/****************************************************************************** * xc_hvm_build.c * * 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 */ #include #include #include #include #include #include "xg_private.h" #include "xc_private.h" #include #include #include #include #include #include #define SUPERPAGE_2MB_SHIFT 9 #define SUPERPAGE_2MB_NR_PFNS (1UL << SUPERPAGE_2MB_SHIFT) #define SUPERPAGE_1GB_SHIFT 18 #define SUPERPAGE_1GB_NR_PFNS (1UL << SUPERPAGE_1GB_SHIFT) #define SPECIALPAGE_BUFIOREQ 0 #define SPECIALPAGE_XENSTORE 1 #define SPECIALPAGE_IOREQ 2 #define SPECIALPAGE_IDENT_PT 3 #define SPECIALPAGE_CONSOLE 4 #define NR_SPECIAL_PAGES 5 #define special_pfn(x) (0xff000u - NR_SPECIAL_PAGES + (x)) static void build_hvm_info(void *hvm_info_page, uint64_t mem_size) { struct hvm_info_table *hvm_info = (struct hvm_info_table *) (((unsigned char *)hvm_info_page) + HVM_INFO_OFFSET); uint64_t lowmem_end = mem_size, highmem_end = 0; uint8_t sum; int i; if ( lowmem_end > HVM_BELOW_4G_RAM_END ) { highmem_end = lowmem_end + (1ull<<32) - HVM_BELOW_4G_RAM_END; lowmem_end = HVM_BELOW_4G_RAM_END; } memset(hvm_info_page, 0, PAGE_SIZE); /* Fill in the header. */ strncpy(hvm_info->signature, "HVM INFO", 8); hvm_info->length = sizeof(struct hvm_info_table); /* Sensible defaults: these can be overridden by the caller. */ hvm_info->apic_mode = 1; hvm_info->nr_vcpus = 1; memset(hvm_info->vcpu_online, 0xff, sizeof(hvm_info->vcpu_online)); /* Memory parameters. */ hvm_info->low_mem_pgend = lowmem_end >> PAGE_SHIFT; hvm_info->high_mem_pgend = highmem_end >> PAGE_SHIFT; hvm_info->reserved_mem_pgstart = special_pfn(0); /* Finish with the checksum. */ for ( i = 0, sum = 0; i < hvm_info->length; i++ ) sum += ((uint8_t *)hvm_info)[i]; hvm_info->checksum = -sum; } static int loadelfimage( xc_interface *xch, struct elf_binary *elf, uint32_t dom, unsigned long *parray) { privcmd_mmap_entry_t *entries = NULL; unsigned long pfn_start = elf->pstart >> PAGE_SHIFT; unsigned long pfn_end = (elf->pend + PAGE_SIZE - 1) >> PAGE_SHIFT; size_t pages = pfn_end - pfn_start; int i, rc = -1; /* Map address space for initial elf image. */ entries = calloc(pages, sizeof(privcmd_mmap_entry_t)); if ( entries == NULL ) goto err; for ( i = 0; i < pages; i++ ) entries[i].mfn = parray[(elf->pstart >> PAGE_SHIFT) + i]; elf->dest = xc_map_foreign_ranges( xch, dom, pages << PAGE_SHIFT, PROT_READ | PROT_WRITE, 1 << PAGE_SHIFT, entries, pages); if ( elf->dest == NULL ) goto err; elf->dest += elf->pstart & (PAGE_SIZE - 1); /* Load the initial elf image. */ elf_load_binary(elf); rc = 0; munmap(elf->dest, pages << PAGE_SHIFT); elf->dest = NULL; err: free(entries); return rc; } /* * Check whether there exists mmio hole in the specified memory range. * Returns 1 if exists, else returns 0. */ static int check_mmio_hole(uint64_t start, uint64_t memsize) { if ( start + memsize <= HVM_BELOW_4G_MMIO_START || start >= HVM_BELOW_4G_MMIO_START + HVM_BELOW_4G_MMIO_LENGTH ) return 0; else return 1; } static int setup_guest(xc_interface *xch, uint32_t dom, int memsize, int target, char *image, unsigned long image_size) { xen_pfn_t *page_array = NULL; unsigned long i, nr_pages = (unsigned long)memsize << (20 - PAGE_SHIFT); unsigned long target_pages = (unsigned long)target << (20 - PAGE_SHIFT); unsigned long entry_eip, cur_pages, cur_pfn; void *hvm_info_page; uint32_t *ident_pt; struct elf_binary elf; uint64_t v_start, v_end; int rc; xen_capabilities_info_t caps; unsigned long stat_normal_pages = 0, stat_2mb_pages = 0, stat_1gb_pages = 0; int pod_mode = 0; /* An HVM guest must be initialised with at least 2MB memory. */ if ( memsize < 2 || target < 2 ) goto error_out; if ( memsize > target ) pod_mode = 1; memset(&elf, 0, sizeof(elf)); if ( elf_init(&elf, image, image_size) != 0 ) goto error_out; xc_elf_set_logfile(xch, &elf, 1); elf_parse_binary(&elf); v_start = 0; v_end = (unsigned long long)memsize << 20; if ( xc_version(xch, XENVER_capabilities, &caps) != 0 ) { PERROR("Could not get Xen capabilities"); goto error_out; } IPRINTF("VIRTUAL MEMORY ARRANGEMENT:\n" " Loader: %016"PRIx64"->%016"PRIx64"\n" " TOTAL: %016"PRIx64"->%016"PRIx64"\n" " ENTRY ADDRESS: %016"PRIx64"\n", elf.pstart, elf.pend, v_start, v_end, elf_uval(&elf, elf.ehdr, e_entry)); if ( (page_array = malloc(nr_pages * sizeof(xen_pfn_t))) == NULL ) { PERROR("Could not allocate memory."); goto error_out; } for ( i = 0; i < nr_pages; i++ ) page_array[i] = i; for ( i = HVM_BELOW_4G_RAM_END >> PAGE_SHIFT; i < nr_pages; i++ ) page_array[i] += HVM_BELOW_4G_MMIO_LENGTH >> PAGE_SHIFT; /* * Allocate memory for HVM guest, skipping VGA hole 0xA0000-0xC0000. * * We attempt to allocate 1GB pages if possible. It falls back on 2MB * pages if 1GB allocation fails. 4KB pages will be used eventually if * both fail. * * Under 2MB mode, we allocate pages in batches of no more than 8MB to * ensure that we can be preempted and hence dom0 remains responsive. */ rc = xc_domain_populate_physmap_exact( xch, dom, 0xa0, 0, 0, &page_array[0x00]); cur_pages = 0xc0; stat_normal_pages = 0xc0; while ( (rc == 0) && (nr_pages > cur_pages) ) { /* Clip count to maximum 1GB extent. */ unsigned long count = nr_pages - cur_pages; unsigned long max_pages = SUPERPAGE_1GB_NR_PFNS; if ( count > max_pages ) count = max_pages; cur_pfn = page_array[cur_pages]; /* Take care the corner cases of super page tails */ if ( ((cur_pfn & (SUPERPAGE_1GB_NR_PFNS-1)) != 0) && (count > (-cur_pfn & (SUPERPAGE_1GB_NR_PFNS-1))) ) count = -cur_pfn & (SUPERPAGE_1GB_NR_PFNS-1); else if ( ((count & (SUPERPAGE_1GB_NR_PFNS-1)) != 0) && (count > SUPERPAGE_1GB_NR_PFNS) ) count &= ~(SUPERPAGE_1GB_NR_PFNS - 1); /* Attemp to allocate 1GB super page. Because in each pass we only * allocate at most 1GB, we don't have to clip super page boundaries. */ if ( ((count | cur_pfn) & (SUPERPAGE_1GB_NR_PFNS - 1)) == 0 && /* Check if there exists MMIO hole in the 1GB memory range */ !check_mmio_hole(cur_pfn << PAGE_SHIFT, SUPERPAGE_1GB_NR_PFNS << PAGE_SHIFT) ) { long done; unsigned long nr_extents = count >> SUPERPAGE_1GB_SHIFT; xen_pfn_t