hvm: Split save.c into arch generic/specific part.

struct hvm_save_header is arch specific so that arch specific part of
hvm_save()/hvm_load() are moved into arch_hvm_save()/acrh_hvm_load()

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>

2 files changed, 219 insertions, 0 deletions

diff --git a/xen/common/hvm/Makefile b/xen/common/hvm/Makefile
new file mode 100644
index 0000000000..a464a57d52
--- /dev/null
+++ b/xen/common/hvm/Makefile
@@ -0,0 +1 @@
+obj-y += save.o
diff --git a/xen/common/hvm/save.c b/xen/common/hvm/save.c
new file mode 100644
index 0000000000..26ba8ad813
--- /dev/null
+++ b/xen/common/hvm/save.c
@@ -0,0 +1,218 @@
+/*
+ * hvm/save.c: Save and restore HVM guest's emulated hardware state.
+ *
+ * Copyright (c) 2004, Intel Corporation.
+ * Copyright (c) 2007, XenSource Inc.
+ * Copyright (c) 2007, Isaku Yamahata <yamahata at valinux co jp>
+ *                     VA Linux Systems Japan K.K.
+ *                     split arch generic part
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include <xen/config.h>
+#include <xen/lib.h>
+#include <xen/version.h>
+#include <public/version.h>
+#include <xen/sched.h>
+
+#include <asm/hvm/support.h>
+
+/* List of handlers for various HVM save and restore types */
+static struct { 
+    hvm_save_handler save;
+    hvm_load_handler load; 
+    const char *name;
+    size_t size;
+    int kind;
+} hvm_sr_handlers [HVM_SAVE_CODE_MAX + 1] = {{NULL, NULL, "<?>"},};
+
+/* Init-time function to add entries to that list */
+void hvm_register_savevm(uint16_t typecode, 
+                         const char *name,
+                         hvm_save_handler save_state,
+                         hvm_load_handler load_state,
+                         size_t size, int kind)
+{
+    ASSERT(typecode <= HVM_SAVE_CODE_MAX);
+    ASSERT(hvm_sr_handlers[typecode].save == NULL);
+    ASSERT(hvm_sr_handlers[typecode].load == NULL);
+    hvm_sr_handlers[typecode].save = save_state;
+    hvm_sr_handlers[typecode].load = load_state;
+    hvm_sr_handlers[typecode].name = name;
+    hvm_sr_handlers[typecode].size = size;
+    hvm_sr_handlers[typecode].kind = kind;
+}
+
+size_t hvm_save_size(struct domain *d) 
+{
+    struct vcpu *v;
+    size_t sz;
+    int i;
+    
+    /* Basic overhead for header and footer */
+    sz = (2 * sizeof (struct hvm_save_descriptor)) + HVM_SAVE_LENGTH(HEADER);
+
+    /* Plus space for each thing we will be saving */
+    for ( i = 0; i <= HVM_SAVE_CODE_MAX; i++ ) 
+        if ( hvm_sr_handlers[i].kind == HVMSR_PER_VCPU )
+            for_each_vcpu(d, v)
+                sz += hvm_sr_handlers[i].size;
+        else 
+            sz += hvm_sr_handlers[i].size;
+
+    return sz;
+}
+
+
+int hvm_save(struct domain *d, hvm_domain_context_t *h)
+{
+    char *c;
+    struct hvm_save_header hdr;
+    struct hvm_save_end end;
+    hvm_save_handler handler;
+    uint16_t i;
+
+    hdr.magic = HVM_FILE_MAGIC;
+    hdr.version = HVM_FILE_VERSION;
+
+    /* Save xen changeset */
+    c = strrchr(xen_changeset(), ':');
+    if ( c )
+        hdr.changeset = simple_strtoll(c, NULL, 16);
+    else 
+        hdr.changeset = -1ULL; /* Unknown */
+
+    arch_hvm_save(&hdr);
+
+    if ( hvm_save_entry(HEADER, 0, h, &hdr) != 0 )
+    {
+        gdprintk(XENLOG_ERR, "HVM save: failed to write header\n");
+        return -EFAULT;
+    } 
+
+    /* Save all available kinds of state */
