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x86/bugs: Rename _RDS to _SSBD

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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 <konrad.wilk@oracle.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Konrad Rzeszutek Wilk 2018-05-09 21:41:38 +02:00 committed by Thomas Gleixner
parent f21b53b20c
commit 9f65fb2937
11 changed files with 51 additions and 51 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/include/asm/cpufeatures.h
View File

@ -215,7 +215,7 @@
#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 */
@ -336,7 +336,7 @@
#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)

10
arch/x86/include/asm/msr-index.h
View File

@ -42,8 +42,8 @@
#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 */
@ -70,10 +70,10 @@
#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

12
arch/x86/include/asm/spec-ctrl.h
View File

@ -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);

6
arch/x86/include/asm/thread_info.h
View File

@ -79,7 +79,7 @@ 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 */
@ -106,7 +106,7 @@ 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)
@ -146,7 +146,7 @@ struct thread_info {
/* flags to check in __switch_to() */
#define _TIF_WORK_CTXSW \
(_TIF_IO_BITMAP|_TIF_NOCPUID|_TIF_NOTSC|_TIF_BLOCKSTEP|_TIF_RDS)
(_TIF_IO_BITMAP|_TIF_NOCPUID|_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)

14
arch/x86/kernel/cpu/amd.c
View File

@ -567,12 +567,12 @@ 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;
}
}
}
@ -920,9 +920,9 @@ 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);
}
}

36
arch/x86/kernel/cpu/bugs.c
View File

@ -45,10 +45,10 @@ 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)
{
@ -146,7 +146,7 @@ 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);
@ -159,7 +159,7 @@ 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);
@ -174,18 +174,18 @@ 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);
}
@ -473,7 +473,7 @@ 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();
@ -507,7 +507,7 @@ 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) {
@ -518,12 +518,12 @@ 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;
}
}
@ -556,16 +556,16 @@ 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;
@ -635,7 +635,7 @@ 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

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

@ -959,7 +959,7 @@ 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))

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

@ -189,7 +189,7 @@ 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);
}
/*

8
arch/x86/kernel/process.c
View File

@ -283,11 +283,11 @@ 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);
}
}
@ -329,7 +329,7 @@ void __switch_to_xtra(struct task_struct *prev_p, struct task_struct *next_p,
if ((tifp ^ tifn) & _TIF_NOCPUID)
set_cpuid_faulting(!!(tifn & _TIF_NOCPUID));
if ((tifp ^ tifn) & _TIF_RDS)
if ((tifp ^ tifn) & _TIF_SSBD)
__speculative_store_bypass_update(tifn);
}

2
arch/x86/kvm/cpuid.c
View File

@ -407,7 +407,7 @@ 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(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) | F(RDS) |
F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) | F(SSBD) |
F(ARCH_CAPABILITIES);
/* all calls to cpuid_count() should be made on the same cpu */

6
arch/x86/kvm/vmx.c
View File

@ -3525,7 +3525,7 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
if (!msr_info->host_initiated &&
!guest_cpuid_has(vcpu, X86_FEATURE_IBRS) &&
!guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) &&
!guest_cpuid_has(vcpu, X86_FEATURE_RDS))
!guest_cpuid_has(vcpu, X86_FEATURE_SSBD))
return 1;
msr_info->data = to_vmx(vcpu)->spec_ctrl;
@ -3645,11 +3645,11 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
if (!msr_info->host_initiated &&
!guest_cpuid_has(vcpu, X86_FEATURE_IBRS) &&
!guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) &&
!guest_cpuid_has(vcpu, X86_FEATURE_RDS))
!guest_cpuid_has(vcpu, X86_FEATURE_SSBD))
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;