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a6ac8cd28117fe589dd3065c210261c191381786
xen/tools/libxc/xc_hvm_build.c
T
kaf24@firebug.cl.cam.ac.uk 4d32eea226 Fix VMX guest can not be created on PAE xen with more than 4G RAM. 
Also change v_end type from unsigned long to unsigned long long, for we
will have PAE VMX guest with more than 4G memory on PAE xen.

Signed-off-by: Xin Li <xin.b.li@intel.com>
2006-03-19 18:55:46 +01:00

675 lines
19 KiB
C
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/******************************************************************************
* xc_hvm_build.c
*/
#include <stddef.h>
#include "xg_private.h"
#define ELFSIZE 32
#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>
#define HVM_LOADER_ENTR_ADDR 0x00100000
#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 E820MAX 128
#define E820_RAM 1
#define E820_RESERVED 2
#define E820_ACPI 3
#define E820_NVS 4
#define E820_IO 16
#define E820_SHARED_PAGE 17
#define E820_XENSTORE 18
#define E820_MAP_PAGE 0x00090000
#define E820_MAP_NR_OFFSET 0x000001E8
#define E820_MAP_OFFSET 0x000002D0
struct e820entry {
uint64_t addr;
uint64_t size;
uint32_t type;
} __attribute__((packed));
#define round_pgup(_p) (((_p)+(PAGE_SIZE-1))&PAGE_MASK)
#define round_pgdown(_p) ((_p)&PAGE_MASK)
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 unsigned char build_e820map(void *e820_page, unsigned long long mem_size)
{
struct e820entry *e820entry =
(struct e820entry *)(((unsigned char *)e820_page) + E820_MAP_OFFSET);
unsigned char nr_map = 0;
/* XXX: Doesn't work for > 4GB yet */
e820entry[nr_map].addr = 0x0;
e820entry[nr_map].size = 0x9F800;
e820entry[nr_map].type = E820_RAM;
nr_map++;
e820entry[nr_map].addr = 0x9F800;
e820entry[nr_map].size = 0x800;
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++;
#define STATIC_PAGES 2 /* for ioreq_t and store_mfn */
/* Most of the ram goes here */
e820entry[nr_map].addr = 0x100000;
e820entry[nr_map].size = mem_size - 0x100000 - STATIC_PAGES * PAGE_SIZE;
e820entry[nr_map].type = E820_RAM;
nr_map++;
/* Statically allocated special pages */
/* For xenstore */
e820entry[nr_map].addr = mem_size - 2 * PAGE_SIZE;
e820entry[nr_map].size = PAGE_SIZE;
e820entry[nr_map].type = E820_XENSTORE;
nr_map++;
/* Shared ioreq_t page */
e820entry[nr_map].addr = mem_size - PAGE_SIZE;
e820entry[nr_map].size = PAGE_SIZE;
e820entry[nr_map].type = E820_SHARED_PAGE;
nr_map++;
e820entry[nr_map].addr = mem_size;
e820entry[nr_map].size = 0x3 * PAGE_SIZE;
e820entry[nr_map].type = E820_NVS;
nr_map++;
e820entry[nr_map].addr = mem_size + 0x3 * PAGE_SIZE;
e820entry[nr_map].size = 0xA * PAGE_SIZE;
e820entry[nr_map].type = E820_ACPI;
nr_map++;
e820entry[nr_map].addr = 0xFEC00000;
e820entry[nr_map].size = 0x1400000;
e820entry[nr_map].type = E820_IO;
nr_map++;
return (*(((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,
unsigned long *pfn_list, unsigned int vcpus,
unsigned int pae, unsigned int acpi, unsigned int apic)
{
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->apic_enabled = apic;
va_hvm->pae_enabled = pae;
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)
{
unsigned long *page_array = NULL;
unsigned long count, i;
unsigned long long ptr;
