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- Add synthetic X86_FEATURE flags for the different AMD Zen generations

Browse Source 
and use them everywhere instead of ad-hoc family/model checks. Drop an
   ancient AMD errata checking facility as a result
 
 - Fix a fragile initcall ordering in intel_epb
 
 - Do not issue the MFENCE+LFENCE barrier for the TSC deadline and X2APIC
   MSRs on AMD as it is not needed there
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Merge tag 'x86_cpu_for_v6.8' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 cpu feature updates from Borislav Petkov:

 - Add synthetic X86_FEATURE flags for the different AMD Zen generations
   and use them everywhere instead of ad-hoc family/model checks. Drop
   an ancient AMD errata checking facility as a result

 - Fix a fragile initcall ordering in intel_epb

 - Do not issue the MFENCE+LFENCE barrier for the TSC deadline and
   X2APIC MSRs on AMD as it is not needed there

* tag 'x86_cpu_for_v6.8' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/CPU/AMD: Add X86_FEATURE_ZEN1
  x86/CPU/AMD: Drop now unused CPU erratum checking function
  x86/CPU/AMD: Get rid of amd_erratum_1485[]
  x86/CPU/AMD: Get rid of amd_erratum_400[]
  x86/CPU/AMD: Get rid of amd_erratum_383[]
  x86/CPU/AMD: Get rid of amd_erratum_1054[]
  x86/CPU/AMD: Move the DIV0 bug detection to the Zen1 init function
  x86/CPU/AMD: Move Zenbleed check to the Zen2 init function
  x86/CPU/AMD: Rename init_amd_zn() to init_amd_zen_common()
  x86/CPU/AMD: Call the spectral chicken in the Zen2 init function
  x86/CPU/AMD: Move erratum 1076 fix into the Zen1 init function
  x86/CPU/AMD: Move the Zen3 BTC_NO detection to the Zen3 init function
  x86/CPU/AMD: Carve out the erratum 1386 fix
  x86/CPU/AMD: Add ZenX generations flags
  x86/cpu/intel_epb: Don't rely on link order
  x86/barrier: Do not serialize MSR accesses on AMD
This commit is contained in:
Linus Torvalds 2024-01-08 15:45:31 -08:00
commit bef91c28f2
8 changed files with 176 additions and 162 deletions
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18
arch/x86/include/asm/barrier.h
View File

@ -81,22 +81,4 @@ do { \
#include <asm-generic/barrier.h>
/*
* Make previous memory operations globally visible before
* a WRMSR.
*
* MFENCE makes writes visible, but only affects load/store
* instructions. WRMSR is unfortunately not a load/store
* instruction and is unaffected by MFENCE. The LFENCE ensures
* that the WRMSR is not reordered.
*
* Most WRMSRs are full serializing instructions themselves and
* do not require this barrier. This is only required for the
* IA32_TSC_DEADLINE and X2APIC MSRs.
*/
static inline void weak_wrmsr_fence(void)
{
asm volatile("mfence; lfence" : : : "memory");
}
#endif /* _ASM_X86_BARRIER_H */

