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2eb4f7a7dfd302d945a87c1f4bc0f98ef21ec1e2
xen/tools/libxc/xc_hvm_build.c
T
kaf24@localhost.localdomain 99deb3f2fb [XEN] Rename shadow2 to shadow and move the various source 
files into a sensible directory hierarchy.
Signed-off-by: Keir Fraser <keir@xensource.com>
2006-08-28 12:09:36 +01:00

734 lines
22 KiB
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/******************************************************************************
* xc_hvm_build.c
*/
#define ELFSIZE 32
#include <stddef.h>
#include <inttypes.h>
#include "xg_private.h"
#include "xc_private.h"
#include "xc_elf.h"
#include <stdlib.h>
#include <unistd.h>
#include <zlib.h>
#include <xen/hvm/hvm_info_table.h>
#include <xen/hvm/ioreq.h>
#include <xen/hvm/params.h>
#include <xen/hvm/e820.h>
#define HVM_LOADER_ENTR_ADDR 0x00100000
static int
parseelfimage(
char *elfbase, unsigned long elfsize, struct domain_setup_info *dsi);
static int
loadelfimage(
char *elfbase, int xch, uint32_t dom, unsigned long *parray,
struct domain_setup_info *dsi);
static void xc_set_hvm_param(int handle,
domid_t dom, int param, unsigned long value)
{
DECLARE_HYPERCALL;
xen_hvm_param_t arg;
int rc;
hypercall.op = __HYPERVISOR_hvm_op;
hypercall.arg[0] = HVMOP_set_param;
hypercall.arg[1] = (unsigned long)&arg;
arg.domid = dom;
arg.index = param;
arg.value = value;
if ( mlock(&arg, sizeof(arg)) != 0 )
{
PERROR("Could not lock memory for set parameter");
return;
}
rc = do_xen_hypercall(handle, &hypercall);
safe_munlock(&arg, sizeof(arg));
if (rc < 0)
PERROR("set HVM parameter failed (%d)", rc);
}
static void build_e820map(void *e820_page, unsigned long long mem_size)
{
struct e820entry *e820entry =
(struct e820entry *)(((unsigned char *)e820_page) + E820_MAP_OFFSET);
unsigned long long extra_mem_size = 0;
unsigned char nr_map = 0;
/*
* physical address space from HVM_BELOW_4G_RAM_END to 4G is reserved
* for PCI devices MMIO. So if HVM has more than HVM_BELOW_4G_RAM_END
* RAM, memory beyond HVM_BELOW_4G_RAM_END will go to 4G above.
*/
if ( mem_size > HVM_BELOW_4G_RAM_END ) {
extra_mem_size = mem_size - HVM_BELOW_4G_RAM_END;
mem_size = HVM_BELOW_4G_RAM_END;
}
e820entry[nr_map].addr = 0x0;
e820entry[nr_map].size = 0x9F000;
e820entry[nr_map].type = E820_RAM;
nr_map++;
e820entry[nr_map].addr = 0x9F000;
e820entry[nr_map].size = 0x1000;
e820entry[nr_map].type = E820_RESERVED;
nr_map++;
e820entry[nr_map].addr = 0xA0000;
e820entry[nr_map].size = 0x20000;
e820entry[nr_map].type = E820_IO;
nr_map++;
e820entry[nr_map].addr = 0xF0000;
e820entry[nr_map].size = 0x10000;
e820entry[nr_map].type = E820_RESERVED;
nr_map++;
/* ACPI data: 10 pages. */
#define ACPI_DATA_PAGES 10
/* ACPI NVS: 3 pages. */
#define ACPI_NVS_PAGES 3
/* buffered io page. */
#define BUFFERED_IO_PAGES 1
/* xenstore page. */
#define XENSTORE_PAGES 1
/* shared io page. */
#define SHARED_IO_PAGES 1
/* totally 16 static pages are reserved in E820 table */
/* Most of the ram goes here */
e820entry[nr_map].addr = 0x100000;
e820entry[nr_map].size = mem_size - 0x100000 - PAGE_SIZE *
(ACPI_DATA_PAGES +
ACPI_NVS_PAGES +
BUFFERED_IO_PAGES +
XENSTORE_PAGES +
SHARED_IO_PAGES);
e820entry[nr_map].type = E820_RAM;
nr_map++;
/* Statically allocated special pages */
/* For ACPI data */
e820entry[nr_map].addr = mem_size - PAGE_SIZE *
(ACPI_DATA_PAGES +
ACPI_NVS_PAGES +
BUFFERED_IO_PAGES +
XENSTORE_PAGES +
SHARED_IO_PAGES);
