From: Bharat Bhushan <Bharat.Bhushan@xxxxxxxxxxxxx>
Kernel can only access pages which maps as memory.
So flush only the valid kernel pages.
Signed-off-by: Bharat Bhushan <bharat.bhushan@xxxxxxxxxxxxx>
---
v1->v2
- move pfn_valid() check in kvmppc_mmu_flush_icache
- Added comment to describe why this is needed
arch/powerpc/include/asm/kvm_ppc.h | 9 ++++++++-
1 files changed, 8 insertions(+), 1 deletions(-)
diff --git a/arch/powerpc/include/asm/kvm_ppc.h b/arch/powerpc/include/asm/kvm_ppc.h
index f589307..4794de6 100644
--- a/arch/powerpc/include/asm/kvm_ppc.h
+++ b/arch/powerpc/include/asm/kvm_ppc.h
@@ -282,8 +282,15 @@ void kvmppc_init_lpid(unsigned long nr_lpids);
static inline void kvmppc_mmu_flush_icache(pfn_t pfn)
{
- /* Clear i-cache for new pages */
struct page *page;
+ /*
+ * We can only access pages that the kernel maps
+ * as memory. Bail out for unmapped ones.
+ */
+ if (!pfn_valid(pfn))
+ return;
+
+ /* Clear i-cache for new pages */
page = pfn_to_page(pfn);
if (!test_bit(PG_arch_1, &page->flags)) {
flush_dcache_icache_page(page);
--
1.7.0.4
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