On 25.04.2013, at 18:33, Bharat Bhushan wrote:
> From: Bharat Bhushan <[email protected]>
>
> Kernel can only access pages which maps as memory.
> So flush only the valid kernel pages.
>
> Signed-off-by: Bharat Bhushan <[email protected]>
Thanks, applied to kvm-ppc-queue.
Alex
> ---
> 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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