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b25e5aa958e7b4ff032c05d32dfc3de90cb2c4e4
xen/tools/libxc/xc_vmx_build.c
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/******************************************************************************
* xc_vmx_build.c
*/
#include <stddef.h>
#include "xc_private.h"
#define ELFSIZE 32
#include "xc_elf.h"
#include <stdlib.h>
#include <zlib.h>
#include <xen/io/ioreq.h>
#include "linux_boot_params.h"
#define L1_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED|_PAGE_USER)
#define L2_PROT (_PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED|_PAGE_DIRTY|_PAGE_USER)
#ifdef __x86_64__
#define L3_PROT (_PAGE_PRESENT)
#endif
#define round_pgup(_p) (((_p)+(PAGE_SIZE-1))&PAGE_MASK)
#define round_pgdown(_p) ((_p)&PAGE_MASK)
#define LINUX_BOOT_PARAMS_ADDR 0x00090000
#define LINUX_KERNEL_ENTR_ADDR 0x00100000
#define LINUX_PAGE_OFFSET 0xC0000000
static int
parseelfimage(
char *elfbase, unsigned long elfsize, struct domain_setup_info *dsi);
static int
loadelfimage(
char *elfbase, int xch, u32 dom, unsigned long *parray,
struct domain_setup_info *dsi);
static void build_e820map(struct mem_map *mem_mapp, unsigned long mem_size)
{
int nr_map = 0;
/* XXX: Doesn't work for > 4GB yet */
mem_mapp->map[nr_map].addr = 0x0;
mem_mapp->map[nr_map].size = 0x9F800;
mem_mapp->map[nr_map].type = E820_RAM;
mem_mapp->map[nr_map].caching_attr = MEMMAP_WB;
nr_map++;
mem_mapp->map[nr_map].addr = 0x9F800;
mem_mapp->map[nr_map].size = 0x800;
mem_mapp->map[nr_map].type = E820_RESERVED;
mem_mapp->map[nr_map].caching_attr = MEMMAP_UC;
nr_map++;
mem_mapp->map[nr_map].addr = 0xA0000;
mem_mapp->map[nr_map].size = 0x20000;
mem_mapp->map[nr_map].type = E820_IO;
mem_mapp->map[nr_map].caching_attr = MEMMAP_UC;
nr_map++;
mem_mapp->map[nr_map].addr = 0xF0000;
mem_mapp->map[nr_map].size = 0x10000;
mem_mapp->map[nr_map].type = E820_RESERVED;
mem_mapp->map[nr_map].caching_attr = MEMMAP_UC;
nr_map++;
#define STATIC_PAGES 2 /* for ioreq_t and store_mfn */
/* Most of the ram goes here */
mem_mapp->map[nr_map].addr = 0x100000;
mem_mapp->map[nr_map].size = mem_size - 0x100000 - STATIC_PAGES*PAGE_SIZE;
mem_mapp->map[nr_map].type = E820_RAM;
mem_mapp->map[nr_map].caching_attr = MEMMAP_WB;
nr_map++;
/* Statically allocated special pages */
/* Shared ioreq_t page */
mem_mapp->map[nr_map].addr = mem_size - PAGE_SIZE;
mem_mapp->map[nr_map].size = PAGE_SIZE;
mem_mapp->map[nr_map].type = E820_SHARED;
mem_mapp->map[nr_map].caching_attr = MEMMAP_WB;
nr_map++;
/* For xenstore */
mem_mapp->map[nr_map].addr = mem_size - 2*PAGE_SIZE;
mem_mapp->map[nr_map].size = PAGE_SIZE;
mem_mapp->map[nr_map].type = E820_XENSTORE;
mem_mapp->map[nr_map].caching_attr = MEMMAP_WB;
nr_map++;
mem_mapp->map[nr_map].addr = mem_size;
mem_mapp->map[nr_map].size = 0x3 * PAGE_SIZE;
mem_mapp->map[nr_map].type = E820_NVS;
mem_mapp->map[nr_map].caching_attr = MEMMAP_UC;
nr_map++;
mem_mapp->map[nr_map].addr = mem_size + 0x3 * PAGE_SIZE;
mem_mapp->map[nr_map].size = 0xA * PAGE_SIZE;
mem_mapp->map[nr_map].type = E820_ACPI;
mem_mapp->map[nr_map].caching_attr = MEMMAP_WB;
