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601 lines
19 KiB
C
601 lines
19 KiB
C
/******************************************************************************
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* xc_linux_restore.c
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*
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* Restore the state of a Linux session.
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*
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* Copyright (c) 2003, K A Fraser.
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*/
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#include "xc_private.h"
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#include <asm-xen/suspend.h>
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#define MAX_BATCH_SIZE 1024
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#define DEBUG 0
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#if DEBUG
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#define DPRINTF(_f, _a...) printf ( _f , ## _a )
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#else
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#define DPRINTF(_f, _a...) ((void)0)
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#endif
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static int get_pfn_list(int xc_handle,
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u32 domain_id,
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unsigned long *pfn_buf,
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unsigned long max_pfns)
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{
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dom0_op_t op;
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int ret;
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op.cmd = DOM0_GETMEMLIST;
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op.u.getmemlist.domain = (domid_t)domain_id;
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op.u.getmemlist.max_pfns = max_pfns;
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op.u.getmemlist.buffer = pfn_buf;
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if ( mlock(pfn_buf, max_pfns * sizeof(unsigned long)) != 0 )
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{
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PERROR("Could not lock pfn list buffer");
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return -1;
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}
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ret = do_dom0_op(xc_handle, &op);
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(void)munlock(pfn_buf, max_pfns * sizeof(unsigned long));
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return (ret < 0) ? -1 : op.u.getmemlist.num_pfns;
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}
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/** Read the vmconfig string from the state input.
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* It is stored as a 4-byte count 'n' followed by n bytes.
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* The config data is stored in a new string in 'ioctxt->vmconfig',
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* and is null-terminated. The count is stored in 'ioctxt->vmconfig_n'.
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*
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* @param ioctxt i/o context
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* @return 0 on success, non-zero on error.
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*/
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static int read_vmconfig(XcIOContext *ioctxt){
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int err = -1;
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if(xcio_read(ioctxt, &ioctxt->vmconfig_n, sizeof(ioctxt->vmconfig_n))){
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goto exit;
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}
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ioctxt->vmconfig = malloc(ioctxt->vmconfig_n + 1);
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if(!ioctxt->vmconfig) goto exit;
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if(xcio_read(ioctxt, ioctxt->vmconfig, ioctxt->vmconfig_n)){
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goto exit;
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}
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ioctxt->vmconfig[ioctxt->vmconfig_n] = '\0';
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err = 0;
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exit:
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if(err){
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if(ioctxt->vmconfig){
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free(ioctxt->vmconfig);
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}
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ioctxt->vmconfig = NULL;
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ioctxt->vmconfig_n = 0;
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}
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return err;
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}
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int xc_linux_restore(int xc_handle, XcIOContext *ioctxt)
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{
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dom0_op_t op;
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int rc = 1, i, n, k;
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unsigned long mfn, pfn, xpfn;
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unsigned int prev_pc, this_pc;
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u32 dom = ioctxt->domain;
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int verify = 0;
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/* Number of page frames in use by this Linux session. */
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unsigned long nr_pfns;
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/* The new domain's shared-info frame number. */
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unsigned long shared_info_frame;
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unsigned char shared_info[PAGE_SIZE]; /* saved contents from file */
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/* A copy of the CPU context of the guest. */
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full_execution_context_t ctxt;
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/* First 16 bytes of the state file must contain 'LinuxGuestRecord'. */
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char signature[16];
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/* A copy of the domain's name. */
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char name[MAX_DOMAIN_NAME];
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/* A table containg the type of each PFN (/not/ MFN!). */
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unsigned long *pfn_type = NULL;
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/* A table of MFNs to map in the current region */
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unsigned long *region_mfn = NULL;
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/* A temporary mapping, and a copy, of one frame of guest memory. */
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unsigned long *ppage;
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/* A copy of the pfn-to-mfn table frame list. */
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unsigned long pfn_to_mfn_frame_list[1024];
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/* A table mapping each PFN to its new MFN. */
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unsigned long *pfn_to_mfn_table = NULL;
