Merge tag 'x86_cpu_for_6.7_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 cpuid updates from Borislav Petkov:

 - Make sure the "svm" feature flag is cleared from /proc/cpuinfo when
   virtualization support is disabled in the BIOS on AMD and Hygon
   platforms

 - A minor cleanup

* tag 'x86_cpu_for_6.7_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/cpu/amd: Remove redundant 'break' statement
  x86/cpu: Clear SVM feature if disabled by BIOS

5 files changed, 25 insertions, 16 deletions

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index b37abb55e948..61705dd0e94a 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -1117,12 +1117,16 @@
 #define MSR_IA32_VMX_MISC_INTEL_PT                 (1ULL << 14)
 #define MSR_IA32_VMX_MISC_VMWRITE_SHADOW_RO_FIELDS (1ULL << 29)
 #define MSR_IA32_VMX_MISC_PREEMPTION_TIMER_SCALE   0x1F
-/* AMD-V MSRs */
 
+/* AMD-V MSRs */
 #define MSR_VM_CR                       0xc0010114
 #define MSR_VM_IGNNE                    0xc0010115
 #define MSR_VM_HSAVE_PA                 0xc0010117
 
+#define SVM_VM_CR_VALID_MASK		0x001fULL
+#define SVM_VM_CR_SVM_LOCK_MASK		0x0008ULL
+#define SVM_VM_CR_SVM_DIS_MASK		0x0010ULL
+
 /* Hardware Feedback Interface */
 #define MSR_IA32_HW_FEEDBACK_PTR        0x17d0
 #define MSR_IA32_HW_FEEDBACK_CONFIG     0x17d1
diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h
index 3ac0ffc4f3e2..87a7b917d30e 100644
--- a/arch/x86/include/asm/svm.h
+++ b/arch/x86/include/asm/svm.h
@@ -229,10 +229,6 @@ struct __attribute__ ((__packed__)) vmcb_control_area {
 #define SVM_IOIO_SIZE_MASK (7 << SVM_IOIO_SIZE_SHIFT)
 #define SVM_IOIO_ASIZE_MASK (7 << SVM_IOIO_ASIZE_SHIFT)
 
-#define SVM_VM_CR_VALID_MASK	0x001fULL
-#define SVM_VM_CR_SVM_LOCK_MASK 0x0008ULL
-#define SVM_VM_CR_SVM_DIS_MASK  0x0010ULL
-
 #define SVM_NESTED_CTL_NP_ENABLE	BIT(0)
 #define SVM_NESTED_CTL_SEV_ENABLE	BIT(1)
 #define SVM_NESTED_CTL_SEV_ES_ENABLE	BIT(2)
@@ -572,8 +568,6 @@ struct vmcb {
 
 #define SVM_CPUID_FUNC 0x8000000a
 
-#define SVM_VM_CR_SVM_DISABLE 4
-
 #define SVM_SELECTOR_S_SHIFT 4
 #define SVM_SELECTOR_DPL_SHIFT 5
 #define SVM_SELECTOR_P_SHIFT 7
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index ece2b5b7b0fe..d97d473545a6 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -1014,7 +1014,6 @@ static bool cpu_has_zenbleed_microcode(void)
 
 	default:
 		return false;
-		break;
 	}
 
 	if (boot_cpu_data.microcode < good_rev)
@@ -1044,6 +1043,8 @@ static void zenbleed_check(struct cpuinfo_x86 *c)
 
 static void init_amd(struct cpuinfo_x86 *c)
 {
+	u64 vm_cr;
+
 	early_init_amd(c);
 
 	/*
@@ -1095,6 +1096,14 @@ static void init_amd(struct cpuinfo_x86 *c)
 
 	init_amd_cacheinfo(c);
 
+	if (cpu_has(c, X86_FEATURE_SVM)) {
+		rdmsrl(MSR_VM_CR, vm_cr);
+		if (vm_cr & SVM_VM_CR_SVM_DIS_MASK) {
+			pr_notice_once("SVM disabled (by BIOS) in MSR_VM_CR\n");
+			clear_cpu_cap(c, X86_FEATURE_SVM);
+		}
+	}
+
 	if (!cpu_has(c, X86_FEATURE_LFENCE_RDTSC) && cpu_has(c, X86_FEATURE_XMM2)) {
 		/*
 		 * Use LFENCE for execution serialization.  On families which
diff --git a/arch/x86/kernel/cpu/hygon.c b/arch/x86/kernel/cpu/hygon.c
index defdc594be14..16f34639ecf7 100644
--- a/arch/x86/kernel/cpu/hygon.c
+++ b/arch/x86/kernel/cpu/hygon.c
@@ -290,6 +290,8 @@ static void early_init_hygon(struct cpuinfo_x86 *c)
 
 static void init_hygon(struct cpuinfo_x86 *c)
 {
+	u64 vm_cr;
+
 	early_init_hygon(c);
 
 	/*
@@ -320,6 +322,14 @@ static void init_hygon(struct cpuinfo_x86 *c)
 
 	init_hygon_cacheinfo(c);
 
+	if (cpu_has(c, X86_FEATURE_SVM)) {
+		rdmsrl(MSR_VM_CR, vm_cr);
+		if (vm_cr & SVM_VM_CR_SVM_DIS_MASK) {
+			pr_notice_once("SVM disabled (by BIOS) in MSR_VM_CR\n");
+			clear_cpu_cap(c, X86_FEATURE_SVM);
+		}
+	}
+
 	if (cpu_has(c, X86_FEATURE_XMM2)) {
 		/*
 		 * Use LFENCE for execution serialization.  On families which
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index beea99c8e8e0..ded1d80d72cb 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -531,8 +531,6 @@ static bool __kvm_is_svm_supported(void)
 	int cpu = smp_processor_id();
 	struct cpuinfo_x86 *c = &cpu_data(cpu);
 
-	u64 vm_cr;
-
 	if (c->x86_vendor != X86_VENDOR_AMD &&
 	    c->x86_vendor != X86_VENDOR_HYGON) {
 		pr_err("CPU %d isn't AMD or Hygon\n", cpu);
@@ -549,12 +547,6 @@ static bool __kvm_is_svm_supported(void)
 		return false;
 	}
 
-	rdmsrl(MSR_VM_CR, vm_cr);
-	if (vm_cr & (1 << SVM_VM_CR_SVM_DISABLE)) {
-		pr_err("SVM disabled (by BIOS) in MSR_VM_CR on CPU %d\n", cpu);
-		return false;
-	}
-
 	return true;
 }