From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alexander Graf Date: Fri, 26 Apr 2013 18:29:56 +0000 Subject: [PATCH 01/42] KVM: PPC: cache flush for kernel managed pages Message-Id: <1367001037-10394-23-git-send-email-agraf@suse.de> List-Id: References: <1367001037-10394-1-git-send-email-agraf@suse.de> In-Reply-To: <1367001037-10394-1-git-send-email-agraf@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: kvm-ppc@vger.kernel.org Cc: "kvm@vger.kernel.org mailing list" , Marcelo Tosatti , Gleb Natapov , Bharat Bhushan , Bharat Bhushan From: Bharat Bhushan Kernel can only access pages which maps as memory. So flush only the valid kernel pages. Signed-off-by: Bharat Bhushan Signed-off-by: Alexander Graf --- 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); -- 1.6.0.2