Better error reporting when failed to map vram

The error message was rather brief.

Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>

diff --git a/hw/vga.c b/hw/vga.c
index 65c710a153f31092b9a7bd69c9f2f938c6b75c6a..9ca92786f475eeebe08741388c3dd5a85587842b 100644 (file)
--- a/hw/vga.c
+++ b/hw/vga.c
@@ -2074,7 +2074,8 @@ void xen_vga_vram_map(uint64_t vram_addr, int copy)
                                         pfn_list, nr_pfn);
 
     if (!vram) {
-        fprintf(stderr, "Failed to map vram\n");
+        fprintf(stderr, "Failed to map vram nr_pfn=%lu vram_addr=%lx: %s\n",
+                nr_pfn, (unsigned long)vram_addr, strerror(errno));
         exit(1);
     }