+    for ( i = 0; i <= HVM_SAVE_CODE_MAX; i++ ) 
+    {
+        handler = hvm_sr_handlers[i].save;
+        if ( handler != NULL ) 
+        {
+            gdprintk(XENLOG_INFO, "HVM save: %s\n",  hvm_sr_handlers[i].name);
+            if ( handler(d, h) != 0 ) 
+            {
+                gdprintk(XENLOG_ERR, 
+                         "HVM save: failed to save type %"PRIu16"\n", i);
+                return -EFAULT;
+            } 
+        }
+    }
+
+    /* Save an end-of-file marker */
+    if ( hvm_save_entry(END, 0, h, &end) != 0 )
+    {
+        /* Run out of data */
+        gdprintk(XENLOG_ERR, "HVM save: no room for end marker.\n");
+        return -EFAULT;
+    }
+
+    /* Save macros should not have let us overrun */
+    ASSERT(h->cur <= h->size);
+    return 0;
+}
+
+int hvm_load(struct domain *d, hvm_domain_context_t *h)
+{
+    char *c;
+    uint64_t cset;
+    struct hvm_save_header hdr;
+    struct hvm_save_descriptor *desc;
+    hvm_load_handler handler;
+    struct vcpu *v;
+    
+    /* Read the save header, which must be first */
+    if ( hvm_load_entry(HEADER, h, &hdr) != 0 ) 
+        return -1;
+
+    if ( arch_hvm_load(&hdr) )
+        return -1;
+
+    c = strrchr(xen_changeset(), ':');
+    if ( hdr.changeset == -1ULL )
+        gdprintk(XENLOG_WARNING, 
+                 "HVM restore: Xen changeset was not saved.\n");
+    else if ( c == NULL )
+        gdprintk(XENLOG_WARNING, 
+                 "HVM restore: Xen changeset is not available.\n");
+    else
+    {
+        cset = simple_strtoll(c, NULL, 16);
+        if ( hdr.changeset != cset )
+        gdprintk(XENLOG_WARNING, "HVM restore: saved Xen changeset (%#"PRIx64
+                 ") does not match host (%#"PRIx64").\n", hdr.changeset, cset);
+    }
+
+    /* Down all the vcpus: we only re-enable the ones that had state saved. */
+    for_each_vcpu(d, v) 
+        if ( test_and_set_bit(_VPF_down, &v->pause_flags) )
+            vcpu_sleep_nosync(v);
+
+    for ( ; ; )
+    {
+        if ( h->size - h->cur < sizeof(struct hvm_save_descriptor) )
+        {
+            /* Run out of data */
+            gdprintk(XENLOG_ERR, 
+                     "HVM restore: save did not end with a null entry\n");
+            return -1;
+        }
+        
+        /* Read the typecode of the next entry  and check for the end-marker */
+        desc = (struct hvm_save_descriptor *)(&h->data[h->cur]);
+        if ( desc->typecode == 0 )
+            return 0; 
+        
+        /* Find the handler for this entry */
+        if ( (desc->typecode > HVM_SAVE_CODE_MAX) ||
+             ((handler = hvm_sr_handlers[desc->typecode].load) == NULL) )
+        {
+            gdprintk(XENLOG_ERR, 
+                     "HVM restore: unknown entry typecode %u\n", 
+                     desc->typecode);
+            return -1;
+        }
+
+        /* Load the entry */
+        gdprintk(XENLOG_INFO, "HVM restore: %s %"PRIu16"\n",  
+                 hvm_sr_handlers[desc->typecode].name, desc->instance);
+        if ( handler(d, h) != 0 ) 
+        {
+            gdprintk(XENLOG_ERR, 
+                     "HVM restore: failed to load entry %u/%u\n", 
+                     desc->typecode, desc->instance);
+            return -1;
+        }
+    }
+
+    /* Not reached */
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-set-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */