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#include "xg_private.h"
#include <stdlib.h>
#include <unistd.h>
/* number of pages to write at a time */
#define DUMP_INCREMENT (4 * 1024)
#define round_pgup(_p) (((_p)+(PAGE_SIZE-1))&PAGE_MASK)
static int
copy_from_domain_page(int xc_handle,
uint32_t domid,
unsigned long mfn,
void *dst_page)
{
void *vaddr = xc_map_foreign_range(
xc_handle, domid, PAGE_SIZE, PROT_READ, mfn);
if ( vaddr == NULL )
return -1;
memcpy(dst_page, vaddr, PAGE_SIZE);
munmap(vaddr, PAGE_SIZE);
return 0;
}
int
xc_domain_dumpcore_via_callback(int xc_handle,
uint32_t domid,
void *args,
dumpcore_rtn_t dump_rtn)
{
unsigned long nr_pages;
uint64_t *page_array = NULL;
xc_dominfo_t info;
int i, nr_vcpus = 0;
char *dump_mem, *dump_mem_start = NULL;
struct xc_core_header header;
vcpu_guest_context_t ctxt[MAX_VIRT_CPUS];
char dummy[PAGE_SIZE];
int dummy_len;
int sts;
if ( (dump_mem_start = malloc(DUMP_INCREMENT*PAGE_SIZE)) == NULL )
{
PERROR("Could not allocate dump_mem");
goto error_out;
}
if ( xc_domain_getinfo(xc_handle, domid, 1, &info) != 1 )
{
PERROR("Could not get info for domain");
goto error_out;
}
if ( domid != info.domid )
{
PERROR("Domain %d does not exist", domid);
goto error_out;
}
for ( i = 0; i <= info.max_vcpu_id; i++ )
if ( xc_vcpu_getcontext(xc_handle, domid, i, &ctxt[nr_vcpus]) == 0)
nr_vcpus++;
nr_pages = info.nr_pages;
header.xch_magic = info.hvm ? XC_CORE_MAGIC_HVM : XC_CORE_MAGIC;
header.xch_nr_vcpus = nr_vcpus;
header.xch_nr_pages = nr_pages;
header.xch_ctxt_offset = sizeof(struct xc_core_header);
header.xch_index_offset = sizeof(struct xc_core_header) +
sizeof(vcpu_guest_context_t)*nr_vcpus;
dummy_len = (sizeof(struct xc_core_header) +
(sizeof(vcpu_guest_context_t) * nr_vcpus) +
(nr_pages * sizeof(*page_array)));
header.xch_pages_offset = round_pgup(dummy_len);
sts = dump_rtn(args, (char *)&header, sizeof(struct xc_core_header));
if ( sts != 0 )
goto error_out;
sts = dump_rtn(args, (char *)&ctxt, sizeof(ctxt[0]) * nr_vcpus);
if ( sts != 0 )
goto error_out;
if ( (page_array = malloc(nr_pages * sizeof(*page_array))) == NULL )
{
IPRINTF("Could not allocate memory\n");
goto error_out;
}
if ( xc_get_pfn_list(xc_handle, domid, page_array, nr_pages) != nr_pages )
{
IPRINTF("Could not get the page frame list\n");
goto error_out;
}
sts = dump_rtn(args, (char *)page_array, nr_pages * sizeof(*page_array));
if ( sts != 0 )
goto error_out;
/* Pad the output data to page alignment. */
memset(dummy, 0, PAGE_SIZE);
sts = dump_rtn(args, dummy, header.xch_pages_offset - dummy_len);
if ( sts != 0 )
goto error_out;
for ( dump_mem = dump_mem_start, i = 0; i < nr_pages; i++ )
{
copy_from_domain_page(xc_handle, domid, page_array[i], dump_mem);
dump_mem += PAGE_SIZE;
if ( ((i + 1) % DUMP_INCREMENT == 0) || ((i + 1) == nr_pages) )
{
sts = dump_rtn(args, dump_mem_start, dump_mem - dump_mem_start);
if ( sts != 0 )
goto error_out;
dump_mem = dump_mem_start;
}
}
free(dump_mem_start);
free(page_array);
return 0;
error_out:
free(dump_mem_start);
free(page_array);
return -1;
}
/* Callback args for writing to a local dump file. */
struct dump_args {
int fd;
};
/* Callback routine for writing to a local dump file. */
static int local_file_dump(void *args, char *buffer, unsigned int length)
{
struct dump_args *da = args;
int bytes, offset;
for ( offset = 0; offset < length; offset += bytes )
{
bytes = write(da->fd, &buffer[offset], length-offset);
if ( bytes <= 0 )
{
PERROR("Failed to write buffer");
return -errno;
}
}
return 0;
}
int
xc_domain_dumpcore(int xc_handle,
uint32_t domid,
const char *corename)
{
struct dump_args da;
int sts;
if ( (da.fd = open(corename, O_CREAT|O_RDWR, S_IWUSR|S_IRUSR)) < 0 )
{
PERROR("Could not open corefile %s", corename);
return -errno;
}
sts = xc_domain_dumpcore_via_callback(
xc_handle, domid, &da, &local_file_dump);
close(da.fd);
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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