Disable Update for Selected Processors, doc ID: 643557 [ bp: Drop unstable web link, massage heavily. ] Suggested-by: Andrew Cooper <andrew.cooper3@citrix.com> Suggested-by: Borislav Petkov <bp@alien8.de> Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Tested-by: Neelima Krishnan <neelima.krishnan@intel.com> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/347bd844da3a333a9793c6687d4e4eb3b2419a3e.1646943780.git.pawan.kumar.gupta@linux.intel.com
87 lines
2.5 KiB
C
87 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef ARCH_X86_CPU_H
|
|
#define ARCH_X86_CPU_H
|
|
|
|
/* attempt to consolidate cpu attributes */
|
|
struct cpu_dev {
|
|
const char *c_vendor;
|
|
|
|
/* some have two possibilities for cpuid string */
|
|
const char *c_ident[2];
|
|
|
|
void (*c_early_init)(struct cpuinfo_x86 *);
|
|
void (*c_bsp_init)(struct cpuinfo_x86 *);
|
|
void (*c_init)(struct cpuinfo_x86 *);
|
|
void (*c_identify)(struct cpuinfo_x86 *);
|
|
void (*c_detect_tlb)(struct cpuinfo_x86 *);
|
|
int c_x86_vendor;
|
|
#ifdef CONFIG_X86_32
|
|
/* Optional vendor specific routine to obtain the cache size. */
|
|
unsigned int (*legacy_cache_size)(struct cpuinfo_x86 *,
|
|
unsigned int);
|
|
|
|
/* Family/stepping-based lookup table for model names. */
|
|
struct legacy_cpu_model_info {
|
|
int family;
|
|
const char *model_names[16];
|
|
} legacy_models[5];
|
|
#endif
|
|
};
|
|
|
|
struct _tlb_table {
|
|
unsigned char descriptor;
|
|
char tlb_type;
|
|
unsigned int entries;
|
|
/* unsigned int ways; */
|
|
char info[128];
|
|
};
|
|
|
|
#define cpu_dev_register(cpu_devX) \
|
|
static const struct cpu_dev *const __cpu_dev_##cpu_devX __used \
|
|
__section(".x86_cpu_dev.init") = \
|
|
&cpu_devX;
|
|
|
|
extern const struct cpu_dev *const __x86_cpu_dev_start[],
|
|
*const __x86_cpu_dev_end[];
|
|
|
|
#ifdef CONFIG_CPU_SUP_INTEL
|
|
enum tsx_ctrl_states {
|
|
TSX_CTRL_ENABLE,
|
|
TSX_CTRL_DISABLE,
|
|
TSX_CTRL_RTM_ALWAYS_ABORT,
|
|
TSX_CTRL_NOT_SUPPORTED,
|
|
};
|
|
|
|
extern __ro_after_init enum tsx_ctrl_states tsx_ctrl_state;
|
|
|
|
extern void __init tsx_init(void);
|
|
void tsx_ap_init(void);
|
|
#else
|
|
static inline void tsx_init(void) { }
|
|
static inline void tsx_ap_init(void) { }
|
|
#endif /* CONFIG_CPU_SUP_INTEL */
|
|
|
|
extern void get_cpu_cap(struct cpuinfo_x86 *c);
|
|
extern void get_cpu_address_sizes(struct cpuinfo_x86 *c);
|
|
extern void cpu_detect_cache_sizes(struct cpuinfo_x86 *c);
|
|
extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c);
|
|
extern void init_intel_cacheinfo(struct cpuinfo_x86 *c);
|
|
extern void init_amd_cacheinfo(struct cpuinfo_x86 *c);
|
|
extern void init_hygon_cacheinfo(struct cpuinfo_x86 *c);
|
|
|
|
extern void detect_num_cpu_cores(struct cpuinfo_x86 *c);
|
|
extern int detect_extended_topology_early(struct cpuinfo_x86 *c);
|
|
extern int detect_extended_topology(struct cpuinfo_x86 *c);
|
|
extern int detect_ht_early(struct cpuinfo_x86 *c);
|
|
extern void detect_ht(struct cpuinfo_x86 *c);
|
|
extern void check_null_seg_clears_base(struct cpuinfo_x86 *c);
|
|
|
|
unsigned int aperfmperf_get_khz(int cpu);
|
|
|
|
extern void x86_spec_ctrl_setup_ap(void);
|
|
extern void update_srbds_msr(void);
|
|
|
|
extern u64 x86_read_arch_cap_msr(void);
|
|
|
|
#endif /* ARCH_X86_CPU_H */
|