[PATCH v10 11/11] tools/libs/guest: add code to save a v4 libxc stream

[Paul Durrant <paul@xxxxxxx>]

From: Paul Durrant <pdurrant@xxxxxxxxxx>

This patch adds the necessary code to save a REC_TYPE_DOMAIN_CONTEXT record,
and stop saving the now obsolete REC_TYPE_SHARED_INFO and REC_TYPE_TSC_INFO
records for PV guests.

Signed-off-by: Paul Durrant <pdurrant@xxxxxxxxxx>
---
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: Ian Jackson <iwj@xxxxxxxxxxxxxx>
Cc: Wei Liu <wl@xxxxxxx>

v10:
 - New in v10
 - Derived from patch #8 of the v9 series
---
 tools/libs/guest/xg_sr_common_x86.c   | 20 -----------
 tools/libs/guest/xg_sr_common_x86.h   |  6 ----
 tools/libs/guest/xg_sr_save.c         | 52 ++++++++++++++++++++++++++-
 tools/libs/guest/xg_sr_save_x86_hvm.c |  5 ---
 tools/libs/guest/xg_sr_save_x86_pv.c  | 22 ------------
 5 files changed, 51 insertions(+), 54 deletions(-)

diff --git a/tools/libs/guest/xg_sr_common_x86.c 
b/tools/libs/guest/xg_sr_common_x86.c
index 6f12483907..10a35b998e 100644
--- a/tools/libs/guest/xg_sr_common_x86.c
+++ b/tools/libs/guest/xg_sr_common_x86.c
@@ -1,25 +1,5 @@
 #include "xg_sr_common_x86.h"
 
-int write_x86_tsc_info(struct xc_sr_context *ctx)
-{
-    xc_interface *xch = ctx->xch;
-    struct xc_sr_rec_x86_tsc_info tsc = {};
-    struct xc_sr_record rec = {
-        .type = REC_TYPE_X86_TSC_INFO,
-        .length = sizeof(tsc),
-        .data = &tsc,
-    };
-
-    if ( xc_domain_get_tsc_info(xch, ctx->domid, &tsc.mode,
-                                &tsc.nsec, &tsc.khz, &tsc.incarnation) < 0 )
-    {
-        PERROR("Unable to obtain TSC information");
-        return -1;
-    }
-
-    return write_record(ctx, &rec);
-}
-
 int handle_x86_tsc_info(struct xc_sr_context *ctx, struct xc_sr_record *rec)
 {
     xc_interface *xch = ctx->xch;
diff --git a/tools/libs/guest/xg_sr_common_x86.h 
b/tools/libs/guest/xg_sr_common_x86.h
index b55758c96d..e504169705 100644
--- a/tools/libs/guest/xg_sr_common_x86.h
+++ b/tools/libs/guest/xg_sr_common_x86.h
@@ -3,12 +3,6 @@
 
 #include "xg_sr_common.h"
 
-/*
- * Obtains a domains TSC information from Xen and writes a X86_TSC_INFO record
- * into the stream.
- */
-int write_x86_tsc_info(struct xc_sr_context *ctx);
-
 /*
  * Parses a X86_TSC_INFO record and applies the result to the domain.
  */
diff --git a/tools/libs/guest/xg_sr_save.c b/tools/libs/guest/xg_sr_save.c
index 2ba7c3200c..3eecc3e987 100644
--- a/tools/libs/guest/xg_sr_save.c
+++ b/tools/libs/guest/xg_sr_save.c
@@ -13,7 +13,7 @@ static int write_headers(struct xc_sr_context *ctx, uint16_t 
guest_type)
     struct xc_sr_ihdr ihdr = {
         .marker  = IHDR_MARKER,
         .id      = htonl(IHDR_ID),
-        .version = htonl(3),
+        .version = htonl(4),
         .options = htons(IHDR_OPT_LITTLE_ENDIAN),
     };
     struct xc_sr_dhdr dhdr = {
@@ -44,6 +44,52 @@ static int write_headers(struct xc_sr_context *ctx, uint16_t 
guest_type)
     return 0;
 }
 
