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Migrate VMs between different-endianess hosts

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This patch enables the migration of Qemu VMs between hosts of different endianess. I tested this by migrating a i686 VM between a x86 and ppc64 host.

I am converting the 'int's in the VM's state header to uint32_t assuming this doesn't break compatibility with existing deployments other than Linux.
This commit is contained in:
Stefan Berger 2011-04-14 14:48:03 -04:00
parent c59f3d8de4
commit cf2145d546
2 changed files with 21 additions and 5 deletions
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1
bootstrap.conf
View File

@ -21,6 +21,7 @@
gnulib_modules='
areadlink
base64
byteswap
c-ctype
c-strcase
c-strcasestr

25
src/qemu/qemu_driver.c
View File

@ -43,6 +43,7 @@
#include <sys/wait.h>
#include <sys/ioctl.h>
#include <sys/un.h>
#include <byteswap.h>
#include "qemu_driver.h"
@ -1810,13 +1811,22 @@ VIR_ENUM_IMPL(qemudSaveCompression, QEMUD_SAVE_FORMAT_LAST,
struct qemud_save_header {
char magic[sizeof(QEMUD_SAVE_MAGIC)-1];
int version;
int xml_len;
int was_running;
int compressed;
int unused[15];
uint32_t version;
uint32_t xml_len;
uint32_t was_running;
uint32_t compressed;
uint32_t unused[15];
};
static inline void
bswap_header(struct qemud_save_header *hdr) {
hdr->version = bswap_32(hdr->version);
hdr->xml_len = bswap_32(hdr->xml_len);
hdr->was_running = bswap_32(hdr->was_running);
hdr->compressed = bswap_32(hdr->compressed);
}
/* return -errno on failure, or 0 on success */
static int
qemuDomainSaveHeader(int fd, const char *path, char *xml,
@ -3025,6 +3035,11 @@ qemuDomainSaveImageOpen(struct qemud_driver *driver,
goto error;
}
if (header.version > QEMUD_SAVE_VERSION) {
/* convert endianess and try again */
bswap_header(&header);
}
if (header.version > QEMUD_SAVE_VERSION) {
qemuReportError(VIR_ERR_OPERATION_FAILED,
_("image version is not supported (%d > %d)"),