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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 3 of 3] VM generation ID save/restore and migrate
# HG changeset patch
# User Paul Durrant <paul.durrant@xxxxxxxxxx>
# Date 1323873288 0
# Node ID 5f0a09b7edc29076bd72bae4a53259c71545b0bf
# Parent 9618ee3b6896eb8202e737b3bb027b248af6dd70
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 9618ee3b6896 -r 5f0a09b7edc2 tools/libxc/ia64/xc_ia64_linux_restore.c
--- a/tools/libxc/ia64/xc_ia64_linux_restore.c Wed Dec 14 14:34:47 2011 +0000
+++ b/tools/libxc/ia64/xc_ia64_linux_restore.c Wed Dec 14 14:34:48 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 no_incr_generationid, unsigned long
*vm_generationid_addr)
{
DECLARE_DOMCTL;
int rc = 1;
diff -r 9618ee3b6896 -r 5f0a09b7edc2 tools/libxc/ia64/xc_ia64_linux_save.c
--- a/tools/libxc/ia64/xc_ia64_linux_save.c Wed Dec 14 14:34:47 2011 +0000
+++ b/tools/libxc/ia64/xc_ia64_linux_save.c Wed Dec 14 14:34:48 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_generationid_addr)
{
DECLARE_DOMCTL;
xc_dominfo_t info;
diff -r 9618ee3b6896 -r 5f0a09b7edc2 tools/libxc/xc_domain_restore.c
--- a/tools/libxc/xc_domain_restore.c Wed Dec 14 14:34:47 2011 +0000
+++ b/tools/libxc/xc_domain_restore.c Wed Dec 14 14:34:48 2011 +0000
@@ -681,6 +681,7 @@ typedef struct {
uint64_t console_pfn;
uint64_t acpi_ioport_location;
uint64_t viridian;
+ uint64_t vm_generationid_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_generationid_addr, sizeof(uint32_t)) ||
+ RDEXACT(fd, &buf->vm_generationid_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_incr_generationid, unsigned long
*vm_generationid_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_generationid_addr ) {
+ if ( !no_incr_generationid ) {
+ unsigned int offset;
+ unsigned char *buf;
+ unsigned long long generationid;
+
+ /*
+ * Map the VM generation id buffer and inject the new
value.
+ */
+
+ pfn = pagebuf.vm_generationid_addr >> PAGE_SHIFT;
+ offset = pagebuf.vm_generationid_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);
+
+ generationid = *(unsigned long long *)(buf + offset);
+ *(unsigned long long *)(buf + offset) = generationid + 1;
+
+ munmap(buf, PAGE_SIZE);
+ }
+
+ *vm_generationid_addr = pagebuf.vm_generationid_addr;
+ }
+
break; /* our work here is done */
}
diff -r 9618ee3b6896 -r 5f0a09b7edc2 tools/libxc/xc_domain_save.c
--- a/tools/libxc/xc_domain_save.c Wed Dec 14 14:34:47 2011 +0000
+++ b/tools/libxc/xc_domain_save.c Wed Dec 14 14:34:48 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_generationid_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_generationid_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 9618ee3b6896 -r 5f0a09b7edc2 tools/libxc/xenguest.h
--- a/tools/libxc/xenguest.h Wed Dec 14 14:34:47 2011 +0000
+++ b/tools/libxc/xenguest.h Wed Dec 14 14:34:48 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_generationid_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 no_incr_generationid non-zero if generation id is NOT to be
incremented
+ * @parm vm_generationid_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 no_incr_generationid, unsigned long
*vm_generationid_addr);
/**
* xc_domain_restore writes a file to disk that contains the device
* model saved state.
