enable tun/tap/iptables

hc

2024-05-10 ee930fffee469d076998274a2ca55e13dc1efb67

 kernel/arch/x86/kvm/cpuid.c
..
..
@@ -491,6 +491,9 @@
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 	    !boot_cpu_has(X86_FEATURE_AMD_SSBD))
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 		kvm_cpu_cap_set(X86_FEATURE_VIRT_SSBD);
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+	if (cpu_feature_enabled(X86_FEATURE_SRSO_NO))
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+		kvm_cpu_cap_set(X86_FEATURE_SRSO_NO);
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+
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 	/*
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 	 * Hide all SVM features by default, SVM will set the cap bits for
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 	 * features it emulates and/or exposes for L1.
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@@ -511,15 +514,21 @@
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 	int nent;
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 };
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-static struct kvm_cpuid_entry2 *do_host_cpuid(struct kvm_cpuid_array *array,
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-					      u32 function, u32 index)
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+static struct kvm_cpuid_entry2 *get_next_cpuid(struct kvm_cpuid_array *array)
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 {
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-	struct kvm_cpuid_entry2 *entry;
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-
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 	if (array->nent >= array->maxnent)
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 		return NULL;
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-	entry = &array->entries[array->nent++];
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+	return &array->entries[array->nent++];
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+}
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+
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+static struct kvm_cpuid_entry2 *do_host_cpuid(struct kvm_cpuid_array *array,
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+					      u32 function, u32 index)
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+{
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+	struct kvm_cpuid_entry2 *entry = get_next_cpuid(array);
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+
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+	if (!entry)
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+		return NULL;
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 	entry->function = function;
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 	entry->index = index;
..
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@@ -698,22 +707,13 @@
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 		entry->edx = edx.full;
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 		break;
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 	}
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-	/*
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-	 * Per Intel's SDM, the 0x1f is a superset of 0xb,
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-	 * thus they can be handled by common code.
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-	 */
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 	case 0x1f:
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 	case 0xb:
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 		/*
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-		 * Populate entries until the level type (ECX[15:8]) of the
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-		 * previous entry is zero.  Note, CPUID EAX.{0x1f,0xb}.0 is
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-		 * the starting entry, filled by the primary do_host_cpuid().
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+		 * No topology; a valid topology is indicated by the presence
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+		 * of subleaf 1.
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 		 */
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-		for (i = 1; entry->ecx & 0xff00; ++i) {
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-			entry = do_host_cpuid(array, function, i);
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-			if (!entry)
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-				goto out;
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-		}
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+		entry->eax = entry->ebx = entry->ecx = 0;
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 		break;
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 	case 0xd:
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 		entry->eax &= supported_xcr0;
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@@ -866,6 +866,9 @@
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 		entry->ebx = entry->ecx = entry->edx = 0;
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 		break;
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 	case 0x8000001e:
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+		/* Do not return host topology information.  */
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+		entry->eax = entry->ebx = entry->ecx = 0;
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+		entry->edx = 0; /* reserved */
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 		break;
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 	/* Support memory encryption cpuid if host supports it */
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 	case 0x8000001F: