deactivate fpu when cr0.PE ON?

["Dong, Eddie" <eddie.dong@xxxxxxxxx>]

	Following code deactivate fpu when CR0.PE is on, any  explaination? Rest of code active/deactive fpu based on cr0.TS bit.
	

thx, eddie




static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
{
        unsigned long guest_cr3;
        u64 eptp;

        guest_cr3 = cr3;
        if (enable_ept) {
                eptp = construct_eptp(cr3);
                vmcs_write64(EPT_POINTER, eptp);
                ept_sync_context(eptp);
                ept_load_pdptrs(vcpu);
                guest_cr3 = is_paging(vcpu) ? vcpu->arch.cr3 :
                        VMX_EPT_IDENTITY_PAGETABLE_ADDR;
        }

        vmx_flush_tlb(vcpu);
        vmcs_writel(GUEST_CR3, guest_cr3);
        if (vcpu->arch.cr0 & X86_CR0_PE)
                vmx_fpu_deactivate(vcpu);
}--
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