[PATCH v2] KVM: PPC: cache flush for kernel managed pages

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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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