/****************************************************************************** * xc_linux_save.c * * Save the state of a running Linux session. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; * version 2.1 of the License. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * Copyright (c) 2003, K A Fraser. */ #include #include #include #include #include #include "xc_private.h" #include "xc_dom.h" #include "xg_private.h" #include "xg_save_restore.h" #include #include "xc_e820.h" /* ** Default values for important tuning parameters. Can override by passing ** non-zero replacement values to xc_domain_save(). ** ** XXX SMH: should consider if want to be able to override MAX_MBIT_RATE too. ** */ #define DEF_MAX_ITERS 29 /* limit us to 30 times round loop */ #define DEF_MAX_FACTOR 3 /* never send more than 3x p2m_size */ struct save_ctx { unsigned long hvirt_start; /* virtual starting address of the hypervisor */ unsigned int pt_levels; /* #levels of page tables used by the current guest */ unsigned long max_mfn; /* max mfn of the whole machine */ xen_pfn_t *live_p2m; /* Live mapping of the table mapping each PFN to its current MFN. */ xen_pfn_t *live_m2p; /* Live mapping of system MFN to PFN table. */ unsigned long m2p_mfn0; struct domain_info_context dinfo; }; /* buffer for output */ struct outbuf { void* buf; size_t size; size_t pos; }; #define OUTBUF_SIZE (16384 * 1024) /* grep fodder: machine_to_phys */ #define mfn_to_pfn(_mfn) (ctx->live_m2p[(_mfn)]) #define pfn_to_mfn(_pfn) \ ((xen_pfn_t) ((dinfo->guest_width==8) \ ? (((uint64_t *)ctx->live_p2m)[(_pfn)]) \ : ((((uint32_t *)ctx->live_p2m)[(_pfn)]) == 0xffffffffU \ ? (-1UL) : (((uint32_t *)ctx->live_p2m)[(_pfn)])))) /* * Returns TRUE if the given machine frame number has a unique mapping * in the guest's pseudophysical map. */ #define MFN_IS_IN_PSEUDOPHYS_MAP(_mfn) \ (((_mfn) < (ctx->max_mfn)) && \ ((mfn_to_pfn(_mfn) < (dinfo->p2m_size)) && \ (pfn_to_mfn(mfn_to_pfn(_mfn)) == (_mfn)))) /* ** During (live) save/migrate, we maintain a number of bitmaps to track ** which pages we have to send, to fixup, and to skip. */ #define BITS_PER_LONG (sizeof(unsigned long) * 8) #define BITS_TO_LONGS(bits) (((bits)+BITS_PER_LONG-1)/BITS_PER_LONG) #define BITMAP_SIZE (BITS_TO_LONGS(dinfo->p2m_size) * sizeof(unsigned long)) #define BITMAP_ENTRY(_nr,_bmap) \ ((volatile unsigned long *)(_bmap))[(_nr)/BITS_PER_LONG] #define BITMAP_SHIFT(_nr) ((_nr) % BITS_PER_LONG) #define ORDER_LONG (sizeof(unsigned long) == 4 ? 5 : 6) static inline int test_bit (int nr, volatile void * addr) { return (BITMAP_ENTRY(nr, addr) >> BITMAP_SHIFT(nr)) & 1; } static inline void clear_bit (int nr, volatile void * addr) { BITMAP_ENTRY(nr, addr) &= ~(1UL << BITMAP_SHIFT(nr)); } static inline void set_bit ( int nr, volatile void * addr) { BITMAP_ENTRY(nr, addr) |= (1UL << BITMAP_SHIFT(nr)); } /* Returns the hamming weight (i.e. the number of bits set) in a N-bit word */ static inline unsigned int hweight32(unsigned int w) { unsigned int res = (w & 0x55555555) + ((w >> 1) & 0x55555555); res = (res & 0x33333333) + ((res >> 2) & 0x33333333); res = (res & 0x0F0F0F0F) + ((res >> 4) & 0x0F0F0F0F); res = (res & 0x00FF00FF) + ((res >> 8) & 0x00FF00FF); return (res & 0x0000FFFF) + ((res >> 16) & 0x0000FFFF); } static inline int count_bits ( int nr, volatile void *addr) { int i, count = 0; volatile unsigned long *p = (volatile unsigned long *)addr; /* We know that the array is padded to unsigned long. */ for ( i = 0; i < (nr / (sizeof(unsigned long)*8)); i++, p++ ) count += hweight32(*p); return count; } static uint64_t tv_to_us(struct timeval *new) { return (new->tv_sec * 1000000) + new->tv_usec; } static uint64_t llgettimeofday(void) { struct timeval now; gettimeofday(&now, NULL); return tv_to_us(&now); } static uint64_t tv_delta(struct timeval *new, struct timeval *old) { return (((new->tv_sec - old->tv_sec)*1000000) + (new->tv_usec - old->tv_usec)); } static int noncached_write(xc_interface *xch, int fd, int live, void *buffer, int len) { static int write_count = 0; int rc = (write_exact(fd, buffer, len) == 0) ? len : -1; write_count += len; if ( write_count >= (MAX_PAGECACHE_USAGE * PAGE_SIZE) ) { /* Time to discard cache - dont care if this fails */ int saved_errno = errno; discard_file_cache(xch, fd, 0 /* no flush */); errno = saved_errno; write_count = 0; } return rc; } static int outbuf_init(xc_interface *xch, struct outbuf* ob, size_t size) { memset(ob, 0, sizeof(*ob)); if ( !(ob->buf = malloc(size)) ) { DPRINTF("error allocating output buffer of size %zu\n", size); return -1; } ob->size = size; return 0; } static inline int outbuf_write(xc_interface *xch, struct outbuf* ob, void* buf, size_t len) { if ( len > ob->size - ob->pos ) { DBGPRINTF("outbuf_write: %zu > %zu@%zu\n", len, ob->size - ob->pos, ob->pos); return -1; } memcpy(ob->buf + ob->pos, buf, len); ob->pos += len; return 0; } /* prep for nonblocking I/O */ static int outbuf_flush(xc_interface *xch, struct outbuf* ob, int fd) { int rc; int cur = 0; if ( !ob->pos ) return 0; rc = write(fd, ob->buf, ob->pos); while (rc < 0 || cur + rc < ob->pos) { if (rc < 0 && errno != EAGAIN && errno != EINTR) { DPRINTF("error flushing output: %d\n", errno); return -1; } if (rc > 0) cur += rc; rc = write(fd, ob->buf + cur, ob->pos - cur); } ob->pos = 0; return 0; } /* if there's no room in the buffer, flush it and try again. */ static inline int outbuf_hardwrite(xc_interface *xch, struct outbuf* ob, int fd, void* buf, size_t len) { if ( !len ) return 0; if ( !outbuf_write(xch, ob, buf, len) ) return 0; if ( outbuf_flush(xch, ob, fd) < 0 ) return -1; return outbuf_write(xch, ob, buf, len); } /* start buffering output once we've reached checkpoint mode. */ static