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/* used by mapper for updating the domain's copy of the table */
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unsigned long *live_pfn_to_mfn_table = NULL;
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/* A temporary mapping of the guest's suspend record. */
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suspend_record_t *p_srec;
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char *region_base;
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mmu_t *mmu = NULL;
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int pm_handle = -1;
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/* used by debug verify code */
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unsigned long buf[PAGE_SIZE/sizeof(unsigned long)];
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if ( mlock(&ctxt, sizeof(ctxt) ) ) {
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/* needed for when we do the build dom0 op,
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but might as well do early */
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PERROR("Unable to mlock ctxt");
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return 1;
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}
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/* Start writing out the saved-domain record. */
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if ( xcio_read(ioctxt, signature, 16) ||
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(memcmp(signature, "LinuxGuestRecord", 16) != 0) ) {
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xcio_error(ioctxt, "Unrecognised state format -- no signature found");
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goto out;
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}
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if ( xcio_read(ioctxt, name, sizeof(name)) ||
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xcio_read(ioctxt, &nr_pfns, sizeof(unsigned long)) ||
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xcio_read(ioctxt, pfn_to_mfn_frame_list, PAGE_SIZE) ) {
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xcio_error(ioctxt, "Error reading header");
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goto out;
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}
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if(read_vmconfig(ioctxt)){
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xcio_error(ioctxt, "Error writing vmconfig");
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goto out;
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}
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for ( i = 0; i < MAX_DOMAIN_NAME; i++ ) {
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if ( name[i] == '\0' ) break;
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if ( name[i] & 0x80 )
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{
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xcio_error(ioctxt, "Random characters in domain name");
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goto out;
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}
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}
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name[MAX_DOMAIN_NAME-1] = '\0';
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if ( nr_pfns > 1024*1024 ) {
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xcio_error(ioctxt, "Invalid state file -- pfn count out of range");
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goto out;
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}
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/* We want zeroed memory so use calloc rather than malloc. */
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pfn_to_mfn_table = calloc(1, 4 * nr_pfns);
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pfn_type = calloc(1, 4 * nr_pfns);
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region_mfn = calloc(1, 4 * MAX_BATCH_SIZE);
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if ( (pfn_to_mfn_table == NULL) || (pfn_type == NULL) ||
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(region_mfn == NULL) ) {
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errno = ENOMEM;
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goto out;
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}
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if ( mlock(region_mfn, 4 * MAX_BATCH_SIZE ) ) {
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xcio_error(ioctxt, "Could not mlock region_mfn");
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goto out;
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}
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/* Set the domain's name to that from the restore file */
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if ( xc_domain_setname( xc_handle, dom, name ) ) {
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xcio_error(ioctxt, "Could not set domain name");
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goto out;
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}
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/* Set the domain's initial memory allocation
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to that from the restore file */
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if ( xc_domain_setinitialmem(xc_handle, dom,
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nr_pfns * (PAGE_SIZE / 1024)) )
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{
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xcio_error(ioctxt, "Could not set domain initial memory");
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goto out;
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}
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/* Get the domain's shared-info frame. */
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op.cmd = DOM0_GETDOMAININFO;
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op.u.getdomaininfo.domain = (domid_t)dom;
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op.u.getdomaininfo.ctxt = NULL;
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if ( do_dom0_op(xc_handle, &op) < 0 ) {
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xcio_error(ioctxt, "Could not get information on new domain");
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goto out;
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}
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shared_info_frame = op.u.getdomaininfo.shared_info_frame;
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if ( (pm_handle = init_pfn_mapper((domid_t)dom)) < 0 )
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goto out;
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/* Build the pfn-to-mfn table. We choose MFN ordering returned by Xen. */
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if ( get_pfn_list(xc_handle, dom, pfn_to_mfn_table, nr_pfns) != nr_pfns ) {
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xcio_error(ioctxt, "Did not read correct number of frame numbers for new dom");
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goto out;
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}
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if ( (mmu = init_mmu_updates(xc_handle, dom)) == NULL ) {
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xcio_error(ioctxt, "Could not initialise for MMU updates");
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goto out;
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}
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xcio_info(ioctxt, "Reloading memory pages: 0%%");
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/*
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* Now simply read each saved frame into its new machine frame.
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* We uncanonicalise page tables as we go.
