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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] VM generation ID save/restore and migrate
# HG changeset patch
# User Paul Durrant <paul.durrant@xxxxxxxxxx>
# Date 1323250567 0
# Node ID 9eaac880f504a12c145d72a96d789dbcff33d624
# Parent 38eb74c01d9d9afacdf0c79fcb5555d99719dfa5
VM generation ID save/restore and migrate.
Add code to track the address of the VM generation id buffer across a
save/restore or migrate and increment it as necessary.
The address of the buffer is written into xenstore by hvmloader at
boot time. It must be read from xenstore by the caller of
xc_domain_save() and then written back again by the caller of
xc_domain_restore().
Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
diff -r 38eb74c01d9d -r 9eaac880f504 tools/libxc/ia64/xc_ia64_linux_restore.c
--- a/tools/libxc/ia64/xc_ia64_linux_restore.c Tue Dec 06 21:16:56 2011 +0000
+++ b/tools/libxc/ia64/xc_ia64_linux_restore.c Wed Dec 07 09:36:07 2011 +0000
@@ -548,7 +548,8 @@ int
xc_domain_restore(xc_interface *xch, int io_fd, uint32_t dom,
unsigned int store_evtchn, unsigned long *store_mfn,
unsigned int console_evtchn, unsigned long *console_mfn,
- unsigned int hvm, unsigned int pae, int superpages)
+ unsigned int hvm, unsigned int pae, int superpages,
+ int increment_gid, unsigned long *vm_gid_addr)
{
DECLARE_DOMCTL;
int rc = 1;
diff -r 38eb74c01d9d -r 9eaac880f504 tools/libxc/ia64/xc_ia64_linux_save.c
--- a/tools/libxc/ia64/xc_ia64_linux_save.c Tue Dec 06 21:16:56 2011 +0000
+++ b/tools/libxc/ia64/xc_ia64_linux_save.c Wed Dec 07 09:36:07 2011 +0000
@@ -382,7 +382,8 @@ out:
int
xc_domain_save(xc_interface *xch, int io_fd, uint32_t dom, uint32_t max_iters,
uint32_t max_factor, uint32_t flags,
- struct save_callbacks* callbacks, int hvm)
+ struct save_callbacks* callbacks, int hvm,
+ unsigned long vm_gid_addr)
{
DECLARE_DOMCTL;
xc_dominfo_t info;
diff -r 38eb74c01d9d -r 9eaac880f504 tools/libxc/xc_domain_restore.c
--- a/tools/libxc/xc_domain_restore.c Tue Dec 06 21:16:56 2011 +0000
+++ b/tools/libxc/xc_domain_restore.c Wed Dec 07 09:36:07 2011 +0000
@@ -681,6 +681,7 @@ typedef struct {
uint64_t console_pfn;
uint64_t acpi_ioport_location;
uint64_t viridian;
+ uint64_t vm_gid_addr;
} pagebuf_t;
static int pagebuf_init(pagebuf_t* buf)
@@ -860,6 +861,17 @@ static int pagebuf_get_one(xc_interface
}
return compbuf_size;
+ case XC_SAVE_ID_HVM_GENERATION_ID_ADDR:
+ /* Skip padding 4 bytes then read the generation id buffer location. */
+ if ( RDEXACT(fd, &buf->vm_gid_addr, sizeof(uint32_t)) ||
+ RDEXACT(fd, &buf->vm_gid_addr, sizeof(uint64_t)) )
+ {
+ PERROR("error read the generation id buffer location");
+ return -1;
+ }
+ DPRINTF("read generation id buffer address");
+ return pagebuf_get_one(xch, ctx, buf, fd, dom);
+
default:
if ( (count > MAX_BATCH_SIZE) || (count < 0) ) {
ERROR("Max batch size exceeded (%d). Giving up.", count);
@@ -1248,7 +1260,8 @@ static int apply_batch(xc_interface *xch
int xc_domain_restore(xc_interface *xch, int io_fd, uint32_t dom,
unsigned int store_evtchn, unsigned long *store_mfn,
unsigned int console_evtchn, unsigned long *console_mfn,
- unsigned int hvm, unsigned int pae, int superpages)
+ unsigned int hvm, unsigned int pae, int superpages,
+ int no_increment_gid, unsigned long *vm_gid_addr)
{
DECLARE_DOMCTL;
int rc = 1, frc, i, j, n, m, pae_extended_cr3 = 0, ext_vcpucontext = 0;
@@ -1449,6 +1462,39 @@ int xc_domain_restore(xc_interface *xch,
xc_set_hvm_param(xch, dom, HVM_PARAM_VM86_TSS,
pagebuf.vm86_tss);
if ( pagebuf.console_pfn )
console_pfn = pagebuf.console_pfn;
+ if ( pagebuf.vm_gid_addr ) {
+ if ( !no_increment_gid ) {
+ unsigned int offset;
+ unsigned char *buf;
+ unsigned long long gid;
+
+ /*
+ * Map the VM generation id buffer and inject the new
value.