nr_map++;
mem_mapp->map[nr_map].addr = 0xFEC00000;
mem_mapp->map[nr_map].size = 0x1400000;
mem_mapp->map[nr_map].type = E820_IO;
mem_mapp->map[nr_map].caching_attr = MEMMAP_UC;
nr_map++;
mem_mapp->nr_map = nr_map;
}
#ifdef __i386__
static int zap_mmio_range(int xc_handle, u32 dom,
l2_pgentry_32_t *vl2tab,
unsigned long mmio_range_start,
unsigned long mmio_range_size)
{
unsigned long mmio_addr;
unsigned long mmio_range_end = mmio_range_start + mmio_range_size;
unsigned long vl2e;
l1_pgentry_32_t *vl1tab;
mmio_addr = mmio_range_start & PAGE_MASK;
for (; mmio_addr < mmio_range_end; mmio_addr += PAGE_SIZE) {
vl2e = vl2tab[l2_table_offset(mmio_addr)];
if (vl2e == 0)
continue;
vl1tab = xc_map_foreign_range(xc_handle, dom, PAGE_SIZE,
PROT_READ|PROT_WRITE, vl2e >> PAGE_SHIFT);
if (vl1tab == 0) {
PERROR("Failed zap MMIO range");
return -1;
}
vl1tab[l1_table_offset(mmio_addr)] = 0;
munmap(vl1tab, PAGE_SIZE);
}
return 0;
}
static int zap_mmio_ranges(int xc_handle, u32 dom,
unsigned long l2tab,
struct mem_map *mem_mapp)
{
int i;
l2_pgentry_32_t *vl2tab = xc_map_foreign_range(xc_handle, dom, PAGE_SIZE,
PROT_READ|PROT_WRITE,
l2tab >> PAGE_SHIFT);
if (vl2tab == 0)
return -1;
for (i = 0; i < mem_mapp->nr_map; i++) {
if ((mem_mapp->map[i].type == E820_IO)
&& (mem_mapp->map[i].caching_attr == MEMMAP_UC))
if (zap_mmio_range(xc_handle, dom, vl2tab,
mem_mapp->map[i].addr, mem_mapp->map[i].size) == -1)
return -1;
}
munmap(vl2tab, PAGE_SIZE);
return 0;
}
#else
static int zap_mmio_range(int xc_handle, u32 dom,
l3_pgentry_t *vl3tab,
unsigned long mmio_range_start,
unsigned long mmio_range_size)
{
unsigned long mmio_addr;
unsigned long mmio_range_end = mmio_range_start + mmio_range_size;
unsigned long vl2e = 0;
unsigned long vl3e;
l1_pgentry_t *vl1tab;
l2_pgentry_t *vl2tab;
mmio_addr = mmio_range_start & PAGE_MASK;
for (; mmio_addr < mmio_range_end; mmio_addr += PAGE_SIZE) {
vl3e = vl3tab[l3_table_offset(mmio_addr)];
if (vl3e == 0)
continue;
vl2tab = xc_map_foreign_range(xc_handle, dom, PAGE_SIZE,
PROT_READ|PROT_WRITE, vl3e >> PAGE_SHIFT);
if (vl2tab == 0) {
PERROR("Failed zap MMIO range");
return -1;
}
vl2e = vl2tab[l2_table_offset(mmio_addr)];
if (vl2e == 0)
continue;
vl1tab = xc_map_foreign_range(xc_handle, dom, PAGE_SIZE,
PROT_READ|PROT_WRITE, vl2e >> PAGE_SHIFT);
vl1tab[l1_table_offset(mmio_addr)] = 0;
munmap(vl2tab, PAGE_SIZE);
munmap(vl1tab, PAGE_SIZE);
}
return 0;
}
static int zap_mmio_ranges(int xc_handle, u32 dom,
unsigned long l3tab,
struct mem_map *mem_mapp)
{
int i;
l3_pgentry_t *vl3tab = xc_map_foreign_range(xc_handle, dom, PAGE_SIZE,
PROT_READ|PROT_WRITE,
l3tab >> PAGE_SHIFT);
if (vl3tab == 0)
return -1;
for (i = 0; i < mem_mapp->nr_map; i++) {
if ((mem_mapp->map[i].type == E820_IO)
&& (mem_mapp->map[i].caching_attr == MEMMAP_UC))
if (zap_mmio_range(xc_handle, dom, vl3tab,
mem_mapp->map[i].addr, mem_mapp->map[i].size) == -1)
return -1;
}
munmap(vl3tab, PAGE_SIZE);
return 0;
}
#endif
static int setup_guest(int xc_handle,
u32 dom, int memsize,
char *image, unsigned long image_size,
gzFile initrd_gfd, unsigned long initrd_len,
unsigned long nr_pages,
vcpu_guest_context_t *ctxt,
const char *cmdline,
unsigned long shared_info_frame,
unsigned int control_evtchn,
unsigned long flags,
unsigned int vcpus,
unsigned int store_evtchn,
unsigned long *store_mfn,
struct mem_map *mem_mapp
)
{
l1_pgentry_t *vl1tab=NULL, *vl1e=NULL;
l2_pgentry_t *vl2tab=NULL, *vl2e=NULL;
unsigned long *page_array = NULL;
#ifdef __x86_64__
l3_pgentry_t *vl3tab=NULL, *vl3e=NULL;
unsigned long l3tab;
#endif
unsigned long l2tab;
unsigned long l1tab;
unsigned long count, i;
shared_info_t *shared_info;
struct linux_boot_params * boot_paramsp;
__u16 * boot_gdtp;
mmu_t *mmu = NULL;
int rc;
unsigned long nr_pt_pages;
unsigned long ppt_alloc;
struct domain_setup_info dsi;
unsigned long vinitrd_start;
unsigned long vinitrd_end;
unsigned long vboot_params_start;
unsigned long vboot_params_end;
unsigned long vboot_gdt_start;
unsigned long vboot_gdt_end;
unsigned long vpt_start;
unsigned long vpt_end;
unsigned long v_end;
unsigned long shared_page_frame = 0;
shared_iopage_t *sp;
memset(&dsi, 0, sizeof(struct domain_setup_info));
if ( (rc = parseelfimage(image, image_size, &dsi)) != 0 )
goto error_out;
if ( (dsi.v_start & (PAGE_SIZE-1)) != 0 )
{
PERROR("Guest OS must load to a page boundary.\n");
goto error_out;
}
/*
* Why do we need this? The number of page-table frames depends on the
* size of the bootstrap address space. But the size of the address space
* depends on the number of page-table frames (since each one is mapped
* read-only). We have a pair of simultaneous equations in two unknowns,
* which we solve by exhaustive search.
*/
vboot_params_start = LINUX_BOOT_PARAMS_ADDR;
vboot_params_end = vboot_params_start + PAGE_SIZE;
vboot_gdt_start = vboot_params_end;
vboot_gdt_end = vboot_gdt_start + PAGE_SIZE;
/* memsize is in megabytes */
v_end = memsize << 20;
vinitrd_end = v_end - PAGE_SIZE; /* leaving the top 4k untouched for IO requests page use */
vinitrd_start = vinitrd_end - initrd_len;
vinitrd_start = vinitrd_start & (~(PAGE_SIZE - 1));
if(initrd_len == 0)
vinitrd_start = vinitrd_end = 0;
#ifdef __i386__
nr_pt_pages = 1 + ((memsize + 3) >> 2);
#else
nr_pt_pages = 5 + ((memsize + 1) >> 1);
#endif
vpt_start = v_end;
vpt_end = vpt_start + (nr_pt_pages * PAGE_SIZE);
printf("VIRTUAL MEMORY ARRANGEMENT:\n"
" Boot_params: %08lx->%08lx\n"
" boot_gdt: %08lx->%08lx\n"
" Loaded kernel: %08lx->%08lx\n"
" Init. ramdisk: %08lx->%08lx\n"
" Page tables: %08lx->%08lx\n"
" TOTAL: %08lx->%08lx\n",
vboot_params_start, vboot_params_end,
vboot_gdt_start, vboot_gdt_end,
dsi.v_kernstart, dsi.v_kernend,
vinitrd_start, vinitrd_end,
vpt_start, vpt_end,
dsi.v_start, v_end);
printf(" ENTRY ADDRESS: %08lx\n", dsi.v_kernentry);
printf(" INITRD LENGTH: %08lx\n", initrd_len);
if ( (v_end - dsi.v_start) > (nr_pages * PAGE_SIZE) )
{
printf("Initial guest OS requires too much space\n"
"(%luMB is greater than %luMB limit)\n",
(v_end-dsi.v_start)>>20, (nr_pages<<PAGE_SHIFT)>>20);
goto error_out;
}
if ( (page_array = malloc(nr_pages * sizeof(unsigned long))) == NULL )
{
PERROR("Could not allocate memory");
goto error_out;
}
if ( xc_get_pfn_list(xc_handle, dom, page_array, nr_pages) != nr_pages )
{
PERROR("Could not get the page frame list");
goto error_out;
}
loadelfimage(image, xc_handle, dom, page_array, &dsi);
/* Load the initial ramdisk image. */
if ( initrd_len != 0 )
{
for ( i = (vinitrd_start - dsi.v_start);
i < (vinitrd_end - dsi.v_start); i += PAGE_SIZE )
{
char page[PAGE_SIZE];
if ( gzread(initrd_gfd, page, PAGE_SIZE) == -1 )
{
PERROR("Error reading initrd image, could not");
goto error_out;
}
xc_copy_to_domain_page(xc_handle, dom,
page_array[i>>PAGE_SHIFT], page);
}
}
if ( (mmu = init_mmu_updates(xc_handle, dom)) == NULL )
goto error_out;
#ifdef __i386__
/* First allocate page for page dir. */
ppt_alloc = (vpt_start - dsi.v_start) >> PAGE_SHIFT;
l2tab = page_array[ppt_alloc++] << PAGE_SHIFT;
ctxt->ctrlreg[3] = l2tab;
/* Initialise the page tables. */
if ( (vl2tab = xc_map_foreign_range(xc_handle, dom, PAGE_SIZE,
PROT_READ|PROT_WRITE,
l2tab >> PAGE_SHIFT)) == NULL )
goto error_out;
memset(vl2tab, 0, PAGE_SIZE);
vl2e = &vl2tab[l2_table_offset(dsi.v_start)];
for ( count = 0; count < ((v_end-dsi.v_start)>>PAGE_SHIFT); count++ )
{
if ( ((unsigned long)vl1e & (PAGE_SIZE-1)) == 0 )
{
l1tab = page_array[ppt_alloc++] << PAGE_SHIFT;
if ( vl1tab != NULL )
munmap(vl1tab, PAGE_SIZE);
if ( (vl1tab = xc_map_foreign_range(xc_handle, dom, PAGE_SIZE,
PROT_READ|PROT_WRITE,
l1tab >> PAGE_SHIFT)) == NULL )
{
munmap(vl2tab, PAGE_SIZE);
goto error_out;
}
memset(vl1tab, 0, PAGE_SIZE);
vl1e = &vl1tab[l1_table_offset(dsi.v_start + (count<<PAGE_SHIFT))];
*vl2e++ = l1tab | L2_PROT;
}
*vl1e = (page_array[count] << PAGE_SHIFT) | L1_PROT;
vl1e++;
}
munmap(vl1tab, PAGE_SIZE);
munmap(vl2tab, PAGE_SIZE);
#else
/* First allocate pdpt */
ppt_alloc = (vpt_start - dsi.v_start) >> PAGE_SHIFT;
/* here l3tab means pdpt, only 4 entry is used */
l3tab = page_array[ppt_alloc++] << PAGE_SHIFT;
ctxt->ctrlreg[3] = l3tab;
/* Initialise the page tables. */
if ( (vl3tab = xc_map_foreign_range(xc_handle, dom, PAGE_SIZE,
PROT_READ|PROT_WRITE,
l3tab >> PAGE_SHIFT)) == NULL )
goto error_out;
memset(vl3tab, 0, PAGE_SIZE);
vl3e = &vl3tab[l3_table_offset(dsi.v_start)];
for ( count = 0; count < ((v_end-dsi.v_start)>>PAGE_SHIFT); count++ )
{
if (!(count % (1 << (L3_PAGETABLE_SHIFT - L1_PAGETABLE_SHIFT)))){
l2tab = page_array[ppt_alloc++] << PAGE_SHIFT;
if (vl2tab != NULL)
munmap(vl2tab, PAGE_SIZE);
if ( (vl2tab = xc_map_foreign_range(xc_handle, dom, PAGE_SIZE,
PROT_READ|PROT_WRITE,
l2tab >> PAGE_SHIFT)) == NULL )
goto error_out;
memset(vl2tab, 0, PAGE_SIZE);
*vl3e++ = l2tab | L3_PROT;
vl2e = &vl2tab[l2_table_offset(dsi.v_start + (count << PAGE_SHIFT))];
}
if ( ((unsigned long)vl1e & (PAGE_SIZE-1)) == 0 )
{
l1tab = page_array[ppt_alloc++] << PAGE_SHIFT;
if ( vl1tab != NULL )
munmap(vl1tab, PAGE_SIZE);
if ( (vl1tab = xc_map_foreign_range(xc_handle, dom, PAGE_SIZE,
PROT_READ|PROT_WRITE,
l1tab >> PAGE_SHIFT)) == NULL )
{
munmap(vl2tab, PAGE_SIZE);
goto error_out;
}
memset(vl1tab, 0, PAGE_SIZE);
vl1e = &vl1tab[l1_table_offset(dsi.v_start + (count<<PAGE_SHIFT))];
*vl2e++ = l1tab | L2_PROT;
