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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v7 1/3] libxc: introduce XC_SAVE_ID_TOOLSTACK
Introduce a new save_id to save/restore toolstack specific extra
information.
Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
tools/libxc/xc_domain_restore.c | 47 ++++++++++++++++++++++++++++++++++++++-
tools/libxc/xc_domain_save.c | 17 ++++++++++++++
tools/libxc/xenguest.h | 23 ++++++++++++++++++-
tools/libxc/xg_save_restore.h | 1 +
tools/libxl/libxl_dom.c | 2 +-
tools/xcutils/xc_restore.c | 2 +-
6 files changed, 88 insertions(+), 4 deletions(-)
diff --git a/tools/libxc/xc_domain_restore.c b/tools/libxc/xc_domain_restore.c
index 3e4d518..5ad41b6 100644
--- a/tools/libxc/xc_domain_restore.c
+++ b/tools/libxc/xc_domain_restore.c
@@ -659,6 +659,11 @@ static void tailbuf_free(tailbuf_t *buf)
tailbuf_free_pv(&buf->u.pv);
}
+struct toolstack_data_t {
+ uint8_t *data;
+ uint32_t len;
+};
+
typedef struct {
void* pages;
/* pages is of length nr_physpages, pfn_types is of length nr_pages */
@@ -685,6 +690,8 @@ typedef struct {
uint64_t acpi_ioport_location;
uint64_t viridian;
uint64_t vm_generationid_addr;
+
+ struct toolstack_data_t tdata;
} pagebuf_t;
static int pagebuf_init(pagebuf_t* buf)
@@ -695,6 +702,10 @@ static int pagebuf_init(pagebuf_t* buf)
static void pagebuf_free(pagebuf_t* buf)
{
+ if (buf->tdata.data != NULL) {
+ free(buf->tdata.data);
+ buf->tdata.data = NULL;
+ }
if (buf->pages) {
free(buf->pages);
buf->pages = NULL;
@@ -863,6 +874,19 @@ static int pagebuf_get_one(xc_interface *xch, struct
restore_ctx *ctx,
}
return pagebuf_get_one(xch, ctx, buf, fd, dom);
+ case XC_SAVE_ID_TOOLSTACK:
+ {
+ RDEXACT(fd, &buf->tdata.len, sizeof(buf->tdata.len));
+ buf->tdata.data = (uint8_t*) realloc(buf->tdata.data,
buf->tdata.len);
+ if ( buf->tdata.data == NULL )
+ {
+ PERROR("error memory allocation");
+ return -1;
+ }
+ RDEXACT(fd, buf->tdata.data, buf->tdata.len);
+ return pagebuf_get_one(xch, ctx, buf, fd, dom);
+ }
+
case XC_SAVE_ID_ENABLE_COMPRESSION:
/* We cannot set compression flag directly in pagebuf structure,
* since this pagebuf still has uncompressed pages that are yet to
@@ -1299,7 +1323,8 @@ int xc_domain_restore(xc_interface *xch, int io_fd,
uint32_t dom,
unsigned long *console_mfn, domid_t console_domid,
unsigned int hvm, unsigned int pae, int superpages,
int no_incr_generationid,
- unsigned long *vm_generationid_addr)
+ unsigned long *vm_generationid_addr,
+ struct restore_callbacks *callbacks)
{
DECLARE_DOMCTL;
int rc = 1, frc, i, j, n, m, pae_extended_cr3 = 0, ext_vcpucontext = 0;
@@ -1347,6 +1372,7 @@ int xc_domain_restore(xc_interface *xch, int io_fd,
uint32_t dom,
pagebuf_t pagebuf;
tailbuf_t tailbuf, tmptail;
+ struct toolstack_data_t tdata, tdatatmp;
void* vcpup;
uint64_t console_pfn = 0;
@@ -1359,6 +1385,7 @@ int xc_domain_restore(xc_interface *xch, int io_fd,
uint32_t dom,
pagebuf_init(&pagebuf);
memset(&tailbuf, 0, sizeof(tailbuf));
tailbuf.ishvm = hvm;
+ memset(&tdata, 0, sizeof(tdata));
memset(ctx, 0, sizeof(*ctx));
@@ -1624,6 +1651,10 @@ int xc_domain_restore(xc_interface *xch, int io_fd,
uint32_t dom,
ERROR("Error, unknow acpi ioport location (%i)",
pagebuf.acpi_ioport_location);
}
+ tdatatmp = tdata;
+ tdata = pagebuf.tdata;
+ pagebuf.tdata = tdatatmp;
+
if ( ctx->last_checkpoint )
{
// DPRINTF("Last checkpoint, finishing\n");
@@ -2074,6 +2105,20 @@ int xc_domain_restore(xc_interface *xch, int io_fd,
uint32_t dom,
goto out;
finish_hvm:
+ if ( callbacks != NULL && callbacks->toolstack_restore != NULL &&
+ tdata.data != NULL )
+ {
+ if ( callbacks->toolstack_restore(dom, tdata.data, tdata.len,
+ callbacks->data) < 0 )
+ {
+ PERROR("error calling toolstack_restore");
+ free(tdata.data);
+ goto out;
+ }
+ } else if ( tdata.data != NULL )
+ ERROR("toolstack data available but no toolstack callback provided\n");
+ free(tdata.data);
+
/* Dump the QEMU state to a state file for QEMU to load */
if ( dump_qemu(xch, dom, &tailbuf.u.hvm) ) {
PERROR("Error dumping QEMU state to file");
diff --git a/tools/libxc/xc_domain_save.c b/tools/libxc/xc_domain_save.c