+ */
+
+ pfn = pagebuf.vm_gid_addr >> PAGE_SHIFT;
+ offset = pagebuf.vm_gid_addr & (PAGE_SIZE - 1);
+
+ if ( (pfn >= dinfo->p2m_size) ||
+ (pfn_type[pfn] != XEN_DOMCTL_PFINFO_NOTAB) )
+ {
+ ERROR("generation id buffer frame is bad");
+ goto out;
+ }
+
+ mfn = ctx->p2m[pfn];
+ buf = xc_map_foreign_range(xch, dom, PAGE_SIZE,
+ PROT_READ | PROT_WRITE, mfn);
+
+ gid = *(unsigned long long *)(buf + offset);
+ *(unsigned long long *)(buf + offset) = gid + 1;
+
+ munmap(buf, PAGE_SIZE);
+ }
+
+ *vm_gid_addr = pagebuf.vm_gid_addr;
+ }
+
break; /* our work here is done */
}
diff -r 38eb74c01d9d -r 9eaac880f504 tools/libxc/xc_domain_save.c
--- a/tools/libxc/xc_domain_save.c Tue Dec 06 21:16:56 2011 +0000
+++ b/tools/libxc/xc_domain_save.c Wed Dec 07 09:36:07 2011 +0000
@@ -804,7 +804,8 @@ static int save_tsc_info(xc_interface *x
int xc_domain_save(xc_interface *xch, int io_fd, uint32_t dom, uint32_t
max_iters,
uint32_t max_factor, uint32_t flags,
- struct save_callbacks* callbacks, int hvm)
+ struct save_callbacks* callbacks, int hvm,
+ unsigned long vm_gid_addr)
{
xc_dominfo_t info;
DECLARE_DOMCTL;
@@ -1616,6 +1617,16 @@ int xc_domain_save(xc_interface *xch, in
uint64_t data;
} chunk = { 0, };
+ chunk.id = XC_SAVE_ID_HVM_GENERATION_ID_ADDR;
+ chunk.data = vm_gid_addr;
+
+ if ( (chunk.data != 0) &&
+ wrexact(io_fd, &chunk, sizeof(chunk)) )
+ {
+ PERROR("Error when writing the generation id buffer location for
guest");
+ goto out;
+ }
+
chunk.id = XC_SAVE_ID_HVM_IDENT_PT;
chunk.data = 0;
xc_get_hvm_param(xch, dom, HVM_PARAM_IDENT_PT,
diff -r 38eb74c01d9d -r 9eaac880f504 tools/libxc/xenguest.h
--- a/tools/libxc/xenguest.h Tue Dec 06 21:16:56 2011 +0000
+++ b/tools/libxc/xenguest.h Wed Dec 07 09:36:07 2011 +0000
@@ -58,7 +58,8 @@ struct save_callbacks {
*/
int xc_domain_save(xc_interface *xch, int io_fd, uint32_t dom, uint32_t
max_iters,
uint32_t max_factor, uint32_t flags /* XCFLAGS_xxx */,
- struct save_callbacks* callbacks, int hvm);
+ struct save_callbacks* callbacks, int hvm,
+ unsigned long vm_gid_addr);
/**
@@ -72,12 +73,15 @@ int xc_domain_save(xc_interface *xch, in
* @parm hvm non-zero if this is a HVM restore
* @parm pae non-zero if this HVM domain has PAE support enabled
* @parm superpages non-zero to allocate guest memory with superpages
+ * @parm gid the new generation id of the VM
+ * @parm vm_gid_addr returned with the address of the generation id buffer
* @return 0 on success, -1 on failure
*/
int xc_domain_restore(xc_interface *xch, int io_fd, uint32_t dom,
unsigned int store_evtchn, unsigned long *store_mfn,
unsigned int console_evtchn, unsigned long *console_mfn,
- unsigned int hvm, unsigned int pae, int superpages);
+ unsigned int hvm, unsigned int pae, int superpages,
+ int increment_gid, unsigned long *vm_gid_addr);
/**
* xc_domain_restore writes a file to disk that contains the device
* model saved state.