}
*vl1e = (page_array[count] << PAGE_SHIFT) | L1_PROT;
vl1e++;
}
munmap(vl1tab, PAGE_SIZE);
munmap(vl2tab, PAGE_SIZE);
munmap(vl3tab, PAGE_SIZE);
#endif
/* Write the machine->phys table entries. */
for ( count = 0; count < nr_pages; count++ )
{
if ( add_mmu_update(xc_handle, mmu,
(page_array[count] << PAGE_SHIFT) |
MMU_MACHPHYS_UPDATE, count) )
goto error_out;
}
if ((boot_paramsp = xc_map_foreign_range(
xc_handle, dom, PAGE_SIZE, PROT_READ|PROT_WRITE,
page_array[(vboot_params_start-dsi.v_start)>>PAGE_SHIFT])) == 0)
goto error_out;
memset(boot_paramsp, 0, sizeof(*boot_paramsp));
strncpy((char *)boot_paramsp->cmd_line, cmdline, 0x800);
boot_paramsp->cmd_line[0x800-1] = '\0';
boot_paramsp->cmd_line_ptr = ((unsigned long) vboot_params_start) + offsetof(struct linux_boot_params, cmd_line);
boot_paramsp->setup_sects = 0;
boot_paramsp->mount_root_rdonly = 1;
boot_paramsp->swapdev = 0x0;
boot_paramsp->ramdisk_flags = 0x0;
boot_paramsp->root_dev = 0x0; /* We must tell kernel root dev by kernel command line. */
/* we don't have a ps/2 mouse now.
* 0xAA means a aux mouse is there.
* See detect_auxiliary_port() in pc_keyb.c.
*/
boot_paramsp->aux_device_info = 0x0;
boot_paramsp->header_magic[0] = 0x48; /* "H" */
boot_paramsp->header_magic[1] = 0x64; /* "d" */
boot_paramsp->header_magic[2] = 0x72; /* "r" */
boot_paramsp->header_magic[3] = 0x53; /* "S" */
boot_paramsp->protocol_version = 0x0203; /* 2.03 */
boot_paramsp->loader_type = 0x71; /* GRUB */
boot_paramsp->loader_flags = 0x1; /* loaded high */
boot_paramsp->code32_start = LINUX_KERNEL_ENTR_ADDR; /* 1MB */
boot_paramsp->initrd_start = vinitrd_start;
boot_paramsp->initrd_size = initrd_len;
i = ((memsize - 1) << 10) - 4;
boot_paramsp->alt_mem_k = i; /* alt_mem_k */
boot_paramsp->screen.overlap.ext_mem_k = i & 0xFFFF; /* ext_mem_k */
/*
* Stuff SCREAN_INFO
*/
boot_paramsp->screen.info.orig_x = 0;
boot_paramsp->screen.info.orig_y = 0;
boot_paramsp->screen.info.orig_video_page = 8;
boot_paramsp->screen.info.orig_video_mode = 3;
boot_paramsp->screen.info.orig_video_cols = 80;
boot_paramsp->screen.info.orig_video_ega_bx = 0;
boot_paramsp->screen.info.orig_video_lines = 25;
boot_paramsp->screen.info.orig_video_isVGA = 1;
boot_paramsp->screen.info.orig_video_points = 0x0010;
/* seems we may NOT stuff boot_paramsp->apm_bios_info */
/* seems we may NOT stuff boot_paramsp->drive_info */
/* seems we may NOT stuff boot_paramsp->sys_desc_table */
*((unsigned short *) &boot_paramsp->drive_info.dummy[0]) = 800;
boot_paramsp->drive_info.dummy[2] = 4;
boot_paramsp->drive_info.dummy[14] = 32;
/* memsize is in megabytes */
/* If you need to create a special e820map, comment this line
and use mem-map.sxp */
build_e820map(mem_mapp, memsize << 20);
*store_mfn = page_array[(v_end-2) >> PAGE_SHIFT];
#if defined (__i386__)
if (zap_mmio_ranges(xc_handle, dom, l2tab, mem_mapp) == -1)
#else
if (zap_mmio_ranges(xc_handle, dom, l3tab, mem_mapp) == -1)
#endif
goto error_out;
boot_paramsp->e820_map_nr = mem_mapp->nr_map;
for (i=0; i<mem_mapp->nr_map; i++) {
boot_paramsp->e820_map[i].addr = mem_mapp->map[i].addr;
