diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index c068027ac55f..bc3fb0b0e9fd 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -647,6 +647,7 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
 			g_phys_as = phys_as;
 
 		entry->eax = g_phys_as | (virt_as << 8);
+		entry->ecx &= ~(GENMASK(31, 16) | GENMASK(11, 8));
 		entry->edx = 0;
 		/*
 		 * IBRS, IBPB and VIRT_SSBD aren't necessarily present in