From: Mark Gross mgross@linux.intel.com
commit e9d7144597b10ff13ff2264c059f7d4a7fbc89ac upstream.
Intel uses the same family/model for several CPUs. Sometimes the stepping must be checked to tell them apart.
On x86 there can be at most 16 steppings. Add a steppings bitmask to x86_cpu_id and a X86_MATCH_VENDOR_FAMILY_MODEL_STEPPING_FEATURE macro and support for matching against family/model/stepping.
[ bp: Massage. ]
Signed-off-by: Mark Gross mgross@linux.intel.com Signed-off-by: Borislav Petkov bp@suse.de Signed-off-by: Thomas Gleixner tglx@linutronix.de Reviewed-by: Tony Luck tony.luck@intel.com Reviewed-by: Josh Poimboeuf jpoimboe@redhat.com [cascardo: have steppings be the last member as there are initializers that don't use named members] Signed-off-by: Thadeu Lima de Souza Cascardo cascardo@canonical.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org [suleiman: vmx.c moved] Signed-off-by: Suleiman Souhlal suleiman@google.com --- arch/x86/include/asm/cpu_device_id.h | 27 ++++++++++++++++++++++++--- arch/x86/kernel/cpu/match.c | 7 ++++++- arch/x86/kvm/vmx.c | 6 +++--- arch/x86/kvm/x86.c | 4 ++-- include/linux/kvm_host.h | 2 +- include/linux/mod_devicetable.h | 6 ++++++ 6 files changed, 42 insertions(+), 10 deletions(-)
diff --git a/arch/x86/include/asm/cpu_device_id.h b/arch/x86/include/asm/cpu_device_id.h index f11770fac73a..cdf39decf734 100644 --- a/arch/x86/include/asm/cpu_device_id.h +++ b/arch/x86/include/asm/cpu_device_id.h @@ -20,12 +20,14 @@ #define X86_CENTAUR_FAM6_C7_D 0xd #define X86_CENTAUR_FAM6_NANO 0xf
+#define X86_STEPPINGS(mins, maxs) GENMASK(maxs, mins) /** - * X86_MATCH_VENDOR_FAM_MODEL_FEATURE - Base macro for CPU matching + * X86_MATCH_VENDOR_FAM_MODEL_STEPPINGS_FEATURE - Base macro for CPU matching * @_vendor: The vendor name, e.g. INTEL, AMD, HYGON, ..., ANY * The name is expanded to X86_VENDOR_@_vendor * @_family: The family number or X86_FAMILY_ANY * @_model: The model number, model constant or X86_MODEL_ANY + * @_steppings: Bitmask for steppings, stepping constant or X86_STEPPING_ANY * @_feature: A X86_FEATURE bit or X86_FEATURE_ANY * @_data: Driver specific data or NULL. The internal storage * format is unsigned long. The supplied value, pointer @@ -37,15 +39,34 @@ * into another macro at the usage site for good reasons, then please * start this local macro with X86_MATCH to allow easy grepping. */ -#define X86_MATCH_VENDOR_FAM_MODEL_FEATURE(_vendor, _family, _model, \ - _feature, _data) { \ +#define X86_MATCH_VENDOR_FAM_MODEL_STEPPINGS_FEATURE(_vendor, _family, _model, \ + _steppings, _feature, _data) { \ .vendor = X86_VENDOR_##_vendor, \ .family = _family, \ .model = _model, \ + .steppings = _steppings, \ .feature = _feature, \ .driver_data = (unsigned long) _data \ }
+/** + * X86_MATCH_VENDOR_FAM_MODEL_FEATURE - Macro for CPU matching + * @_vendor: The vendor name, e.g. INTEL, AMD, HYGON, ..., ANY + * The name is expanded to X86_VENDOR_@_vendor + * @_family: The family number or X86_FAMILY_ANY + * @_model: The model number, model constant or X86_MODEL_ANY + * @_feature: A X86_FEATURE bit or X86_FEATURE_ANY + * @_data: Driver specific data or NULL. The internal storage + * format is unsigned long. The supplied value, pointer + * etc. is casted to unsigned long internally. + * + * The steppings arguments of X86_MATCH_VENDOR_FAM_MODEL_STEPPINGS_FEATURE() is + * set to wildcards. + */ +#define X86_MATCH_VENDOR_FAM_MODEL_FEATURE(vendor, family, model, feature, data) \ + X86_MATCH_VENDOR_FAM_MODEL_STEPPINGS_FEATURE(vendor, family, model, \ + X86_STEPPING_ANY, feature, data) + /** * X86_MATCH_VENDOR_FAM_FEATURE - Macro for matching vendor, family and CPU feature * @vendor: The vendor name, e.g. INTEL, AMD, HYGON, ..., ANY diff --git a/arch/x86/kernel/cpu/match.c b/arch/x86/kernel/cpu/match.c index d3482eb43ff3..ad6776081e60 100644 --- a/arch/x86/kernel/cpu/match.c +++ b/arch/x86/kernel/cpu/match.c @@ -39,13 +39,18 @@ const struct x86_cpu_id *x86_match_cpu(const struct x86_cpu_id *match) const struct x86_cpu_id *m; struct cpuinfo_x86 *c = &boot_cpu_data;