diff -r 38eb74c01d9d -r 9eaac880f504 tools/libxc/xg_save_restore.h
--- a/tools/libxc/xg_save_restore.h Tue Dec 06 21:16:56 2011 +0000
+++ b/tools/libxc/xg_save_restore.h Wed Dec 07 09:36:07 2011 +0000
@@ -253,6 +253,7 @@
#define XC_SAVE_ID_HVM_VIRIDIAN -11
#define XC_SAVE_ID_COMPRESSED_DATA -12 /* Marker to indicate arrival of
compressed data */
#define XC_SAVE_ID_ENABLE_COMPRESSION -13 /* Marker to enable compression
logic at receiver side */
+#define XC_SAVE_ID_HVM_GENERATION_ID_ADDR -14
/*
** We process save/restore/migrate in batches of pages; the below
diff -r 38eb74c01d9d -r 9eaac880f504 tools/libxl/libxl_create.c
--- a/tools/libxl/libxl_create.c Tue Dec 06 21:16:56 2011 +0000
+++ b/tools/libxl/libxl_create.c Wed Dec 07 09:36:07 2011 +0000
@@ -101,6 +101,7 @@ int libxl_init_build_info(libxl_ctx *ctx
b_info->u.hvm.vpt_align = 1;
b_info->u.hvm.timer_mode = 1;
b_info->u.hvm.nested_hvm = 0;
+ b_info->u.hvm.no_increment_gid = 0;
break;
case LIBXL_DOMAIN_TYPE_PV:
b_info->u.pv.slack_memkb = 8 * 1024;
diff -r 38eb74c01d9d -r 9eaac880f504 tools/libxl/libxl_dom.c
--- a/tools/libxl/libxl_dom.c Tue Dec 06 21:16:56 2011 +0000
+++ b/tools/libxl/libxl_dom.c Wed Dec 07 09:36:07 2011 +0000
@@ -125,7 +125,7 @@ int libxl__build_post(libxl__gc *gc, uin
if (info->cpuid != NULL)
libxl_cpuid_set(ctx, domid, info->cpuid);
- ents = libxl__calloc(gc, 12 + (info->max_vcpus * 2) + 2, sizeof(char *));
+ ents = libxl__calloc(gc, 14 + (info->max_vcpus * 2) + 2, sizeof(char *));
ents[0] = "memory/static-max";
ents[1] = libxl__sprintf(gc, "%d", info->max_memkb);
ents[2] = "memory/target";
@@ -138,9 +138,11 @@ int libxl__build_post(libxl__gc *gc, uin
ents[9] = libxl__sprintf(gc, "%"PRIu32, state->store_port);
ents[10] = "store/ring-ref";
ents[11] = libxl__sprintf(gc, "%lu", state->store_mfn);
+ ents[12] = "data/generation-id";
+ ents[13] = libxl__sprintf(gc, "0x%lx", state->vm_gid_addr);
for (i = 0; i < info->max_vcpus; i++) {
- ents[12+(i*2)] = libxl__sprintf(gc, "cpu/%d/availability", i);
