From 8461f54ec5cfa40e84ac1e9d82544c99a6088778 Mon Sep 17 00:00:00 2001
From: Jean Guyader <jean.guyader@eu.citrix.com>
Date: Tue, 17 Feb 2009 15:44:26 +0000
Subject: [PATCH] Do a 1:1 map of the host's ACPI_NVS region when we build a
 hvm guest.

---
 tools/libxc/xc_hvm_build.c |  9 ++++-----
 tools/libxc/xc_linux.c     | 37 ++++++++++++++++++++++++++++++++++++-
 tools/libxc/xc_private.h   |  5 +++++
 3 files changed, 45 insertions(+), 6 deletions(-)

diff --git a/tools/libxc/xc_hvm_build.c b/tools/libxc/xc_hvm_build.c
index 3454619..1253de0 100644
--- a/tools/libxc/xc_hvm_build.c
+++ b/tools/libxc/xc_hvm_build.c
@@ -30,7 +30,8 @@
 #define SPECIALPAGE_IDENT_PT 4
 #define NR_SPECIAL_PAGES     5
 
-static void build_e820map(void *e820_page, unsigned long long mem_size)
+static void build_e820map(void *e820_page, unsigned long long mem_size,
+			  uint32_t domid, int xc_handle)
 {
     struct e820entry *e820entry =
         (struct e820entry *)(((unsigned char *)e820_page) + HVM_E820_OFFSET);
@@ -86,9 +87,7 @@ static void build_e820map(void *e820_page, unsigned long long mem_size)
     e820entry[nr_map].type = E820_RESERVED;
     nr_map++;
 
-    e820entry[nr_map].addr = 0x7D5AE000;
-    e820entry[nr_map].size = 0x2000;
-    e820entry[nr_map].type = E820_NVS;
+    xc_add_acpi_nvs(xc_handle, domid, &e820entry[nr_map]);
     nr_map++;
 
 
@@ -324,7 +323,7 @@ static int setup_guest(int xc_handle,
               HVM_E820_PAGE >> PAGE_SHIFT)) == NULL )
         goto error_out;
     memset(e820_page, 0, PAGE_SIZE);
-    build_e820map(e820_page, v_end);
+    build_e820map(e820_page, v_end, dom, xc_handle);
     munmap(e820_page, PAGE_SIZE);
 
     /* Map and initialise shared_info page. */
diff --git a/tools/libxc/xc_linux.c b/tools/libxc/xc_linux.c
index 0c70e99..21959d0 100644
--- a/tools/libxc/xc_linux.c
+++ b/tools/libxc/xc_linux.c
@@ -611,7 +611,42 @@ int xc_get_vgabios(unsigned char        *buf,
 out:
     close(mem);
     return size;
-} 
+}
+
+int xc_add_acpi_nvs(int			xc_handle,
+		    uint32_t		domid,
+		    struct e820entry	*entry)
+{
+    FILE	*fd;
+    char	line[256];
+    char	*s;
+    uint64_t	begin_addr, end_addr, size;
+
+
+    if ((fd = fopen("/proc/iomem", "r")))
+	return 0;
+
+    while ((fgets(line, 256, fd)))
+	if (strstr(line, "ACPI Non-volatile Storage"))
+	{
+	    begin_addr = strtol(line, &s, 16);
+	    end_addr = strtol(s + 1, NULL, 16);
+	    size = end_addr - begin_addr + 1;
+	    entry->addr = begin_addr;
+	    entry->size = size;
+	    entry->type = E820_NVS;
+
+	    xc_domain_memory_mapping(xc_handle, domid,
+				     begin_addr >> XC_PAGE_SHIFT,
+				     begin_addr >> XC_PAGE_SHIFT,
+				     size >> XC_PAGE_SHIFT,
+				     1);
+	    fclose(fd);
+	    return 1;
+	}
+    fclose(fd);
+    return 0;
+}
 
 
 /*
diff --git a/tools/libxc/xc_private.h b/tools/libxc/xc_private.h
index 6e49b74..1e140a7 100644
--- a/tools/libxc/xc_private.h
+++ b/tools/libxc/xc_private.h
@@ -14,6 +14,7 @@
 #include <sys/ioctl.h>
 
 #include "xenctrl.h"
+#include "xc_e820.h"
 
 #include <xen/sys/privcmd.h>
 
@@ -215,4 +216,8 @@ int xc_flush_mmu_updates(int xc_handle, struct xc_mmu *mmu);
 int read_exact(int fd, void *data, size_t size);
 int write_exact(int fd, const void *data, size_t size);
 
+int xc_add_acpi_nvs(int			xc_handle,
+		    uint32_t		domid,
+		    struct e820entry	*entry);
+
 #endif /* __XC_PRIVATE_H__ */
-- 
2.39.5