boot_paramsp->e820_map[i].size = mem_mapp->map[i].size;
boot_paramsp->e820_map[i].type = mem_mapp->map[i].type;
if (mem_mapp->map[i].type == E820_SHARED)
shared_page_frame = (mem_mapp->map[i].addr >> PAGE_SHIFT);
}
munmap(boot_paramsp, PAGE_SIZE);
if ((boot_gdtp = xc_map_foreign_range(
xc_handle, dom, PAGE_SIZE, PROT_READ|PROT_WRITE,
page_array[(vboot_gdt_start-dsi.v_start)>>PAGE_SHIFT])) == 0)
goto error_out;
memset(boot_gdtp, 0, PAGE_SIZE);
boot_gdtp[12*4 + 0] = boot_gdtp[13*4 + 0] = 0xffff; /* limit */
boot_gdtp[12*4 + 1] = boot_gdtp[13*4 + 1] = 0x0000; /* base */
boot_gdtp[12*4 + 2] = 0x9a00; boot_gdtp[13*4 + 2] = 0x9200; /* perms */
boot_gdtp[12*4 + 3] = boot_gdtp[13*4 + 3] = 0x00cf; /* granu + top of limit */
munmap(boot_gdtp, PAGE_SIZE);
/* shared_info page starts its life empty. */
if ((shared_info = xc_map_foreign_range(
xc_handle, dom, PAGE_SIZE, PROT_READ|PROT_WRITE,
shared_info_frame)) == 0)
goto error_out;
memset(shared_info, 0, sizeof(shared_info_t));
/* Mask all upcalls... */
for ( i = 0; i < MAX_VIRT_CPUS; i++ )
shared_info->vcpu_data[i].evtchn_upcall_mask = 1;
munmap(shared_info, PAGE_SIZE);
/* Populate the event channel port in the shared page */
if ((sp = (shared_iopage_t *) xc_map_foreign_range(
xc_handle, dom, PAGE_SIZE, PROT_READ|PROT_WRITE,
page_array[shared_page_frame])) == 0)
goto error_out;
memset(sp, 0, PAGE_SIZE);
sp->sp_global.eport = control_evtchn;
munmap(sp, PAGE_SIZE);
/*
* Pin down l2tab addr as page dir page - causes hypervisor to provide
* correct protection for the page
*/
#ifdef __i386__
if ( pin_table(xc_handle, MMUEXT_PIN_L2_TABLE, l2tab>>PAGE_SHIFT, dom) )
goto error_out;
#endif
/* Send the page update requests down to the hypervisor. */
if ( finish_mmu_updates(xc_handle, mmu) )
goto error_out;
free(mmu);
free(page_array);
/*
* Initial register values:
*/
ctxt->user_regs.ds = 0x68;
ctxt->user_regs.es = 0x0;
ctxt->user_regs.fs = 0x0;
ctxt->user_regs.gs = 0x0;
ctxt->user_regs.ss = 0x68;
ctxt->user_regs.cs = 0x60;
ctxt->user_regs.eip = dsi.v_kernentry;
ctxt->user_regs.edx = vboot_gdt_start;
ctxt->user_regs.eax = 0x800;
ctxt->user_regs.esp = vboot_gdt_end;
ctxt->user_regs.ebx = 0; /* startup_32 expects this to be 0 to signal boot cpu */
ctxt->user_regs.ecx = mem_mapp->nr_map;
ctxt->user_regs.esi = vboot_params_start;
ctxt->user_regs.edi = vboot_params_start + 0x2d0;
ctxt->user_regs.eflags = 0;
return 0;
error_out:
free(mmu);
free(page_array);
return -1;
}
#define VMX_FEATURE_FLAG 0x20
static int vmx_identify(void)
{
int eax, ecx;
#ifdef __i386__
__asm__ __volatile__ ("pushl %%ebx; cpuid; popl %%ebx"
: "=a" (eax), "=c" (ecx)
: "0" (1)
: "dx");
#elif defined __x86_64__
__asm__ __volatile__ ("pushq %%rbx; cpuid; popq %%rbx"
: "=a" (eax), "=c" (ecx)
: "0" (1)
: "dx");
#endif
if (!(ecx & VMX_FEATURE_FLAG)) {
return -1;
}
return 0;
}
int xc_vmx_build(int xc_handle,
u32 domid,
int memsize,
const char *image_name,
struct mem_map *mem_mapp,
const char *ramdisk_name,
const char *cmdline,
unsigned int control_evtchn,
unsigned long flags,
unsigned int vcpus,
unsigned int store_evtchn,
unsigned long *store_mfn)