diff -r 9618ee3b6896 -r 5f0a09b7edc2 tools/libxc/xg_save_restore.h
--- a/tools/libxc/xg_save_restore.h Wed Dec 14 14:34:47 2011 +0000
+++ b/tools/libxc/xg_save_restore.h Wed Dec 14 14:34:48 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 9618ee3b6896 -r 5f0a09b7edc2 tools/libxl/libxl_create.c
--- a/tools/libxl/libxl_create.c Wed Dec 14 14:34:47 2011 +0000
+++ b/tools/libxl/libxl_create.c Wed Dec 14 14:34:48 2011 +0000
@@ -99,6 +99,7 @@ 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_incr_generationid = 0;
break;
case LIBXL_DOMAIN_TYPE_PV:
b_info->u.pv.slack_memkb = 8 * 1024;
diff -r 9618ee3b6896 -r 5f0a09b7edc2 tools/libxl/libxl_dom.c
--- a/tools/libxl/libxl_dom.c Wed Dec 14 14:34:47 2011 +0000
+++ b/tools/libxl/libxl_dom.c Wed Dec 14 14:34:48 2011 +0000
@@ -106,6 +106,7 @@ int libxl__build_pre(libxl__gc *gc, uint
state->store_port = xc_evtchn_alloc_unbound(ctx->xch, domid, 0);
state->console_port = xc_evtchn_alloc_unbound(ctx->xch, domid, 0);
+ state->vm_generationid_addr = 0;
return 0;
}
@@ -117,7 +118,7 @@ int libxl__build_post(libxl__gc *gc, uin
libxl_ctx *ctx = libxl__gc_owner(gc);
char *dom_path, *vm_path;
xs_transaction_t t;
- char **ents;
+ char **ents, **hvm_ents;
int i;
libxl_cpuid_apply_policy(ctx, domid);
@@ -143,6 +144,13 @@ int libxl__build_post(libxl__gc *gc, uin
? "offline" : "online";
}
+ hvm_ents = NULL;
+ if (info->type == LIBXL_DOMAIN_TYPE_HVM) {
+ hvm_ents = libxl__calloc(gc, 3, sizeof(char *));
+ hvm_ents[0] = "hvmloader/generation-id-address";
+ hvm_ents[1] = libxl__sprintf(gc, "0x%lx", state->vm_generationid_addr);
+ }
+
dom_path = libxl__xs_get_dompath(gc, domid);
if (!dom_path) {
return ERROR_FAIL;
@@ -153,6 +161,9 @@ retry_transaction:
t = xs_transaction_start(ctx->xsh);
libxl__xs_writev(gc, t, dom_path, ents);
+ if (info->type == LIBXL_DOMAIN_TYPE_HVM)
+ libxl__xs_writev(gc, t, dom_path, hvm_ents);
+
libxl__xs_writev(gc, t, dom_path, local_ents);
libxl__xs_writev(gc, t, vm_path, vms_ents);
@@ -356,16 +367,19 @@ int libxl__domain_restore_common(libxl__
/* read signature */
int rc;
int hvm, pae, superpages;
+ int no_incr_generationid;
switch (info->type) {
case LIBXL_DOMAIN_TYPE_HVM:
hvm = 1;
superpages = 1;
pae = info->u.hvm.pae;
+ no_incr_generationid = info->u.hvm.no_incr_generationid;
break;
case LIBXL_DOMAIN_TYPE_PV:
hvm = 0;
superpages = 0;
pae = 1;
+ no_incr_generationid = 0;
break;
default:
return ERROR_INVAL;
@@ -373,7 +387,8 @@ 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_incr_generationid,
+ &state->vm_generationid_addr);
if ( rc ) {
LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "restoring domain");
return ERROR_FAIL;
@@ -539,12 +554,22 @@ int libxl__domain_suspend_common(libxl__
struct save_callbacks callbacks;
struct suspendinfo si;
int hvm, rc = ERROR_FAIL;
+ unsigned long vm_generationid_addr;
switch (type) {
- case LIBXL_DOMAIN_TYPE_HVM:
+ case LIBXL_DOMAIN_TYPE_HVM: {
+ char *path;
+ char *addr;
+
+ path = libxl__sprintf(gc, "%s/hvmloader/generation-id-address",
libxl__xs_get_dompath(gc, domid));
+ addr = libxl__xs_read(gc, XBT_NULL, path);
+
+ vm_generationid_addr = (addr) ? strtoul(addr, NULL, 0) : 0;
hvm = 1;
break;
+ }
case LIBXL_DOMAIN_TYPE_PV:
+ vm_generationid_addr = 0;
hvm = 0;
break;
default:
@@ -582,7 +607,8 @@ 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_generationid_addr);
if ( rc ) {
LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "saving domain: %s",
si.guest_responded ?