e820entry[nr_map].size = PAGE_SIZE * ACPI_DATA_PAGES;
e820entry[nr_map].type = E820_ACPI;
nr_map++;
/* For ACPI NVS */
e820entry[nr_map].addr = mem_size - PAGE_SIZE *
(ACPI_NVS_PAGES +
BUFFERED_IO_PAGES +
XENSTORE_PAGES +
SHARED_IO_PAGES);
e820entry[nr_map].size = PAGE_SIZE * ACPI_NVS_PAGES;
e820entry[nr_map].type = E820_NVS;
nr_map++;
/* For buffered IO requests */
e820entry[nr_map].addr = mem_size - PAGE_SIZE *
(BUFFERED_IO_PAGES +
XENSTORE_PAGES +
SHARED_IO_PAGES);
e820entry[nr_map].size = PAGE_SIZE * BUFFERED_IO_PAGES;
e820entry[nr_map].type = E820_BUFFERED_IO;
nr_map++;
/* For xenstore */
e820entry[nr_map].addr = mem_size - PAGE_SIZE *
(XENSTORE_PAGES +
SHARED_IO_PAGES);
e820entry[nr_map].size = PAGE_SIZE * XENSTORE_PAGES;
e820entry[nr_map].type = E820_XENSTORE;
nr_map++;
/* Shared ioreq_t page */
e820entry[nr_map].addr = mem_size - PAGE_SIZE * SHARED_IO_PAGES;
e820entry[nr_map].size = PAGE_SIZE * SHARED_IO_PAGES;
e820entry[nr_map].type = E820_SHARED_PAGE;
nr_map++;
e820entry[nr_map].addr = 0xFEC00000;
e820entry[nr_map].size = 0x1400000;
e820entry[nr_map].type = E820_IO;
nr_map++;
if ( extra_mem_size ) {
e820entry[nr_map].addr = (1ULL << 32);
e820entry[nr_map].size = extra_mem_size;
e820entry[nr_map].type = E820_RAM;
nr_map++;
}
*(((unsigned char *)e820_page) + E820_MAP_NR_OFFSET) = nr_map;
}
static void set_hvm_info_checksum(struct hvm_info_table *t)
{
uint8_t *ptr = (uint8_t *)t, sum = 0;
unsigned int i;
t->checksum = 0;
for (i = 0; i < t->length; i++)
sum += *ptr++;
t->checksum = -sum;
}
/*
* Use E820 reserved memory 0x9F800 to pass HVM info to hvmloader
* hvmloader will use this info to set BIOS accordingly
*/
static int set_hvm_info(int xc_handle, uint32_t dom,
xen_pfn_t *pfn_list, unsigned int vcpus,
unsigned int acpi)
{
char *va_map;
struct hvm_info_table *va_hvm;
va_map = xc_map_foreign_range(xc_handle, dom, PAGE_SIZE,
PROT_READ | PROT_WRITE,
pfn_list[HVM_INFO_PFN]);
if ( va_map == NULL )
return -1;
va_hvm = (struct hvm_info_table *)(va_map + HVM_INFO_OFFSET);
memset(va_hvm, 0, sizeof(*va_hvm));
strncpy(va_hvm->signature, "HVM INFO", 8);
va_hvm->length = sizeof(struct hvm_info_table);
va_hvm->acpi_enabled = acpi;
va_hvm->nr_vcpus = vcpus;
set_hvm_info_checksum(va_hvm);
munmap(va_map, PAGE_SIZE);
return 0;
}
static int setup_guest(int xc_handle,
uint32_t dom, int memsize,
char *image, unsigned long image_size,
unsigned long nr_pages,
vcpu_guest_context_t *ctxt,
unsigned long shared_info_frame,
unsigned int vcpus,
unsigned int pae,
unsigned int acpi,
unsigned int apic,
unsigned int store_evtchn,
unsigned long *store_mfn)
{
xen_pfn_t *page_array = NULL;
unsigned long count, i;
unsigned long long ptr;
xc_mmu_t *mmu = NULL;
shared_info_t *shared_info;
void *e820_page;
struct domain_setup_info dsi;
uint64_t v_end;
unsigned long shared_page_nr;
memset(&dsi, 0, sizeof(struct domain_setup_info));
if ( (parseelfimage(image, image_size, &dsi)) != 0 )
goto error_out;
if ( (dsi.v_kernstart & (PAGE_SIZE - 1)) != 0 )
{
PERROR("Guest OS must load to a page boundary.\n");
goto error_out;
}
/* memsize is in megabytes */
v_end = (unsigned long long)memsize << 20;
IPRINTF("VIRTUAL MEMORY ARRANGEMENT:\n"
" Loaded HVM loader: %016"PRIx64"->%016"PRIx64"\n"
" TOTAL: %016"PRIx64"->%016"PRIx64"\n",
dsi.v_kernstart, dsi.v_kernend,
dsi.v_start, v_end);
IPRINTF(" ENTRY ADDRESS: %016"PRIx64"\n", dsi.v_kernentry);
if ( (v_end - dsi.v_start) > ((unsigned long long)nr_pages << PAGE_SHIFT) )