{
dom0_op_t launch_op, op;
int initrd_fd = -1;
gzFile initrd_gfd = NULL;
int rc, i;
vcpu_guest_context_t st_ctxt, *ctxt = &st_ctxt;
unsigned long nr_pages;
char *image = NULL;
unsigned long image_size, initrd_size=0;
if ( vmx_identify() < 0 )
{
PERROR("CPU doesn't support VMX Extensions");
goto error_out;
}
if ( (nr_pages = xc_get_tot_pages(xc_handle, domid)) < 0 )
{
PERROR("Could not find total pages for domain");
goto error_out;
}
if ( (image = xc_read_kernel_image(image_name, &image_size)) == NULL )
goto error_out;
if ( (ramdisk_name != NULL) && (strlen(ramdisk_name) != 0) )
{
if ( (initrd_fd = open(ramdisk_name, O_RDONLY)) < 0 )
{
PERROR("Could not open the initial ramdisk image");
goto error_out;
}
initrd_size = xc_get_filesz(initrd_fd);
if ( (initrd_gfd = gzdopen(initrd_fd, "rb")) == NULL )
{
PERROR("Could not allocate decompression state for initrd");
goto error_out;
}
}
if ( mlock(&st_ctxt, sizeof(st_ctxt) ) )
{
PERROR("xc_vmx_build: ctxt mlock failed");
return 1;
}
op.cmd = DOM0_GETDOMAININFO;
op.u.getdomaininfo.domain = (domid_t)domid;
if ( (do_dom0_op(xc_handle, &op) < 0) ||
((u16)op.u.getdomaininfo.domain != domid) )
{
PERROR("Could not get info on domain");
goto error_out;
}
if ( xc_domain_get_vcpu_context(xc_handle, domid, 0, ctxt) )
{
PERROR("Could not get vcpu context");
goto error_out;
}
if ( !(op.u.getdomaininfo.flags & DOMFLAGS_PAUSED) ||
(ctxt->ctrlreg[3] != 0) )
{
ERROR("Domain is already constructed");
goto error_out;
}
if ( setup_guest(xc_handle, domid, memsize, image, image_size,
initrd_gfd, initrd_size, nr_pages,
ctxt, cmdline,
op.u.getdomaininfo.shared_info_frame,
control_evtchn, flags, vcpus, store_evtchn, store_mfn,
mem_mapp) < 0 )
{
ERROR("Error constructing guest OS");
goto error_out;
}
if ( initrd_fd >= 0 )
close(initrd_fd);
if ( initrd_gfd )
gzclose(initrd_gfd);
free(image);
ctxt->flags = VGCF_VMX_GUEST;
/* FPU is set up to default initial state. */
memset(&ctxt->fpu_ctxt, 0, sizeof(ctxt->fpu_ctxt));
/* Virtual IDT is empty at start-of-day. */
for ( i = 0; i < 256; i++ )
{
ctxt->trap_ctxt[i].vector = i;
ctxt->trap_ctxt[i].cs = FLAT_KERNEL_CS;
}
/* No LDT. */
ctxt->ldt_ents = 0;
/* Use the default Xen-provided GDT. */
ctxt->gdt_ents = 0;
/* Ring 1 stack is the initial stack. */
/*
ctxt->kernel_ss = FLAT_KERNEL_DS;
ctxt->kernel_sp = vstartinfo_start;
*/
/* No debugging. */
memset(ctxt->debugreg, 0, sizeof(ctxt->debugreg));
/* No callback handlers. */
#if defined(__i386__)
ctxt->event_callback_cs = FLAT_KERNEL_CS;
ctxt->event_callback_eip = 0;
ctxt->failsafe_callback_cs = FLAT_KERNEL_CS;
ctxt->failsafe_callback_eip = 0;
#elif defined(__x86_64__)
ctxt->event_callback_eip = 0;
ctxt->failsafe_callback_eip = 0;
ctxt->syscall_callback_eip = 0;
#endif
memset( &launch_op, 0, sizeof(launch_op) );
launch_op.u.setdomaininfo.domain = (domid_t)domid;
launch_op.u.setdomaininfo.vcpu = 0;
launch_op.u.setdomaininfo.ctxt = ctxt;
launch_op.cmd = DOM0_SETDOMAININFO;
rc = do_dom0_op(xc_handle, &launch_op);
return rc;
error_out:
if ( initrd_gfd != NULL )
gzclose(initrd_gfd);
else if ( initrd_fd >= 0 )
