[RFC][v3][PATCH 5/6] tools:libxc: check if mmio BAR is 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        | 26 ++++++++++++++++++++++++++
 tools/libxc/xc_hvm_build_x86.c | 23 +++++++++++++++++++++++
 tools/libxc/xenctrl.h          |  4 ++++
 3 files changed, 53 insertions(+)

diff --git a/tools/libxc/xc_domain.c b/tools/libxc/xc_domain.c
index c67ac9a..8d011ef 100644
--- a/tools/libxc/xc_domain.c
+++ b/tools/libxc/xc_domain.c
@@ -649,6 +649,32 @@ 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_reserved_device_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..2196cdb 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_start = 0, rmrr_end = 0;
 
     if ( nr_pages > target_pages )
         pod_mode = XENMEMF_populate_on_demand;
@@ -300,6 +302,27 @@ static int setup_guest(xc_interface *xch,
         goto error_out;
     }
 
+    /* We should check if mmio range is 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_start = map[i].addr;
+            rmrr_end = map[i].addr + map[i].size + 1;
+            if ( check_mmio_hole(rmrr_start, map[i].size + 1, mmio_start, mmio_size) )
+            {
+                PERROR("MMIO: [%lx]<->[%lx] overlap RMRR [%lx]<->[%lx]\n",
+                       mmio_start, (mmio_start + mmio_size), rmrr_start, rmrr_end);
+                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 1c5d0db..6d3b135 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