[RFC][PATCH 3/5] tools:libxc: remove mmio BAR out of RMRR mappings

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

We need to avoid allocating MMIO BAR conficting to RMRR range.

Signed-off-by: Tiejun Chen <tiejun.chen@intel.com>
---
 tools/libxc/xc_domain.c        | 25 +++++++++++++++++++++++++
 tools/libxc/xc_hvm_build_x86.c | 26 ++++++++++++++++++++++++++
 tools/libxc/xenctrl.h          |  4 ++++
 3 files changed, 55 insertions(+)

diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c
index 0230c6c..c1dddb1 100644
--- a/tools/libxc/xc_domain.c
+++ b/tools/libxc/xc_domain.c
@@ -648,6 +648,31 @@ int xc_domain_set_memory_map(xc_interface *xch,
 
     return rc;
 }
+
+int xc_get_rmrr_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_RMRR_memory_map, &memmap, sizeof(memmap));
+
+    xc_hypercall_bounce_post(xch, entries);
+
+    return rc ? rc : memmap.nr_entries;
+}
+
 int xc_get_machine_memory_map(xc_interface *xch,
                               struct e820entry entries[],
                               uint32_t max_entries)
diff --git a/tools/libxc/xc_hvm_build_x86.c b/tools/libxc/xc_hvm_build_x86.c
index c81a25b..27d8182 100644
--- a/tools/libxc/xc_hvm_build_x86.c
+++ b/tools/libxc/xc_hvm_build_x86.c
@@ -262,6 +262,8 @@ static int setup_guest(xc_interface *xch,
     int claim_enabled = args->claim_enabled;
     xen_pfn_t special_array[NR_SPECIAL_PAGES];
     xen_pfn_t ioreq_server_array[NR_IOREQ_SERVER_PAGES];
+    struct e820entry map[E820MAX];
+    uint64_t rmrr_end = 0;
 
     if ( nr_pages > target_pages )
         pod_mode = XENMEMF_populate_on_demand;
@@ -300,6 +302,30 @@ static int setup_guest(xc_interface *xch,
         goto error_out;
     }
 
+    /* We need to move mmio range out of RMRR mapping. */
+    rc = xc_get_rmrr_map(xch, map, E820MAX);
+    if (rc < 0)
+    {
+        PERROR("Could not get RMRR info on domain");
+    }
+    else if ( rc )
+    {
+        for ( i = 0; i < rc; i++ )
+        {
+            rmrr_end = map[i].addr + map[i].size + 1;
+            if ( rmrr_end > mmio_start )
+            {
+                mmio_start = rmrr_end;
+            }
+        }
+        mmio_size = (1ull << 32) - mmio_start;
+        if ( mmio_size <= 0 )
+        {
+            PERROR("Could not allocate MMIO memory.");
+            goto error_out;
+        }
+    }
+
     for ( i = 0; i < nr_pages; i++ )
         page_array[i] = i;
     for ( i = mmio_start >> PAGE_SHIFT; i < nr_pages; i++ )
diff --git a/tools/libxc/xenctrl.h b/tools/libxc/xenctrl.h
index 5beb846..14ef42f 100644
--- a/tools/libxc/xenctrl.h
+++ b/tools/libxc/xenctrl.h
@@ -1270,6 +1270,10 @@ int xc_domain_set_memory_map(xc_interface *xch,
 int xc_get_machine_memory_map(xc_interface *xch,
                               struct e820entry entries[],
                               uint32_t max_entries);
+
+int xc_get_rmrr_map(xc_interface *xch,
+                    struct e820entry entries[],
+                    uint32_t max_entries);
 #endif
 int xc_domain_set_time_offset(xc_interface *xch,
                               uint32_t domid,
-- 
1.9.1