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*/
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prev_pc = 0;
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n=0;
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while(1) {
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int j;
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unsigned long region_pfn_type[MAX_BATCH_SIZE];
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this_pc = (n * 100) / nr_pfns;
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if ( (this_pc - prev_pc) >= 5 ) {
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xcio_info(ioctxt, "\b\b\b\b%3d%%", this_pc);
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prev_pc = this_pc;
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}
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if ( xcio_read(ioctxt, &j, sizeof(int)) ) {
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xcio_error(ioctxt, "Error when reading from state file");
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goto out;
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}
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DPRINTF("batch %d\n",j);
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if ( j == -1 ) {
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verify = 1;
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printf("Entering page verify mode\n");
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continue;
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}
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if ( j == 0 ) break; /* our work here is done */
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if( j > MAX_BATCH_SIZE ) {
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xcio_error(ioctxt, "Max batch size exceeded. Giving up.");
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goto out;
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}
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if ( xcio_read(ioctxt, region_pfn_type, j*sizeof(unsigned long)) ) {
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xcio_error(ioctxt, "Error when reading from state file");
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goto out;
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}
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for(i=0; i<j; i++) {
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if ( (region_pfn_type[i] & LTAB_MASK) == XTAB) {
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region_mfn[i] = 0; /* we know map will fail, but don't care */
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} else {
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pfn = region_pfn_type[i] & ~LTAB_MASK;
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region_mfn[i] = pfn_to_mfn_table[pfn];
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}
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}
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if ( (region_base = mfn_mapper_map_batch( xc_handle, dom,
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PROT_WRITE,
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region_mfn,
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j )) == 0) {
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xcio_error(ioctxt, "map batch failed");
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goto out;
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}
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for(i=0;i<j;i++) {
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unsigned long *ppage;
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pfn = region_pfn_type[i] & ~LTAB_MASK;
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if ( (region_pfn_type[i] & LTAB_MASK) == XTAB) continue;
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if (pfn>nr_pfns) {
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xcio_error(ioctxt, "pfn out of range");
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goto out;
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}
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region_pfn_type[i] &= LTAB_MASK;
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pfn_type[pfn] = region_pfn_type[i];
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mfn = pfn_to_mfn_table[pfn];
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if ( verify ) {
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ppage = (unsigned long*) buf; /* debug case */
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} else {
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ppage = (unsigned long*) (region_base + i*PAGE_SIZE);
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}
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if ( xcio_read(ioctxt, ppage, PAGE_SIZE) ) {
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xcio_error(ioctxt, "Error when reading from state file");
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goto out;
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}
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switch( region_pfn_type[i] ) {
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case 0:
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break;
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case L1TAB:
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{
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for ( k = 0; k < 1024; k++ ) {
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if ( ppage[k] & _PAGE_PRESENT ) {
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xpfn = ppage[k] >> PAGE_SHIFT;
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if ( xpfn >= nr_pfns ) {
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xcio_error(ioctxt, "Frame number in type %lu page table is "
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"out of range. i=%d k=%d pfn=0x%lx "
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"nr_pfns=%lu", region_pfn_type[i]>>28, i,
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k, xpfn, nr_pfns);
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goto out;
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}
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ppage[k] &= (PAGE_SIZE - 1) &
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~(_PAGE_GLOBAL | _PAGE_PAT);
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ppage[k] |= pfn_to_mfn_table[xpfn] << PAGE_SHIFT;
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}
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}
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}
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break;
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case L2TAB:
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{
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for ( k = 0;
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k < (HYPERVISOR_VIRT_START>>L2_PAGETABLE_SHIFT);
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k++ ) {
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if ( ppage[k] & _PAGE_PRESENT ) {
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xpfn = ppage[k] >> PAGE_SHIFT;
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if ( xpfn >= nr_pfns ) {
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xcio_error(ioctxt, "Frame number in type %lu page table is "
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"out of range. i=%d k=%d pfn=%lu nr_pfns=%lu",
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region_pfn_type[i]>>28, i, k, xpfn, nr_pfns);
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goto out;
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}
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ppage[k] &= (PAGE_SIZE - 1) &
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~(_PAGE_GLOBAL | _PAGE_PSE);
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ppage[k] |= pfn_to_mfn_table[xpfn] << PAGE_SHIFT;
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}
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}
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}
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break;
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default:
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xcio_error(ioctxt, "Bogus page type %lx page table is out of range."
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" i=%d nr_pfns=%lu", region_pfn_type[i], i, nr_pfns);
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goto out;
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} /* end of page type switch statement */
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if ( verify ) {
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int res = memcmp(buf, (region_base + i*PAGE_SIZE), PAGE_SIZE );
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if (res) {
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int v;
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printf("************** pfn=%lx type=%lx gotcs=%08lx "
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"actualcs=%08lx\n", pfn, pfn_type[pfn],
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csum_page(region_base + i*PAGE_SIZE),
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csum_page(buf));
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for ( v = 0; v < 4; v++ ) {
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unsigned long *p = (unsigned long *)
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(region_base + i*PAGE_SIZE);
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if ( buf[v] != p[v] )
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printf(" %d: %08lx %08lx\n",
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v, buf[v], p[v] );
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}
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}
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}
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if ( add_mmu_update(xc_handle, mmu,
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(mfn<<PAGE_SHIFT) | MMU_MACHPHYS_UPDATE, pfn) ) {
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printf("machpys mfn=%ld pfn=%ld\n",mfn,pfn);
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goto out;
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}
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} /* end of 'batch' for loop */
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munmap( region_base, j*PAGE_SIZE );
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n+=j; /* crude stats */
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}
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printf("Received all pages\n");
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DPRINTF("Received all pages\n");
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/*
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* Pin page tables. Do this after writing to them as otherwise Xen
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* will barf when doing the type-checking.
