xen_set_mem_access

/*
* Event control functions
*/
status_t xen_set_mem_access(vmi_instance_t vmi, addr_t gpfn,
                            vmi_mem_access_t page_access_flag, uint16_t altp2m_idx)
{
    int rc;
    xenmem_access_t access;
    xen_instance_t *xen = xen_get_instance(vmi);
    xc_interface * xch = xen_get_xchandle(vmi);
    domid_t dom = xen_get_domainid(vmi);
 
#ifdef ENABLE_SAFETY_CHECKS
    if ( !xch ) {
        errprint("%s error: invalid xc_interface handle\n", __FUNCTION__);
        return VMI_FAILURE;
    }
    if ( dom == (domid_t)VMI_INVALID_DOMID ) {
        errprint("%s error: invalid domid\n", __FUNCTION__);
        return VMI_FAILURE;
    }
#endif
 
    if ( VMI_FAILURE == convert_vmi_flags_to_xenmem(page_access_flag, &access) )
        return VMI_FAILURE;
 
    if ( !altp2m_idx )
        rc = xen->libxcw.xc_set_mem_access(xch, dom, access, gpfn, 1); // 1 page at a time
    else
        rc = xen->libxcw.xc_altp2m_set_mem_access(xch, dom, altp2m_idx, gpfn, access);
 
    if (rc) {
        errprint("xc_hvm_set_mem_access failed with code: %d\n", rc);
        return VMI_FAILURE;
    }
    dbprint(VMI_DEBUG_XEN, "--Done Setting memaccess on GPFN: %"PRIu64"\n", gpfn);
    return VMI_SUCCESS;
}

---

🌱 Back to Garden