sp_extents[nr_extents]; for ( i = 0; i < nr_extents; i++ ) sp_extents[i] = page_array[cur_pages+(i< 0 ) { stat_1gb_pages += done; done <<= SUPERPAGE_1GB_SHIFT; cur_pages += done; count -= done; } } if ( count != 0 ) { /* Clip count to maximum 8MB extent. */ max_pages = SUPERPAGE_2MB_NR_PFNS * 4; if ( count > max_pages ) count = max_pages; /* Clip partial superpage extents to superpage boundaries. */ if ( ((cur_pfn & (SUPERPAGE_2MB_NR_PFNS-1)) != 0) && (count > (-cur_pfn & (SUPERPAGE_2MB_NR_PFNS-1))) ) count = -cur_pfn & (SUPERPAGE_2MB_NR_PFNS-1); else if ( ((count & (SUPERPAGE_2MB_NR_PFNS-1)) != 0) && (count > SUPERPAGE_2MB_NR_PFNS) ) count &= ~(SUPERPAGE_2MB_NR_PFNS - 1); /* clip non-s.p. tail */ /* Attempt to allocate superpage extents. */ if ( ((count | cur_pfn) & (SUPERPAGE_2MB_NR_PFNS - 1)) == 0 ) { long done; unsigned long nr_extents = count >> SUPERPAGE_2MB_SHIFT; xen_pfn_t sp_extents[nr_extents]; for ( i = 0; i < nr_extents; i++ ) sp_extents[i] = page_array[cur_pages+(i< 0 ) { stat_2mb_pages += done; done <<= SUPERPAGE_2MB_SHIFT; cur_pages += done; count -= done; } } } /* Fall back to 4kB extents. */ if ( count != 0 ) { rc = xc_domain_populate_physmap_exact( xch, dom, count, 0, 0, &page_array[cur_pages]); cur_pages += count; stat_normal_pages += count; } } /* Subtract 0x20 from target_pages for the VGA "hole". Xen will * adjust the PoD cache size so that domain tot_pages will be * target_pages - 0x20 after this call. */ if ( pod_mode ) rc = xc_domain_set_pod_target(xch, dom, target_pages - 0x20, NULL, NULL, NULL); if ( rc != 0 ) { PERROR("Could not allocate memory for HVM guest."); goto error_out; } IPRINTF("PHYSICAL MEMORY ALLOCATION:\n" " 4KB PAGES: 0x%016lx\n" " 2MB PAGES: 0x%016lx\n" " 1GB PAGES: 0x%016lx\n", stat_normal_pages, stat_2mb_pages, stat_1gb_pages); if ( loadelfimage(xch, &elf, dom, page_array) != 0 ) goto error_out; if ( (hvm_info_page = xc_map_foreign_range( xch, dom, PAGE_SIZE, PROT_READ | PROT_WRITE, HVM_INFO_PFN)) == NULL ) goto error_out; build_hvm_info(hvm_info_page, v_end); munmap(hvm_info_page, PAGE_SIZE); /* Allocate and clear special pages. */ for ( i = 0; i < NR_SPECIAL_PAGES; i++ ) { xen_pfn_t pfn = special_pfn(i); rc = xc_domain_populate_physmap_exact(xch, dom, 1, 0, 0, &pfn); if ( rc != 0 ) { PERROR("Could not allocate %d'th special page.", i); goto error_out; } if ( xc_clear_domain_page(xch, dom, special_pfn(i)) ) goto error_out; } xc_set_hvm_param(xch, dom, HVM_PARAM_STORE_PFN, special_pfn(SPECIALPAGE_XENSTORE)); xc_set_hvm_param(xch, dom, HVM_PARAM_BUFIOREQ_PFN, special_pfn(SPECIALPAGE_BUFIOREQ)); xc_set_hvm_param(xch, dom, HVM_PARAM_IOREQ_PFN, special_pfn(SPECIALPAGE_IOREQ)); xc_set_hvm_param(xch, dom, HVM_PARAM_CONSOLE_PFN, special_pfn(SPECIALPAGE_CONSOLE)); /* * Identity-map page table is required for running with CR0.PG=0 when * using Intel EPT. Create a 32-bit non-PAE page directory of superpages. */ if ( (ident_pt = xc_map_foreign_range( xch, dom, PAGE_SIZE, PROT_READ | PROT_WRITE, special_pfn(SPECIALPAGE_IDENT_PT))) == NULL ) goto