8
arch/x86/include/asm/cpufeatures.h
View File

@ -218,7 +218,7 @@
#define X86_FEATURE_IBRS ( 7*32+25) /* Indirect Branch Restricted Speculation */
#define X86_FEATURE_IBPB ( 7*32+26) /* Indirect Branch Prediction Barrier */
#define X86_FEATURE_STIBP ( 7*32+27) /* Single Thread Indirect Branch Predictors */
#define X86_FEATURE_ZEN (7*32+28) /* "" CPU based on Zen microarchitecture */
#define X86_FEATURE_ZEN ( 7*32+28) /* "" Generic flag for all Zen and newer */
#define X86_FEATURE_L1TF_PTEINV ( 7*32+29) /* "" L1TF workaround PTE inversion */
#define X86_FEATURE_IBRS_ENHANCED ( 7*32+30) /* Enhanced IBRS */
#define X86_FEATURE_MSR_IA32_FEAT_CTL ( 7*32+31) /* "" MSR IA32_FEAT_CTL configured */
@ -308,10 +308,14 @@
#define X86_FEATURE_SMBA (11*32+21) /* "" Slow Memory Bandwidth Allocation */
#define X86_FEATURE_BMEC (11*32+22) /* "" Bandwidth Monitoring Event Configuration */
#define X86_FEATURE_USER_SHSTK (11*32+23) /* Shadow stack support for user mode applications */
#define X86_FEATURE_SRSO (11*32+24) /* "" AMD BTB untrain RETs */
#define X86_FEATURE_SRSO_ALIAS (11*32+25) /* "" AMD BTB untrain RETs through aliasing */
#define X86_FEATURE_IBPB_ON_VMEXIT (11*32+26) /* "" Issue an IBPB only on VMEXIT */
#define X86_FEATURE_APIC_MSRS_FENCE (11*32+27) /* "" IA32_TSC_DEADLINE and X2APIC MSRs need fencing */
#define X86_FEATURE_ZEN2 (11*32+28) /* "" CPU based on Zen2 microarchitecture */
#define X86_FEATURE_ZEN3 (11*32+29) /* "" CPU based on Zen3 microarchitecture */
#define X86_FEATURE_ZEN4 (11*32+30) /* "" CPU based on Zen4 microarchitecture */
#define X86_FEATURE_ZEN1 (11*32+31) /* "" CPU based on Zen1 microarchitecture */
/* Intel-defined CPU features, CPUID level 0x00000007:1 (EAX), word 12 */
#define X86_FEATURE_AVX_VNNI (12*32+ 4) /* AVX VNNI instructions */

18
arch/x86/include/asm/processor.h
View File

@ -749,4 +749,22 @@ enum mds_mitigations {
extern bool gds_ucode_mitigated(void);
/*
* Make previous memory operations globally visible before
* a WRMSR.
*
* MFENCE makes writes visible, but only affects load/store
* instructions. WRMSR is unfortunately not a load/store
* instruction and is unaffected by MFENCE. The LFENCE ensures
* that the WRMSR is not reordered.
*
* Most WRMSRs are full serializing instructions themselves and
* do not require this barrier. This is only required for the
* IA32_TSC_DEADLINE and X2APIC MSRs.
*/
static inline void weak_wrmsr_fence(void)
{
alternative("mfence; lfence", "", ALT_NOT(X86_FEATURE_APIC_MSRS_FENCE));
}
#endif /* _ASM_X86_PROCESSOR_H */

