On 16/01/13 16:29, David Vrabel wrote:
> This series of patches improves the kexec hypercall in the Xen
> hypervisor. It is an incomplete prototype but I posting it early for
> comments on the proposed ABI/API.
And here is a (very) simple test program and a trivial test image I have
used. This provides an example of how the libxc API can be used.
David
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <xenctrl.h>
#include <xen/kexec.h>
#include "xc_kexec.h"
extern unsigned long image;
extern unsigned long image_end;
int main(void)
{
xc_interface *xch;
unsigned long start, size;
size_t image_size;
DECLARE_HYPERCALL_BUFFER(xen_kexec_segment_t, segments);
DECLARE_HYPERCALL_BUFFER(void, image_buf);
xen_kexec_load_v2_t load;
int ret;
xch = xc_interface_open(NULL, NULL, 0);
if ( !xch )
{
perror("xc_open");
exit(1);
}
ret = xc_kexec_get_range(xch, KEXEC_RANGE_MA_CRASH, 0, &start, &size);
if ( ret )
{
perror("xc_kexec_get_range");
exit(1);
}
printf("Crash region: 0x%08lx-0x%08lx\n", start, start + size);
image_size = (void *)&image_end - (void *)ℑ
printf("Image %p-%p\n", &image, (void *)&image + image_size);
image_buf = xc_hypercall_buffer_alloc(xch, image_buf, image_size);
if ( !image_buf )
{
perror("xc_hypercall_buffer_alloc");
exit(1);
}
segments = xc_hypercall_buffer_alloc(xch, segments, sizeof(*segments) * 1);
if ( !segments )
{
perror("xc_hypercall_buffer_alloc");
exit(1);
}
memcpy(image_buf, &image, image_size);
set_xen_guest_handle(segments[0].buf, image_buf);
segments[0].size = image_size;
segments[0].dest_maddr = start;
load.type = KEXEC_TYPE_DEFAULT;
load.class = KEXEC_CLASS_32;
load.nr_segments = 1;
set_xen_guest_handle(load.segments, segments);
load.entry_maddr = start;
ret = xc_kexec_load(xch, &load);
if ( ret )
{
perror("xc_kexec_load");
exit(1);
}
xc_hypercall_buffer_free(xch, image_buf);
xc_hypercall_buffer_free(xch, segments);
ret = xc_kexec(xch, KEXEC_TYPE_DEFAULT);
if ( ret )
{
perror("xc_kexec_exec");
exit(1);
}
xc_interface_close(xch);
return 0;
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
.text
.code32
.globl image
image:
1: mov $0x3f8+5, %dx
inb %dx, %al
test $0x20, %al
je 1b
mov $0x3f8, %dx
mov $'I', %al
outb %al, %dx
hlt
.globl image_end
image_end:
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