diff -r 9618ee3b6896 -r 5f0a09b7edc2 tools/libxl/libxl_internal.h
--- a/tools/libxl/libxl_internal.h Wed Dec 14 14:34:47 2011 +0000
+++ b/tools/libxl/libxl_internal.h Wed Dec 14 14:34:48 2011 +0000
@@ -218,6 +218,7 @@ typedef struct {
uint32_t console_port;
unsigned long console_mfn;
+ unsigned long vm_generationid_addr;
} libxl__domain_build_state;
_hidden int libxl__build_pre(libxl__gc *gc, uint32_t domid,
diff -r 9618ee3b6896 -r 5f0a09b7edc2 tools/libxl/libxl_types.idl
--- a/tools/libxl/libxl_types.idl Wed Dec 14 14:34:47 2011 +0000
+++ b/tools/libxl/libxl_types.idl Wed Dec 14 14:34:48 2011 +0000
@@ -184,6 +184,7 @@ libxl_domain_build_info = Struct("domain
("vpt_align", bool),
("timer_mode", integer),
("nested_hvm", bool),
+ ("no_incr_generationid", bool),
])),
("pv", Struct(None, [("kernel", libxl_file_reference),
("slack_memkb", uint32),
diff -r 9618ee3b6896 -r 5f0a09b7edc2 tools/libxl/xl_cmdimpl.c
--- a/tools/libxl/xl_cmdimpl.c Wed Dec 14 14:34:47 2011 +0000
+++ b/tools/libxl/xl_cmdimpl.c Wed Dec 14 14:34:48 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_incr_generationid %d)\n",
b_info->u.hvm.no_incr_generationid);
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_incr_generationid;
};
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_incr_generationid =
dom_info->no_incr_generationid;
+
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_incr_generationid = 1;
rc = create_domain(&dom_info);
if (rc < 0) {
diff -r 9618ee3b6896 -r 5f0a09b7edc2
tools/python/xen/lowlevel/checkpoint/libcheckpoint.c
--- a/tools/python/xen/lowlevel/checkpoint/libcheckpoint.c Wed Dec 14
14:34:47 2011 +0000
+++ b/tools/python/xen/lowlevel/checkpoint/libcheckpoint.c Wed Dec 14
14:34:48 2011 +0000
@@ -175,6 +175,7 @@ int checkpoint_start(checkpoint_state* s
{
int hvm, rc;
int flags = XCFLAGS_LIVE;
+ unsigned long vm_generationid_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/hvmloader/generation-id-address",
s->domid);
+ addr = xs_read(s->xsh, XBT_NULL, path, NULL);
+
+ vm_generationid_addr = (addr) ? strtoul(addr, NULL, 0) : 0;
+ free(addr);
+
flags |= XCFLAGS_HVM;
if (switch_qemu_logdirty(s, 1))
return -1;
+ } else {
+ vm_generationid_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_generationid_addr);
if (hvm)
switch_qemu_logdirty(s, 0);
diff -r 9618ee3b6896 -r 5f0a09b7edc2 tools/xcutils/xc_restore.c
--- a/tools/xcutils/xc_restore.c Wed Dec 14 14:34:47 2011 +0000
+++ b/tools/xcutils/xc_restore.c Wed Dec 14 14:34:48 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_generationid_addr;
+ int no_incr_generationid;
- 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_incr_generationid]]", 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_incr_generationid = !atoi(argv[9]);
+ else
+ no_incr_generationid = 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_incr_generationid, &vm_generationid_addr);
if ( ret == 0 )
{
printf("store-mfn %li\n", store_mfn);
if ( !hvm )
printf("console-mfn %li\n", console_mfn);
+ printf("generation-id-address %lx\n", vm_generationid_addr);
fflush(stdout);
}
diff -r 9618ee3b6896 -r 5f0a09b7edc2 tools/xcutils/xc_save.c
--- a/tools/xcutils/xc_save.c Wed Dec 14 14:34:47 2011 +0000
+++ b/tools/xcutils/xc_save.c Wed Dec 14 14:34:48 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_generationid_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/hvmloader/generation-id-address",
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_generationid_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_generationid_addr);
if (si.suspend_evtchn > 0)
xc_suspend_evtchn_release(si.xch, si.xce, si.domid, si.suspend_evtchn);
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