280
arch/x86/kernel/cpu/amd.c
View File

@ -34,87 +34,6 @@
*/
static u32 nodes_per_socket = 1;
/*
* AMD errata checking
*
* Errata are defined as arrays of ints using the AMD_LEGACY_ERRATUM() or
* AMD_OSVW_ERRATUM() macros. The latter is intended for newer errata that
* have an OSVW id assigned, which it takes as first argument. Both take a
* variable number of family-specific model-stepping ranges created by
* AMD_MODEL_RANGE().
*
* Example:
*
* const int amd_erratum_319[] =
* AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0x4, 0x2),
* AMD_MODEL_RANGE(0x10, 0x8, 0x0, 0x8, 0x0),
* AMD_MODEL_RANGE(0x10, 0x9, 0x0, 0x9, 0x0));
*/
#define AMD_LEGACY_ERRATUM(...) { -1, __VA_ARGS__, 0 }
#define AMD_OSVW_ERRATUM(osvw_id, ...) { osvw_id, __VA_ARGS__, 0 }
#define AMD_MODEL_RANGE(f, m_start, s_start, m_end, s_end) \
((f << 24) | (m_start << 16) | (s_start << 12) | (m_end << 4) | (s_end))
#define AMD_MODEL_RANGE_FAMILY(range) (((range) >> 24) & 0xff)
#define AMD_MODEL_RANGE_START(range) (((range) >> 12) & 0xfff)
#define AMD_MODEL_RANGE_END(range) ((range) & 0xfff)
static const int amd_erratum_400[] =
AMD_OSVW_ERRATUM(1, AMD_MODEL_RANGE(0xf, 0x41, 0x2, 0xff, 0xf),
AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0xff, 0xf));
static const int amd_erratum_383[] =
AMD_OSVW_ERRATUM(3, AMD_MODEL_RANGE(0x10, 0, 0, 0xff, 0xf));
/* #1054: Instructions Retired Performance Counter May Be Inaccurate */
static const int amd_erratum_1054[] =
AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x17, 0, 0, 0x2f, 0xf));
static const int amd_zenbleed[] =
AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x17, 0x30, 0x0, 0x4f, 0xf),
AMD_MODEL_RANGE(0x17, 0x60, 0x0, 0x7f, 0xf),
AMD_MODEL_RANGE(0x17, 0x90, 0x0, 0x91, 0xf),
AMD_MODEL_RANGE(0x17, 0xa0, 0x0, 0xaf, 0xf));
static const int amd_div0[] =
AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x17, 0x00, 0x0, 0x2f, 0xf),
AMD_MODEL_RANGE(0x17, 0x50, 0x0, 0x5f, 0xf));
static const int amd_erratum_1485[] =
AMD_LEGACY_ERRATUM(AMD_MODEL_RANGE(0x19, 0x10, 0x0, 0x1f, 0xf),
AMD_MODEL_RANGE(0x19, 0x60, 0x0, 0xaf, 0xf));
static bool cpu_has_amd_erratum(struct cpuinfo_x86 *cpu, const int *erratum)
{
int osvw_id = *erratum++;
u32 range;
u32 ms;
if (osvw_id >= 0 && osvw_id < 65536 &&
cpu_has(cpu, X86_FEATURE_OSVW)) {
u64 osvw_len;
rdmsrl(MSR_AMD64_OSVW_ID_LENGTH, osvw_len);
if (osvw_id < osvw_len) {
u64 osvw_bits;
rdmsrl(MSR_AMD64_OSVW_STATUS + (osvw_id >> 6),
osvw_bits);
return osvw_bits & (1ULL << (osvw_id & 0x3f));
}
}
/* OSVW unavailable or ID unknown, match family-model-stepping range */
ms = (cpu->x86_model << 4) | cpu->x86_stepping;
while ((range = *erratum++))
if ((cpu->x86 == AMD_MODEL_RANGE_FAMILY(range)) &&
(ms >= AMD_MODEL_RANGE_START(range)) &&
(ms <= AMD_MODEL_RANGE_END(range)))
return true;
return false;
}
static inline int rdmsrl_amd_safe(unsigned msr, unsigned long long *p)
{
u32 gprs[8] = { 0 };
@ -616,6 +535,49 @@ static void bsp_init_amd(struct cpuinfo_x86 *c)
}
resctrl_cpu_detect(c);
/* Figure out Zen generations: */
switch (c->x86) {
case 0x17: {
switch (c->x86_model) {
case 0x00 ... 0x2f:
case 0x50 ... 0x5f:
setup_force_cpu_cap(X86_FEATURE_ZEN1);
break;
case 0x30 ... 0x4f:
case 0x60 ... 0x7f:
case 0x90 ... 0x91:
case 0xa0 ... 0xaf:
setup_force_cpu_cap(X86_FEATURE_ZEN2);
break;
default:
goto warn;
}
break;
}
case 0x19: {
switch (c->x86_model) {
case 0x00 ... 0x0f:
case 0x20 ... 0x5f:
setup_force_cpu_cap(X86_FEATURE_ZEN3);
break;
case 0x10 ... 0x1f:
case 0x60 ... 0xaf:
setup_force_cpu_cap(X86_FEATURE_ZEN4);
break;
default:
goto warn;
}
break;
}
default:
break;
}
return;
warn:
WARN_ONCE(1, "Family 0x%x, model: 0x%x??\n", c->x86, c->x86_model);
}
static void early_detect_mem_encrypt(struct cpuinfo_x86 *c)
@ -739,15 +701,6 @@ static void early_init_amd(struct cpuinfo_x86 *c)
if (c->x86 == 0x16 && c->x86_model <= 0xf)
msr_set_bit(MSR_AMD64_LS_CFG, 15);
/*
* Check whether the machine is affected by erratum 400. This is
* used to select the proper idle routine and to enable the check
* whether the machine is affected in arch_post_acpi_init(), which
* sets the X86_BUG_AMD_APIC_C1E bug depending on the MSR check.
*/
if (cpu_has_amd_erratum(c, amd_erratum_400))
set_cpu_bug(c, X86_BUG_AMD_E400);
early_detect_mem_encrypt(c);
/* Re-enable TopologyExtensions if switched off by BIOS */
@ -814,6 +767,16 @@ static void init_amd_k8(struct cpuinfo_x86 *c)
msr_set_bit(MSR_K7_HWCR, 6);
#endif
set_cpu_bug(c, X86_BUG_SWAPGS_FENCE);
/*
* Check models and steppings affected by erratum 400. This is
* used to select the proper idle routine and to enable the
* check whether the machine is affected in arch_post_acpi_subsys_init()
* which sets the X86_BUG_AMD_APIC_C1E bug depending on the MSR check.
*/
if (c->x86_model > 0x41 ||
(c->x86_model == 0x41 && c->x86_stepping >= 0x2))
setup_force_cpu_bug(X86_BUG_AMD_E400);
}
static void init_amd_gh(struct cpuinfo_x86 *c)
@ -847,8 +810,17 @@ static void init_amd_gh(struct cpuinfo_x86 *c)
*/
msr_clear_bit(MSR_AMD64_BU_CFG2, 24);
if (cpu_has_amd_erratum(c, amd_erratum_383))
set_cpu_bug(c, X86_BUG_AMD_TLB_MMATCH);
set_cpu_bug(c, X86_BUG_AMD_TLB_MMATCH);
/*
* Check models and steppings affected by erratum 400. This is
* used to select the proper idle routine and to enable the
* check whether the machine is affected in arch_post_acpi_subsys_init()
* which sets the X86_BUG_AMD_APIC_C1E bug depending on the MSR check.
*/
if (c->x86_model > 0x2 ||
(c->x86_model == 0x2 && c->x86_stepping >= 0x1))
setup_force_cpu_bug(X86_BUG_AMD_E400);
}
static void init_amd_ln(struct cpuinfo_x86 *c)
@ -941,26 +913,8 @@ static void init_amd_bd(struct cpuinfo_x86 *c)
clear_rdrand_cpuid_bit(c);
}
void init_spectral_chicken(struct cpuinfo_x86 *c)
static void fix_erratum_1386(struct cpuinfo_x86 *c)
{
#ifdef CONFIG_CPU_UNRET_ENTRY
u64 value;
/*
* On Zen2 we offer this chicken (bit) on the altar of Speculation.
*
* This suppresses speculation from the middle of a basic block, i.e. it
* suppresses non-branch predictions.
*
* We use STIBP as a heuristic to filter out Zen2 from the rest of F17H
*/
if (!cpu_has(c, X86_FEATURE_HYPERVISOR) && cpu_has(c, X86_FEATURE_AMD_STIBP)) {
if (!rdmsrl_safe(MSR_ZEN2_SPECTRAL_CHICKEN, &value)) {
value |= MSR_ZEN2_SPECTRAL_CHICKEN_BIT;
wrmsrl_safe(MSR_ZEN2_SPECTRAL_CHICKEN, value);
}
}
#endif
/*
* Work around Erratum 1386. The XSAVES instruction malfunctions in
* certain circumstances on Zen1/2 uarch, and not all parts have had
@ -972,13 +926,38 @@ void init_spectral_chicken(struct cpuinfo_x86 *c)
clear_cpu_cap(c, X86_FEATURE_XSAVES);
}
static void init_amd_zn(struct cpuinfo_x86 *c)
void init_spectral_chicken(struct cpuinfo_x86 *c)
{
set_cpu_cap(c, X86_FEATURE_ZEN);
#ifdef CONFIG_CPU_UNRET_ENTRY
u64 value;
/*
* On Zen2 we offer this chicken (bit) on the altar of Speculation.
*
* This suppresses speculation from the middle of a basic block, i.e. it
* suppresses non-branch predictions.
*/
if (!cpu_has(c, X86_FEATURE_HYPERVISOR)) {
if (!rdmsrl_safe(MSR_ZEN2_SPECTRAL_CHICKEN, &value)) {
value |= MSR_ZEN2_SPECTRAL_CHICKEN_BIT;
wrmsrl_safe(MSR_ZEN2_SPECTRAL_CHICKEN, value);
}
}
#endif
}
static void init_amd_zen_common(void)
{
setup_force_cpu_cap(X86_FEATURE_ZEN);
#ifdef CONFIG_NUMA