- ents[12+(i*2)+1] = (i && info->cur_vcpus && !(info->cur_vcpus & (1 <<
i)))
+ ents[14+(i*2)] = libxl__sprintf(gc, "cpu/%d/availability", i);
+ ents[14+(i*2)+1] = (i && info->cur_vcpus && !(info->cur_vcpus & (1 <<
i)))
? "offline" : "online";
}
@@ -357,16 +359,19 @@ int libxl__domain_restore_common(libxl__
/* read signature */
int rc;
int hvm, pae, superpages;
+ int no_increment_gid;
switch (info->type) {
case LIBXL_DOMAIN_TYPE_HVM:
hvm = 1;
superpages = 1;
pae = info->u.hvm.pae;
+ no_increment_gid = info->u.hvm.no_increment_gid;
break;
case LIBXL_DOMAIN_TYPE_PV:
hvm = 0;
superpages = 0;
pae = 1;
+ no_increment_gid = 0;
break;
default:
return ERROR_INVAL;
@@ -374,7 +379,7 @@ int libxl__domain_restore_common(libxl__
rc = xc_domain_restore(ctx->xch, fd, domid,
state->store_port, &state->store_mfn,
state->console_port, &state->console_mfn,
- hvm, pae, superpages);
+ hvm, pae, superpages, no_increment_gid,
&state->vm_gid_addr);
if ( rc ) {
LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "restoring domain");
return ERROR_FAIL;
@@ -540,12 +545,22 @@ int libxl__domain_suspend_common(libxl__
struct save_callbacks callbacks;
struct suspendinfo si;
int hvm, rc = ERROR_FAIL;
+ unsigned long vm_gid_addr;
switch (type) {
- case LIBXL_DOMAIN_TYPE_HVM:
+ case LIBXL_DOMAIN_TYPE_HVM: {
+ char *path;
+ char *addr;
+
+ path = libxl__sprintf(gc, "%s/data/generation-id",
libxl__xs_get_dompath(gc, domid));
+ addr = libxl__xs_read(gc, XBT_NULL, path);
+
+ vm_gid_addr = (addr) ? strtoul(addr, NULL, 0) : 0;
hvm = 1;
break;
+ }
case LIBXL_DOMAIN_TYPE_PV:
+ vm_gid_addr = 0;
hvm = 0;
break;
default:
@@ -583,7 +598,8 @@ int libxl__domain_suspend_common(libxl__
callbacks.switch_qemu_logdirty =
libxl__domain_suspend_common_switch_qemu_logdirty;
callbacks.data = &si;
- rc = xc_domain_save(ctx->xch, fd, domid, 0, 0, flags, &callbacks, hvm);
+ rc = xc_domain_save(ctx->xch, fd, domid, 0, 0, flags, &callbacks,
+ hvm, vm_gid_addr);
if ( rc ) {
LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "saving domain: %s",
si.guest_responded ?
