Kernel should only try flushing pages which are managed by kernel.
pfn_to_page will returns junk struct page for pages not managed by kernel,
so if kernel will try to flush direct mapped memory or direct assigned device
mapping then it will work on junk struct page.
Signed-off-by: Bharat Bhushan <bharat.bhus...@freescale.com>
---
arch/powerpc/kvm/e500_mmu_host.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/arch/powerpc/kvm/e500_mmu_host.c b/arch/powerpc/kvm/e500_mmu_host.c
index 1c6a9d7..e07da21 100644
--- a/arch/powerpc/kvm/e500_mmu_host.c
+++ b/arch/powerpc/kvm/e500_mmu_host.c
@@ -455,7 +455,8 @@ static inline int kvmppc_e500_shadow_map(struct
kvmppc_vcpu_e500 *vcpu_e500,
ref, gvaddr, stlbe);
/* Clear i-cache for new pages */
- kvmppc_mmu_flush_icache(pfn);
+ if (pfn_valid(pfn))
+ kvmppc_mmu_flush_icache(pfn);
/* Drop refcount on page, so that mmu notifiers can clear it */
kvm_release_pfn_clean(pfn);
--
1.7.0.4
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