+/*
+ * Writes a DOMAIN_CONTEXT record into the stream.
+ */
+static int write_domain_context_record(struct xc_sr_context *ctx)
+{
+    xc_interface *xch = ctx->xch;
+    struct xc_sr_record rec = {
+        .type = REC_TYPE_DOMAIN_CONTEXT,
+    };
+    size_t len = 0;
+    int rc;
+
+    rc = xc_domain_get_context(xch, ctx->domid, NULL, &len);
+    if ( rc < 0 )
+    {
+        PERROR("can't get record length for dom %u\n", ctx->domid);
+        goto out;
+    }
+
+    rec.data = malloc(len);
+
+    rc = -1;
+    if ( !rec.data )
+    {
+        PERROR("can't allocate %lu bytes\n", len);
+        goto out;
+    }
+
+    rc = xc_domain_get_context(xch, ctx->domid, rec.data, &len);
+    if ( rc < 0 )
+    {
+        PERROR("can't get domain record for dom %u\n", ctx->domid);
+        goto out;
+    }
+
+    rec.length = len;
+    rc = write_record(ctx, &rec);
+    if ( rc < 0 )
+        PERROR("failed to write DOMAIN_CONTEXT record");
+
+ out:
+    free(rec.data);
+
+    return rc;
+}
+
 /*
  * Writes an END record into the stream.
  */
@@ -905,6 +951,10 @@ static int save(struct xc_sr_context *ctx, uint16_t 
guest_type)
             goto err;
         }
 
+        rc = write_domain_context_record(ctx);
+        if ( rc )
+            goto err;
+
         rc = ctx->save.ops.end_of_checkpoint(ctx);
         if ( rc )
             goto err;
diff --git a/tools/libs/guest/xg_sr_save_x86_hvm.c 
b/tools/libs/guest/xg_sr_save_x86_hvm.c
index 1634a7bc43..d44fb3fc4f 100644
--- a/tools/libs/guest/xg_sr_save_x86_hvm.c
+++ b/tools/libs/guest/xg_sr_save_x86_hvm.c
@@ -193,11 +193,6 @@ static int x86_hvm_end_of_checkpoint(struct xc_sr_context 
*ctx)
 {
     int rc;
 
-    /* Write the TSC record. */
-    rc = write_x86_tsc_info(ctx);
-    if ( rc )
-        return rc;
-
     /* Write the HVM_CONTEXT record. */
     rc = write_hvm_context(ctx);
     if ( rc )
diff --git a/tools/libs/guest/xg_sr_save_x86_pv.c 
b/tools/libs/guest/xg_sr_save_x86_pv.c
index 4964f1f7b8..3de7b19f54 100644
--- a/tools/libs/guest/xg_sr_save_x86_pv.c
+++ b/tools/libs/guest/xg_sr_save_x86_pv.c
@@ -849,20 +849,6 @@ static int write_x86_pv_p2m_frames(struct xc_sr_context 
*ctx)
     return rc;
 }
 
-/*
- * Writes an SHARED_INFO record into the stream.
- */
-static int write_shared_info(struct xc_sr_context *ctx)
-{
-    struct xc_sr_record rec = {
-        .type = REC_TYPE_SHARED_INFO,
-        .length = PAGE_SIZE,
-        .data = ctx->x86.pv.shinfo,
-    };
-
-    return write_record(ctx, &rec);
-}
-
 /*
  * Normalise a pagetable for the migration stream.  Performs mfn->pfn
  * conversions on the ptes.
@@ -1093,14 +1079,6 @@ static int x86_pv_end_of_checkpoint(struct xc_sr_context 
*ctx)
 {
     int rc;
 
-    rc = write_x86_tsc_info(ctx);
-    if ( rc )
-        return rc;
-
-    rc = write_shared_info(ctx);
-    if ( rc )
-        return rc;
-
     rc = write_all_vcpu_information(ctx);
     if ( rc )
         return rc;
-- 
2.20.1