diff options
authorStefan Bader <>2011-01-20 15:38:23 +0100
committerKonrad Rzeszutek Wilk <>2011-01-21 11:24:14 -0500
commit8e1b4cf2108488ccfb9a3e7ed7cd85a435e01d4b (patch)
parent7d81c3b9e2e5057c52256e154205143ad4e6e919 (diff)
xen: p2m: correctly initialize partial p2m leaf
After changing the p2m mapping to a tree by commit 58e05027b530ff081ecea68e38de8d59db8f87e0 xen: convert p2m to a 3 level tree and trying to boot a DomU with 615MB of memory, the following crash was observed in the dump: kernel direct mapping tables up to 26f00000 @ 1ec4000-1fff000 BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<c0107397>] xen_set_pte+0x27/0x60 *pdpt = 0000000000000000 *pde = 0000000000000000 Adding further debug statements showed that when trying to set up pfn=0x26700 the returned mapping was invalid. pfn=0x266ff calling set_pte(0xc1fe77f8, 0x6b3003) pfn=0x26700 calling set_pte(0xc1fe7800, 0x3) Although the last_pfn obtained from the startup info is 0x26700, which should in turn not be hit, the additional 8MB which are added as extra memory normally seem to be ok. This lead to looking into the initial p2m tree construction, which uses the smaller value and assuming that there is other code handling the extra memory. When the p2m tree is set up, the leaves are directly pointed to the array which the domain builder set up. But if the mapping is not on a boundary that fits into one p2m page, this will result in the last leaf being only partially valid. And as the invalid entries are not initialized in that case, things go badly wrong. I am trying to fix that by checking whether the current leaf is a complete map and if not, allocate a completely new page and copy only the valid pointers there. This may not be the most efficient or elegant solution, but at least it seems to allow me booting DomUs with memory assignments all over the range. BugLink: [v2: Redid a bit of commit wording and fixed a compile warning] Signed-off-by: Stefan Bader <> Signed-off-by: Konrad Rzeszutek Wilk <>
1 files changed, 19 insertions, 1 deletions
diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
index 8f2251d2a3f8..ddc81a06edb9 100644
--- a/arch/x86/xen/p2m.c
+++ b/arch/x86/xen/p2m.c
@@ -237,7 +237,25 @@ void __init xen_build_dynamic_phys_to_machine(void)
p2m_top[topidx] = mid;
- p2m_top[topidx][mididx] = &mfn_list[pfn];
+ /*
+ * As long as the mfn_list has enough entries to completely
+ * fill a p2m page, pointing into the array is ok. But if
+ * not the entries beyond the last pfn will be undefined.
+ * And guessing that the 'what-ever-there-is' does not take it
+ * too kindly when changing it to invalid markers, a new page
+ * is allocated, initialized and filled with the valid part.
+ */
+ if (unlikely(pfn + P2M_PER_PAGE > max_pfn)) {
+ unsigned long p2midx;
+ unsigned long *p2m = extend_brk(PAGE_SIZE, PAGE_SIZE);
+ p2m_init(p2m);
+ for (p2midx = 0; pfn + p2midx < max_pfn; p2midx++) {
+ p2m[p2midx] = mfn_list[pfn + p2midx];
+ }
+ p2m_top[topidx][mididx] = p2m;
+ } else
+ p2m_top[topidx][mididx] = &mfn_list[pfn];