diff -r 38eb74c01d9d -r 9eaac880f504 tools/libxl/libxl_internal.h
--- a/tools/libxl/libxl_internal.h Tue Dec 06 21:16:56 2011 +0000
+++ b/tools/libxl/libxl_internal.h Wed Dec 07 09:36:07 2011 +0000
@@ -199,6 +199,7 @@ typedef struct {
uint32_t console_port;
unsigned long console_mfn;
+ unsigned long vm_gid_addr;
} libxl__domain_build_state;
_hidden int libxl__build_pre(libxl__gc *gc, uint32_t domid,
diff -r 38eb74c01d9d -r 9eaac880f504 tools/libxl/libxl_types.idl
--- a/tools/libxl/libxl_types.idl Tue Dec 06 21:16:56 2011 +0000
+++ b/tools/libxl/libxl_types.idl Wed Dec 07 09:36:07 2011 +0000
@@ -184,6 +184,7 @@ libxl_domain_build_info = Struct("domain
("vpt_align", bool),
("timer_mode", integer),
("nested_hvm", bool),
+ ("no_increment_gid", bool),
])),
("pv", Struct(None, [("kernel", libxl_file_reference),
("slack_memkb", uint32),
diff -r 38eb74c01d9d -r 9eaac880f504 tools/libxl/xl_cmdimpl.c
--- a/tools/libxl/xl_cmdimpl.c Tue Dec 06 21:16:56 2011 +0000
+++ b/tools/libxl/xl_cmdimpl.c Wed Dec 07 09:36:07 2011 +0000
@@ -360,6 +360,7 @@ static void printf_info(int domid,
printf("\t\t\t(vpt_align %d)\n", b_info->u.hvm.vpt_align);
printf("\t\t\t(timer_mode %d)\n", b_info->u.hvm.timer_mode);
printf("\t\t\t(nestedhvm %d)\n", b_info->u.hvm.nested_hvm);
+ printf("\t\t\t(no_increment_gid %d)\n",
b_info->u.hvm.no_increment_gid);
printf("\t\t\t(device_model %s)\n", dm_info->device_model ? :
"default");
printf("\t\t\t(videoram %d)\n", dm_info->videoram);
@@ -1362,6 +1363,7 @@ struct domain_create {
const char *restore_file;
int migrate_fd; /* -1 means none */
char **migration_domname_r; /* from malloc */
+ int no_increment_gid;
};
static int freemem(libxl_domain_build_info *b_info, libxl_device_model_info
*dm_info)
@@ -1575,6 +1577,8 @@ static int create_domain(struct domain_c
}
}
+ d_config.b_info.u.hvm.no_increment_gid = dom_info->no_increment_gid;
+
if (debug || dom_info->dryrun)
printf_info(-1, &d_config, &d_config.dm_info);
@@ -2800,6 +2804,7 @@ static void migrate_receive(int debug, i
dom_info.restore_file = "incoming migration stream";
dom_info.migrate_fd = 0; /* stdin */
dom_info.migration_domname_r = &migration_domname;
+ dom_info.no_increment_gid = 1;
rc = create_domain(&dom_info);
if (rc < 0) {
diff -r 38eb74c01d9d -r 9eaac880f504
tools/python/xen/lowlevel/checkpoint/libcheckpoint.c
--- a/tools/python/xen/lowlevel/checkpoint/libcheckpoint.c Tue Dec 06
21:16:56 2011 +0000
+++ b/tools/python/xen/lowlevel/checkpoint/libcheckpoint.c Wed Dec 07
09:36:07 2011 +0000
@@ -175,6 +175,7 @@ int checkpoint_start(checkpoint_state* s
{
int hvm, rc;
int flags = XCFLAGS_LIVE;
+ unsigned long vm_gid_addr;
if (!s->domid) {
s->errstr = "checkpoint state not opened";
@@ -185,16 +186,27 @@ int checkpoint_start(checkpoint_state* s
hvm = s->domtype > dt_pv;
if (hvm) {
+ char path[128];
+ char *addr;
+
+ sprintf(path, "/local/domain/%u/data/generation-id", s->domid);
+ addr = xs_read(s->xsh, XBT_NULL, path, NULL);
+
+ vm_gid_addr = (addr) ? strtoul(addr, NULL, 0) : 0;
+ free(addr);
+
flags |= XCFLAGS_HVM;