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*/
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for ( i = 0; i < nr_pfns; i++ ) {
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if ( pfn_type[i] == L1TAB ) {
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if ( add_mmu_update(xc_handle, mmu,
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(pfn_to_mfn_table[i]<<PAGE_SHIFT) |
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MMU_EXTENDED_COMMAND,
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MMUEXT_PIN_L1_TABLE) ) {
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printf("ERR pin L1 pfn=%lx mfn=%lx\n",
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(unsigned long)i, pfn_to_mfn_table[i]);
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goto out;
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}
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} else if ( pfn_type[i] == L2TAB ) {
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if ( add_mmu_update(xc_handle, mmu,
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(pfn_to_mfn_table[i]<<PAGE_SHIFT) |
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MMU_EXTENDED_COMMAND,
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MMUEXT_PIN_L2_TABLE) ) {
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printf("ERR pin L2 pfn=%lx mfn=%lx\n",
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(unsigned long)i, pfn_to_mfn_table[i]);
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goto out;
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}
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}
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}
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if ( finish_mmu_updates(xc_handle, mmu) ) goto out;
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xcio_info(ioctxt, "\b\b\b\b100%%\nMemory reloaded.\n");
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if ( xcio_read(ioctxt, &ctxt, sizeof(ctxt)) ||
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xcio_read(ioctxt, shared_info, PAGE_SIZE) ) {
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xcio_error(ioctxt, "Error when reading from state file");
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goto out;
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}
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/* Uncanonicalise the suspend-record frame number and poke resume rec. */
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pfn = ctxt.cpu_ctxt.esi;
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if ( (pfn >= nr_pfns) || (pfn_type[pfn] != NOTAB) )
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{
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xcio_error(ioctxt, "Suspend record frame number is bad");
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goto out;
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}
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ctxt.cpu_ctxt.esi = mfn = pfn_to_mfn_table[pfn];
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p_srec = map_pfn_writeable(pm_handle, mfn);
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p_srec->resume_info.nr_pages = nr_pfns;
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p_srec->resume_info.shared_info = shared_info_frame << PAGE_SHIFT;
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p_srec->resume_info.flags = 0;
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unmap_pfn(pm_handle, p_srec);
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/* Uncanonicalise each GDT frame number. */
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if ( ctxt.gdt_ents > 8192 ) {
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xcio_error(ioctxt, "GDT entry count out of range");
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goto out;
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}
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for ( i = 0; i < ctxt.gdt_ents; i += 512 ) {
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pfn = ctxt.gdt_frames[i];
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if ( (pfn >= nr_pfns) || (pfn_type[pfn] != NOTAB) ) {
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xcio_error(ioctxt, "GDT frame number is bad");
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goto out;
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}
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ctxt.gdt_frames[i] = pfn_to_mfn_table[pfn];
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}
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/* Uncanonicalise the page table base pointer. */
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pfn = ctxt.pt_base >> PAGE_SHIFT;
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if ( (pfn >= nr_pfns) || (pfn_type[pfn] != L2TAB) ) {
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printf("PT base is bad. pfn=%lu nr=%lu type=%08lx %08lx\n",
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pfn, nr_pfns, pfn_type[pfn], (unsigned long)L2TAB);
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xcio_error(ioctxt, "PT base is bad.");
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goto out;
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}
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ctxt.pt_base = pfn_to_mfn_table[pfn] << PAGE_SHIFT;
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/* clear any pending events and the selector */
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memset( &(((shared_info_t *)shared_info)->evtchn_pending[0]),
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0, sizeof (((shared_info_t *)shared_info)->evtchn_pending)+
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sizeof(((shared_info_t *)shared_info)->evtchn_pending_sel) );
|
|
|
|
/* Copy saved contents of shared-info page. No checking needed. */
|
|
ppage = map_pfn_writeable(pm_handle, shared_info_frame);
|
|
memcpy(ppage, shared_info, sizeof(shared_info_t));
|
|
unmap_pfn(pm_handle, ppage);
|
|
|
|
|
|
/* Uncanonicalise the pfn-to-mfn table frame-number list. */
|
|
for ( i = 0; i < (nr_pfns+1023)/1024; i++ ) {
|
|
unsigned long pfn, mfn;
|
|
|
|
pfn = pfn_to_mfn_frame_list[i];
|
|
if ( (pfn >= nr_pfns) || (pfn_type[pfn] != NOTAB) ) {
|
|
xcio_error(ioctxt, "PFN-to-MFN frame number is bad");
|
|
goto out;
|
|
}
|
|
mfn = pfn_to_mfn_table[pfn];
|
|
pfn_to_mfn_frame_list[i] = mfn;
|
|
}
|
|
|
|
if ( (live_pfn_to_mfn_table =
|
|
mfn_mapper_map_batch(xc_handle, dom,
|
|
PROT_WRITE,
|
|
pfn_to_mfn_frame_list,
|
|
(nr_pfns+1023)/1024 )) == 0 ) {
|
|
xcio_error(ioctxt, "Couldn't map pfn_to_mfn table");
|
|
goto out;
|
|
}
|
|
|
|
memcpy( live_pfn_to_mfn_table, pfn_to_mfn_table,
|
|
nr_pfns*sizeof(unsigned long) );
|
|
|
|
munmap( live_pfn_to_mfn_table, ((nr_pfns+1023)/1024)*PAGE_SIZE );
|
|
|
|
/*
|
|
* Safety checking of saved context:
|
|
* 1. cpu_ctxt is fine, as Xen checks that on context switch.
