I recently had to debug dom0 taking a fatal page fault and it would have
been useful if it warned when creating a non-present pte if there's no
mfn for a pfn.
Signed-off-by: Ross Lagerwall <ross.lagerw...@citrix.com>
---
arch/x86/xen/mmu.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index adca9e2..4cacc11 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -397,6 +397,7 @@ static pteval_t pte_pfn_to_mfn(pteval_t val)
* pte_mfn_to_pfn is asymmetric.
*/
if (unlikely(mfn == INVALID_P2M_ENTRY)) {
+ printk(KERN_WARNING "No mfn for pfn %lx, creating
non-present pte\n", pfn);
mfn = 0;
flags = 0;
} else
--
2.1.0
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