static void vmx_set_segment(struct kvm_vcpu *vcpu,
			    struct kvm_segment *var, int seg)
{
	struct vcpu_vmx *vmx = to_vmx(vcpu);
	const struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];

	vmx_segment_cache_clear(vmx);

	if (vmx->rmode.vm86_active && seg != VCPU_SREG_LDTR) {
		vmx->rmode.segs[seg] = *var;
		if (seg == VCPU_SREG_TR)
			vmcs_write16(sf->selector, var->selector);
		else if (var->s)
			fix_rmode_seg(seg, &vmx->rmode.segs[seg]);
		goto out;
	}

	vmcs_writel(sf->base, var->base);
	vmcs_write32(sf->limit, var->limit);
	vmcs_write16(sf->selector, var->selector);

	/*
	 *   Fix the "Accessed" bit in AR field of segment registers for older
	 * qemu binaries.
	 *   IA32 arch specifies that at the time of processor reset the
	 * "Accessed" bit in the AR field of segment registers is 1. And qemu
	 * is setting it to 0 in the userland code. This causes invalid guest
	 * state vmexit when "unrestricted guest" mode is turned on.
	 *    Fix for this setup issue in cpu_reset is being pushed in the qemu
	 * tree. Newer qemu binaries with that qemu fix would not need this
	 * kvm hack.
	 */
	if (enable_unrestricted_guest && (seg != VCPU_SREG_LDTR))
		var->type |= 0x1; /* Accessed */

	vmcs_write32(sf->ar_bytes, vmx_segment_access_rights(var));

out:
	vmx->emulation_required = emulation_required(vcpu);
}
Unknown