static int xc_linux_build_internal(struct xc_dom_image *dom,
xc_interface *xch, uint32_t domid,
unsigned int mem_mb,
unsigned long flags,
unsigned int store_evtchn,
unsigned long *store_mfn,
unsigned int console_evtchn,
unsigned long *console_mfn)
{
int rc;
dom->flags = flags;
dom->console_evtchn = console_evtchn;
dom->xenstore_evtchn = store_evtchn;
if ( (rc = xc_dom_boot_xen_init(dom, xch, domid)) != 0 )
goto out;
if ( (rc = xc_dom_parse_image(dom)) != 0 )
goto out;
if ( (rc = xc_dom_mem_init(dom, mem_mb)) != 0 )
goto out;
if ( (rc = xc_dom_boot_mem_init(dom)) != 0 )
goto out;
if ( (rc = xc_dom_build_image(dom)) != 0 )
goto out;
if ( (rc = xc_dom_boot_image(dom)) != 0 )
goto out;
if ( (rc = xc_dom_gnttab_init(dom)) != 0)
goto out;
*console_mfn = xc_dom_p2m_host(dom, dom->console_pfn);
*store_mfn = xc_dom_p2m_host(dom, dom->xenstore_pfn);
out:
return rc;
}
void kexec(void *kernel, long kernel_size, void *module, long module_size, char *cmdline, unsigned long flags)
{
struct xc_dom_image *dom;
int rc;
domid_t domid = DOMID_SELF;
xen_pfn_t pfn;
xc_interface *xc_handle;
unsigned long i;
void *seg;
xen_pfn_t boot_page_mfn = virt_to_mfn(&_boot_page);
char features[] = "";
struct mmu_update *m2p_updates;
unsigned long nr_m2p_updates;
DEBUG("booting with cmdline %s\n", cmdline);
xc_handle = xc_interface_open(0,0,0);
dom = xc_dom_allocate(xc_handle, cmdline, features);
dom->allocate = kexec_allocate;
/* We are using guest owned memory, therefore no limits. */
xc_dom_kernel_max_size(dom, 0);
xc_dom_ramdisk_max_size(dom, 0);
dom->kernel_blob = kernel;
dom->kernel_size = kernel_size;
dom->ramdisk_blob = module;
dom->ramdisk_size = module_size;
dom->flags = flags;
dom->console_evtchn = start_info.console.domU.evtchn;
dom->xenstore_evtchn = start_info.store_evtchn;
tpm_hash2pcr(dom, cmdline);
if ( (rc = xc_dom_boot_xen_init(dom, xc_handle, domid)) != 0 ) {
grub_printf("xc_dom_boot_xen_init returned %d\n", rc);
errnum = ERR_BOOT_FAILURE;
goto out;
}
if ( (rc = xc_dom_parse_image(dom)) != 0 ) {
grub_printf("xc_dom_parse_image returned %d\n", rc);
errnum = ERR_BOOT_FAILURE;
goto out;
}
#ifdef __i386__
if (strcmp(dom->guest_type, "xen-3.0-x86_32p")) {
grub_printf("can only boot x86 32 PAE kernels, not %s\n", dom->guest_type);
errnum = ERR_EXEC_FORMAT;
goto out;
}
#endif
#ifdef __x86_64__
if (strcmp(dom->guest_type, "xen-3.0-x86_64")) {
grub_printf("can only boot x86 64 kernels, not %s\n", dom->guest_type);
errnum = ERR_EXEC_FORMAT;
goto out;
}
#endif
/* equivalent of xc_dom_mem_init */
dom->arch_hooks = xc_dom_find_arch_hooks(xc_handle, dom->guest_type);
dom->total_pages = start_info.nr_pages;
/* equivalent of arch_setup_meminit */
/* setup initial p2m */
dom->p2m_host = malloc(sizeof(*dom->p2m_host) * dom->total_pages);
/* Start with our current P2M */
for (i = 0; i < dom->total_pages; i++)
dom->p2m_host[i] = pfn_to_mfn(i);
if ( (rc = xc_dom_build_image(dom)) != 0 ) {
grub_printf("xc_dom_build_image returned %d\n", rc);
errnum = ERR_BOOT_FAILURE;
goto out;
}
/* copy hypercall page */
/* TODO: domctl instead, but requires privileges */
if (dom->parms.virt_hypercall != -1) {
pfn = PHYS_PFN(dom->parms.virt_hypercall - dom->parms.virt_base);
memcpy((void *) pages[pfn], hypercall_page, PAGE_SIZE);
}
/* Equivalent of xc_dom_boot_image */
dom->shared_info_mfn = PHYS_PFN(start_info.shared_info);
if (!xc_dom_compat_check(dom)) {
