[Xen-devel] [v8][PATCH 07/17] hvmloader/util: get reserved device memory maps

[Tiejun Chen <tiejun.chen@xxxxxxxxx>]

We need to use reserved device memory maps with multiple times, so
provide just one common function should be friend.

Signed-off-by: Tiejun Chen <tiejun.chen@xxxxxxxxx>
---
 tools/firmware/hvmloader/util.c | 59 +++++++++++++++++++++++++++++++++++++++++
 tools/firmware/hvmloader/util.h |  2 ++
 2 files changed, 61 insertions(+)

diff --git a/tools/firmware/hvmloader/util.c b/tools/firmware/hvmloader/util.c
index 80d822f..dd81fb6 100644
--- a/tools/firmware/hvmloader/util.c
+++ b/tools/firmware/hvmloader/util.c
@@ -22,11 +22,14 @@
 #include "config.h"
 #include "hypercall.h"
 #include "ctype.h"
+#include "errno.h"
 #include <stdint.h>
 #include <xen/xen.h>
 #include <xen/memory.h>
 #include <xen/sched.h>
 
+struct xen_reserved_device_memory *rdm_map;
+
 void wrmsr(uint32_t idx, uint64_t v)
 {
     asm volatile (
@@ -828,6 +831,62 @@ int hpet_exists(unsigned long hpet_base)
     return ((hpet_id >> 16) == 0x8086);
 }
 
+static int
+get_reserved_device_memory_map(struct xen_reserved_device_memory entries[],
+                               uint32_t *max_entries)
+{
+    int rc;
+    struct xen_reserved_device_memory_map xrdmmap = {
+        .domid = DOMID_SELF,
+        .nr_entries = *max_entries
+    };
+
+    set_xen_guest_handle(xrdmmap.buffer, entries);
+
+    rc = hypercall_memory_op(XENMEM_reserved_device_memory_map, &xrdmmap);
+    *max_entries = xrdmmap.nr_entries;
+
+    return rc;
+}
+
+/*
+ * Getting all reserved device memory map info in case of hvmloader.
+ * We just return zero for any failed cases, and this means we
+ * can't further handle any reserved device memory.
+ */
+unsigned int hvm_get_reserved_device_memory_map(void)
+{
+    static unsigned int nr_entries = 0;
+    int rc = get_reserved_device_memory_map(rdm_map, &nr_entries);
+
+    if ( rc == -ENOBUFS )
+    {
+        rdm_map = mem_alloc(nr_entries*sizeof(struct 
xen_reserved_device_memory),
+                            0);
+        if ( rdm_map )
+        {
+            rc = get_reserved_device_memory_map(rdm_map, &nr_entries);
+            if ( rc )
+            {
+                printf("Could not get reserved dev memory info on domain");
+                return 0;
+            }
+        }
+        else
+        {
+            printf("No space to get reserved dev memory maps!\n");
+            return 0;
+        }
+    }
+    else if ( rc )
+    {
+        printf("Could not get reserved dev memory info on domain");
+        return 0;
+    }
+
+    return nr_entries;
+}
+
 /*
  * Local variables:
  * mode: C
diff --git a/tools/firmware/hvmloader/util.h b/tools/firmware/hvmloader/util.h
index a70e4aa..e4f1851 100644
--- a/tools/firmware/hvmloader/util.h
+++ b/tools/firmware/hvmloader/util.h
@@ -241,6 +241,8 @@ int build_e820_table(struct e820entry *e820,
                      unsigned int bios_image_base);
 void dump_e820_table(struct e820entry *e820, unsigned int nr);
 
+unsigned int hvm_get_reserved_device_memory_map(void);
+
 #ifndef NDEBUG
 void perform_tests(void);
 #else
-- 
1.9.1


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