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[Xen-devel] [PATCH for-4.5 v6 12/16] Add dump of HVM_SAVE_CODE(VMPORT) to xen-hvmctx.



It also does some validation of the compressed data.  Currently expects
that all guest info are printable strings.

Signed-off-by: Don Slutz <dslutz@xxxxxxxxxxx>
---
 tools/misc/xen-hvmctx.c | 229 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 229 insertions(+)

diff --git a/tools/misc/xen-hvmctx.c b/tools/misc/xen-hvmctx.c
index 5a69245..d076091 100644
--- a/tools/misc/xen-hvmctx.c
+++ b/tools/misc/xen-hvmctx.c
@@ -399,6 +399,225 @@ static void dump_tsc_adjust(void)
     printf("    TSC_ADJUST: tsc_adjust %" PRIx64 "\n", p.tsc_adjust);
 }
 
+static void dump_vmport(int vmport_size)
+{
+    int i;
+    HVM_SAVE_TYPE(VMPORT) *vp;
+    int64_t vmport_guestsize;
+    uint32_t vmport_used_guestinfo;
+    uint32_t vmport_used_guestinfo_jumbo;
+    uint8_t pb[vmport_size];
+    char *p;
+    int chans_size;
+
+    READ(pb);
+    vp = (void *)&pb;
+
+    p = vp->u.packed.packed_data;
+
+    vmport_guestsize = vp->used_guestsize;
+    chans_size = vmport_size - vmport_guestsize - (p - (char *)pb);
+    if ( chans_size < 0 )
+    {
+        fprintf(stderr, "*** VMPORT: bogus chans_size=%d should be >= 0\n"
+                "   vmport_size=%d vmport_guestsize=%d fixed_size=%ld\n",
+                chans_size, vmport_size, (int)vmport_guestsize,
+                p - (char *)pb);
+        chans_size = 0;
+    }
+
+    printf("    VMPORT: ping_time %" PRIu64 "\n", vp->ping_time);
+    printf("    VMPORT: open_cookie %" PRIx32 "\n", vp->open_cookie);
+    for ( i = 0; i < VMPORT_MAX_CHANS; i++ )
+    {
+        int j;
+        vmport_channel_control_t *vc = &vp->u.packed.chan_ctl[i].chan;
+        vmport_bucket_control_t *jb =  &vp->u.packed.chan_ctl[i].jumbo;
+
+        printf("    VMPORT: chan[%d] chan_id %d\n", i, vc->chan_id);
+        printf("    VMPORT: chan[%d] active_time %" PRIx64 "\n",
+               i, vc->active_time);
+        printf("    VMPORT: chan[%d] proto_num %" PRIx32 "\n",
+               i, vc->proto_num);
+        printf("    VMPORT: chan[%d] recv_read %d\n", i, vc->recv_read);
+        printf("    VMPORT: chan[%d] recv_write %d\n", i, vc->recv_write);
+        printf("    VMPORT: chan[%d] jumbo %d\n", i, vc->jumbo);
+        printf("    VMPORT: chan[%d] send_len %d\n", i, vc->send_len);
+        if ( vc->send_len > VMPORT_MAX_SEND_BUF * 4 )
+        {
+            printf("--- VMPORT: trucated send_len=%d > %d\n",
+                   vc->send_len, VMPORT_MAX_SEND_BUF * 4);
+            vc->send_len = VMPORT_MAX_SEND_BUF * 4;
+        }
+        if ( vc->send_len > chans_size )
+        {
+            fprintf(stderr, "*** VMPORT: bogus send_len=%d > %d\n",
+                    vc->send_len, chans_size);
+            if ( chans_size >= 0 )
+                vc->send_len = chans_size;
+            else
+                vc->send_len = 0;
+        }
+        p += vc->send_len;
+        chans_size -= vc->send_len;
+        for ( j = 0; j < VMPORT_MAX_BKTS; j++ )
+        {
+            vmport_bucket_control_t *b = &vp->u.packed.chan_ctl[i].recv[j];
+
+            printf("    VMPORT: chan[%d] bucket[%d] recv_len %d\n",
+                   i, j, b->recv_len);
+            if ( b->recv_len > VMPORT_MAX_RECV_BUF * 4 )
+            {
+                printf("--- VMPORT: trucated recv_len=%d > %d\n",
+                       b->recv_len, VMPORT_MAX_RECV_BUF * 4);
+                b->recv_len = VMPORT_MAX_RECV_BUF * 4;
+            }
+            if ( b->recv_len > chans_size )
+            {
+                fprintf(stderr, "*** VMPORT: bogus recv_len=%d > %d\n",
+                        b->recv_len, chans_size);
+                if ( chans_size >= 0 )
+                    b->recv_len = chans_size;
+                else
+                    b->recv_len = 0;
+            }
+            p += b->recv_len;
+            chans_size -= b->recv_len;
+        }
+        printf("    VMPORT: chan[%d] jumbo_bkt recv_len %d\n", i, 
jb->recv_len);
+        if ( jb->recv_len > VMPORT_MAX_RECV_JUMBO_BUF * 4 )
+        {
+            printf("--- VMPORT: trucated recv_len=%d > %d\n",
+                   jb->recv_len, VMPORT_MAX_RECV_JUMBO_BUF * 4);
+            jb->recv_len = VMPORT_MAX_RECV_JUMBO_BUF * 4;
+        }
+        if ( jb->recv_len > chans_size )
+        {
+            fprintf(stderr, "*** VMPORT: bogus recv_len=%d > %d\n",
+                    jb->recv_len, chans_size);
+            if ( chans_size >= 0 )
+                jb->recv_len = chans_size;
+            else
+                jb->recv_len = 0;
+        }
+        p += jb->recv_len;
+        chans_size -= jb->recv_len;
+    }
+
+    if ( chans_size != 0 )
+        fprintf(stderr, "*** VMPORT: bogus chans_size=%d should be 0\n",
+                chans_size);
+
+    vmport_used_guestinfo = vp->used_guestinfo;
+    vmport_used_guestinfo_jumbo = vp->used_guestinfo_jumbo;
+
+    if ( vmport_used_guestinfo == 0 )
+        printf("    VMPORT: no small data\n");
+    for ( i = 0; i < vmport_used_guestinfo; i++ )
+    {
+        if ( vmport_guestsize > 0 )
+        {
+            uint8_t key_len = (uint8_t)(*p++);
+            uint8_t val_len = (uint8_t)(*p++);
+            if ( key_len )
+            {
+                char key[VMPORT_MAX_KEY_LEN + 1];
+                char val[VMPORT_MAX_VAL_LEN + 1];
+
+                if ( key_len > VMPORT_MAX_KEY_LEN )
+                {
+                    fprintf(stderr,
+                            "*** VMPORT: bogus key_len=%d > %d for 
guestinfo[%d]\n",
+                            key_len, VMPORT_MAX_KEY_LEN, i);
+                    key_len = VMPORT_MAX_KEY_LEN;
+                }
+                memcpy(key, p, key_len);
+                p += key_len;
+                key[key_len] = '\0';
+                if ( val_len > VMPORT_MAX_VAL_LEN )
+                {
+                    fprintf(stderr,
+                            "*** VMPORT: bogus val_len=%d > %d for 
guestinfo[%d]\n",
+                            val_len, VMPORT_MAX_VAL_LEN, i);
+                    val_len = VMPORT_MAX_VAL_LEN;
+                }
+                memcpy(val, p, val_len);
+                p += val_len;
+                val[val_len] = '\0';
+                vmport_guestsize -= 2 + key_len + val_len;
+                printf("    VMPORT: guestinfo[%d](%s) = \"%s\"\n",
+                       i, key, val);
+            }
+            else
+            {
+                fprintf(stderr,
+                        "*** VMPORT: bogus len for guestinfo[%d]\n",
+                        i);
+                vmport_guestsize -= 2;
+            }
+            if ( vmport_guestsize < 0 )
+                printf("    VMPORT: data length skew at guestinfo[%d]\n"
+                       "         remaining datasize=%ld\n",
+                       i, vmport_guestsize);
+        }
+    }
+
+    if ( vmport_guestsize == 0 )
+        printf("    VMPORT: no jumbo data\n");
+    for ( i = 0; i < vmport_used_guestinfo_jumbo; i++ )
+    {
+        if ( vmport_guestsize > 0 )
+        {
+            uint8_t key_len = (uint8_t)(*p++);
+            uint16_t val_len;
+
+            memcpy(&val_len, p, 2);
+            p += 2;
+            if ( key_len )
+            {
+                char key[VMPORT_MAX_KEY_LEN + 1];
+                char val[VMPORT_MAX_VAL_JUMBO_LEN + 1];
+
+                if ( key_len > VMPORT_MAX_KEY_LEN )
+                {
+                    fprintf(stderr,
+                            "*** VMPORT: bogus key_len=%d > %d for 
guestinfo[%d]\n",
+                            key_len, VMPORT_MAX_KEY_LEN, i);
+                    key_len = VMPORT_MAX_KEY_LEN;
+                }
+                memcpy(key, p, key_len);
+                p += key_len;
+                key[key_len] = '\0';
+                if ( val_len > VMPORT_MAX_VAL_JUMBO_LEN )
+                {
+                    fprintf(stderr,
+                            "*** VMPORT: bogus val_len=%d > %d for 
guestinfo[%d]\n",
+                            val_len, VMPORT_MAX_VAL_JUMBO_LEN, i);
+                    val_len = VMPORT_MAX_VAL_JUMBO_LEN;
+                }
+                memcpy(val, p, val_len);
+                p += val_len;
+                val[val_len] = '\0';
+                vmport_guestsize -= 2 + key_len + val_len;
+                printf("    VMPORT: guestinfo_jumbo[%d](%s) = \"%s\"\n",
+                       i, key, val);
+            }
+            else
+            {
+                printf("    VMPORT: bogus len for guestinfo_jumbo[%d]\n", i);
+                vmport_guestsize -= 2;
+            }
+            if ( vmport_guestsize < 0 )
+                printf("    VMPORT: data length skew at guestinfo_jumbo[%d]\n"
+                       "         remaining datasize=%ld\n", i,
+                       vmport_guestsize);
+        }
+    }
+
+    if ( !vmport_guestsize )
+        printf("    VMPORT: %ld bytes leftover data\n", vmport_guestsize);
+}
+
 int main(int argc, char **argv)
 {
     int entry, domid;
@@ -467,6 +686,7 @@ int main(int argc, char **argv)
         case HVM_SAVE_CODE(VIRIDIAN_VCPU): dump_viridian_vcpu(); break;
         case HVM_SAVE_CODE(VMCE_VCPU): dump_vmce_vcpu(); break;
         case HVM_SAVE_CODE(TSC_ADJUST): dump_tsc_adjust(); break;
+        case HVM_SAVE_CODE(VMPORT): dump_vmport(desc.length); break;
         case HVM_SAVE_CODE(END): break;
         default:
             printf(" ** Don't understand type %u: skipping\n",
@@ -477,3 +697,12 @@ int main(int argc, char **argv)
 
     return 0;
 } 
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
-- 
1.8.4


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