grub_printf("xc_dom_compat_check failed\n");
errnum = ERR_EXEC_FORMAT;
goto out;
}
/* Move current console, xenstore and boot MFNs to the allocated place */
do_exchange(dom, dom->console_pfn, start_info.console.domU.mfn);
do_exchange(dom, dom->xenstore_pfn, start_info.store_mfn);
DEBUG("virt base at %llx\n", dom->parms.virt_base);
DEBUG("bootstack_pfn %lx\n", dom->bootstack_pfn);
_boot_target = dom->parms.virt_base + PFN_PHYS(dom->bootstack_pfn);
DEBUG("_boot_target %lx\n", _boot_target);
do_exchange(dom, PHYS_PFN(_boot_target - dom->parms.virt_base),
virt_to_mfn(&_boot_page));
/* Make sure the bootstrap page table does not RW-map any of our current
* page table frames */
kexec_allocate(dom, dom->virt_pgtab_end);
if ( (rc = xc_dom_update_guest_p2m(dom))) {
grub_printf("xc_dom_update_guest_p2m returned %d\n", rc);
errnum = ERR_BOOT_FAILURE;
goto out;
}
if ( dom->arch_hooks->setup_pgtables )
if ( (rc = dom->arch_hooks->setup_pgtables(dom))) {
grub_printf("setup_pgtables returned %d\n", rc);
errnum = ERR_BOOT_FAILURE;
goto out;
}
/* start info page */
#undef start_info
if ( dom->arch_hooks->start_info )
dom->arch_hooks->start_info(dom);
#define start_info (start_info_union.start_info)
xc_dom_log_memory_footprint(dom);
/* Unmap libxc's projection of the boot page table */
seg = xc_dom_seg_to_ptr(dom, &dom->pgtables_seg);
munmap(seg, dom->pgtables_seg.vend - dom->pgtables_seg.vstart);
/* Unmap day0 pages to avoid having a r/w mapping of the future page table */
for (pfn = 0; pfn < allocated; pfn++)
munmap((void*) pages[pfn], PAGE_SIZE);
/* Pin the boot page table base */
if ( (rc = pin_table(dom->xch,
#ifdef __i386__
MMUEXT_PIN_L3_TABLE,
#endif
#ifdef __x86_64__
MMUEXT_PIN_L4_TABLE,
#endif
xc_dom_p2m_host(dom, dom->pgtables_seg.pfn),
dom->guest_domid)) != 0 ) {
grub_printf("pin_table(%lx) returned %d\n", xc_dom_p2m_host(dom,
dom->pgtables_seg.pfn), rc);
errnum = ERR_BOOT_FAILURE;
goto out_remap;
}
/* We populate the Mini-OS page table here so that boot.S can just call
* update_va_mapping to project itself there. */
need_pgt(_boot_target);
DEBUG("day0 pages %lx\n", allocated);
DEBUG("boot target page %lx\n", _boot_target);
DEBUG("boot page %p\n", &_boot_page);
DEBUG("boot page mfn %lx\n", boot_page_mfn);
_boot_page_entry = PFN_PHYS(boot_page_mfn) | L1_PROT;
DEBUG("boot page entry %llx\n", _boot_page_entry);
_boot_oldpdmfn = virt_to_mfn(start_info.pt_base);
DEBUG("boot old pd mfn %lx\n", _boot_oldpdmfn);
DEBUG("boot pd virt %lx\n", dom->pgtables_seg.vstart);
_boot_pdmfn = dom->p2m_host[PHYS_PFN(dom->pgtables_seg.vstart - dom->parms.virt_base)];
DEBUG("boot pd mfn %lx\n", _boot_pdmfn);
_boot_stack = _boot_target + PAGE_SIZE;
DEBUG("boot stack %lx\n", _boot_stack);
_boot_start_info = dom->parms.virt_base + PFN_PHYS(dom->start_info_pfn);
DEBUG("boot start info %lx\n", _boot_start_info);
_boot_start = dom->parms.virt_entry;
DEBUG("boot start %lx\n", _boot_start);
/* Keep only useful entries */
for (nr_m2p_updates = pfn = 0; pfn < start_info.nr_pages; pfn++)
if (dom->p2m_host[pfn] != pfn_to_mfn(pfn))
nr_m2p_updates++;
m2p_updates = malloc(sizeof(*m2p_updates) * nr_m2p_updates);
for (i = pfn = 0; pfn < start_info.nr_pages; pfn++)
if (dom->p2m_host[pfn] != pfn_to_mfn(pfn)) {
m2p_updates[i].ptr = PFN_PHYS(dom->p2m_host[pfn]) | MMU_MACHPHYS_UPDATE;
m2p_updates[i].val = pfn;
i++;
}
for (i = 0; i < blk_nb; i++)
