[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v6 01/29] libxc: split x86 HVM setup_guest into smaller logical functions
This is just a preparatory change to clean up the code in setup_guest. Should not introduce any functional changes. Signed-off-by: Roger Pau Monnà <roger.pau@xxxxxxxxxx> Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx> Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx> Cc: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> Cc: Ian Campbell <ian.campbell@xxxxxxxxxx> Cc: Wei Liu <wei.liu2@xxxxxxxxxx> --- Changes since v3: - Add Andrew Cooper Reviewed-by. - Add Wei Acked-by. --- tools/libxc/xc_hvm_build_x86.c | 198 ++++++++++++++++++++++++----------------- 1 file changed, 117 insertions(+), 81 deletions(-) diff --git a/tools/libxc/xc_hvm_build_x86.c b/tools/libxc/xc_hvm_build_x86.c index ea250dd..4d3736b 100644 --- a/tools/libxc/xc_hvm_build_x86.c +++ b/tools/libxc/xc_hvm_build_x86.c @@ -231,28 +231,20 @@ static int check_mmio_hole(uint64_t start, uint64_t memsize, return 1; } -static int setup_guest(xc_interface *xch, - uint32_t dom, struct xc_hvm_build_args *args, - char *image, unsigned long image_size) +static int xc_hvm_populate_memory(xc_interface *xch, uint32_t dom, + struct xc_hvm_build_args *args, + xen_pfn_t *page_array) { - xen_pfn_t *page_array = NULL; unsigned long i, vmemid, nr_pages = args->mem_size >> PAGE_SHIFT; unsigned long p2m_size; unsigned long target_pages = args->mem_target >> 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; - uint64_t m_start = 0, m_end = 0; + unsigned long cur_pages, cur_pfn; int rc; xen_capabilities_info_t caps; unsigned long stat_normal_pages = 0, stat_2mb_pages = 0, stat_1gb_pages = 0; unsigned int memflags = 0; int claim_enabled = args->claim_enabled; - xen_pfn_t special_array[NR_SPECIAL_PAGES]; - xen_pfn_t ioreq_server_array[NR_IOREQ_SERVER_PAGES]; uint64_t total_pages; xen_vmemrange_t dummy_vmemrange[2]; unsigned int dummy_vnode_to_pnode[1]; @@ -260,19 +252,6 @@ static int setup_guest(xc_interface *xch, unsigned int *vnode_to_pnode; unsigned int nr_vmemranges, nr_vnodes; - memset(&elf, 0, sizeof(elf)); - if ( elf_init(&elf, image, image_size) != 0 ) - { - PERROR("Could not initialise ELF image"); - goto error_out; - } - - xc_elf_set_logfile(xch, &elf, 1); - - elf_parse_binary(&elf); - v_start = 0; - v_end = args->mem_size; - if ( nr_pages > target_pages ) memflags |= XENMEMF_populate_on_demand; @@ -345,24 +324,6 @@ static int setup_guest(xc_interface *xch, goto error_out; } - if ( modules_init(args, v_end, &elf, &m_start, &m_end) != 0 ) - { - ERROR("Insufficient space to load modules."); - goto error_out; - } - - DPRINTF("VIRTUAL MEMORY ARRANGEMENT:\n"); - DPRINTF(" Loader: %016"PRIx64"->%016"PRIx64"\n", elf.pstart, elf.pend); - DPRINTF(" Modules: %016"PRIx64"->%016"PRIx64"\n", m_start, m_end); - DPRINTF(" TOTAL: %016"PRIx64"->%016"PRIx64"\n", v_start, v_end); - DPRINTF(" ENTRY: %016"PRIx64"\n", elf_uval(&elf, elf.ehdr, e_entry)); - - if ( (page_array = malloc(p2m_size * sizeof(xen_pfn_t))) == NULL ) - { - PERROR("Could not allocate memory."); - goto error_out; - } - for ( i = 0; i < p2m_size; i++ ) page_array[i] = ((xen_pfn_t)-1); for ( vmemid = 0; vmemid < nr_vmemranges; vmemid++ ) @@ -564,7 +525,54 @@ static int setup_guest(xc_interface *xch, DPRINTF(" 4KB PAGES: 0x%016lx\n", stat_normal_pages); DPRINTF(" 2MB PAGES: 0x%016lx\n", stat_2mb_pages); DPRINTF(" 1GB PAGES: 0x%016lx\n", stat_1gb_pages); - + + rc = 0; + goto out; + error_out: + rc = -1; + out: + + /* ensure no unclaimed pages are left unused */ + xc_domain_claim_pages(xch, dom, 0 /* cancels the claim */); + + return rc; +} + +static int xc_hvm_load_image(xc_interface *xch, + uint32_t dom, struct xc_hvm_build_args *args, + xen_pfn_t *page_array) +{ + unsigned long entry_eip, image_size; + struct elf_binary elf; + uint64_t