Markus Groà wrote:
> ---
> src/libxl/libxl_conf.h | 10 +++
> src/libxl/libxl_driver.c | 184 +++++++++++++++++++++++++++++++++++++++++++++-
> 2 files changed, 191 insertions(+), 3 deletions(-)
>
> diff --git a/src/libxl/libxl_conf.h b/src/libxl/libxl_conf.h
> index f2f0d8a..e28615b 100644
> --- a/src/libxl/libxl_conf.h
> +++ b/src/libxl/libxl_conf.h
> @@ -1,5 +1,6 @@
> /*---------------------------------------------------------------------------*/
> /* Copyright (c) 2011 SUSE LINUX Products GmbH, Nuernberg, Germany.
> + * Copyright (C) 2011 Univention GmbH.
> *
> * This library is free software; you can redistribute it and/or
> * modify it under the terms of the GNU Lesser General Public
> @@ -17,6 +18,7 @@
> *
> * Authors:
> * Jim Fehlig <jfehlig@xxxxxxxxxx>
> + * Markus Groà <gross@xxxxxxxxxxxxx>
> */
> /*---------------------------------------------------------------------------*/
>
> @@ -85,6 +87,14 @@ struct _libxlDomainObjPrivate {
> int eventHdl;
> };
>
> +static const char libxlSavefileMagic[16]= "libvirt-xml\n \0 \r";
> +typedef struct _libxlSavefileHeader libxlSavefileHeader;
> +typedef libxlSavefileHeader *libxlSavefileHeaderPtr;
> +struct _libxlSavefileHeader {
> + char magic[16]; /* magic id */
> + uint32_t xmlLen; /* length of saved xml */
> +};
>
I think we should pad the header, similar to qemu driver, and provide a
version field.
> +
>
> # define libxlError(code, ...) \
> virReportErrorHelper(NULL, VIR_FROM_LIBXL, code, __FILE__, \
> diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
> index 1539385..b02d4b7 100644
> --- a/src/libxl/libxl_driver.c
> +++ b/src/libxl/libxl_driver.c
> @@ -29,6 +29,7 @@
> #include <sys/utsname.h>
> #include <math.h>
> #include <libxl.h>
> +#include <fcntl.h>
>
> #include "internal.h"
> #include "logging.h"
> @@ -60,7 +61,6 @@
>
> static libxlDriverPrivatePtr libxl_driver = NULL;
>
> -
> /* Function declarations */
> static int
> libxlVmStart(libxlDriverPrivatePtr driver,
> @@ -1555,6 +1555,184 @@ libxlDomainGetInfo(virDomainPtr dom, virDomainInfoPtr info)
> }
>
> static int
> +libxlDomainSave(virDomainPtr dom, const char * to)
> +{
> + libxlDriverPrivatePtr driver = dom->conn->privateData;
> + virDomainObjPtr vm;
> + libxlDomainObjPrivatePtr priv;
> + virDomainEventPtr event = NULL;
> + libxlSavefileHeader hdr;
> + libxl_domain_suspend_info s_info;
> + char * xml;
> + uint32_t xml_len;
> + int fd;
> + int ret = -1;
> +
> + libxlDriverLock(driver);
> + vm = virDomainFindByUUID(&driver->domains, dom->uuid);
> +
> + if (!vm) {
> + char uuidstr[VIR_UUID_STRING_BUFLEN];
> + virUUIDFormat(dom->uuid, uuidstr);
> + libxlError(VIR_ERR_NO_DOMAIN,
> + _("No domain with matching uuid '%s'"), uuidstr);
> + goto cleanup;
> + }
> +
> + if (!virDomainObjIsActive(vm)) {
> + libxlError(VIR_ERR_OPERATION_INVALID, "%s", _("Domain is not running"));
> + goto cleanup;
> + }
> +
> + priv = vm->privateData;
> +
> + if (vm->state != VIR_DOMAIN_PAUSED) {
> + memset(&s_info, 0, sizeof(s_info));
> +
> + if ((fd = virFileOpenAs(to, O_CREAT|O_TRUNC|O_WRONLY, S_IRUSR|S_IWUSR,
> + getuid(), getgid(), 0)) < 0) {
> + virReportSystemError(-fd,
> + _("Failed to create domain save file '%s'"),
> + to);
> + goto cleanup;
> + }
> +
> + if ((xml = virDomainDefFormat(vm->def, 0)) == NULL)
> + goto cleanup;
> + xml_len = strlen(xml) + 1;
> +
> + memset(&hdr, 0, sizeof(hdr));
> + memcpy(hdr.magic, libxlSavefileMagic, sizeof(hdr.magic));
> + hdr.xmlLen = xml_len;
> +
> + if (safewrite(fd, &hdr, sizeof(hdr)) != sizeof(hdr)) {
> + libxlError(VIR_ERR_OPERATION_FAILED,
> + _("Failed to write save file header"));
> + goto cleanup;
> + }
> +
> + if (safewrite(fd, xml, xml_len) != xml_len) {
> + libxlError(VIR_ERR_OPERATION_FAILED,
> + _("Failed to write xml description"));
> + goto cleanup;
> + }
> +
> + if (libxl_domain_suspend(&priv->ctx, &s_info, dom->id, fd) != 0) {
> + libxlError(VIR_ERR_INTERNAL_ERROR,
> + _("Failed to save domain '%d' with libxenlight"),
> + dom->id);
> + goto cleanup;
> + }
> +
> + event = virDomainEventNewFromObj(vm, VIR_DOMAIN_EVENT_STOPPED,
> + VIR_DOMAIN_EVENT_STOPPED_SAVED);
> +
> + if (libxlVmReap(driver, vm, 1) != 0) {
> + libxlError(VIR_ERR_INTERNAL_ERROR,
> + _("Failed to destroy domain '%d'"), dom->id);
> + goto cleanup;
> + }
> +
> + if (!vm->persistent) {
> + virDomainRemoveInactive(&driver->domains, vm);
> + vm = NULL;
> + }
> + ret = 0;
> + }
> +cleanup:
> + VIR_FREE(xml);
> + if (VIR_CLOSE(fd) < 0)
> + virReportSystemError(errno, "%s", _("cannot close file"));
> + if (vm)
> + virDomainObjUnlock(vm);
> + if (event)
> + libxlDomainEventQueue(driver, event);
> + libxlDriverUnlock(driver);
> + return ret;
> +}
> +
> +static int
> +libxlDomainRestore(virConnectPtr conn, const char * from)
> +{
> + libxlDriverPrivatePtr driver = conn->privateData;
> + virDomainDefPtr def = NULL;
> + virDomainObjPtr vm = NULL;
> + virDomainEventPtr event = NULL;
> + libxlSavefileHeader hdr;
> + char * xml = NULL;
> + int fd;
> + int ret = -1;
> +
> + libxlDriverLock(driver);
> +
> + if ((fd = virFileOpenAs(from, O_RDONLY, 0, getuid(), getgid(), 0)) < 0) {
> + libxlError(VIR_ERR_OPERATION_FAILED,
> + "%s", _("cannot read domain image"));
> + goto cleanup;
> + }
> +
> + if (saferead(fd, &hdr, sizeof(hdr)) != sizeof(hdr)) {
> + libxlError(VIR_ERR_OPERATION_FAILED,
> + "%s", _("failed to read libxl header"));
> + goto cleanup;
> + }
> +
> + if (memcmp(hdr.magic, libxlSavefileMagic, sizeof(hdr.magic))) {
> + libxlError(VIR_ERR_INVALID_ARG, "%s", _("image magic is incorrect"));
> + goto cleanup;
> + }
> +
> + if (hdr.xmlLen <= 0) {
> + libxlError(VIR_ERR_OPERATION_FAILED,
> + _("invalid XML length: %d"), hdr.xmlLen);
> + goto cleanup;
> + }
> +
> + if (VIR_ALLOC_N(xml, hdr.xmlLen) < 0) {
> + virReportOOMError();
> + goto cleanup;
> + }
> +
> + if (saferead(fd, xml, hdr.xmlLen) != hdr.xmlLen) {
> + libxlError(VIR_ERR_OPERATION_FAILED, "%s", _("failed to read XML"));
> + goto cleanup;
> + }
> +
> + if (!(def = virDomainDefParseString(driver->caps, xml, 0)))
> + goto cleanup;
> +
> + if (virDomainObjIsDuplicate(&driver->domains, def, 1) < 0)
> + goto cleanup;
> +
> + if (!(vm = virDomainAssignDef(driver->caps, &driver->domains, def, false)))
> + goto cleanup;
> +
> + def = NULL;
> +
> + ret = libxlVmStart(driver, vm, false);
>
This starts a new domain. To restore a domain, you need to use
libxl_domain_create_restore().
Regards,
Jim
> +
> + if (ret == 0) {
> + event = virDomainEventNewFromObj(vm, VIR_DOMAIN_EVENT_STARTED,
> + VIR_DOMAIN_EVENT_STARTED_RESTORED);
> + } else if (ret < 0 && !vm->persistent) {
> + virDomainRemoveInactive(&driver->domains, vm);
> + vm = NULL;
> + }
> +
> +cleanup:
> + VIR_FREE(xml);
> + virDomainDefFree(def);
> + if (VIR_CLOSE(fd) < 0)
> + virReportSystemError(errno, "%s", _("cannot close file"));
> + if (vm)
> + virDomainObjUnlock(vm);
> + if (event)
> + libxlDomainEventQueue(driver, event);
> + libxlDriverUnlock(driver);
> + return ret;
> +}
> +
> +static int
> libxlDomainSetVcpusFlags(virDomainPtr dom, unsigned int nvcpus,
> unsigned int flags)
> {
> @@ -2658,8 +2836,8 @@ static virDriver libxlDriver = {
> NULL, /* domainSetBlkioParameters */
> NULL, /* domainGetBlkioParameters */
> libxlDomainGetInfo, /* domainGetInfo */
> - NULL, /* domainSave */
> - NULL, /* domainRestore */
> + libxlDomainSave, /* domainSave */
> + libxlDomainRestore, /* domainRestore */
> NULL, /* domainCoreDump */
> libxlDomainSetVcpus, /* domainSetVcpus */
> libxlDomainSetVcpusFlags, /* domainSetVcpusFlags */
>
--
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