inline int write_buffer(xc_interface *xch, int dobuf, struct outbuf* ob, int fd, void* buf, size_t len) { if ( dobuf ) return outbuf_hardwrite(xch, ob, fd, buf, len); else return write_exact(fd, buf, len); } #ifdef ADAPTIVE_SAVE /* ** We control the rate at which we transmit (or save) to minimize impact ** on running domains (including the target if we're doing live migrate). */ #define MAX_MBIT_RATE 500 /* maximum transmit rate for migrate */ #define START_MBIT_RATE 100 /* initial transmit rate for migrate */ /* Scaling factor to convert between a rate (in Mb/s) and time (in usecs) */ #define RATE_TO_BTU 781250 /* Amount in bytes we allow ourselves to send in a burst */ #define BURST_BUDGET (100*1024) /* We keep track of the current and previous transmission rate */ static int mbit_rate, ombit_rate = 0; /* Have we reached the maximum transmission rate? */ #define RATE_IS_MAX() (mbit_rate == MAX_MBIT_RATE) static inline void initialize_mbit_rate() { mbit_rate = START_MBIT_RATE; } static int ratewrite(xc_interface *xch, int io_fd, int live, void *buf, int n) { static int budget = 0; static int burst_time_us = -1; static struct timeval last_put = { 0 }; struct timeval now; struct timespec delay; long long delta; if ( START_MBIT_RATE == 0 ) return noncached_write(io_fd, live, buf, n); budget -= n; if ( budget < 0 ) { if ( mbit_rate != ombit_rate ) { burst_time_us = RATE_TO_BTU / mbit_rate; ombit_rate = mbit_rate; DPRINTF("rate limit: %d mbit/s burst budget %d slot time %d\n", mbit_rate, BURST_BUDGET, burst_time_us); } if ( last_put.tv_sec == 0 ) { budget += BURST_BUDGET; gettimeofday(&last_put, NULL); } else { while ( budget < 0 ) { gettimeofday(&now, NULL); delta = tv_delta(&now, &last_put); while ( delta > burst_time_us ) { budget += BURST_BUDGET; last_put.tv_usec += burst_time_us; if ( last_put.tv_usec > 1000000 ) { last_put.tv_usec -= 1000000; last_put.tv_sec++; } delta -= burst_time_us; } if ( budget > 0 ) break; delay.tv_sec = 0; delay.tv_nsec = 1000 * (burst_time_us - delta); while ( delay.tv_nsec > 0 ) if ( nanosleep(&delay, &delay) == 0 ) break; } } } return noncached_write(io_fd, live, buf, n); } #else /* ! ADAPTIVE SAVE */ #define RATE_IS_MAX() (0) #define ratewrite(xch, _io_fd, _live, _buf, _n) noncached_write((xch), (_io_fd), (_live), (_buf), (_n)) #define initialize_mbit_rate() #endif /* like write_buffer for ratewrite, which returns number of bytes written */ static inline int ratewrite_buffer(xc_interface *xch, int dobuf, struct outbuf* ob, int fd, int live, void* buf, size_t len) { if ( dobuf ) return outbuf_hardwrite(xch, ob, fd, buf, len) ? -1 : len; else return ratewrite(xch, fd, live, buf, len); } static int print_stats(xc_interface *xch, uint32_t domid, int pages_sent, xc_shadow_op_stats_t *stats, int print) { static struct timeval wall_last; static long long d0_cpu_last; static long long d1_cpu_last; struct timeval wall_now; long long wall_delta; long long d0_cpu_now, d0_cpu_delta; long long d1_cpu_now, d1_cpu_delta; gettimeofday(&wall_now, NULL); d0_cpu_now = xc_domain_get_cpu_usage(xch, 0, /* FIXME */ 0)/1000; d1_cpu_now = xc_domain_get_cpu_usage(xch, domid, /* FIXME */ 0)/1000; if ( (d0_cpu_now == -1) || (d1_cpu_now == -1) ) DPRINTF("ARRHHH!!\n"); wall_delta = tv_delta(&wall_now,&wall_last)/1000; if ( wall_delta == 0 ) wall_delta = 1; d0_cpu_delta = (d0_cpu_now - d0_cpu_last)/1000; d1_cpu_delta = (d1_cpu_now - d1_cpu_last)/1000; if ( print ) DPRINTF("delta %lldms, dom0 %d%%, target %d%%, sent %dMb/s, " "dirtied %dMb/s %" PRId32 " pages\n", wall_delta, (int)((d0_cpu_delta*100)/wall_delta), (int)((d1_cpu_delta*100)/wall_delta), (int)((pages_sent*PAGE_SIZE)/(wall_delta*(1000/8))), (int)((stats->dirty_count*PAGE_SIZE)/(wall_delta*(1000/8))), stats->dirty_count); #ifdef ADAPTIVE_SAVE if ( ((stats->dirty_count*PAGE_SIZE)/(wall_delta*(1000/8))) > mbit_rate ) { mbit_rate = (int)((stats->dirty_count*PAGE_SIZE)/(wall_delta*(1000/8))) + 50; if ( mbit_rate > MAX_MBIT_RATE ) mbit_rate = MAX_MBIT_RATE; } #endif d0_cpu_last = d0_cpu_now; d1_cpu_last = d1_cpu_now; wall_last = wall_now; return 0; } static int analysis_phase(xc_interface *xch, uint32_t domid, struct save_ctx *ctx, xc_hypercall_buffer_t *arr, int runs) { long long start, now; xc_shadow_op_stats_t stats; int j; struct domain_info_context *dinfo = &ctx->dinfo; start = llgettimeofday(); for ( j = 0; j < runs; j++ ) { int i; xc_shadow_control(xch, domid, XEN_DOMCTL_SHADOW_OP_CLEAN, arr, dinfo->p2m_size, NULL, 0, NULL); DPRINTF("#Flush\n"); for ( i = 0; i < 40; i++ ) { usleep(50000); now = llgettimeofday(); xc_shadow_control(xch, domid, XEN_DOMCTL_SHADOW_OP_PEEK, NULL, 0, NULL, 0, &stats); DPRINTF("now= %lld faults= %"PRId32" dirty= %"PRId32"\n", ((now-start)+500)/1000, stats.fault_count, stats.dirty_count); } } return -1; } static int suspend_and_state(int (*suspend)(void*), void* data, xc_interface *xch, int io_fd, int dom, xc_dominfo_t *info) { if ( !