From 4bb9a717246aa3019a3d97904e29c4da0bfc37f9 Mon Sep 17 00:00:00 2001 From: Konrad Rzeszutek Wilk Date: Wed, 9 May 2018 21:41:38 +0200 Subject: [PATCH 57/93] x86/bugs: Rename _RDS to _SSBD commit 9f65fb29374ee37856dbad847b4e121aab72b510 upstream Intel collateral will reference the SSB mitigation bit in IA32_SPEC_CTL[2] as SSBD (Speculative Store Bypass Disable). Hence changing it. It is unclear yet what the MSR_IA32_ARCH_CAPABILITIES (0x10a) Bit(4) name is going to be. Following the rename it would be SSBD_NO but that rolls out to Speculative Store Bypass Disable No. Also fixed the missing space in X86_FEATURE_AMD_SSBD. [ tglx: Fixup x86_amd_rds_enable() and rds_tif_to_amd_ls_cfg() as well ] Signed-off-by: Konrad Rzeszutek Wilk Signed-off-by: Thomas Gleixner Signed-off-by: David Woodhouse Signed-off-by: Greg Kroah-Hartman --- arch/x86/include/asm/cpufeatures.h | 4 ++-- arch/x86/include/asm/msr-index.h | 10 +++++----- arch/x86/include/asm/spec-ctrl.h | 12 ++++++------ arch/x86/include/asm/thread_info.h | 6 +++--- arch/x86/kernel/cpu/amd.c | 14 +++++++------- arch/x86/kernel/cpu/bugs.c | 36 ++++++++++++++++++------------------ arch/x86/kernel/cpu/common.c | 2 +- arch/x86/kernel/cpu/intel.c | 2 +- arch/x86/kernel/process.c | 8 ++++---- arch/x86/kvm/cpuid.c | 2 +- arch/x86/kvm/cpuid.h | 2 +- arch/x86/kvm/vmx.c | 2 +- 12 files changed, 50 insertions(+), 50 deletions(-) diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index 8797069..0ed8ea5 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -205,7 +205,7 @@ #define X86_FEATURE_USE_IBPB ( 7*32+21) /* "" Indirect Branch Prediction Barrier enabled */ #define X86_FEATURE_USE_IBRS_FW ( 7*32+22) /* "" Use IBRS during runtime firmware calls */ #define X86_FEATURE_SPEC_STORE_BYPASS_DISABLE ( 7*32+23) /* "" Disable Speculative Store Bypass. */ -#define X86_FEATURE_AMD_RDS (7*32+24) /* "" AMD RDS implementation */ +#define X86_FEATURE_AMD_SSBD (7*32+24) /* "" AMD SSBD implementation */ /* Virtualization flags: Linux defined, word 8 */ #define X86_FEATURE_TPR_SHADOW ( 8*32+ 0) /* Intel TPR Shadow */ @@ -308,7 +308,7 @@ #define X86_FEATURE_SPEC_CTRL (18*32+26) /* "" Speculation Control (IBRS + IBPB) */ #define X86_FEATURE_INTEL_STIBP (18*32+27) /* "" Single Thread Indirect Branch Predictors */ #define X86_FEATURE_ARCH_CAPABILITIES (18*32+29) /* IA32_ARCH_CAPABILITIES MSR (Intel) */ -#define X86_FEATURE_RDS (18*32+31) /* Reduced Data Speculation */ +#define X86_FEATURE_SSBD (18*32+31) /* Speculative Store Bypass Disable */ /* * BUG word(s) diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h index 7ad3ed9..0145a0b 100644 --- a/arch/x86/include/asm/msr-index.h +++ b/arch/x86/include/asm/msr-index.h @@ -40,8 +40,8 @@ #define MSR_IA32_SPEC_CTRL 0x00000048 /* Speculation Control */ #define SPEC_CTRL_IBRS (1 << 0) /* Indirect Branch Restricted Speculation */ #define SPEC_CTRL_STIBP (1 << 1) /* Single Thread Indirect Branch Predictors */ -#define SPEC_CTRL_RDS_SHIFT 2 /* Reduced Data Speculation bit */ -#define SPEC_CTRL_RDS (1 << SPEC_CTRL_RDS_SHIFT) /* Reduced Data Speculation */ +#define SPEC_CTRL_SSBD_SHIFT 2 /* Speculative Store Bypass Disable bit */ +#define SPEC_CTRL_SSBD (1 << SPEC_CTRL_SSBD_SHIFT) /* Speculative Store Bypass Disable */ #define MSR_IA32_PRED_CMD 0x00000049 /* Prediction Command */ #define PRED_CMD_IBPB (1 << 0) /* Indirect Branch Prediction Barrier */ @@ -63,10 +63,10 @@ #define MSR_IA32_ARCH_CAPABILITIES 0x0000010a #define ARCH_CAP_RDCL_NO (1 << 0) /* Not susceptible to Meltdown */ #define ARCH_CAP_IBRS_ALL (1 << 1) /* Enhanced IBRS support */ -#define ARCH_CAP_RDS_NO (1 << 4) /* +#define