KVM: x86: Ensure all logical CPUs have consistent reserved cr4 bits

[linux-block.git] / arch / x86 / kvm / x86.c

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 8a907cd7b1e182c3d7c7c2f37e59beefad55a3a1..960b886e1e436090bff3589c1111535f22702c67 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9461,6 +9461,13 @@ void kvm_arch_hardware_unsetup(void)
 
 int kvm_arch_check_processor_compat(void)
 {
+       struct cpuinfo_x86 *c = &cpu_data(smp_processor_id());
+
+       WARN_ON(!irqs_disabled());
+
+       if (kvm_host_cr4_reserved_bits(c) != cr4_reserved_bits)
+               return -EIO;
+
        return kvm_x86_ops->check_processor_compatibility();
 }