- for (m = match; m->vendor | m->family | m->model | m->feature; m++) { + for (m = match; + m->vendor | m->family | m->model | m->steppings | m->feature; + m++) { if (m->vendor != X86_VENDOR_ANY && c->x86_vendor != m->vendor) continue; if (m->family != X86_FAMILY_ANY && c->x86 != m->family) continue; if (m->model != X86_MODEL_ANY && c->x86_model != m->model) continue; + if (m->steppings != X86_STEPPING_ANY && + !(BIT(c->x86_stepping) & m->steppings)) + continue; if (m->feature != X86_FEATURE_ANY && !cpu_has(c, m->feature)) continue; return m; diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 88c2027d9305..952a58cad25f 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -2133,9 +2133,9 @@ static __always_inline void vmx_disable_fb_clear(struct vcpu_vmx *vmx) if (!vmx->disable_fb_clear) return;
- rdmsrl(MSR_IA32_MCU_OPT_CTRL, msr); + msr = __rdmsr(MSR_IA32_MCU_OPT_CTRL); msr |= FB_CLEAR_DIS; - wrmsrl(MSR_IA32_MCU_OPT_CTRL, msr); + native_wrmsrl(MSR_IA32_MCU_OPT_CTRL, msr); /* Cache the MSR value to avoid reading it later */ vmx->msr_ia32_mcu_opt_ctrl = msr; } @@ -2146,7 +2146,7 @@ static __always_inline void vmx_enable_fb_clear(struct vcpu_vmx *vmx) return;
vmx->msr_ia32_mcu_opt_ctrl &= ~FB_CLEAR_DIS; - wrmsrl(MSR_IA32_MCU_OPT_CTRL, vmx->msr_ia32_mcu_opt_ctrl); + native_wrmsrl(MSR_IA32_MCU_OPT_CTRL, vmx->msr_ia32_mcu_opt_ctrl); }
static void vmx_update_fb_clear_dis(struct kvm_vcpu *vcpu, struct vcpu_vmx *vmx) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index be4697d91bb2..3c6c2253c2fb 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -9736,9 +9736,9 @@ void kvm_arch_end_assignment(struct kvm *kvm) } EXPORT_SYMBOL_GPL(kvm_arch_end_assignment);
-bool kvm_arch_has_assigned_device(struct kvm *kvm) +bool noinstr kvm_arch_has_assigned_device(struct kvm *kvm) { - return atomic_read(&kvm->arch.assigned_device_count); + return arch_atomic_read(&kvm->arch.assigned_device_count); } EXPORT_SYMBOL_GPL(kvm_arch_has_assigned_device);
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 4f96aef4e8b8..f67ab4e9b665 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -928,7 +928,7 @@ static inline void kvm_arch_end_assignment(struct kvm *kvm) { }
-static inline bool kvm_arch_has_assigned_device(struct kvm *kvm) +static __always_inline bool kvm_arch_has_assigned_device(struct kvm *kvm) { return false; } diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h index c3c4037f001f..9e3600572e9c 100644 --- a/include/linux/mod_devicetable.h +++ b/include/linux/mod_devicetable.h @@ -621,6 +621,10 @@ struct mips_cdmm_device_id { /* * MODULE_DEVICE_TABLE expects this struct to be called x86cpu_device_id. * Although gcc seems to ignore this error, clang fails without this define. + * + * Note: The ordering of the struct is different from upstream because the + * static initializers in kernels < 5.7 still use C89 style while upstream + * has been converted to proper C99 initializers. */ #define x86cpu_device_id x86_cpu_id struct x86_cpu_id { @@ -629,12 +633,14 @@ struct x86_cpu_id { __u16 model; __u16 feature; /* bit index */ kernel_ulong_t driver_data; + __u16 steppings; };
/* Wild cards for x86_cpu_id::vendor, family, model and feature */ #define X86_VENDOR_ANY 0xffff #define X86_FAMILY_ANY 0 #define X86_MODEL_ANY 0 +#define X86_STEPPING_ANY 0 #define X86_FEATURE_ANY 0 /* Same as FPU, you can't test for that */
/*