KVM: VMX: Fix host MSR_KERNEL_GS_BASE corruption

enter_lmode() and exit_lmode() modify the guest's EFER.LMA before calling
vmx_set_efer().  However, the latter function depends on the value of EFER.LMA
to determine whether MSR_KERNEL_GS_BASE needs reloading, via
vmx_load_host_state().  With EFER.LMA changing under its feet, it took the
wrong choice and corrupted userspace's %gs.

This causes 32-on-64 host userspace to fault.

Fix not touching EFER.LMA; instead ask vmx_set_efer() to change it.

Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 859a01a07dbfb2937b8f0792e4a4aa0bbe50767b..ee03679efe788d61e73d76f818931d8c1a45fad2 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1744,18 +1744,15 @@ static void enter_lmode(struct kvm_vcpu *vcpu)
                             (guest_tr_ar & ~AR_TYPE_MASK)
                             | AR_TYPE_BUSY_64_TSS);
        }
-       vcpu->arch.efer |= EFER_LMA;
-       vmx_set_efer(vcpu, vcpu->arch.efer);
+       vmx_set_efer(vcpu, vcpu->arch.efer | EFER_LMA);
 }
 
 static void exit_lmode(struct kvm_vcpu *vcpu)
 {
-       vcpu->arch.efer &= ~EFER_LMA;
-
        vmcs_write32(VM_ENTRY_CONTROLS,
                     vmcs_read32(VM_ENTRY_CONTROLS)
                     & ~VM_ENTRY_IA32E_MODE);
-       vmx_set_efer(vcpu, vcpu->arch.efer);
+       vmx_set_efer(vcpu, vcpu->arch.efer & ~EFER_LMA);
 }
 
 #endif