This is because the P2M table, when placed at a kernel specified
location, gets populated with large pages, which the domain must have
a way to unmap/recycle.
Additionally when allowing Dom0 to use superpages, they ought to be
tracked accordingly in the superpage frame table.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
--- 2010-06-15.orig/xen/arch/x86/domain_build.c 2010-06-15 12:22:11.000000000
+0200
+++ 2010-06-15/xen/arch/x86/domain_build.c 2010-06-15 11:30:19.000000000
+0200
@@ -913,6 +913,8 @@ int __init construct_dom0(
{
*l2tab = l2e_from_page(page,
L1_PROT|_PAGE_DIRTY|_PAGE_PSE);
+ if ( opt_allow_superpage )
+ get_superpage(page_to_mfn(page), d);
va += 1UL << L2_PAGETABLE_SHIFT;
continue;
}
--- 2010-06-15.orig/xen/arch/x86/mm.c 2010-06-15 12:22:11.000000000 +0200
+++ 2010-06-15/xen/arch/x86/mm.c 2010-06-15 11:31:24.000000000 +0200
@@ -154,7 +154,9 @@ unsigned long __read_mostly pdx_group_va
int opt_allow_superpage;
boolean_param("allowsuperpage", opt_allow_superpage);
+#ifdef __i386__
static int get_superpage(unsigned long mfn, struct domain *d);
+#endif
static void put_superpage(unsigned long mfn);
#define l1_disallow_mask(d) \
@@ -2567,7 +2569,7 @@ void clear_superpage_mark(struct page_in
}
-static int get_superpage(unsigned long mfn, struct domain *d)
+int get_superpage(unsigned long mfn, struct domain *d)
{
struct spage_info *spage;
unsigned long x, nx, y;
@@ -2610,7 +2612,11 @@ static void put_superpage(unsigned long
unsigned long x, nx, y;
unsigned long do_pages = 0;
- ASSERT(opt_allow_superpage);
+ if ( !opt_allow_superpage )
+ {
+ put_spage_pages(mfn_to_page(mfn));
+ return;
+ }
spage = mfn_to_spage(mfn);
y = spage->type_info;
--- 2010-06-15.orig/xen/include/asm-x86/mm.h 2010-06-15 12:22:11.000000000
+0200
+++ 2010-06-15/xen/include/asm-x86/mm.h 2010-06-15 11:28:58.000000000 +0200
@@ -281,6 +281,7 @@ extern void share_xen_page_with_privileg
#define frame_table ((struct page_info *)FRAMETABLE_VIRT_START)
#ifdef __x86_64__
#define spage_table ((struct spage_info *)SPAGETABLE_VIRT_START)
+int get_superpage(unsigned long mfn, struct domain *d);
#endif
extern unsigned long max_page;
extern unsigned long total_pages;
x86-put-superpage.patch
Description: Text document
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