xc_mmu_t *mmu = NULL;
shared_info_t *shared_info;
void *e820_page;
unsigned char e820_map_nr;
struct domain_setup_info dsi;
unsigned long long v_end;
unsigned long shared_page_frame = 0;
shared_iopage_t *sp;
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;
printf("VIRTUAL MEMORY ARRANGEMENT:\n"
" Loaded HVM loader: %08lx->%08lx\n"
" TOTAL: %08lx->%016llx\n",
dsi.v_kernstart, dsi.v_kernend,
dsi.v_start, v_end);
printf(" ENTRY ADDRESS: %08lx\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(unsigned long))) == 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++ )
{
ptr = (unsigned long long)page_array[count] << PAGE_SHIFT;
if ( xc_add_mmu_update(xc_handle, mmu,
ptr | MMU_MACHPHYS_UPDATE, count) )
goto error_out;
}
if ( set_hvm_info(xc_handle, dom, page_array, vcpus, pae, acpi, apic) )
{
ERROR("Couldn't set hvm info for HVM guest.\n");
goto error_out;
}
if ( (e820_page = xc_map_foreign_range(
xc_handle, dom, PAGE_SIZE, PROT_READ | PROT_WRITE,
page_array[E820_MAP_PAGE >> PAGE_SHIFT])) == 0 )
goto error_out;
memset(e820_page, 0, PAGE_SIZE);
e820_map_nr = 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)) == 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_info[i].evtchn_upcall_mask = 1;
munmap(shared_info, PAGE_SIZE);
/* Populate the event channel port in the shared page */
shared_page_frame = page_array[(v_end >> PAGE_SHIFT) - 1];
if ( (sp = (shared_iopage_t *) xc_map_foreign_range(
xc_handle, dom, PAGE_SIZE, PROT_READ | PROT_WRITE,
shared_page_frame)) == 0 )
goto error_out;
memset(sp, 0, PAGE_SIZE);
/* FIXME: how about if we overflow the page here? */
for ( i = 0; i < vcpus; i++ ) {
unsigned int vp_eport;
vp_eport = xc_evtchn_alloc_unbound(xc_handle, dom, 0);
if ( vp_eport < 0 ) {
PERROR("Couldn't get unbound port from VMX guest.\n");
goto error_out;
}
sp->vcpu_iodata[i].vp_eport = vp_eport;
}
munmap(sp, PAGE_SIZE);
*store_mfn = page_array[(v_end >> PAGE_SHIFT) - 2];
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.ds = 0;
ctxt->user_regs.es = 0;
ctxt->user_regs.fs = 0;
ctxt->user_regs.gs = 0;
ctxt->user_regs.ss = 0;
ctxt->user_regs.cs = 0;
ctxt->user_regs.eip = dsi.v_kernentry;
ctxt->user_regs.edx = 0;
ctxt->user_regs.eax = 0;
ctxt->user_regs.esp = 0;
ctxt->user_regs.ebx = 0; /* startup_32 expects this to be 0 to signal boot cpu */
ctxt->user_regs.ecx = 0;
ctxt->user_regs.esi = 0;
ctxt->user_regs.edi = 0;
ctxt->user_regs.ebp = 0;
ctxt->user_regs.eflags = 0;
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)
{
dom0_op_t launch_op, op;
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;
}
op.cmd = DOM0_GETDOMAININFO;
op.u.getdomaininfo.domain = (domid_t)domid;
if ( (xc_dom0_op(xc_handle, &op) < 0) ||
((uint16_t)op.u.getdomaininfo.domain != domid) )
{
PERROR("Could not get info on domain");
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, op.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_op, 0, sizeof(launch_op) );
launch_op.u.setvcpucontext.domain = (domid_t)domid;
launch_op.u.setvcpucontext.vcpu = 0;
launch_op.u.setvcpucontext.ctxt = ctxt;
launch_op.cmd = DOM0_SETVCPUCONTEXT;
rc = xc_dom0_op(xc_handle, &launch_op);
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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