if (switch_qemu_logdirty(s, 1))
return -1;
+ } else {
+ vm_gid_addr = 0;
}
if (remus_flags & CHECKPOINT_FLAGS_COMPRESSION)
flags |= XCFLAGS_CHECKPOINT_COMPRESS;
callbacks->switch_qemu_logdirty = noop_switch_logdirty;
- rc = xc_domain_save(s->xch, fd, s->domid, 0, 0, flags, callbacks, hvm);
+ rc = xc_domain_save(s->xch, fd, s->domid, 0, 0, flags, callbacks, hvm,
vm_gid_addr);
if (hvm)
switch_qemu_logdirty(s, 0);
diff -r 38eb74c01d9d -r 9eaac880f504 tools/xcutils/xc_restore.c
--- a/tools/xcutils/xc_restore.c Tue Dec 06 21:16:56 2011 +0000
+++ b/tools/xcutils/xc_restore.c Wed Dec 07 09:36:07 2011 +0000
@@ -23,11 +23,12 @@ main(int argc, char **argv)
xc_interface *xch;
int io_fd, ret;
int superpages;
- unsigned long store_mfn, console_mfn;
+ unsigned long store_mfn, console_mfn, vm_gid_addr;
+ int no_increment_gid;
- if ( (argc != 8) && (argc != 9) )
+ if ( (argc < 8) || (argc > 10) )
errx(1, "usage: %s iofd domid store_evtchn "
- "console_evtchn hvm pae apic [superpages]", argv[0]);
+ "console_evtchn hvm pae apic [superpages [no_increment_gid]]",
argv[0]);
xch = xc_interface_open(0,0,0);
if ( !xch )
@@ -40,19 +41,25 @@ main(int argc, char **argv)
hvm = atoi(argv[5]);
pae = atoi(argv[6]);
apic = atoi(argv[7]);
- if ( argc == 9 )
+ if ( argc >= 9 )
superpages = atoi(argv[8]);
else
superpages = !!hvm;
+ if ( argc >= 10 )
+ no_increment_gid = !atoi(argv[9]);
+ else
+ no_increment_gid = 0;
ret = xc_domain_restore(xch, io_fd, domid, store_evtchn, &store_mfn,
- console_evtchn, &console_mfn, hvm, pae,
superpages);
+ console_evtchn, &console_mfn, hvm, pae, superpages,
+ no_increment_gid, &vm_gid_addr);
if ( ret == 0 )
{
printf("store-mfn %li\n", store_mfn);
if ( !hvm )
printf("console-mfn %li\n", console_mfn);
+ printf("vm-gid-addr %lx\n", vm_gid_addr);
fflush(stdout);
}
diff -r 38eb74c01d9d -r 9eaac880f504 tools/xcutils/xc_save.c
--- a/tools/xcutils/xc_save.c Tue Dec 06 21:16:56 2011 +0000
+++ b/tools/xcutils/xc_save.c Wed Dec 07 09:36:07 2011 +0000
@@ -169,6 +169,10 @@ main(int argc, char **argv)
unsigned int maxit, max_f;
int io_fd, ret, port;
struct save_callbacks callbacks;
+ char path[128];
+ struct xs_handle *xs;
+ char *addr;
+ unsigned long vm_gid_addr;
if (argc != 6)
errx(1, "usage: %s iofd domid maxit maxf flags", argv[0]);
@@ -207,8 +211,21 @@ main(int argc, char **argv)
memset(&callbacks, 0, sizeof(callbacks));
callbacks.suspend = suspend;
callbacks.switch_qemu_logdirty = switch_qemu_logdirty;
+
+ sprintf(path, "/local/domain/%d/data/generation-id", si.domid);
+
+ if ((xs = xs_daemon_open()) == NULL)
+ errx(1, "Couldn't contact xenstore");
+
+ addr = xs_read(xs, XBT_NULL, path, NULL);
+
+ xs_daemon_close(xs);
+
+ vm_gid_addr = (addr) ? strtoul(addr, NULL, 0) : 0;
+ free(addr);
+
ret = xc_domain_save(si.xch, io_fd, si.domid, maxit, max_f, si.flags,
- &callbacks, !!(si.flags & XCFLAGS_HVM));
+ &callbacks, !!(si.flags & XCFLAGS_HVM), vm_gid_addr);
if (si.suspend_evtchn > 0)
xc_suspend_evtchn_release(si.xch, si.xce, si.domid, si.suspend_evtchn);
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