[RFC][PATCH 10/13] tools: extend XENMEM_set_memory_map

[Tiejun Chen <tiejun.chen@intel.com>]

Here we'll construct a basic guest e820 table via
XENMEM_set_memory_map. This table includes lowmem, highmem
and RDMs if they exist. And hvmloader would need this info
later.

Signed-off-by: Tiejun Chen <tiejun.chen@intel.com>
---
 tools/libxl/libxl_dom.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)

diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
index ee67282..82468be 100644
--- a/tools/libxl/libxl_dom.c
+++ b/tools/libxl/libxl_dom.c
@@ -787,6 +787,70 @@ out:
     return rc;
 }
 
+static int libxl__domain_construct_memmap(libxl_ctx *ctx,
+                                          libxl_domain_config *d_config,
+                                          uint32_t domid,
+                                          struct xc_hvm_build_args *args,
+                                          int num_pcidevs,
+                                          libxl_device_pci *pcidevs)
+{
+    unsigned int nr = 0, i;
+    /* We always own at least one lowmem entry. */
+    unsigned int e820_entries = 1;
+    uint64_t highmem_end = 0, highmem_size = args->mem_size - args->lowmem_size;
+    struct e820entry *e820 = NULL;
+
+    /* Add all rdm entries. */
+    e820_entries += d_config->num_rdms;
+
+    /* If we should have a highmem range. */
+    if (highmem_size)
+    {
+        highmem_end = (1ull<<32) + highmem_size;
+        e820_entries++;
+    }
+
+    e820 = malloc(sizeof(struct e820entry) * e820_entries);
+    if (!e820) {
+        return -1;
+    }
+
+    /* Low memory */
+    e820[nr].addr = 0x100000;
+    e820[nr].size = args->lowmem_size - 0x100000;
+    e820[nr].type = E820_RAM;
+    nr++;
+
+    /* RDM mapping */
+    for (i = 0; i < d_config->num_rdms; i++) {
+        /*
+         * We should drop this kind of rdm entry.
+         */
+        if (d_config->rdms[i].flag == LIBXL_RDM_RESERVE_FLAG_INVALID)
+            continue;
+
+        e820[nr].addr = d_config->rdms[i].start;
+        e820[nr].size = d_config->rdms[i].size;
+        e820[nr].type = E820_RESERVED;
+        nr++;
+    }
+
+    /* High memory */
+    if (highmem_size) {
+        e820[nr].addr = ((uint64_t)1 << 32);
+        e820[nr].size = highmem_size;
+        e820[nr].type = E820_RAM;
+    }
+
+    if (xc_domain_set_memory_map(ctx->xch, domid, e820, e820_entries) != 0) {
+        free(e820);
+        return -1;
+    }
+
+    free(e820);
+    return 0;
+}
+
 int libxl__build_hvm(libxl__gc *gc, uint32_t domid,
               libxl_domain_config *d_config,
               libxl__domain_build_state *state)
@@ -836,6 +900,14 @@ int libxl__build_hvm(libxl__gc *gc, uint32_t domid,
         goto out;
     }
 
+    if (libxl__domain_construct_memmap(ctx, d_config, domid,
+                                       &args,
+                                       d_config->num_pcidevs,
+                                       d_config->pcidevs)) {
+        LOG(ERROR, "setting domain rdm memory map failed");
+        goto out;
+    }
+
     if (libxl__domain_firmware(gc, info, &args)) {
         LOG(ERROR, "initializing domain firmware failed");
         goto out;
-- 
1.9.1