|
|
* 2. fpu_ctxt is fine, as it can't hurt Xen.
|
|
* 3. trap_ctxt needs the code selectors checked.
|
|
* 4. fast_trap_idx is checked by Xen.
|
|
* 5. ldt base must be page-aligned, no more than 8192 ents, ...
|
|
* 6. gdt already done, and further checking is done by Xen.
|
|
* 7. check that guestos_ss is safe.
|
|
* 8. pt_base is already done.
|
|
* 9. debugregs are checked by Xen.
|
|
* 10. callback code selectors need checking.
|
|
*/
|
|
for ( i = 0; i < 256; i++ ) {
|
|
ctxt.trap_ctxt[i].vector = i;
|
|
if ( (ctxt.trap_ctxt[i].cs & 3) == 0 )
|
|
ctxt.trap_ctxt[i].cs = FLAT_GUESTOS_CS;
|
|
}
|
|
if ( (ctxt.guestos_ss & 3) == 0 ){
|
|
ctxt.guestos_ss = FLAT_GUESTOS_DS;
|
|
}
|
|
if ( (ctxt.event_callback_cs & 3) == 0 ){
|
|
ctxt.event_callback_cs = FLAT_GUESTOS_CS;
|
|
}
|
|
if ( (ctxt.failsafe_callback_cs & 3) == 0 ){
|
|
ctxt.failsafe_callback_cs = FLAT_GUESTOS_CS;
|
|
}
|
|
if ( ((ctxt.ldt_base & (PAGE_SIZE - 1)) != 0) ||
|
|
(ctxt.ldt_ents > 8192) ||
|
|
(ctxt.ldt_base > HYPERVISOR_VIRT_START) ||
|
|
((ctxt.ldt_base + ctxt.ldt_ents*8) > HYPERVISOR_VIRT_START) )
|
|
{
|
|
xcio_error(ioctxt, "Bad LDT base or size");
|
|
goto out;
|
|
}
|
|
|
|
op.cmd = DOM0_BUILDDOMAIN;
|
|
op.u.builddomain.domain = (domid_t)dom;
|
|
op.u.builddomain.ctxt = &ctxt;
|
|
rc = do_dom0_op(xc_handle, &op);
|
|
|
|
/* don't start the domain as we have console etc to set up */
|
|
|
|
if( rc == 0 ) {
|
|
/* Success: print the domain id. */
|
|
xcio_info(ioctxt, "DOM=%lu\n", dom);
|
|
return 0;
|
|
}
|
|
|
|
|
|
out:
|
|
if ( (rc != 0) && (dom != 0) ){
|
|
xc_domain_destroy(xc_handle, dom);
|
|
}
|
|
if ( mmu != NULL ){
|
|
free(mmu);
|
|
}
|
|
if ( pm_handle >= 0 ){
|
|
(void)close_pfn_mapper(pm_handle);
|
|
}
|
|
if ( pfn_to_mfn_table != NULL ){
|
|
free(pfn_to_mfn_table);
|
|
}
|
|
if ( pfn_type != NULL ){
|
|
free(pfn_type);
|
|
}
|
|
|
|
if ( rc == 0 ){
|
|
ioctxt->domain = dom;
|
|
}
|
|
DPRINTF("Restore exit with rc=%d\n",rc);
|
|
return rc;
|
|
}
|