[PATCH v2] xen/numa: vmap the pages for memnodemap

[Elias El Yandouzi <eliasely@amazon.com>]

From: Hongyan Xia <hongyxia@amazon.com>

This avoids the assumption that there is a direct map and boot pages
fall inside the direct map.

Clean up the variables so that mfn actually stores a type-safe mfn.

Signed-off-by: Hongyan Xia <hongyxia@amazon.com>
Signed-off-by: Julien Grall <jgrall@amazon.com>
Signed-off-by: Elias El Yandouzi <eliasely@amazon.com>

----

    See the discussion in the next patch about using panic().

    Changes in v2:
        * vmap_contig_pages() was renamed to vmap_contig()
        * Replace the BUG_ON() with a panic()

    Changes compare to Hongyan's version:
        * The function modified was moved to common code. So rebase it
        * vmap_boot_pages() was renamed to vmap_contig_pages()

diff --git a/xen/common/numa.c b/xen/common/numa.c
index f454c4d894..ef13ec2255 100644
--- a/xen/common/numa.c
+++ b/xen/common/numa.c
@@ -424,13 +424,14 @@ static int __init populate_memnodemap(const struct node *nodes,
 static int __init allocate_cachealigned_memnodemap(void)
 {
     unsigned long size = PFN_UP(memnodemapsize * sizeof(*memnodemap));
-    unsigned long mfn = mfn_x(alloc_boot_pages(size, 1));
+    mfn_t mfn = alloc_boot_pages(size, 1);
 
-    memnodemap = mfn_to_virt(mfn);
-    mfn <<= PAGE_SHIFT;
+    memnodemap = vmap_contig(mfn, size);
+    if ( !memnodemap )
+        panic("Unable to map the ACPI SLIT. Retry with numa=off");
     size <<= PAGE_SHIFT;
     printk(KERN_DEBUG "NUMA: Allocated memnodemap from %lx - %lx\n",
-           mfn, mfn + size);
+           mfn_to_maddr(mfn), mfn_to_maddr(mfn) + size);
     memnodemapsize = size / sizeof(*memnodemap);
 
     return 0;
-- 
2.40.1