error_out; for ( i = 0; i < PAGE_SIZE / sizeof(*ident_pt); i++ ) ident_pt[i] = ((i << 22) | _PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE); munmap(ident_pt, PAGE_SIZE); xc_set_hvm_param(xch, dom, HVM_PARAM_IDENT_PT, special_pfn(SPECIALPAGE_IDENT_PT) << PAGE_SHIFT); /* Insert JMP instruction at address 0x0 to reach entry point. */ entry_eip = elf_uval(&elf, elf.ehdr, e_entry); if ( entry_eip != 0 ) { char *page0 = xc_map_foreign_range( xch, dom, PAGE_SIZE, PROT_READ | PROT_WRITE, 0); if ( page0 == NULL ) goto error_out; page0[0] = 0xe9; *(uint32_t *)&page0[1] = entry_eip - 5; munmap(page0, PAGE_SIZE); } free(page_array); return 0; error_out: free(page_array); return -1; } static int xc_hvm_build_internal(xc_interface *xch, uint32_t domid, int memsize, int target, char *image, unsigned long image_size) { if ( (image == NULL) || (image_size == 0) ) { ERROR("Image required"); return -1; } return setup_guest(xch, domid, memsize, target, image, image_size); } /* xc_hvm_build: * Create a domain for a virtualized Linux, using files/filenames. */ int xc_hvm_build(xc_interface *xch, uint32_t domid, int memsize, const char *image_name) { char *image; int sts; unsigned long image_size; if ( (image_name == NULL) || ((image = xc_read_image(xch, image_name, &image_size)) == NULL) ) return -1; sts = xc_hvm_build_internal(xch, domid, memsize, memsize, image, image_size); free(image); return sts; } /* xc_hvm_build_target_mem: * Create a domain for a pre-ballooned virtualized Linux, using * files/filenames. If target < memsize, domain is created with * memsize pages marked populate-on-demand, * calculating pod cache size based on target. * If target == memsize, pages are populated normally. */ int xc_hvm_build_target_mem(xc_interface *xch, uint32_t domid, int memsize, int target, const char *image_name) { char *image; int sts; unsigned long image_size; if ( (image_name == NULL) || ((image = xc_read_image(xch, image_name, &image_size)) == NULL) ) return -1; sts = xc_hvm_build_internal(xch, domid, memsize, target, image, image_size); free(image); return sts; } /* xc_hvm_build_mem: * Create a domain for a virtualized Linux, using memory buffers. */ int xc_hvm_build_mem(xc_interface *xch, uint32_t domid, int memsize, const char *image_buffer, unsigned long image_size) { int sts; unsigned long img_len; char *img; /* Validate that there is a kernel buffer */ if ( (image_buffer == NULL) || (image_size == 0) ) { ERROR("kernel image buffer not present"); return -1; } img = xc_inflate_buffer(xch, image_buffer, image_size, &img_len); if ( img == NULL ) { ERROR("unable to inflate ram disk buffer"); return -1; } sts = xc_hvm_build_internal(xch, domid, memsize, memsize, img, img_len); /* xc_inflate_buffer may return the original buffer pointer (for for already inflated buffers), so exercise some care in freeing */ if ( (img != NULL) && (img != image_buffer) ) free(img); return sts; } /* * Local variables: * mode: C * c-set-style: "BSD" * c-basic-offset: 4 * tab-width: 4 * indent-tabs-mode: nil * End: */