x86/speculation: Use synthetic bits for IBRS/IBPB/STIBP

Intel and AMD have different CPUID bits hence for those use synthetic bits
which get set on the respective vendor's in init_speculation_control(). So
that debacles like what the commit message of

  c65732e4f721 ("x86/cpu: Restore CPUID_8000_0008_EBX reload")

talks about don't happen anymore.

Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Jörg Otte <jrg.otte@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Link: https://lkml.kernel.org/r/20180504161815.GG9257@pd.tnic

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 4e1c747..cb9bca8 100644 (file)
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -198,7 +198,6 @@
 #define X86_FEATURE_CAT_L2             ( 7*32+ 5) /* Cache Allocation Technology L2 */
 #define X86_FEATURE_CDP_L3             ( 7*32+ 6) /* Code and Data Prioritization L3 */
 #define X86_FEATURE_INVPCID_SINGLE     ( 7*32+ 7) /* Effectively INVPCID && CR4.PCIDE=1 */
-
 #define X86_FEATURE_HW_PSTATE          ( 7*32+ 8) /* AMD HW-PState */
 #define X86_FEATURE_PROC_FEEDBACK      ( 7*32+ 9) /* AMD ProcFeedbackInterface */
 #define X86_FEATURE_SME                        ( 7*32+10) /* AMD Secure Memory Encryption */
@@ -216,6 +215,9 @@
 #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_SSBD           ( 7*32+24)  /* "" AMD SSBD implementation */
+#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 */
 
 /* Virtualization flags: Linux defined, word 8 */
 #define X86_FEATURE_TPR_SHADOW         ( 8*32+ 0) /* Intel TPR Shadow */
@@ -276,9 +278,9 @@
 #define X86_FEATURE_CLZERO             (13*32+ 0) /* CLZERO instruction */
 #define X86_FEATURE_IRPERF             (13*32+ 1) /* Instructions Retired Count */
 #define X86_FEATURE_XSAVEERPTR         (13*32+ 2) /* Always save/restore FP error pointers */
-#define X86_FEATURE_IBPB               (13*32+12) /* Indirect Branch Prediction Barrier */
-#define X86_FEATURE_IBRS               (13*32+14) /* Indirect Branch Restricted Speculation */
-#define X86_FEATURE_STIBP              (13*32+15) /* Single Thread Indirect Branch Predictors */
+#define X86_FEATURE_AMD_IBPB           (13*32+12) /* "" Indirect Branch Prediction Barrier */
+#define X86_FEATURE_AMD_IBRS           (13*32+14) /* "" Indirect Branch Restricted Speculation */
+#define X86_FEATURE_AMD_STIBP          (13*32+15) /* "" Single Thread Indirect Branch Predictors */
 
 /* Thermal and Power Management Leaf, CPUID level 0x00000006 (EAX), word 14 */
 #define X86_FEATURE_DTHERM             (14*32+ 0) /* Digital Thermal Sensor */

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 9fbb388..e6cd38b 100644 (file)
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -757,17 +757,23 @@ static void init_speculation_control(struct cpuinfo_x86 *c)
         * and they also have a different bit for STIBP support. Also,
         * a hypervisor might have set the individual AMD bits even on
         * Intel CPUs, for finer-grained selection of what's available.
-        *
-        * We use the AMD bits in 0x8000_0008 EBX as the generic hardware
-        * features, which are visible in /proc/cpuinfo and used by the
-        * kernel. So set those accordingly from the Intel bits.
         */
        if (cpu_has(c, X86_FEATURE_SPEC_CTRL)) {
                set_cpu_cap(c, X86_FEATURE_IBRS);
                set_cpu_cap(c, X86_FEATURE_IBPB);
        }
+
        if (cpu_has(c, X86_FEATURE_INTEL_STIBP))
                set_cpu_cap(c, X86_FEATURE_STIBP);
+
+       if (cpu_has(c, X86_FEATURE_AMD_IBRS))
+               set_cpu_cap(c, X86_FEATURE_IBRS);
+
+       if (cpu_has(c, X86_FEATURE_AMD_IBPB))
+               set_cpu_cap(c, X86_FEATURE_IBPB);
+
+       if (cpu_has(c, X86_FEATURE_AMD_STIBP))
+               set_cpu_cap(c, X86_FEATURE_STIBP);
 }
 
 void get_cpu_cap(struct cpuinfo_x86 *c)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 865c9a7..e5ba485 100644 (file)
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -379,7 +379,7 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
 
        /* cpuid 0x80000008.ebx */
        const u32 kvm_cpuid_8000_0008_ebx_x86_features =
-               F(IBPB) | F(IBRS);
+               F(AMD_IBPB) | F(AMD_IBRS);
 
        /* cpuid 0xC0000001.edx */
        const u32 kvm_cpuid_C000_0001_edx_x86_features =
@@ -648,10 +648,10 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
                entry->eax = g_phys_as | (virt_as << 8);
                entry->edx = 0;
                /* IBRS and IBPB aren't necessarily present in hardware cpuid */
-               if (boot_cpu_has(X86_FEATURE_IBPB))
-                       entry->ebx |= F(IBPB);
-               if (boot_cpu_has(X86_FEATURE_IBRS))
-                       entry->ebx |= F(IBRS);
+               if (boot_cpu_has(X86_FEATURE_AMD_IBPB))
+                       entry->ebx |= F(AMD_IBPB);
+               if (boot_cpu_has(X86_FEATURE_AMD_IBRS))
+                       entry->ebx |= F(AMD_IBRS);
                entry->ebx &= kvm_cpuid_8000_0008_ebx_x86_features;
                cpuid_mask(&entry->ebx, CPUID_8000_0008_EBX);
                break;

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index fa891c8..1a7a811 100644 (file)
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -4108,7 +4108,7 @@ static int svm_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
                break;
        case MSR_IA32_SPEC_CTRL:
                if (!msr_info->host_initiated &&
-                   !guest_cpuid_has(vcpu, X86_FEATURE_IBRS))
+                   !guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS))
                        return 1;
 
                msr_info->data = svm->spec_ctrl;
@@ -4203,7 +4203,7 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
                break;
        case MSR_IA32_SPEC_CTRL:
                if (!msr->host_initiated &&
-                   !guest_cpuid_has(vcpu, X86_FEATURE_IBRS))
+                   !guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBRS))
                        return 1;
 
                /* The STIBP bit doesn't fault even if it's not advertised */
@@ -4230,7 +4230,7 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
                break;
        case MSR_IA32_PRED_CMD:
                if (!msr->host_initiated &&
-                   !guest_cpuid_has(vcpu, X86_FEATURE_IBPB))
+                   !guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB))
                        return 1;
 
                if (data & ~PRED_CMD_IBPB)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 9b8d80b..210e1b6 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -3523,9 +3523,7 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
                return kvm_get_msr_common(vcpu, msr_info);
        case MSR_IA32_SPEC_CTRL:
                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_SSBD))
+                   !guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL))
                        return 1;
 
                msr_info->data = to_vmx(vcpu)->spec_ctrl;
@@ -3643,9 +3641,7 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
                break;
        case MSR_IA32_SPEC_CTRL:
                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_SSBD))
+                   !guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL))
                        return 1;
 
                /* The STIBP bit doesn't fault even if it's not advertised */
@@ -3675,7 +3671,6 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
                break;
        case MSR_IA32_PRED_CMD:
                if (!msr_info->host_initiated &&
-                   !guest_cpuid_has(vcpu, X86_FEATURE_IBPB) &&
                    !guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL))
                        return 1;