Commit f1cdecf5 authored Dec 10, 2019 by Sean Christopherson Committed by Paolo Bonzini Jan 21, 2020

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

Check the current CPU's reserved cr4 bits against the mask calculated
for the boot CPU to ensure consistent behavior across all CPUs.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

parent b11306b5

arch/x86/kvm/x86.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -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();
		}