index a9216dd..fcc7718 100644
--- a/tools/libxc/xc_domain_save.c
+++ b/tools/libxc/xc_domain_save.c
@@ -1723,6 +1723,23 @@ int xc_domain_save(xc_interface *xch, int io_fd,
uint32_t dom, uint32_t max_iter
}
}
+ if ( callbacks != NULL && callbacks->toolstack_save != NULL )
+ {
+ int id = XC_SAVE_ID_TOOLSTACK;
+ uint8_t *buf;
+ uint32_t len;
+
+ if ( callbacks->toolstack_save(dom, &buf, &len, callbacks->data) < 0 )
+ {
+ PERROR("Error calling toolstack_save");
+ goto out;
+ }
+ wrexact(io_fd, &id, sizeof(id));
+ wrexact(io_fd, &len, sizeof(len));
+ wrexact(io_fd, buf, len);
+ free(buf);
+ }
+
if ( !callbacks->checkpoint )
{
/*
diff --git a/tools/libxc/xenguest.h b/tools/libxc/xenguest.h
index 8d885d3..6435f65 100644
--- a/tools/libxc/xenguest.h
+++ b/tools/libxc/xenguest.h
@@ -44,6 +44,14 @@ struct save_callbacks {
/* Enable qemu-dm logging dirty pages to xen */
int (*switch_qemu_logdirty)(int domid, unsigned enable, void *data); /*
HVM only */
+ /* Save toolstack specific data
+ * @param buf the buffer with the data to be saved
+ * @param len the length of the buffer
+ * The callee allocates the buffer, the caller frees it (buffer must
+ * be free'able).
+ */
+ int (*toolstack_save)(uint32_t domid, uint8_t **buf, uint32_t *len, void
*data);
+
/* to be provided as the last argument to each callback function */
void* data;
};
@@ -62,6 +70,16 @@ int xc_domain_save(xc_interface *xch, int io_fd, uint32_t
dom, uint32_t max_iter
unsigned long vm_generationid_addr);
+/* callbacks provided by xc_domain_restore */
+struct restore_callbacks {
+ /* callback to restore toolstack specific data */
+ int (*toolstack_restore)(uint32_t domid, uint8_t *buf,
+ uint32_t size, void* data);
+
+ /* to be provided as the last argument to each callback function */
+ void* data;
+};
+
/**
* This function will restore a saved domain.
*
@@ -75,6 +93,8 @@ int xc_domain_save(xc_interface *xch, int io_fd, uint32_t
dom, uint32_t max_iter
* @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
+ * @parm callbacks non-NULL to receive a callback to restore toolstack
+ * specific data
* @return 0 on success, -1 on failure
*/
int xc_domain_restore(xc_interface *xch, int io_fd, uint32_t dom,
@@ -83,7 +103,8 @@ int xc_domain_restore(xc_interface *xch, int io_fd, uint32_t
dom,
unsigned long *console_mfn, domid_t console_domid,
unsigned int hvm, unsigned int pae, int superpages,
int no_incr_generationid,
- unsigned long *vm_generationid_addr);
+ unsigned long *vm_generationid_addr,
+ struct restore_callbacks *callbacks);
/**
* xc_domain_restore writes a file to disk that contains the device
* model saved state.
diff --git a/tools/libxc/xg_save_restore.h b/tools/libxc/xg_save_restore.h
index 89f3504..04e7892 100644
--- a/tools/libxc/xg_save_restore.h
+++ b/tools/libxc/xg_save_restore.h
@@ -258,6 +258,7 @@
#define XC_SAVE_ID_HVM_PAGING_RING_PFN -15
#define XC_SAVE_ID_HVM_ACCESS_RING_PFN -16
#define XC_SAVE_ID_HVM_SHARING_RING_PFN -17
+#define XC_SAVE_ID_TOOLSTACK -18 /* Optional toolstack specific info
*/
/*
** We process save/restore/migrate in batches of pages; the below
diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
index 0bdd654..7f140b4 100644
--- a/tools/libxl/libxl_dom.c
+++ b/tools/libxl/libxl_dom.c
@@ -425,7 +425,7 @@ int libxl__domain_restore_common(libxl__gc *gc, uint32_t
domid,
state->store_domid, state->console_port,
&state->console_mfn, state->console_domid,
hvm, pae, superpages, no_incr_generationid,
- &state->vm_generationid_addr);
+ &state->vm_generationid_addr, NULL);
if ( rc ) {
LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "restoring domain");
return ERROR_FAIL;
diff --git a/tools/xcutils/xc_restore.c b/tools/xcutils/xc_restore.c
index e41a133..0235579 100644
--- a/tools/xcutils/xc_restore.c
+++ b/tools/xcutils/xc_restore.c
@@ -47,7 +47,7 @@ main(int argc, char **argv)
ret = xc_domain_restore(xch, io_fd, domid, store_evtchn, &store_mfn, 0,
console_evtchn, &console_mfn, 0, hvm, pae,
superpages,
- 0, NULL);
+ 0, NULL, NULL);
if ( ret == 0 )
{
--
1.7.2.5
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