[PATCH 1 of 4] tools: Add xc_domain_set_memory_map and xc_get_machine_memory_map calls (x86, amd64 only)

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

# HG changeset patch
# User Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
# Date 1302557409 14400
# Node ID 8190b1eb9a8cfe63ee0aecc35416c4e8300c45f4
# Parent  4e7016852f35b44af6d5f82737ceb47015ef00a6
tools: Add xc_domain_set_memory_map and xc_get_machine_memory_map calls (x86,amd64 only).

The later retrieves the E820 as seen by the hypervisor (completely
unchanged) and the second call sets the E820 for the specified guest.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff -r 4e7016852f35 -r 8190b1eb9a8c tools/libxc/xc_domain.c
--- a/tools/libxc/xc_domain.c	Mon Apr 11 17:25:15 2011 -0400
+++ b/tools/libxc/xc_domain.c	Mon Apr 11 17:30:09 2011 -0400
@@ -478,37 +478,64 @@ int xc_domain_pin_memory_cacheattr(xc_in
 }
 
 #if defined(__i386__) || defined(__x86_64__)
-#include "xc_e820.h"
+int xc_domain_set_memory_map(xc_interface *xch,
+                               uint32_t domid,
+                               struct e820entry entries[],
+                               uint32_t nr_entries)
+{
+    int rc;
+    struct xen_foreign_memory_map fmap = {
+        .domid = domid,
+        .map = { .nr_entries = nr_entries }
+    };
+    DECLARE_HYPERCALL_BOUNCE(entries, nr_entries * sizeof(struct e820entry),
+                             XC_HYPERCALL_BUFFER_BOUNCE_IN);
+
+    if ( !entries || xc_hypercall_bounce_pre(xch, entries) )
+        return -1;
+
+    set_xen_guest_handle(fmap.map.buffer, entries);
+
+    rc = do_memory_op(xch, XENMEM_set_memory_map, &fmap, sizeof(fmap));
+
+    xc_hypercall_bounce_post(xch, entries);
+
+    return rc;
+}
+int xc_get_machine_memory_map(xc_interface *xch,
+                              struct e820entry entries[],
+                              uint32_t max_entries)
+{
+    int rc;
+    struct xen_memory_map memmap = {
+        .nr_entries = max_entries
+    };
+    DECLARE_HYPERCALL_BOUNCE(entries, sizeof(struct e820entry) * max_entries,
+                             XC_HYPERCALL_BUFFER_BOUNCE_OUT);
+
+    if ( !entries || xc_hypercall_bounce_pre(xch, entries) || max_entries <= 1)
+        return -1;
+
+
+    set_xen_guest_handle(memmap.buffer, entries);
+
+    rc = do_memory_op(xch, XENMEM_machine_memory_map, &memmap, sizeof(memmap));
+
+    xc_hypercall_bounce_post(xch, entries);
+
+    return rc ? rc : memmap.nr_entries;
+}
 int xc_domain_set_memmap_limit(xc_interface *xch,
                                uint32_t domid,
                                unsigned long map_limitkb)
 {
-    int rc;
-    struct xen_foreign_memory_map fmap = {
-        .domid = domid,
-        .map = { .nr_entries = 1 }
-    };
-    DECLARE_HYPERCALL_BUFFER(struct e820entry, e820);
+    struct e820entry e820;
 
-    e820 = xc_hypercall_buffer_alloc(xch, e820, sizeof(*e820));
+    e820.addr = 0;
+    e820.size = (uint64_t)map_limitkb << 10;
+    e820.type = E820_RAM;
 
-    if ( e820 == NULL )
-    {
-        PERROR("Could not allocate memory for xc_domain_set_memmap_limit hypercall");
-        return -1;
-    }
-
-    e820->addr = 0;
-    e820->size = (uint64_t)map_limitkb << 10;
-    e820->type = E820_RAM;
-
-    set_xen_guest_handle(fmap.map.buffer, e820);
-
-    rc = do_memory_op(xch, XENMEM_set_memory_map, &fmap, sizeof(fmap));
-
-    xc_hypercall_buffer_free(xch, e820);
-
-    return rc;
+    return xc_domain_set_memory_map(xch, domid, &e820, 1);
 }
 #else
 int xc_domain_set_memmap_limit(xc_interface *xch,
diff -r 4e7016852f35 -r 8190b1eb9a8c tools/libxc/xc_e820.h
--- a/tools/libxc/xc_e820.h	Mon Apr 11 17:25:15 2011 -0400
+++ b/tools/libxc/xc_e820.h	Mon Apr 11 17:30:09 2011 -0400
@@ -26,6 +26,7 @@
 #define E820_RESERVED     2
 #define E820_ACPI         3
 #define E820_NVS          4
+#define E820_UNUSABLE     5
 
 struct e820entry {
     uint64_t addr;
diff -r 4e7016852f35 -r 8190b1eb9a8c tools/libxc/xenctrl.h
--- a/tools/libxc/xenctrl.h	Mon Apr 11 17:25:15 2011 -0400
+++ b/tools/libxc/xenctrl.h	Mon Apr 11 17:30:09 2011 -0400
@@ -966,6 +966,17 @@ int xc_domain_set_memmap_limit(xc_interf
                                uint32_t domid,
                                unsigned long map_limitkb);
 
+#if defined(__i386__) || defined(__x86_64__)
+#include "xc_e820.h"
+int xc_domain_set_memory_map(xc_interface *xch,
+                               uint32_t domid,
+                               struct e820entry entries[],
+                               uint32_t nr_entries);
+
+int xc_get_machine_memory_map(xc_interface *xch,
+                              struct e820entry entries[],
+                              uint32_t max_entries);
+#endif
 int xc_domain_set_time_offset(xc_interface *xch,
                               uint32_t domid,
                               int32_t time_offset_seconds);