(*suspend)(data) ) { ERROR("Suspend request failed"); return -1; } if ( (xc_domain_getinfo(xch, dom, 1, info) != 1) || !info->shutdown || (info->shutdown_reason != SHUTDOWN_suspend) ) { ERROR("Domain not in suspended state"); return -1; } return 0; } /* ** Map the top-level page of MFNs from the guest. The guest might not have ** finished resuming from a previous restore operation, so we wait a while for ** it to update the MFN to a reasonable value. */ static void *map_frame_list_list(xc_interface *xch, uint32_t dom, struct save_ctx *ctx, shared_info_any_t *shinfo) { int count = 100; void *p; struct domain_info_context *dinfo = &ctx->dinfo; uint64_t fll = GET_FIELD(shinfo, arch.pfn_to_mfn_frame_list_list); while ( count-- && (fll == 0) ) { usleep(10000); fll = GET_FIELD(shinfo, arch.pfn_to_mfn_frame_list_list); } if ( fll == 0 ) { ERROR("Timed out waiting for frame list updated."); return NULL; } p = xc_map_foreign_range(xch, dom, PAGE_SIZE, PROT_READ, fll); if ( p == NULL ) PERROR("Couldn't map p2m_frame_list_list (errno %d)", errno); return p; } /* ** During transfer (or in the state file), all page-table pages must be ** converted into a 'canonical' form where references to actual mfns ** are replaced with references to the corresponding pfns. ** ** This function performs the appropriate conversion, taking into account ** which entries do not require canonicalization (in particular, those ** entries which map the virtual address reserved for the hypervisor). */ static int canonicalize_pagetable(struct save_ctx *ctx, unsigned long type, unsigned long pfn, const void *spage, void *dpage) { struct domain_info_context *dinfo = &ctx->dinfo; int i, pte_last, xen_start, xen_end, race = 0; uint64_t pte; /* ** We need to determine which entries in this page table hold ** reserved hypervisor mappings. This depends on the current ** page table type as well as the number of paging levels. */ xen_start = xen_end = pte_last = PAGE_SIZE / ((ctx->pt_levels == 2) ? 4 : 8); if ( (ctx->pt_levels == 2) && (type == XEN_DOMCTL_PFINFO_L2TAB) ) xen_start = (ctx->hvirt_start >> L2_PAGETABLE_SHIFT); if ( (ctx->pt_levels == 3) && (type == XEN_DOMCTL_PFINFO_L3TAB) ) xen_start = L3_PAGETABLE_ENTRIES_PAE; /* ** In PAE only the L2 mapping the top 1GB contains Xen mappings. ** We can spot this by looking for the guest's mappingof the m2p. ** Guests must ensure that this check will fail for other L2s. */ if ( (ctx->pt_levels == 3) && (type == XEN_DOMCTL_PFINFO_L2TAB) ) { int hstart; uint64_t he; hstart = (ctx->hvirt_start >> L2_PAGETABLE_SHIFT_PAE) & 0x1ff; he = ((const uint64_t *) spage)[hstart]; if ( ((he >> PAGE_SHIFT) & MFN_MASK_X86) == ctx->m2p_mfn0 ) { /* hvirt starts with xen stuff... */ xen_start = hstart; } else if ( ctx->hvirt_start != 0xf5800000 ) { /* old L2s from before hole was shrunk... */ hstart = (0xf5800000 >> L2_PAGETABLE_SHIFT_PAE) & 0x1ff; he = ((const uint64_t *) spage)[hstart]; if ( ((he >> PAGE_SHIFT) & MFN_MASK_X86) == ctx->m2p_mfn0 ) xen_start = hstart; } } if ( (ctx->pt_levels == 4) && (type == XEN_DOMCTL_PFINFO_L4TAB) ) { /* ** XXX SMH: should compute these from hvirt_start (which we have) ** and hvirt_end (which we don't) */ xen_start = 256; xen_end = 272; } /* Now iterate through the page table, canonicalizing each PTE */ for (i = 0; i < pte_last; i++ ) { unsigned long pfn, mfn; if ( ctx->pt_levels == 2 ) pte = ((const uint32_t*)spage)[i]; else pte = ((const uint64_t*)spage)[i]; if ( (i >= xen_start) && (i < xen_end) ) pte = 0; if ( pte & _PAGE_PRESENT ) { mfn = (pte >> PAGE_SHIFT) & MFN_MASK_X86; if ( !MFN_IS_IN_PSEUDOPHYS_MAP(mfn) ) { /* This will happen if the type info is stale which is quite feasible under live migration */ pfn = 0; /* zap it - we'll retransmit this page later */ /* XXX: We can't spot Xen mappings in compat-mode L2es * from 64-bit tools, but the only thing in them is the * compat m2p, so we quietly zap them. This doesn't * count as a race, so don't report it. */ if ( !(type == XEN_DOMCTL_PFINFO_L2TAB && sizeof (unsigned long) > dinfo->guest_width) ) race = 1; /* inform the caller; fatal if !live */ } else pfn = mfn_to_pfn(mfn); pte &= ~MADDR_MASK_X86; pte |= (uint64_t)pfn << PAGE_SHIFT; /* * PAE guest L3Es can contain these flags when running on * a 64bit hypervisor. We zap these here to avoid any * surprise at restore time... */ if ( (ctx->pt_levels == 3) && (type == XEN_DOMCTL_PFINFO_L3TAB) && (pte & (_PAGE_USER|_PAGE_RW|_PAGE_ACCESSED)) ) pte &= ~(_PAGE_USER|_PAGE_RW|_PAGE_ACCESSED); } if ( ctx->pt_levels == 2 ) ((uint32_t*)dpage)[i] = pte; else ((uint64_t*)dpage)[i] = pte; } return race; } xen_pfn_t *xc_map_m2p(xc_interface *xch, unsigned long max_mfn, int prot, unsigned long *mfn0) { privcmd_mmap_entry_t *entries; unsigned long m2p_chunks, m2p_size; xen_pfn_t *m2p; xen_pfn_t *extent_start; int i; m2p = NULL; m2p_size = M2P_SIZE(max_mfn); m2p_chunks = M2P_CHUNKS(max_mfn); extent_start = calloc(m2p_chunks, sizeof(xen_pfn_t)); if ( !extent_start ) { ERROR("failed to allocate space for m2p mfns"); goto err0; } if ( xc_machphys_mfn_list(xch, m2p_chunks, extent_start) ) { PERROR("xc_get_m2p_mfns"); goto err1; } entries = calloc(m2p_chunks, sizeof(privcmd_mmap_entry_t)); if (entries == NULL) { ERROR("failed to allocate space for mmap entries"); goto err1; } for ( i = 0; i < m2p_chunks; i++ ) entries[i].mfn = extent_start[i]; m2p = xc_map_foreign_ranges(xch, DOMID_XEN, m2p_size, prot, M2P_CHUNK_SIZE, entries, m2p_chunks); if (m2p == NULL) { PERROR("xc_mmap_foreign_ranges failed"); goto err2; } if (mfn0) *mfn0 = entries[0].mfn; err2: free(entries); err1: free(extent_start); err0: return m2p; } static xen_pfn_t *map_and_save_p2m_table(xc_interface *xch, int io_fd, uint32_t dom, struct save_ctx *ctx, shared_info_any_t *live_shinfo) { vcpu_guest_context_any_t ctxt; struct domain_info_context *dinfo = &ctx->dinfo; /* Double and single indirect references to the live P2M table */ void *live_p2m_frame_list_list = NULL; void *live_p2m_frame_list = NULL; /* Copies of the above. */ xen_pfn_t *p2m_frame_list_list = NULL; xen_pfn_t *p2m_frame_list = NULL; /* The mapping of the live p2m table itself */ xen_pfn_t *p2m = NULL; int i, success = 0; live_p2m_frame_list_list = map_frame_list_list(xch, dom, ctx, live_shinfo); if ( !live_p2m_frame_list_list ) goto out; /* Get a local copy of the live_P2M_frame_list_list */ if ( !(p2m_frame_list_list = malloc(PAGE_SIZE)) ) { ERROR("Couldn't allocate p2m_frame_list_list array"); goto out; } memcpy(p2m_frame_list_list, live_p2m_frame_list_list, PAGE_SIZE); /* Canonicalize guest's unsigned long vs ours */ if ( dinfo->guest_width > sizeof(unsigned long) ) for ( i = 0; i < PAGE_SIZE/sizeof(unsigned long); i++ ) if ( i < PAGE_SIZE/dinfo->guest_width ) p2m_frame_list_list[i] = ((uint64_t *)p2m_frame_list_list)[i]; else p2m_frame_list_list[i] = 0; else if ( dinfo->guest_width < sizeof(unsigned long) ) for ( i = PAGE_SIZE/sizeof(unsigned long) - 1; i >= 0; i-- ) p2m_frame_list_list[i] = ((uint32_t *)p2m_frame_list_list)[i]; live_p2m_frame_list = xc_map_foreign_pages(xch, dom, PROT_READ, p2m_frame_list_list, P2M_FLL_ENTRIES); if ( !live_p2m_frame_list ) { PERROR("Couldn't map p2m_frame_list"); goto out; } /* Get a local copy of the live_P2M_frame_list */ if ( !(p2m_frame_list = malloc(P2M_TOOLS_FL_SIZE)) ) { ERROR("Couldn't allocate p2m_frame_list array"); goto out; } memset(p2m_frame_list, 0, P2M_TOOLS_FL_SIZE); memcpy(p2m_frame_list, live_p2m_frame_list, P2M_GUEST_FL_SIZE); munmap(live_p2m_frame_list, P2M_FLL_ENTRIES * PAGE_SIZE); live_p2m_frame_list = NULL; /* Canonicalize guest's unsigned long vs ours */ if ( dinfo->guest_width > sizeof(unsigned long) ) for ( i = 0; i < P2M_FL_ENTRIES; i++ ) p2m_frame_list[i] = ((uint64_t *)p2m_frame_list)[i]; else if ( dinfo->guest_width < sizeof(unsigned long) ) for ( i = P2M_FL_ENTRIES - 1; i >= 0; i-- ) p2m_frame_list[i] = ((uint32_t *)p2m_frame_list)[i]; /* Map all the frames of the pfn->mfn table. For migrate to succeed, the guest must not change which frames are used for this purpose. (its not clear why it would want to change them, and we'll be OK from a safety POV anyhow. */ p2m = xc_map_foreign_pages(xch, dom, PROT_READ, p2m_frame_list, P2M_FL_ENTRIES); if ( !p2m ) { PERROR("Couldn't map p2m table"); goto out; } ctx->live_p2m = p2m; /* So that translation macros will work */ /* Canonicalise the pfn-to-mfn table frame-number list. */ for ( i = 0; i < dinfo->p2m_size; i += FPP ) { if ( !MFN_IS_IN_PSEUDOPHYS_MAP(p2m_frame_list[i/FPP]) ) { ERROR("Frame# in pfn-to-mfn frame list is not in pseudophys"); ERROR("entry %d: p2m_frame_list[%ld] is 0x%"PRIx64", max 0x%lx", i, i/FPP, (uint64_t)p2m_frame_list[i/FPP], ctx->max_mfn); if ( p2m_frame_list[i/FPP] < ctx->max_mfn ) { ERROR("m2p[0x%"PRIx64"] = 0x%"PRIx64, (uint64_t)p2m_frame_list[i/FPP], (uint64_t)ctx->live_m2p[p2m_frame_list[i/FPP]]); ERROR("p2m[0x%"PRIx64"] = 0x%"PRIx64, (uint64_t)ctx->live_m2p[p2m_frame_list[i/FPP]], (uint64_t)p2m[ctx->live_m2p[p2m_frame_list[i/FPP]]]); } goto out; } p2m_frame_list[i/FPP] = mfn_to_pfn(p2m_frame_list[i/FPP]); } if ( xc_vcpu_getcontext(xch, dom, 0, &ctxt) ) { PERROR("Could not get vcpu context"); goto out; } /* * Write an extended-info structure to inform the restore code that * a PAE guest understands extended CR3 (PDPTs above 4GB). Turns off * slow paths in the restore code. */ { unsigned long signature = ~0UL; uint32_t chunk1_sz = ((dinfo->guest_width==8) ? sizeof(ctxt.x64) : sizeof(ctxt.x32)); uint32_t chunk2_sz = 0; uint32_t chunk3_sz = 4; uint32_t xcnt_size = 0; uint32_t tot_sz; DECLARE_DOMCTL; domctl.cmd = XEN_DOMCTL_getvcpuextstate; domctl.domain = dom; domctl.u.vcpuextstate.vcpu = 0; domctl.u.vcpuextstate.size = 0; domctl.u.vcpuextstate.xfeature_mask = 0; if ( xc_domctl(xch, &domctl) < 0 ) { PERROR("No extended context for VCPU%d", i); goto out; } xcnt_size = domctl.u.vcpuextstate.size + 2 * sizeof(uint64_t); tot_sz = (chunk1_sz + 8) + (chunk2_sz + 8); if ( domctl.u.vcpuextstate.xfeature_mask ) tot_sz += chunk3_sz + 8; if ( write_exact(io_fd, &signature, sizeof(signature)) || write_exact(io_fd, &tot_sz, sizeof(tot_sz)) || write_exact(io_fd, "vcpu", 4) || write_exact(io_fd, &chunk1_sz, sizeof(chunk1_sz)) || write_exact(io_fd, &ctxt, chunk1_sz) || write_exact(io_fd, "extv", 4) || write_exact(io_fd, &chunk2_sz, sizeof(chunk2_sz)) || (domctl.u.vcpuextstate.xfeature_mask) ? (write_exact(io_fd, "xcnt", 4) || write_exact(io_fd, &chunk3_sz, sizeof(chunk3_sz)) || write_exact(io_fd, &xcnt_size, 4)) : 0 ) { PERROR("write: extended info"); goto out; } } if ( write_exact(io_fd, p2m_frame_list, P2M_FL_ENTRIES * sizeof(xen_pfn_t)) ) { PERROR("write: p2m_frame_list"); goto out; } success = 1; out: if ( !success && p2m ) munmap(p2m, P2M_FL_ENTRIES * PAGE_SIZE); if ( live_p2m_frame_list_list ) munmap(live_p2m_frame_list_list, PAGE_SIZE); if ( live_p2m_frame_list ) munmap(live_p2m_frame_list, P2M_FLL_ENTRIES * PAGE_SIZE); if ( p2m_frame_list_list ) free(p2m_frame_list_list); if ( p2m_frame_list ) free(p2m_frame_list); return success ? p2m : NULL; } /* must be done AFTER suspend_and_state() */ static int save_tsc_info(xc_interface *xch, uint32_t dom, int io_fd) { int marker = XC_SAVE_ID_TSC_INFO; uint32_t tsc_mode, khz, incarn; uint64_t nsec; if ( xc_domain_get_tsc_info(xch, dom, &tsc_mode, &nsec, &khz, &incarn) < 0 || write_exact(io_fd, &marker, sizeof(marker)) || write_exact(io_fd, &tsc_mode, sizeof(tsc_mode)) || write_exact(io_fd, &nsec, sizeof(nsec)) || write_exact(io_fd, &khz, sizeof(khz)) || write_exact(io_fd, &incarn, sizeof(incarn)) ) return -1; return 0; } int xc_domain_save(xc_interface *xch, int io_fd, uint32_t dom, uint32_t max_iters, uint32_t max_factor, uint32_t flags, struct save_callbacks* callbacks, int hvm) { xc_dominfo_t info; DECLARE_DOMCTL; int rc = 1, frc, i, j, last_iter = 0, iter = 0; int live = (flags & XCFLAGS_LIVE); int debug = (flags & XCFLAGS_DEBUG); int race = 0, sent_last_iter, skip_this_iter = 0; unsigned int sent_this_iter = 0; int tmem_saved = 0; /* The new domain's shared-info frame number. */ unsigned long shared_info_frame; /* A copy of the CPU context of the guest. */ vcpu_guest_context_any_t ctxt; /* A table containing the type of each PFN (/not/ MFN!). */ xen_pfn_t *pfn_type = NULL; unsigned long *pfn_batch = NULL; int *pfn_err = NULL; /* A copy of one frame of guest memory. */ char page[PAGE_SIZE]; /* Live mapping of shared info structure */ shared_info_any_t *live_shinfo = NULL; /* base of the region in which domain memory is mapped */ unsigned char *region_base = NULL; /* A copy of the CPU eXtended States of the guest. */ DECLARE_HYPERCALL_BUFFER(void, buffer); /* bitmap of pages: - that should be sent this iteration (unless later marked as skip); - to skip this iteration because already dirty; - to fixup by sending at the end if not already resent; */ DECLARE_HYPERCALL_BUFFER(unsigned long, to_skip); DECLARE_HYPERCALL_BUFFER(unsigned long, to_send); unsigned long *to_fix = NULL; xc_shadow_op_stats_t stats; unsigned long needed_to_fix = 0; unsigned long total_sent = 0; uint64_t vcpumap = 1ULL; /* HVM: a buffer for holding HVM context */ uint32_t hvm_buf_size = 0; uint8_t *hvm_buf = NULL; /* HVM: magic frames for ioreqs and xenstore comms. */ uint64_t magic_pfns[3]; /* ioreq_pfn, bufioreq_pfn, store_pfn */ unsigned long mfn; struct outbuf ob; static struct save_ctx _ctx = { .live_p2m = NULL, .live_m2p = NULL, }; static struct save_ctx *ctx = &_ctx; struct domain_info_context *dinfo = &ctx->dinfo; int completed = 0; if ( hvm && !callbacks->switch_qemu_logdirty ) { ERROR("No switch_qemu_logdirty callback provided."); errno = EINVAL; return 1; } outbuf_init(xch, &ob, OUTBUF_SIZE); /* If no explicit control parameters given, use defaults */ max_iters = max_iters ? : DEF_MAX_ITERS; max_factor = max_factor ? : DEF_MAX_FACTOR; initialize_mbit_rate(); if ( !get_platform_info(xch, dom, &ctx->max_mfn, &ctx->hvirt_start, &ctx->pt_levels, &dinfo->guest_width) ) { ERROR("Unable to get platform info."); return 1; } if ( xc_domain_getinfo(xch, dom, 1, &info) != 1 ) { PERROR("Could not get domain info"); return 1; } shared_info_frame = info.shared_info_frame; /* Map the shared info frame */ if ( !hvm ) { live_shinfo = xc_map_foreign_range(xch, dom, PAGE_SIZE, PROT_READ, shared_info_frame); if ( !live_shinfo ) { PERROR("Couldn't map live_shinfo"); goto out; } } /* Get the size of the P2M table */ dinfo->p2m_size = xc_domain_maximum_gpfn(xch, dom) + 1; if ( dinfo->p2m_size > ~XEN_DOMCTL_PFINFO_LTAB_MASK ) { ERROR("Cannot save this big a guest"); goto out; } /* Domain is still running at this point */ if ( live ) { /* Live suspend. Enable log-dirty mode. */ if ( xc_shadow_control(xch, dom, XEN_DOMCTL_SHADOW_OP_ENABLE_LOGDIRTY, NULL, 0, NULL, 0, NULL) < 0 ) { /* log-dirty already enabled? There's no test op, so attempt to disable then reenable it */ frc = xc_shadow_control(xch, dom, XEN_DOMCTL_SHADOW_OP_OFF, NULL, 0, NULL, 0, NULL); if ( frc >= 0 ) { frc = xc_shadow_control(xch, dom, XEN_DOMCTL_SHADOW_OP_ENABLE_LOGDIRTY, NULL, 0, NULL, 0, NULL); } if ( frc < 0 ) { PERROR("Couldn't enable shadow mode (rc %d) (errno %d)", frc, errno ); goto out; } } /* Enable qemu-dm logging dirty pages to xen */ if ( hvm && callbacks->switch_qemu_logdirty(dom, 1, callbacks->data) ) { PERROR("Couldn't enable qemu log-dirty mode (errno %d)", errno); goto out; } } else { /* This is a non-live suspend. Suspend the domain .*/ if ( suspend_and_state(callbacks->suspend, callbacks->data, xch, io_fd, dom, &info) ) { ERROR("Domain appears not to have suspended"); goto out; } } last_iter = !live; /* pretend we sent all the pages last iteration */ sent_last_iter = dinfo->p2m_size; /* Setup to_send / to_fix and to_skip bitmaps */ to_send = xc_hypercall_buffer_alloc_pages(xch, to_send, NRPAGES(BITMAP_SIZE)); to_skip = xc_hypercall_buffer_alloc_pages(xch, to_skip, NRPAGES(BITMAP_SIZE)); to_fix = calloc(1, BITMAP_SIZE); if ( !to_send || !to_fix || !to_skip ) { ERROR("Couldn't allocate to_send array"); goto out; } memset(to_send, 0xff, BITMAP_SIZE); if ( hvm ) { /* Need another buffer for HVM context */ hvm_buf_size = xc_domain_hvm_getcontext(xch, dom, 0, 0); if ( hvm_buf_size == -1 ) { PERROR("Couldn't get HVM context size from Xen"); goto out; } hvm_buf = malloc(hvm_buf_size); if ( !hvm_buf ) { ERROR("Couldn't allocate memory"); goto out; } } analysis_phase(xch, dom, ctx, HYPERCALL_BUFFER(to_skip), 0); pfn_type = malloc(ROUNDUP(MAX_BATCH_SIZE * sizeof(*pfn_type), PAGE_SHIFT)); pfn_batch = calloc(MAX_BATCH_SIZE, sizeof(*pfn_batch)); pfn_err = malloc(MAX_BATCH_SIZE * sizeof(*pfn_err)); if ( (pfn_type == NULL) || (pfn_batch == NULL) || (pfn_err == NULL) ) { ERROR("failed to alloc memory for pfn_type and/or pfn_batch arrays"); errno = ENOMEM; goto out; } memset(pfn_type, 0, ROUNDUP(MAX_BATCH_SIZE * sizeof(*pfn_type), PAGE_SHIFT)); /* Setup the mfn_to_pfn table mapping */ if ( !(ctx->live_m2p = xc_map_m2p(xch, ctx->max_mfn, PROT_READ, &ctx->m2p_mfn0)) ) { PERROR("Failed to map live M2P table"); goto out; } /* Start writing out the saved-domain record. */ if ( write_exact(io_fd, &dinfo->p2m_size, sizeof(unsigned long)) ) { PERROR("write: p2m_size"); goto out; } if ( !hvm ) { int err = 0; /* Map the P2M table, and write the list of P2M frames */ ctx->live_p2m = map_and_save_p2m_table(xch, io_fd, dom, ctx, live_shinfo); if ( ctx->live_p2m == NULL ) { PERROR("Failed to map/save the p2m frame list"); goto out; } /* * Quick belt and braces sanity check. */ for ( i = 0; i < dinfo->p2m_size; i++ ) { mfn = pfn_to_mfn(i); if( (mfn != INVALID_P2M_ENTRY) && (mfn_to_pfn(mfn) != i) ) { DPRINTF("i=0x%x mfn=%lx live_m2p=%lx\n", i, mfn, mfn_to_pfn(mfn)); err++; } } DPRINTF("Had %d unexplained entries in p2m table\n", err); } print_stats(xch, dom, 0, &stats, 0); tmem_saved = xc_tmem_save(xch, dom, io_fd, live, XC_SAVE_ID_TMEM); if ( tmem_saved == -1 ) { PERROR("Error when writing to state file (tmem)"); goto out; } if ( !live && save_tsc_info(xch, dom, io_fd) < 0 ) { PERROR("Error when writing to state file (tsc)"); goto out; } copypages: #define wrexact(fd, buf, len) write_buffer(xch, last_iter, &ob, (fd), (buf), (len)) #ifdef ratewrite #undef ratewrite #endif #define ratewrite(fd, live, buf, len) ratewrite_buffer(xch, last_iter, &ob, (fd), (live), (buf), (len)) /* Now write out each data page, canonicalising page tables as we go... */ for ( ; ; ) { unsigned int N, batch, run; char reportbuf[80]; snprintf(reportbuf, sizeof(reportbuf), "Saving memory: iter %d (last sent %u skipped %u)", iter, sent_this_iter, skip_this_iter); xc_report_progress_start(xch, reportbuf, dinfo->p2m_size); iter++; sent_this_iter = 0; skip_this_iter = 0; N = 0; while ( N < dinfo->p2m_size ) { xc_report_progress_step(xch, N, dinfo->p2m_size); if ( !last_iter ) { /* Slightly wasteful to peek the whole array every time, but this is fast enough for the moment. */ frc = xc_shadow_control( xch, dom, XEN_DOMCTL_SHADOW_OP_PEEK, HYPERCALL_BUFFER(to_skip), dinfo->p2m_size, NULL, 0, NULL); if ( frc != dinfo->p2m_size ) { ERROR("Error peeking shadow bitmap"); goto out; } } /* load pfn_type[] with the mfn of all the pages we're doing in this batch. */ for ( batch = 0; (batch < MAX_BATCH_SIZE) && (N < dinfo->p2m_size); N++ ) { int n = N; if ( debug ) { DPRINTF("%d pfn= %08lx mfn= %08lx %d", iter, (unsigned long)n, hvm ? 0 : pfn_to_mfn(n), test_bit(n, to_send)); if ( !hvm && is_mapped(pfn_to_mfn(n)) ) DPRINTF(" [mfn]= %08lx", mfn_to_pfn(pfn_to_mfn(n)&0xFFFFF)); DPRINTF("\n"); } if ( completed ) { /* for sparse bitmaps, word-by-word may save time */ if ( !to_send[N >> ORDER_LONG] ) { /* incremented again in for loop! */ N += BITS_PER_LONG - 1; continue; } if ( !test_bit(n, to_send) ) continue; pfn_batch[batch] = n; if ( hvm ) pfn_type[batch] = n; else pfn_type[batch] = pfn_to_mfn(n); } else { if ( !last_iter && test_bit(n, to_send) && test_bit(n, to_skip) ) skip_this_iter++; /* stats keeping */ if ( !((test_bit(n, to_send) && !test_bit(n, to_skip)) || (test_bit(n, to_send) && last_iter) || (test_bit(n, to_fix) && last_iter)) ) continue; /* ** we get here if: ** 1. page is marked to_send & hasn't already been re-dirtied ** 2. (ignore to_skip in last iteration) ** 3. add in pages that still need fixup (net bufs) */ pfn_batch[batch] = n; /* Hypercall interfaces operate in PFNs for HVM guests * and MFNs for PV guests */ if ( hvm ) pfn_type[batch] = n; else pfn_type[batch] = pfn_to_mfn(n); if ( !is_mapped(pfn_type[batch]) ) { /* ** not currently in psuedo-physical map -- set bit ** in to_fix since we must send this page in last_iter ** unless its sent sooner anyhow, or it never enters ** pseudo-physical map (e.g. for ballooned down doms) */ set_bit(n, to_fix); continue; } if ( last_iter && test_bit(n, to_fix) && !test_bit(n, to_send) ) { needed_to_fix++; DPRINTF("Fix! iter %d, pfn %x. mfn %lx\n", iter, n, pfn_type[batch]); } clear_bit(n, to_fix); } batch++; } if ( batch == 0 ) goto skip; /* vanishingly unlikely... */ region_base = xc_map_foreign_bulk( xch, dom, PROT_READ, pfn_type, pfn_err, batch); if ( region_base == NULL ) { PERROR("map batch failed"); goto out; } /* Get page types */ if ( xc_get_pfn_type_batch(xch, dom, batch, pfn_type) ) { PERROR("get_pfn_type_batch failed"); goto out; } for ( run = j = 0; j < batch; j++ ) { unsigned long gmfn = pfn_batch[j]; if ( !hvm ) gmfn = pfn_to_mfn(gmfn); if ( pfn_err[j] ) { if ( pfn_type[j] == XEN_DOMCTL_PFINFO_XTAB ) continue; DPRINTF("map fail: page %i mfn %08lx err %d\n", j, gmfn, pfn_err[j]); pfn_type[j] = XEN_DOMCTL_PFINFO_XTAB; continue; } if ( pfn_type[j] == XEN_DOMCTL_PFINFO_XTAB ) { DPRINTF("type fail: page %i mfn %08lx\n", j, gmfn); continue; } /* canonicalise mfn->pfn */ pfn_type[j] |= pfn_batch[j]; ++run; if ( debug ) { if ( hvm ) DPRINTF("%d pfn=%08lx sum=%08lx\n", iter, pfn_type[j], csum_page(region_base + (PAGE_SIZE*j))); else DPRINTF("%d pfn= %08lx mfn= %08lx [mfn]= %08lx" " sum= %08lx\n", iter, pfn_type[j], gmfn, mfn_to_pfn(gmfn), csum_page(region_base + (PAGE_SIZE*j))); } } if ( !run ) { munmap(region_base, batch*PAGE_SIZE); continue; /* bail on this batch: no valid pages */ } if ( wrexact(io_fd, &batch, sizeof(unsigned int)) ) { PERROR("Error when writing to state file (2)"); goto out; } if ( sizeof(unsigned long) < sizeof(*pfn_type) ) for ( j = 0; j < batch; j++ ) ((unsigned long *)pfn_type)[j] = pfn_type[j]; if ( wrexact(io_fd, pfn_type, sizeof(unsigned long)*batch) ) { PERROR("Error when writing to state file (3)"); goto out; } if ( sizeof(unsigned long) < sizeof(*pfn_type) ) while ( --j >= 0 ) pfn_type[j] = ((unsigned long *)pfn_type)[j]; /* entering this loop, pfn_type is now in pfns (Not mfns) */ run = 0; for ( j = 0; j < batch; j++ ) { unsigned long pfn, pagetype; void *spage = (char *)region_base + (PAGE_SIZE*j); pfn = pfn_type[j] & ~XEN_DOMCTL_PFINFO_LTAB_MASK; pagetype = pfn_type[j] & XEN_DOMCTL_PFINFO_LTAB_MASK; if ( pagetype != 0 ) { /* If the page is not a normal data page, write out any run of pages we may have previously acumulated */ if ( run ) { if ( ratewrite(io_fd, live, (char*)region_base+(PAGE_SIZE*(j-run)), PAGE_SIZE*run) != PAGE_SIZE*run ) { PERROR("Error when writing to state file (4a)" " (errno %d)", errno); goto out; } run = 0; } } /* skip pages that aren't present */ if ( pagetype == XEN_DOMCTL_PFINFO_XTAB ) continue; pagetype &= XEN_DOMCTL_PFINFO_LTABTYPE_MASK; if ( (pagetype >= XEN_DOMCTL_PFINFO_L1TAB) && (pagetype <= XEN_DOMCTL_PFINFO_L4TAB) ) { /* We have a pagetable page: need to rewrite it. */ race = canonicalize_pagetable(ctx, pagetype, pfn, spage, page); if ( race && !live ) { ERROR("Fatal PT race (pfn %lx, type %08lx)", pfn, pagetype); goto out; } if ( ratewrite(io_fd, live, page, PAGE_SIZE) != PAGE_SIZE ) { PERROR("Error when writing to state file (4b)" " (errno %d)", errno); goto out; } } else { /* We have a normal page: accumulate it for writing. */ run++; } } /* end of the write out for this batch */ if ( run ) { /* write out the last accumulated run of pages */ if ( ratewrite(io_fd, live, (char*)region_base+(PAGE_SIZE*(j-run)), PAGE_SIZE*run) != PAGE_SIZE*run ) { PERROR("Error when writing to state file (4c)" " (errno %d)", errno); goto out; } } sent_this_iter += batch; munmap(region_base, batch*PAGE_SIZE); } /* end of this while loop for this iteration */ skip: xc_report_progress_step(xch, dinfo->p2m_size, dinfo->p2m_size); total_sent += sent_this_iter; if ( last_iter ) { print_stats( xch, dom, sent_this_iter, &stats, 1); DPRINTF("Total pages sent= %ld (%.2fx)\n", total_sent, ((float)total_sent)/dinfo->p2m_size ); DPRINTF("(of which %ld were fixups)\n", needed_to_fix ); } if ( last_iter && debug ) { int id = XC_SAVE_ID_ENABLE_VERIFY_MODE; memset(to_send, 0xff, BITMAP_SIZE); debug = 0; DPRINTF("Entering debug resend-all mode\n"); /* send "-1" to put receiver into debug mode */ if ( wrexact(io_fd, &id, sizeof(int)) ) { PERROR("Error when writing to state file (6)"); goto out; } continue; } if ( last_iter ) break; if ( live ) { if ( ((sent_this_iter > sent_last_iter) && RATE_IS_MAX()) || (iter >= max_iters) || (sent_this_iter+skip_this_iter < 50) || (total_sent > dinfo->p2m_size*max_factor) ) { DPRINTF("Start last iteration\n"); last_iter = 1; if ( suspend_and_state(callbacks->suspend, callbacks->data, xch, io_fd, dom, &info) ) { ERROR("Domain appears not to have suspended"); goto out; } DPRINTF("SUSPEND shinfo %08lx\n", info.shared_info_frame); if ( (tmem_saved > 0) && (xc_tmem_save_extra(xch,dom,io_fd,XC_SAVE_ID_TMEM_EXTRA) == -1) ) { PERROR("Error when writing to state file (tmem)"); goto out; } if ( save_tsc_info(xch, dom, io_fd) < 0 ) { PERROR("Error when writing to state file (tsc)"); goto out; } } if ( xc_shadow_control(xch, dom, XEN_DOMCTL_SHADOW_OP_CLEAN, HYPERCALL_BUFFER(to_send), dinfo->p2m_size, NULL, 0, &stats) != dinfo->p2m_size ) { PERROR("Error flushing shadow PT"); goto out; } sent_last_iter = sent_this_iter; print_stats(xch, dom, sent_this_iter, &stats, 1); } } /* end of infinite for loop */ DPRINTF("All memory is saved\n"); { struct { int id; int max_vcpu_id; uint64_t vcpumap; } chunk = { XC_SAVE_ID_VCPU_INFO, info.max_vcpu_id }; if ( info.max_vcpu_id >= 64 ) { ERROR("Too many VCPUS in guest!"); goto out; } for ( i = 1; i <= info.max_vcpu_id; i++ ) { xc_vcpuinfo_t vinfo; if ( (xc_vcpu_getinfo(xch, dom, i, &vinfo) == 0) && vinfo.online ) vcpumap |= 1ULL << i; } chunk.vcpumap = vcpumap; if ( wrexact(io_fd, &chunk, sizeof(chunk)) ) { PERROR("Error when writing to state file"); goto out; } } if ( hvm ) { struct { int id; uint32_t pad; uint64_t data; } chunk = { 0, }; chunk.id = XC_SAVE_ID_HVM_IDENT_PT; chunk.data = 0; xc_get_hvm_param(xch, dom, HVM_PARAM_IDENT_PT, (unsigned long *)&chunk.data); if ( (chunk.data != 0) && wrexact(io_fd, &chunk, sizeof(chunk)) ) { PERROR("Error when writing the ident_pt for EPT guest"); goto out; } chunk.id = XC_SAVE_ID_HVM_VM86_TSS; chunk.data = 0; xc_get_hvm_param(xch, dom, HVM_PARAM_VM86_TSS, (unsigned long *)&chunk.data); if ( (chunk.data != 0) && wrexact(io_fd, &chunk, sizeof(chunk)) ) { PERROR("Error when writing the vm86 TSS for guest"); goto out; } chunk.id = XC_SAVE_ID_HVM_CONSOLE_PFN; chunk.data = 0; xc_get_hvm_param(xch, dom, HVM_PARAM_CONSOLE_PFN, (unsigned long *)&chunk.data); if ( (chunk.data != 0) && wrexact(io_fd, &chunk, sizeof(chunk)) ) { PERROR("Error when writing the console pfn for guest"); goto out; } chunk.id = XC_SAVE_ID_HVM_ACPI_IOPORTS_LOCATION; chunk.data = 0; xc_get_hvm_param(xch, dom, HVM_PARAM_ACPI_IOPORTS_LOCATION, (unsigned long *)&chunk.data); if ((chunk.data != 0) && wrexact(io_fd, &chunk, sizeof(chunk))) { PERROR("Error when writing the firmware ioport version"); goto out; } } if ( !callbacks->checkpoint ) { /* * If this is not a checkpointed save then this must be the first and * last checkpoint. */ i = XC_SAVE_ID_LAST_CHECKPOINT; if ( wrexact(io_fd, &i, sizeof(int)) ) { PERROR("Error when writing last checkpoint chunk"); goto out; } } /* Zero terminate */ i = 0; if ( wrexact(io_fd, &i, sizeof(int)) ) { PERROR("Error when writing to state file (6')"); goto out; } if ( hvm ) { uint32_t rec_size; /* Save magic-page locations. */ memset(magic_pfns, 0, sizeof(magic_pfns)); xc_get_hvm_param(xch, dom, HVM_PARAM_IOREQ_PFN, (unsigned long *)&magic_pfns[0]); xc_get_hvm_param(xch, dom, HVM_PARAM_BUFIOREQ_PFN, (unsigned long *)&magic_pfns[1]); xc_get_hvm_param(xch, dom, HVM_PARAM_STORE_PFN, (unsigned long *)&magic_pfns[2]); if ( wrexact(io_fd, magic_pfns, sizeof(magic_pfns)) ) { PERROR("Error when writing to state file (7)"); goto out; } /* Get HVM context from Xen and save it too */ if ( (rec_size = xc_domain_hvm_getcontext(xch, dom, hvm_buf, hvm_buf_size)) == -1 ) { PERROR("HVM:Could not get hvm buffer"); goto out; } if ( wrexact(io_fd, &rec_size, sizeof(uint32_t)) ) { PERROR("error write hvm buffer size"); goto out; } if ( wrexact(io_fd, hvm_buf, rec_size) ) { PERROR("write HVM info failed!"); goto out; } /* HVM guests are done now */ rc = 0; goto out; } /* PV guests only from now on */ /* Send through a list of all the PFNs that were not in map at the close */ { unsigned int i,j; unsigned long pfntab[1024]; for ( i = 0, j = 0; i < dinfo->p2m_size; i++ ) { if ( !is_mapped(pfn_to_mfn(i)) ) j++; } if ( wrexact(io_fd, &j, sizeof(unsigned int)) ) { PERROR("Error when writing to state file (6a)"); goto out; } for ( i = 0, j = 0; i < dinfo->p2m_size; ) { if ( !is_mapped(pfn_to_mfn(i)) ) pfntab[j++] = i; i++; if ( (j == 1024) || (i == dinfo->p2m_size) ) { if ( wrexact(io_fd, &pfntab, sizeof(unsigned long)*j) ) { PERROR("Error when writing to state file (6b)"); goto out; } j = 0; } } } if ( xc_vcpu_getcontext(xch, dom, 0, &ctxt) ) { PERROR("Could not get vcpu context"); goto out; } /* Canonicalise the suspend-record frame number. */ mfn = GET_FIELD(&ctxt, user_regs.edx); if ( !MFN_IS_IN_PSEUDOPHYS_MAP(mfn) ) { ERROR("Suspend record is not in range of pseudophys map"); goto out; } SET_FIELD(&ctxt, user_regs.edx, mfn_to_pfn(mfn)); for ( i = 0; i <= info.max_vcpu_id; i++ ) { if ( !(vcpumap & (1ULL << i)) ) continue; if ( (i != 0) && xc_vcpu_getcontext(xch, dom, i, &ctxt) ) { PERROR("No context for VCPU%d", i); goto out; } /* Canonicalise each GDT frame number. */ for ( j = 0; (512*j) < GET_FIELD(&ctxt, gdt_ents); j++ ) { mfn = GET_FIELD(&ctxt, gdt_frames[j]); if ( !MFN_IS_IN_PSEUDOPHYS_MAP(mfn) ) { ERROR("GDT frame is not in range of pseudophys map"); goto out; } SET_FIELD(&ctxt, gdt_frames[j], mfn_to_pfn(mfn)); } /* Canonicalise the page table base pointer. */ if ( !MFN_IS_IN_PSEUDOPHYS_MAP(UNFOLD_CR3( GET_FIELD(&ctxt, ctrlreg[3]))) ) { ERROR("PT base is not in range of pseudophys map"); goto out; } SET_FIELD(&ctxt, ctrlreg[3], FOLD_CR3(mfn_to_pfn(UNFOLD_CR3(GET_FIELD(&ctxt, ctrlreg[3]))))); /* Guest pagetable (x86/64) stored in otherwise-unused CR1. */ if ( (ctx->pt_levels == 4) && ctxt.x64.ctrlreg[1] ) { if ( !MFN_IS_IN_PSEUDOPHYS_MAP(UNFOLD_CR3(ctxt.x64.ctrlreg[1])) ) { ERROR("PT base is not in range of pseudophys map"); goto out; } /* Least-significant bit means 'valid PFN'. */ ctxt.x64.ctrlreg[1] = 1 | FOLD_CR3(mfn_to_pfn(UNFOLD_CR3(ctxt.x64.ctrlreg[1]))); } if ( wrexact(io_fd, &ctxt, ((dinfo->guest_width==8) ? sizeof(ctxt.x64) : sizeof(ctxt.x32))) ) { PERROR("Error when writing to state file (1)"); goto out; } domctl.cmd = XEN_DOMCTL_get_ext_vcpucontext; domctl.domain = dom; domctl.u.ext_vcpucontext.vcpu = i; if ( xc_domctl(xch, &domctl) < 0 ) { PERROR("No extended context for VCPU%d", i); goto out; } if ( wrexact(io_fd, &domctl.u.ext_vcpucontext, 128) ) { PERROR("Error when writing to state file (2)"); goto out; } /* Start to fetch CPU eXtended States */ /* Get buffer size first */ domctl.cmd = XEN_DOMCTL_getvcpuextstate; domctl.domain = dom; domctl.u.vcpuextstate.vcpu = i; domctl.u.vcpuextstate.xfeature_mask = 0; domctl.u.vcpuextstate.size = 0; if ( xc_domctl(xch, &domctl) < 0 ) { PERROR("No eXtended states (XSAVE) for VCPU%d", i); goto out; } if ( !domctl.u.vcpuextstate.xfeature_mask ) continue; /* Getting eXtended states data */ buffer = xc_hypercall_buffer_alloc(xch, buffer, domctl.u.vcpuextstate.size); if ( !buffer ) { PERROR("Insufficient memory for getting eXtended states for" "VCPU%d", i); goto out; } set_xen_guest_handle(domctl.u.vcpuextstate.buffer, buffer); if ( xc_domctl(xch, &domctl) < 0 ) { PERROR("No eXtended states (XSAVE) for VCPU%d", i); xc_hypercall_buffer_free(xch, buffer); goto out; } if ( wrexact(io_fd, &domctl.u.vcpuextstate.xfeature_mask, sizeof(domctl.u.vcpuextstate.xfeature_mask)) || wrexact(io_fd, &domctl.u.vcpuextstate.size, sizeof(domctl.u.vcpuextstate.size)) || wrexact(io_fd, buffer, domctl.u.vcpuextstate.size) ) { PERROR("Error when writing to state file VCPU extended state"); xc_hypercall_buffer_free(xch, buffer); goto out; } xc_hypercall_buffer_free(xch, buffer); } /* * Reset the MFN to be a known-invalid value. See map_frame_list_list(). */ memcpy(page, live_shinfo, PAGE_SIZE); SET_FIELD(((shared_info_any_t *)page), arch.pfn_to_mfn_frame_list_list, 0); if ( wrexact(io_fd, page, PAGE_SIZE) ) { PERROR("Error when writing to state file (1)"); goto out; } /* Flush last write and check for errors. */ if ( fsync(io_fd) && errno != EINVAL ) { PERROR("Error when flushing state file"); goto out; } /* Success! */ rc = 0; out: completed = 1; if ( !rc && callbacks->postcopy ) callbacks->postcopy(callbacks->data); /* Flush last write and discard cache for file. */ if ( outbuf_flush(xch, &ob, io_fd) < 0 ) { PERROR("Error when flushing output buffer"); rc = 1; } discard_file_cache(xch, io_fd, 1 /* flush */); /* checkpoint_cb can spend arbitrarily long in between rounds */ if (!rc && callbacks->checkpoint && callbacks->checkpoint(callbacks->data) > 0) { /* reset stats timer */ print_stats(xch, dom, 0, &stats, 0); rc = 1; /* last_iter = 1; */ if ( suspend_and_state(callbacks->suspend, callbacks->data, xch, io_fd, dom, &info) ) { ERROR("Domain appears not to have suspended"); goto out; } DPRINTF("SUSPEND shinfo %08lx\n", info.shared_info_frame); print_stats(xch, dom, 0, &stats, 1); if ( xc_shadow_control(xch, dom, XEN_DOMCTL_SHADOW_OP_CLEAN, HYPERCALL_BUFFER(to_send), dinfo->p2m_size, NULL, 0, &stats) != dinfo->p2m_size ) { PERROR("Error flushing shadow PT"); } goto copypages; } if ( tmem_saved != 0 && live ) xc_tmem_save_done(xch, dom); if ( live ) { if ( xc_shadow_control(xch, dom, XEN_DOMCTL_SHADOW_OP_OFF, NULL, 0, NULL, 0, NULL) < 0 ) DPRINTF("Warning - couldn't disable shadow mode"); if ( hvm && callbacks->switch_qemu_logdirty(dom, 0, callbacks->data) ) DPRINTF("Warning - couldn't disable qemu log-dirty mode"); } if ( live_shinfo ) munmap(live_shinfo, PAGE_SIZE); if ( ctx->live_p2m ) munmap(ctx->live_p2m, P2M_FL_ENTRIES * PAGE_SIZE); if ( ctx->live_m2p ) munmap(ctx->live_m2p, M2P_SIZE(ctx->max_mfn)); xc_hypercall_buffer_free_pages(xch, to_send, NRPAGES(BITMAP_SIZE)); xc_hypercall_buffer_free_pages(xch, to_skip, NRPAGES(BITMAP_SIZE)); free(pfn_type); free(pfn_batch); free(pfn_err); free(to_fix); DPRINTF("Save exit rc=%d\n",rc); return !!rc; } /* * Local variables: * mode: C * c-set-style: "BSD" * c-basic-offset: 4 * tab-width: 4 * indent-tabs-mode: nil * End: */ n1689'>1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395
generated by cgit v1.2.3 (git 2.25.1) at 2026-01-06 11:55:20 +0000