close(initrd_fd);
free(image);
return -1;
}
static inline int is_loadable_phdr(Elf32_Phdr *phdr)
{
return ((phdr->p_type == PT_LOAD) &&
((phdr->p_flags & (PF_W|PF_X)) != 0));
}
static int parseelfimage(char *elfbase,
unsigned long elfsize,
struct domain_setup_info *dsi)
{
Elf32_Ehdr *ehdr = (Elf32_Ehdr *)elfbase;
Elf32_Phdr *phdr;
Elf32_Shdr *shdr;
unsigned long kernstart = ~0UL, kernend=0UL;
char *shstrtab;
int h;
if ( !IS_ELF(*ehdr) )
{
ERROR("Kernel image does not have an ELF header.");
return -EINVAL;
}
if ( (ehdr->e_phoff + (ehdr->e_phnum * ehdr->e_phentsize)) > elfsize )
{
ERROR("ELF program headers extend beyond end of image.");
return -EINVAL;
}
if ( (ehdr->e_shoff + (ehdr->e_shnum * ehdr->e_shentsize)) > elfsize )
{
ERROR("ELF section headers extend beyond end of image.");
return -EINVAL;
}
/* Find the section-header strings table. */
if ( ehdr->e_shstrndx == SHN_UNDEF )
{
ERROR("ELF image has no section-header strings table (shstrtab).");
return -EINVAL;
}
shdr = (Elf32_Shdr *)(elfbase + ehdr->e_shoff +
(ehdr->e_shstrndx*ehdr->e_shentsize));
shstrtab = elfbase + shdr->sh_offset;
for ( h = 0; h < ehdr->e_phnum; h++ )
{
phdr = (Elf32_Phdr *)(elfbase + ehdr->e_phoff + (h*ehdr->e_phentsize));
if ( !is_loadable_phdr(phdr) )
continue;
if ( phdr->p_paddr < kernstart )
kernstart = phdr->p_paddr;
if ( (phdr->p_paddr + phdr->p_memsz) > kernend )
kernend = phdr->p_paddr + phdr->p_memsz;
}
if ( (kernstart > kernend) ||
(ehdr->e_entry < kernstart) ||
(ehdr->e_entry > kernend) )
{
ERROR("Malformed ELF image.");
return -EINVAL;
}
dsi->v_start = 0x00000000;
dsi->v_kernstart = kernstart - LINUX_PAGE_OFFSET;
dsi->v_kernend = kernend - LINUX_PAGE_OFFSET;
dsi->v_kernentry = LINUX_KERNEL_ENTR_ADDR;
dsi->v_end = dsi->v_kernend;
return 0;
}
static int
loadelfimage(
char *elfbase, int xch, u32 dom, unsigned long *parray,
struct domain_setup_info *dsi)
{
Elf32_Ehdr *ehdr = (Elf32_Ehdr *)elfbase;
Elf32_Phdr *phdr;
int h;
char *va;
unsigned long pa, done, chunksz;
for ( h = 0; h < ehdr->e_phnum; h++ )
{
phdr = (Elf32_Phdr *)(elfbase + ehdr->e_phoff + (h*ehdr->e_phentsize));
if ( !is_loadable_phdr(phdr) )
continue;
for ( done = 0; done < phdr->p_filesz; done += chunksz )
{
pa = (phdr->p_paddr + done) - dsi->v_start - LINUX_PAGE_OFFSET;
if ((va = xc_map_foreign_range(
xch, dom, PAGE_SIZE, PROT_WRITE,
parray[pa>>PAGE_SHIFT])) == 0)
return -1;
chunksz = phdr->p_filesz - done;
if ( chunksz > (PAGE_SIZE - (pa & (PAGE_SIZE-1))) )
chunksz = PAGE_SIZE - (pa & (PAGE_SIZE-1));
memcpy(va + (pa & (PAGE_SIZE-1)),
elfbase + phdr->p_offset + done, chunksz);
munmap(va, PAGE_SIZE);
}
for ( ; done < phdr->p_memsz; done += chunksz )
{
pa = (phdr->p_paddr + done) - dsi->v_start - LINUX_PAGE_OFFSET;
if ((va = xc_map_foreign_range(
xch, dom, PAGE_SIZE, PROT_WRITE,
parray[pa>>PAGE_SHIFT])) == 0)
return -1;
chunksz = phdr->p_memsz - done;
if ( chunksz > (PAGE_SIZE - (pa & (PAGE_SIZE-1))) )
chunksz = PAGE_SIZE - (pa & (PAGE_SIZE-1));
memset(va + (pa & (PAGE_SIZE-1)), 0, chunksz);
munmap(va, PAGE_SIZE);
}
}
return 0;
}
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