v_start, v_end; + uint64_t m_start = 0, m_end = 0; + char *image; + int rc; + + image = xc_read_image(xch, args->image_file_name, &image_size); + if ( image == NULL ) + return -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 = args->mem_size; + + if ( modules_init(args, v_end, &elf, &m_start, &m_end) != 0 ) + { + ERROR("Insufficient space to load modules."); + goto error_out; + } + + DPRINTF("VIRTUAL MEMORY ARRANGEMENT:\n"); + DPRINTF(" Loader: %016"PRIx64"->%016"PRIx64"\n", elf.pstart, elf.pend); + DPRINTF(" Modules: %016"PRIx64"->%016"PRIx64"\n", m_start, m_end); + if ( loadelfimage(xch, &elf, dom, page_array) != 0 ) { PERROR("Could not load ELF image"); @@ -577,6 +585,44 @@ static int setup_guest(xc_interface *xch, goto error_out; } + /* Insert JMP <rel32> 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); + } + + rc = 0; + goto out; + error_out: + rc = -1; + out: + if ( elf_check_broken(&elf) ) + ERROR("HVM ELF broken: %s", elf_check_broken(&elf)); + free(image); + + return rc; +} + +static int xc_hvm_populate_params(xc_interface *xch, uint32_t dom, + struct xc_hvm_build_args *args) +{ + unsigned long i; + void *hvm_info_page; + uint32_t *ident_pt; + uint64_t v_end; + int rc; + xen_pfn_t special_array[NR_SPECIAL_PAGES]; + xen_pfn_t ioreq_server_array[NR_IOREQ_SERVER_PAGES]; + + v_end = args->mem_size; + if ( (hvm_info_page = xc_map_foreign_range( xch, dom, PAGE_SIZE, PROT_READ | PROT_WRITE, HVM_INFO_PFN)) == NULL ) @@ -665,34 +711,12 @@ static int setup_guest(xc_interface *xch, xc_hvm_param_set(xch, dom, HVM_PARAM_IDENT_PT, special_pfn(SPECIALPAGE_IDENT_PT) << PAGE_SHIFT); - /* Insert JMP <rel32> 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 ) - { - PERROR("Could not map page0"); - goto error_out; - } - page0[0] = 0xe9; - *(uint32_t *)&page0[1] = entry_eip - 5; - munmap(page0, PAGE_SIZE); - } - rc = 0; goto out; error_out: rc = -1; out: - if ( elf_check_broken(&elf) ) - ERROR("HVM ELF broken: %s", elf_check_broken(&elf)); - - /* ensure no unclaimed pages are left unused */ - xc_domain_claim_pages(xch, dom, 0 /* cancels the claim */); - free(page_array); return rc; } @@ -703,9 +727,8 @@ int xc_hvm_build(xc_interface *xch, uint32_t domid, struct xc_hvm_build_args *hvm_args) { struct xc_hvm_build_args args = *hvm_args; - void *image; - unsigned long image_size; - int sts; + xen_pfn_t *parray = NULL; + int rc; if ( domid == 0 ) return -1; @@ -716,24 +739,37 @@ int xc_hvm_build(xc_interface *xch, uint32_t domid, if ( args.mem_size < (2ull << 20) || args.mem_target < (2ull << 20) ) return -1; - image = xc_read_image(xch, args.image_file_name, &image_size); - if ( image == NULL ) + parray = malloc((args.mem_size >> PAGE_SHIFT) * sizeof(xen_pfn_t)); + if ( parray == NULL ) return -1; - sts = setup_guest(xch, domid, &args, image, image_size); - - if (!sts) + rc = xc_hvm_populate_memory(xch, domid, &args, parray); + if ( rc != 0 ) { - /* Return module load addresses to caller */ - hvm_args->acpi_module.guest_addr_out = - args.acpi_module.guest_addr_out; - hvm_args->smbios_module.guest_addr_out = - args.smbios_module.guest_addr_out; + PERROR("xc_hvm_populate_memory failed"); + goto out; + } + rc = xc_hvm_load_image(xch, domid, &args, parray); + if ( rc != 0 ) + { + PERROR("xc_hvm_load_image failed"); + goto out; + } + rc = xc_hvm_populate_params(xch, domid, &args); + if ( rc != 0 ) + { + PERROR("xc_hvm_populate_params failed"); + goto out; } - free(image); + /* Return module load addresses to caller */ + hvm_args->acpi_module.guest_addr_out = args.acpi_module.guest_addr_out; + hvm_args->smbios_module.guest_addr_out = args.smbios_module.guest_addr_out; - return sts; +out: + free(parray); + + return rc; } /* xc_hvm_build_target_mem: -- 1.9.5 (Apple Git-50.3) _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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