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KVM: VMX: Don't toggle VM_ENTRY_IA32E_MODE for 32-bit kernels/KVM 

Don't toggle VM_ENTRY_IA32E_MODE in 32-bit kernels/KVM and instead bug
the VM if KVM attempts to run the guest with EFER.LMA=1. KVM doesn't
support running 64-bit guests with 32-bit hosts.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20220830133737.1539624-23-vkuznets@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2022-08-30 15:37:26 +02:00 committed by Paolo Bonzini
parent 1dae276569
commit ebb3c8d409
1 changed files with 5 additions and 0 deletions
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5
arch/x86/kvm/vmx/vmx.c
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@ -3039,10 +3039,15 @@ int vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer)
return 0;
vcpu->arch.efer = efer;
#ifdef CONFIG_X86_64
if (efer & EFER_LMA)
vm_entry_controls_setbit(vmx, VM_ENTRY_IA32E_MODE);
else
vm_entry_controls_clearbit(vmx, VM_ENTRY_IA32E_MODE);
#else
if (KVM_BUG_ON(efer & EFER_LMA, vcpu->kvm))
return 1;
#endif
vmx_setup_uret_msrs(vmx);
return 0;