node_reclaim_distance = 32;
#endif
}
static void init_amd_zen1(struct cpuinfo_x86 *c)
{
init_amd_zen_common();
fix_erratum_1386(c);
/* Fix up CPUID bits, but only if not virtualised. */
if (!cpu_has(c, X86_FEATURE_HYPERVISOR)) {
@ -986,15 +965,10 @@ static void init_amd_zn(struct cpuinfo_x86 *c)
/* Erratum 1076: CPB feature bit not being set in CPUID. */
if (!cpu_has(c, X86_FEATURE_CPB))
set_cpu_cap(c, X86_FEATURE_CPB);
/*
* Zen3 (Fam19 model < 0x10) parts are not susceptible to
* Branch Type Confusion, but predate the allocation of the
* BTC_NO bit.
*/
if (c->x86 == 0x19 && !cpu_has(c, X86_FEATURE_BTC_NO))
set_cpu_cap(c, X86_FEATURE_BTC_NO);
}
pr_notice_once("AMD Zen1 DIV0 bug detected. Disable SMT for full protection.\n");
setup_force_cpu_bug(X86_BUG_DIV0);
}
static bool cpu_has_zenbleed_microcode(void)
@ -1018,11 +992,8 @@ static bool cpu_has_zenbleed_microcode(void)
return true;
}
static void zenbleed_check(struct cpuinfo_x86 *c)
static void zen2_zenbleed_check(struct cpuinfo_x86 *c)
{
if (!cpu_has_amd_erratum(c, amd_zenbleed))
return;
if (cpu_has(c, X86_FEATURE_HYPERVISOR))
return;
@ -1037,6 +1008,37 @@ static void zenbleed_check(struct cpuinfo_x86 *c)
}
}
static void init_amd_zen2(struct cpuinfo_x86 *c)
{
init_amd_zen_common();
init_spectral_chicken(c);
fix_erratum_1386(c);
zen2_zenbleed_check(c);
}
static void init_amd_zen3(struct cpuinfo_x86 *c)
{
init_amd_zen_common();
if (!cpu_has(c, X86_FEATURE_HYPERVISOR)) {
/*
* Zen3 (Fam19 model < 0x10) parts are not susceptible to
* Branch Type Confusion, but predate the allocation of the
* BTC_NO bit.
*/
if (!cpu_has(c, X86_FEATURE_BTC_NO))
set_cpu_cap(c, X86_FEATURE_BTC_NO);
}
}
static void init_amd_zen4(struct cpuinfo_x86 *c)
{
init_amd_zen_common();
if (!cpu_has(c, X86_FEATURE_HYPERVISOR))
msr_set_bit(MSR_ZEN4_BP_CFG, MSR_ZEN4_BP_CFG_SHARED_BTB_FIX_BIT);
}
static void init_amd(struct cpuinfo_x86 *c)
{
u64 vm_cr;
@ -1072,11 +1074,17 @@ static void init_amd(struct cpuinfo_x86 *c)
case 0x12: init_amd_ln(c); break;
case 0x15: init_amd_bd(c); break;
case 0x16: init_amd_jg(c); break;
case 0x17: init_spectral_chicken(c);
fallthrough;
case 0x19: init_amd_zn(c); break;
}
if (boot_cpu_has(X86_FEATURE_ZEN1))
init_amd_zen1(c);
else if (boot_cpu_has(X86_FEATURE_ZEN2))
init_amd_zen2(c);
else if (boot_cpu_has(X86_FEATURE_ZEN3))
init_amd_zen3(c);
else if (boot_cpu_has(X86_FEATURE_ZEN4))
init_amd_zen4(c);
/*
* Enable workaround for FXSAVE leak on CPUs
* without a XSaveErPtr feature
@ -1136,7 +1144,7 @@ static void init_amd(struct cpuinfo_x86 *c)
* Counter May Be Inaccurate".
*/
if (cpu_has(c, X86_FEATURE_IRPERF) &&
!cpu_has_amd_erratum(c, amd_erratum_1054))
(boot_cpu_has(X86_FEATURE_ZEN1) && c->x86_model > 0x2f))
msr_set_bit(MSR_K7_HWCR, MSR_K7_HWCR_IRPERF_EN_BIT);
check_null_seg_clears_base(c);
@ -1152,16 +1160,8 @@ static void init_amd(struct cpuinfo_x86 *c)
cpu_has(c, X86_FEATURE_AUTOIBRS))
WARN_ON_ONCE(msr_set_bit(MSR_EFER, _EFER_AUTOIBRS));
zenbleed_check(c);
if (cpu_has_amd_erratum(c, amd_div0)) {
pr_notice_once("AMD Zen1 DIV0 bug detected. Disable SMT for full protection.\n");
setup_force_cpu_bug(X86_BUG_DIV0);
}
if (!cpu_has(c, X86_FEATURE_HYPERVISOR) &&
cpu_has_amd_erratum(c, amd_erratum_1485))
msr_set_bit(MSR_ZEN4_BP_CFG, MSR_ZEN4_BP_CFG_SHARED_BTB_FIX_BIT);
/* AMD CPUs don't need fencing after x2APIC/TSC_DEADLINE MSR writes. */
clear_cpu_cap(c, X86_FEATURE_APIC_MSRS_FENCE);
}
#ifdef CONFIG_X86_32
@ -1315,7 +1315,7 @@ static void zenbleed_check_cpu(void *unused)
{
struct cpuinfo_x86 *c = &cpu_data(smp_processor_id());
zenbleed_check(c);
zen2_zenbleed_check(c);
}
void amd_check_microcode(void)