shutdown_blkfront(blk_dev[i]);
if (net_dev)
shutdown_netfront(net_dev);
if (kbd_dev)
shutdown_kbdfront(kbd_dev);
stop_kernel();
/* Update M2P */
if ((rc = HYPERVISOR_mmu_update(m2p_updates, nr_m2p_updates, NULL, DOMID_SELF)) < 0) {
xprintk("Could not update M2P\n");
ASSERT(0);
}
xprintk("go!\n");
/* Jump to trampoline boot page */
_boot();
ASSERT(0);
out_remap:
for (pfn = 0; pfn < allocated; pfn++)
do_map_frames(pages[pfn], &pages_mfns[pfn], 1, 0, 0, DOMID_SELF, 0, L1_PROT);
out:
xc_dom_release(dom);
for (pfn = 0; pfn < allocated; pfn++)
free_page((void*)pages[pfn]);
free(pages);
free(pages_mfns);
pages = NULL;
pages_mfns = NULL;
allocated = 0;
xc_interface_close(xc_handle );
}
static int build(xc_interface *xch)
{
char cmdline[512];
uint32_t ssid;
xen_domain_handle_t handle = { 0 };
int rv, xs_fd;
struct xc_dom_image *dom = NULL;
int limit_kb = (memory + 1) * 1024;
xs_fd = open("/dev/xen/xenbus_backend", O_RDWR);
if ( xs_fd == -1 )
{
fprintf(stderr, "Could not open /dev/xen/xenbus_backend\n");
return -1;
}
if ( flask )
{
rv = xc_flask_context_to_sid(xch, flask, strlen(flask), &ssid);
if ( rv )
{
fprintf(stderr, "xc_flask_context_to_sid failed\n");
goto err;
}
}
else
{
ssid = SECINITSID_DOMU;
}
rv = xc_domain_create(xch, ssid, handle, XEN_DOMCTL_CDF_xs_domain,
&domid, NULL);
if ( rv )
{
fprintf(stderr, "xc_domain_create failed\n");
goto err;
}
rv = xc_domain_max_vcpus(xch, domid, 1);
if ( rv )
{
fprintf(stderr, "xc_domain_max_vcpus failed\n");
goto err;
}
rv = xc_domain_setmaxmem(xch, domid, limit_kb);
if ( rv )
{
fprintf(stderr, "xc_domain_setmaxmem failed\n");
goto err;
}
rv = xc_domain_set_memmap_limit(xch, domid, limit_kb);
if ( rv )
{
fprintf(stderr, "xc_domain_set_memmap_limit failed\n");
goto err;
}
rv = ioctl(xs_fd, IOCTL_XENBUS_BACKEND_SETUP, domid);
if ( rv < 0 )
{
fprintf(stderr, "Xenbus setup ioctl failed\n");
goto err;
}
if ( param )
snprintf(cmdline, 512, "--event %d --internal-db %s", rv, param);
else
snprintf(cmdline, 512, "--event %d --internal-db", rv);
dom = xc_dom_allocate(xch, cmdline, NULL);
rv = xc_dom_kernel_file(dom, kernel);
if ( rv )
{
fprintf(stderr, "xc_dom_kernel_file failed\n");
goto err;
}
if ( ramdisk )
{
rv = xc_dom_ramdisk_file(dom, ramdisk);
if ( rv )
{
fprintf(stderr, "xc_dom_ramdisk_file failed\n");
goto err;
}
}
rv = xc_dom_boot_xen_init(dom, xch, domid);
if ( rv )
{
fprintf(stderr, "xc_dom_boot_xen_init failed\n");
goto err;
}
rv = xc_dom_parse_image(dom);
if ( rv )
{
fprintf(stderr, "xc_dom_parse_image failed\n");
goto err;
}
rv = xc_dom_mem_init(dom, memory);
if ( rv )
{
fprintf(stderr, "xc_dom_mem_init failed\n");
goto err;
}
rv = xc_dom_boot_mem_init(dom);
if ( rv )
{
fprintf(stderr, "xc_dom_boot_mem_init failed\n");
goto err;
}
rv = xc_dom_build_image(dom);
if ( rv )
{
fprintf(stderr, "xc_dom_build_image failed\n");
goto err;
}
rv = xc_dom_boot_image(dom);
if ( rv )
{
fprintf(stderr, "xc_dom_boot_image failed\n");
goto err;
}
rv = xc_domain_set_virq_handler(xch, domid, VIRQ_DOM_EXC);
if ( rv )
{
fprintf(stderr, "xc_domain_set_virq_handler failed\n");
goto err;
}
rv = xc_domain_unpause(xch, domid);
if ( rv )
{
fprintf(stderr, "xc_domain_unpause failed\n");
goto err;
}
rv = 0;
err:
if ( dom )
xc_dom_release(dom);
if ( xs_fd >= 0 )
close(xs_fd);
/* if we failed then destroy the domain */
if ( rv && domid != ~0 )
xc_domain_destroy(xch, domid);
return rv;
}
