On 23.04.2013, at 08:39, Bharat Bhushan wrote: > 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.bhushan@xxxxxxxxxxxxx> > --- > 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); Could you please move the check into kvmppc_mmu_flush_icache()? That way we're guaranteed we can't screw up cache flushes ever :). Also, please add a comment saying why we need this. Alex > > /* Drop refcount on page, so that mmu notifiers can clear it */ > kvm_release_pfn_clean(pfn); > -- > 1.7.0.4 > > -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