7
arch/x86/kernel/cpu/common.c
View File

@ -1856,6 +1856,13 @@ static void identify_cpu(struct cpuinfo_x86 *c)
c->topo.apicid = apic->phys_pkg_id(c->topo.initial_apicid, 0);
#endif
/*
* Set default APIC and TSC_DEADLINE MSR fencing flag. AMD and
* Hygon will clear it in ->c_init() below.
*/
set_cpu_cap(c, X86_FEATURE_APIC_MSRS_FENCE);
/*
* Vendor-specific initialization. In this section we
* canonicalize the feature flags, meaning if there are

3
arch/x86/kernel/cpu/hygon.c
View File

@ -354,6 +354,9 @@ static void init_hygon(struct cpuinfo_x86 *c)
set_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS);
check_null_seg_clears_base(c);
/* Hygon CPUs don't need fencing after x2APIC/TSC_DEADLINE MSR writes. */
clear_cpu_cap(c, X86_FEATURE_APIC_MSRS_FENCE);
}
static void cpu_detect_tlb_hygon(struct cpuinfo_x86 *c)

2
arch/x86/kernel/cpu/intel_epb.c
View File

@ -237,4 +237,4 @@ err_out_online:
cpuhp_remove_state(CPUHP_AP_X86_INTEL_EPB_ONLINE);
return ret;
}
subsys_initcall(intel_epb_init);
late_initcall(intel_epb_init);

2
tools/arch/x86/include/asm/cpufeatures.h
View File

@ -218,7 +218,7 @@
#define X86_FEATURE_IBRS ( 7*32+25) /* Indirect Branch Restricted Speculation */
#define X86_FEATURE_IBPB ( 7*32+26) /* Indirect Branch Prediction Barrier */
#define X86_FEATURE_STIBP ( 7*32+27) /* Single Thread Indirect Branch Predictors */
#define X86_FEATURE_ZEN (7*32+28) /* "" CPU based on Zen microarchitecture */
#define X86_FEATURE_ZEN ( 7*32+28) /* "" Generic flag for all Zen and newer */
#define X86_FEATURE_L1TF_PTEINV ( 7*32+29) /* "" L1TF workaround PTE inversion */
#define X86_FEATURE_IBRS_ENHANCED ( 7*32+30) /* Enhanced IBRS */
#define X86_FEATURE_MSR_IA32_FEAT_CTL ( 7*32+31) /* "" MSR IA32_FEAT_CTL configured */