{
PERROR("Initial guest OS requires too much space: "
"(%lluMB is greater than %lluMB limit)\n",
(unsigned long long)(v_end - dsi.v_start) >> 20,
((unsigned long long)nr_pages << PAGE_SHIFT) >> 20);
goto error_out;
}
if ( (page_array = malloc(nr_pages * sizeof(xen_pfn_t))) == NULL )
{
PERROR("Could not allocate memory.\n");
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.\n");
goto error_out;
}
loadelfimage(image, xc_handle, dom, page_array, &dsi);
if ( (mmu = xc_init_mmu_updates(xc_handle, dom)) == NULL )
goto error_out;
/* Write the machine->phys table entries. */
for ( count = 0; count < nr_pages; count++ )
{
unsigned long gpfn_count_skip;
ptr = (unsigned long long)page_array[count] << PAGE_SHIFT;
gpfn_count_skip = 0;
/*
* physical address space from HVM_BELOW_4G_RAM_END to 4G is reserved
* for PCI devices MMIO. So if HVM has more than HVM_BELOW_4G_RAM_END
* RAM, memory beyond HVM_BELOW_4G_RAM_END will go to 4G above.
*/
if ( count >= (HVM_BELOW_4G_RAM_END >> PAGE_SHIFT) )
gpfn_count_skip = HVM_BELOW_4G_MMIO_LENGTH >> PAGE_SHIFT;
if ( xc_add_mmu_update(xc_handle, mmu,
ptr | MMU_MACHPHYS_UPDATE,
count + gpfn_count_skip) )
goto error_out;
}
if ( set_hvm_info(xc_handle, dom, page_array, vcpus, acpi) )
{
ERROR("Couldn't set hvm info for HVM guest.\n");
goto error_out;
}
xc_set_hvm_param(xc_handle, dom, HVM_PARAM_PAE_ENABLED, pae);
xc_set_hvm_param(xc_handle, dom, HVM_PARAM_APIC_ENABLED, apic);
if ( (e820_page = xc_map_foreign_range(
xc_handle, dom, PAGE_SIZE, PROT_READ | PROT_WRITE,
page_array[E820_MAP_PAGE >> PAGE_SHIFT])) == NULL )
goto error_out;
memset(e820_page, 0, PAGE_SIZE);
build_e820map(e820_page, v_end);
munmap(e820_page, 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)) == NULL )
goto error_out;
memset(shared_info, 0, PAGE_SIZE);
/* Mask all upcalls... */
for ( i = 0; i < MAX_VIRT_CPUS; i++ )
shared_info->vcpu_info[i].evtchn_upcall_mask = 1;
munmap(shared_info, PAGE_SIZE);
if ( v_end > HVM_BELOW_4G_RAM_END )
shared_page_nr = (HVM_BELOW_4G_RAM_END >> PAGE_SHIFT) - 1;
else
shared_page_nr = (v_end >> PAGE_SHIFT) - 1;
*store_mfn = page_array[shared_page_nr - 1];
xc_set_hvm_param(xc_handle, dom, HVM_PARAM_STORE_PFN, shared_page_nr - 1);
xc_set_hvm_param(xc_handle, dom, HVM_PARAM_STORE_EVTCHN, store_evtchn);
/* Paranoia */
/* clean the shared IO requests page */
if ( xc_clear_domain_page(xc_handle, dom, page_array[shared_page_nr]) )
goto error_out;
/* clean the buffered IO requests page */
if ( xc_clear_domain_page(xc_handle, dom, page_array[shared_page_nr - 2]) )
goto error_out;
if ( xc_clear_domain_page(xc_handle, dom, *store_mfn) )
goto error_out;
/* Send the page update requests down to the hypervisor. */
if ( xc_finish_mmu_updates(xc_handle, mmu) )
goto error_out;
free(mmu);
free(page_array);
/*
* Initial register values:
*/
ctxt->user_regs.eip = dsi.v_kernentry;
return 0;
error_out:
free(mmu);
free(page_array);
return -1;
}
static int xc_hvm_build_internal(int xc_handle,
uint32_t domid,
int memsize,
char *image,
unsigned long image_size,
unsigned int vcpus,
unsigned int pae,
unsigned int acpi,
unsigned int apic,
unsigned int store_evtchn,
unsigned long *store_mfn)
{
struct xen_domctl launch_domctl, domctl;
int rc, i;
vcpu_guest_context_t st_ctxt, *ctxt = &st_ctxt;
unsigned long nr_pages;
xen_capabilities_info_t xen_caps;
if ( (image == NULL) || (image_size == 0) )
{
ERROR("Image required");
