[Xen-devel] One question on MMIO

["Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>]

In sh_page_fault(), there are some code like following, why we think it is mmio only when paging_vcpu_mode_translate(v)?

Thanks

Yunhong Jiang  

    /* What mfn is the guest trying to access? */

    gfn = guest_l1e_get_gfn(gw.eff_l1e);

    gmfn = vcpu_gfn_to_mfn(v, gfn);

    mmio = (is_hvm_domain(d)

            && paging_vcpu_mode_translate(v)

            && mmio_space(gfn_to_paddr(gfn)));

    if ( !mmio && !mfn_valid(gmfn) )

    {

        perfc_incr(shadow_fault_bail_bad_gfn);

        SHADOW_PRINTK("BAD gfn=%"SH_PRI_gfn" gmfn=%"PRI_mfn"\n",

                      gfn_x(gfn), mfn_x(gmfn));

        goto not_a_shadow_fault;

}

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