ARCH_CAP_SSBD_NO (1 << 4) /* * Not susceptible to Speculative Store Bypass - * attack, so no Reduced Data Speculation control - * required. + * attack, so no Speculative Store Bypass + * control required. */ #define MSR_IA32_BBL_CR_CTL 0x00000119 diff --git a/arch/x86/include/asm/spec-ctrl.h b/arch/x86/include/asm/spec-ctrl.h index 45ef00a..dc21209 100644 --- a/arch/x86/include/asm/spec-ctrl.h +++ b/arch/x86/include/asm/spec-ctrl.h @@ -17,20 +17,20 @@ 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; +extern u64 x86_amd_ls_cfg_ssbd_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) +static inline u64 ssbd_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); + BUILD_BUG_ON(TIF_SSBD < SPEC_CTRL_SSBD_SHIFT); + return (tifn & _TIF_SSBD) >> (TIF_SSBD - SPEC_CTRL_SSBD_SHIFT); } -static inline u64 rds_tif_to_amd_ls_cfg(u64 tifn) +static inline u64 ssbd_tif_to_amd_ls_cfg(u64 tifn) { - return (tifn & _TIF_RDS) ? x86_amd_ls_cfg_rds_mask : 0ULL; + return (tifn & _TIF_SSBD) ? x86_amd_ls_cfg_ssbd_mask : 0ULL; } extern void speculative_store_bypass_update(void); diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h index 661afac..2d8788a 100644 --- a/arch/x86/include/asm/thread_info.h +++ b/arch/x86/include/asm/thread_info.h @@ -83,7 +83,7 @@ struct thread_info { #define TIF_SIGPENDING 2 /* signal pending */ #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ #define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/ -#define TIF_RDS 5 /* Reduced data speculation */ +#define TIF_SSBD 5 /* Reduced data speculation */ #define TIF_SYSCALL_EMU 6 /* syscall emulation active */ #define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */ #define TIF_SECCOMP 8 /* secure computing */ @@ -107,7 +107,7 @@ struct thread_info { #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) -#define _TIF_RDS (1 << TIF_RDS) +#define _TIF_SSBD (1 << TIF_SSBD) #define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU) #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT) #define _TIF_SECCOMP (1 << TIF_SECCOMP) @@ -141,7 +141,7 @@ struct thread_info { /* flags to check in __switch_to() */ #define _TIF_WORK_CTXSW \ - (_TIF_IO_BITMAP|_TIF_NOTSC|_TIF_BLOCKSTEP|_TIF_RDS) + (_TIF_IO_BITMAP|_TIF_NOTSC|_TIF_BLOCKSTEP|_TIF_SSBD) #define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW|_TIF_USER_RETURN_NOTIFY) #define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW) diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index a176c81..acb2fcc 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -555,12 +555,12 @@ static void bsp_init_amd(struct cpuinfo_x86 *c) } /* * Try to cache the base value so further operations can - * avoid RMW. If that faults, do not enable RDS. + * avoid RMW. If that faults, do not enable SSBD. */ if (!rdmsrl_safe(MSR_AMD64_LS_CFG, &x86_amd_ls_cfg_base)) { - setup_force_cpu_cap(X86_FEATURE_RDS); - setup_force_cpu_cap(X86_FEATURE_AMD_RDS); - x86_amd_ls_cfg_rds_mask = 1ULL << bit; + setup_force_cpu_cap(X86_FEATURE_SSBD); + setup_force_cpu_cap(X86_FEATURE_AMD_SSBD); + x86_amd_ls_cfg_ssbd_mask = 1ULL << bit; } } } @@ -849,9 +849,9 @@ static void init_amd(struct cpuinfo_x86 *c) if (!cpu_has(c, X86_FEATURE_XENPV)) set_cpu_bug(c, X86_BUG_SYSRET_SS_ATTRS); - if (boot_cpu_has(X86_FEATURE_AMD_RDS)) { - set_cpu_cap(c, X86_FEATURE_RDS); - set_cpu_cap(c, X86_FEATURE_AMD_RDS); + if (boot_cpu_has(X86_FEATURE_AMD_SSBD)) { + set_cpu_cap(c, X86_FEATURE_SSBD); + set_cpu_cap(c, X86_FEATURE_AMD_SSBD); } } diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index 9a3bb65..ae6f9ba 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -44,10 +44,10 @@ static u64 __ro_after_init x86_spec_ctrl_mask = ~SPEC_CTRL_IBRS; /* * AMD specific MSR info for Speculative Store Bypass control. - * x86_amd_ls_cfg_rds_mask is initialized in identify_boot_cpu(). + * x86_amd_ls_cfg_ssbd_mask is initialized in identify_boot_cpu(). */ u64 __ro_after_init x86_amd_ls_cfg_base; -u64 __ro_after_init x86_amd_ls_cfg_rds_mask; +u64 __ro_after_init x86_amd_ls_cfg_ssbd_mask; void __init check_bugs(void) { @@ -145,7 +145,7 @@ u64 x86_spec_ctrl_get_default(void) u64 msrval = x86_spec_ctrl_base; if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) - msrval |= rds_tif_to_spec_ctrl(current_thread_info()->flags); + msrval |= ssbd_tif_to_spec_ctrl(current_thread_info()->flags); return msrval; } EXPORT_SYMBOL_GPL(x86_spec_ctrl_get_default); @@ -158,7 +158,7 @@ void x86_spec_ctrl_set_guest(u64 guest_spec_ctrl) return; if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) - host |= rds_tif_to_spec_ctrl(current_thread_info()->flags); + host |= ssbd_tif_to_spec_ctrl(current_thread_info()->flags); if (host != guest_spec_ctrl) wrmsrl(MSR_IA32_SPEC_CTRL, guest_spec_ctrl); @@ -173,18 +173,18 @@ void x86_spec_ctrl_restore_host(u64 guest_spec_ctrl) return; if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) - host |= rds_tif_to_spec_ctrl(current_thread_info()->flags); + host |= ssbd_tif_to_spec_ctrl(current_thread_info()->flags); if (host != guest_spec_ctrl) wrmsrl(MSR_IA32_SPEC_CTRL, host); } EXPORT_SYMBOL_GPL(x86_spec_ctrl_restore_host); -static void x86_amd_rds_enable(void) +static void x86_amd_ssb_disable(void) { - u64 msrval = x86_amd_ls_cfg_base | x86_amd_ls_cfg_rds_mask; + u64 msrval = x86_amd_ls_cfg_base | x86_amd_ls_cfg_ssbd_mask; - if (boot_cpu_has(X86_FEATURE_AMD_RDS)) + if (boot_cpu_has(X86_FEATURE_AMD_SSBD)) wrmsrl(MSR_AMD64_LS_CFG, msrval); } @@ -472,7 +472,7 @@ static enum ssb_mitigation_cmd __init __ssb_select_mitigation(void) enum ssb_mitigation mode = SPEC_STORE_BYPASS_NONE; enum ssb_mitigation_cmd cmd; - if (!boot_cpu_has(X86_FEATURE_RDS)) + if (!boot_cpu_has(X86_FEATURE_SSBD)) return mode; cmd = ssb_parse_cmdline(); @@ -506,7 +506,7 @@ static enum ssb_mitigation_cmd __init __ssb_select_mitigation(void) /* * We have three CPU feature flags that are in play here: * - X86_BUG_SPEC_STORE_BYPASS - CPU is susceptible. - * - X86_FEATURE_RDS - CPU is able to turn off speculative store bypass + * - X86_FEATURE_SSBD - CPU is able to turn off speculative store bypass * - X86_FEATURE_SPEC_STORE_BYPASS_DISABLE - engage the mitigation */ if (mode == SPEC_STORE_BYPASS_DISABLE) { @@ -517,12 +517,12 @@ static enum ssb_mitigation_cmd __init __ssb_select_mitigation(void) */ switch (boot_cpu_data.x86_vendor) { case X86_VENDOR_INTEL: - x86_spec_ctrl_base |= SPEC_CTRL_RDS; - x86_spec_ctrl_mask &= ~SPEC_CTRL_RDS; - x86_spec_ctrl_set(SPEC_CTRL_RDS); + x86_spec_ctrl_base |= SPEC_CTRL_SSBD; + x86_spec_ctrl_mask &= ~SPEC_CTRL_SSBD; + x86_spec_ctrl_set(SPEC_CTRL_SSBD); break; case X86_VENDOR_AMD: - x86_amd_rds_enable(); + x86_amd_ssb_disable(); break; } } @@ -555,16 +555,16 @@ static int ssb_prctl_set(struct task_struct *task, unsigned long ctrl) if (task_spec_ssb_force_disable(task)) return -EPERM; task_clear_spec_ssb_disable(task); - update = test_and_clear_tsk_thread_flag(task, TIF_RDS); + update = test_and_clear_tsk_thread_flag(task, TIF_SSBD); break; case PR_SPEC_DISABLE: task_set_spec_ssb_disable(task); - update = !test_and_set_tsk_thread_flag(task, TIF_RDS); + update = !test_and_set_tsk_thread_flag(task, TIF_SSBD); break; case PR_SPEC_FORCE_DISABLE: task_set_spec_ssb_disable(task); task_set_spec_ssb_force_disable(task); - update = !test_and_set_tsk_thread_flag(task, TIF_RDS); + update = !test_and_set_tsk_thread_flag(task, TIF_SSBD); break; default: return -ERANGE; @@ -634,7 +634,7 @@ void x86_spec_ctrl_setup_ap(void) x86_spec_ctrl_set(x86_spec_ctrl_base & ~x86_spec_ctrl_mask); if (ssb_mode == SPEC_STORE_BYPASS_DISABLE) - x86_amd_rds_enable(); + x86_amd_ssb_disable(); } #ifdef CONFIG_SYSFS diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c index beb1da8..d0dd736 100644 --- a/arch/x86/kernel/cpu/common.c +++ b/arch/x86/kernel/cpu/common.c @@ -911,7 +911,7 @@ static void __init cpu_set_bug_bits(struct cpuinfo_x86 *c) rdmsrl(MSR_IA32_ARCH_CAPABILITIES, ia32_cap); if (!x86_match_cpu(cpu_no_spec_store_bypass) && - !(ia32_cap & ARCH_CAP_RDS_NO)) + !(ia32_cap & ARCH_CAP_SSBD_NO)) setup_force_cpu_bug(X86_BUG_SPEC_STORE_BYPASS); if (x86_match_cpu(cpu_no_speculation)) diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c index f15aea6..047adaa 100644 --- a/arch/x86/kernel/cpu/intel.c +++ b/arch/x86/kernel/cpu/intel.c @@ -154,7 +154,7 @@ static void early_init_intel(struct cpuinfo_x86 *c) setup_clear_cpu_cap(X86_FEATURE_STIBP); setup_clear_cpu_cap(X86_FEATURE_SPEC_CTRL); setup_clear_cpu_cap(X86_FEATURE_INTEL_STIBP); - setup_clear_cpu_cap(X86_FEATURE_RDS); + setup_clear_cpu_cap(X86_FEATURE_SSBD); } /* diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index 9c48e18..c344230 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -207,11 +207,11 @@ static __always_inline void __speculative_store_bypass_update(unsigned long tifn { u64 msr; - if (static_cpu_has(X86_FEATURE_AMD_RDS)) { - msr = x86_amd_ls_cfg_base | rds_tif_to_amd_ls_cfg(tifn); + if (static_cpu_has(X86_FEATURE_AMD_SSBD)) { + msr = x86_amd_ls_cfg_base | ssbd_tif_to_amd_ls_cfg(tifn); wrmsrl(MSR_AMD64_LS_CFG, msr); } else { - msr = x86_spec_ctrl_base | rds_tif_to_spec_ctrl(tifn); + msr = x86_spec_ctrl_base | ssbd_tif_to_spec_ctrl(tifn); wrmsrl(MSR_IA32_SPEC_CTRL, msr); } } @@ -250,7 +250,7 @@ void __switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p, if ((tifp ^ tifn) & _TIF_NOTSC) cr4_toggle_bits(X86_CR4_TSD); - if ((tifp ^ tifn) & _TIF_RDS) + if ((tifp ^ tifn) & _TIF_SSBD) __speculative_store_bypass_update(tifn); } diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 237e926..db95637 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -382,7 +382,7 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, /* cpuid 7.0.edx*/ const u32 kvm_cpuid_7_0_edx_x86_features = - F(SPEC_CTRL) | F(RDS) | F(ARCH_CAPABILITIES); + F(SPEC_CTRL) | F(SSBD) | F(ARCH_CAPABILITIES); /* all calls to cpuid_count() should be made on the same cpu */ get_cpu(); diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h index 39dd457..72551c5 100644 --- a/arch/x86/kvm/cpuid.h +++ b/arch/x86/kvm/cpuid.h @@ -171,7 +171,7 @@ static inline bool guest_cpuid_has_spec_ctrl(struct kvm_vcpu *vcpu) if (best && (best->ebx & bit(X86_FEATURE_IBRS))) return true; best = kvm_find_cpuid_entry(vcpu, 7, 0); - return best && (best->edx & (bit(X86_FEATURE_SPEC_CTRL) | bit(X86_FEATURE_RDS))); + return best && (best->edx & (bit(X86_FEATURE_SPEC_CTRL) | bit(X86_FEATURE_SSBD))); } static inline bool guest_cpuid_has_arch_capabilities(struct kvm_vcpu *vcpu) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 17199dc..c7df5c4 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -3133,7 +3133,7 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) return 1; /* The STIBP bit doesn't fault even if it's not advertised */ - if (data & ~(SPEC_CTRL_IBRS | SPEC_CTRL_STIBP | SPEC_CTRL_RDS)) + if (data & ~(SPEC_CTRL_IBRS | SPEC_CTRL_STIBP | SPEC_CTRL_SSBD)) return 1; vmx->spec_ctrl = data; -- 2.7.4