goto error_out;
}
if ( (rc = xc_version(xc_handle, XENVER_capabilities, &xen_caps)) != 0 )
{
PERROR("Failed to get xen version info");
goto error_out;
}
if ( !strstr(xen_caps, "hvm") )
{
PERROR("CPU doesn't support HVM extensions or "
"the extensions are not enabled");
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 ( mlock(&st_ctxt, sizeof(st_ctxt) ) )
{
PERROR("%s: ctxt mlock failed", __func__);
return 1;
}
domctl.cmd = XEN_DOMCTL_getdomaininfo;
domctl.domain = (domid_t)domid;
if ( (xc_domctl(xc_handle, &domctl) < 0) ||
((uint16_t)domctl.domain != domid) )
{
PERROR("Could not get info on domain");
goto error_out;
}
/* HVM domains must be put into shadow mode at the start of day */
if ( xc_shadow_control(xc_handle, domid, XEN_DOMCTL_SHADOW_OP_ENABLE,
NULL, 0, NULL,
XEN_DOMCTL_SHADOW_ENABLE_REFCOUNT |
XEN_DOMCTL_SHADOW_ENABLE_TRANSLATE |
XEN_DOMCTL_SHADOW_ENABLE_EXTERNAL,
NULL) )
{
PERROR("Could not enable shadow paging for domain.\n");
goto error_out;
}
memset(ctxt, 0, sizeof(*ctxt));
ctxt->flags = VGCF_HVM_GUEST;
if ( setup_guest(xc_handle, domid, memsize, image, image_size, nr_pages,
ctxt, domctl.u.getdomaininfo.shared_info_frame,
vcpus, pae, acpi, apic, store_evtchn, store_mfn) < 0)
{
ERROR("Error constructing guest OS");
goto error_out;
}
/* 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;
/* 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_domctl, 0, sizeof(launch_domctl));
launch_domctl.domain = (domid_t)domid;
launch_domctl.u.vcpucontext.vcpu = 0;
set_xen_guest_handle(launch_domctl.u.vcpucontext.ctxt, ctxt);
launch_domctl.cmd = XEN_DOMCTL_setvcpucontext;
rc = xc_domctl(xc_handle, &launch_domctl);
return rc;
error_out:
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;
dsi->v_kernend = kernend;
dsi->v_kernentry = HVM_LOADER_ENTR_ADDR;
dsi->v_end = dsi->v_kernend;
return 0;
}
static int
loadelfimage(
char *elfbase, int xch, uint32_t 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;
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;
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;
}
/* xc_hvm_build
*
* Create a domain for a virtualized Linux, using files/filenames
*
*/
int xc_hvm_build(int xc_handle,
uint32_t domid,
int memsize,
const char *image_name,
unsigned int vcpus,
unsigned int pae,
unsigned int acpi,
unsigned int apic,
unsigned int store_evtchn,
unsigned long *store_mfn)
{
char *image;
int sts;
unsigned long image_size;
if ( (image_name == NULL) ||
((image = xc_read_image(image_name, &image_size)) == NULL) )
return -1;
sts = xc_hvm_build_internal(xc_handle, domid, memsize,
image, image_size,
vcpus, pae, acpi, apic,
store_evtchn, store_mfn);
free(image);
return sts;
}
/* xc_hvm_build_mem
*
* Create a domain for a virtualized Linux, using buffers
*
*/
int xc_hvm_build_mem(int xc_handle,
uint32_t domid,
int memsize,
const char *image_buffer,
unsigned long image_size,
unsigned int vcpus,
unsigned int pae,
unsigned int acpi,
unsigned int apic,
unsigned int store_evtchn,
unsigned long *store_mfn)
{
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(image_buffer, image_size, &img_len);
if (img == NULL)
{
ERROR("unable to inflate ram disk buffer");
return -1;
}
sts = xc_hvm_build_internal(xc_handle, domid, memsize,
img, img_len,
vcpus, pae, acpi, apic,
store_evtchn, store_mfn);
/* 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:
*/
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