From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from e23smtp09.au.ibm.com (e23smtp09.au.ibm.com [202.81.31.142]) (using TLSv1.2 with cipher CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 1846D1A0B54 for ; Tue, 1 Mar 2016 17:55:52 +1100 (AEDT) Received: from localhost by e23smtp09.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 1 Mar 2016 16:55:50 +1000 Received: from d23relay06.au.ibm.com (d23relay06.au.ibm.com [9.185.63.219]) by d23dlp03.au.ibm.com (Postfix) with ESMTP id 935753578052 for ; Tue, 1 Mar 2016 17:55:44 +1100 (EST) Received: from d23av04.au.ibm.com (d23av04.au.ibm.com [9.190.235.139]) by d23relay06.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u216tVuM41746486 for ; Tue, 1 Mar 2016 17:55:44 +1100 Received: from d23av04.au.ibm.com (localhost [127.0.0.1]) by d23av04.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u216t6Cw015762 for ; Tue, 1 Mar 2016 17:55:07 +1100 From: Alexey Kardashevskiy To: kvm-ppc@vger.kernel.org Cc: Alexey Kardashevskiy , Paul Mackerras , David Gibson , linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org Subject: [PATCH kernel v2 3/4] KVM: PPC: Add @offset to kvmppc_spapr_tce_table Date: Tue, 1 Mar 2016 17:54:39 +1100 Message-Id: <1456815280-38546-4-git-send-email-aik@ozlabs.ru> In-Reply-To: <1456815280-38546-1-git-send-email-aik@ozlabs.ru> References: <1456815280-38546-1-git-send-email-aik@ozlabs.ru> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , This enables userspace view of TCE tables to start from non-zero offset on a bus. This will be used for huge DMA windows. This only changes the internal structure, the user interface needs to change in order to use an offset. Signed-off-by: Alexey Kardashevskiy Reviewed-by: David Gibson --- arch/powerpc/include/asm/kvm_host.h | 1 + arch/powerpc/kvm/book3s_64_vio_hv.c | 7 +++++-- 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h index edf66f7..2e7c791 100644 --- a/arch/powerpc/include/asm/kvm_host.h +++ b/arch/powerpc/include/asm/kvm_host.h @@ -184,6 +184,7 @@ struct kvmppc_spapr_tce_table { u64 liobn; struct rcu_head rcu; u32 page_shift; + u64 offset; /* in pages */ u64 size; /* window size in pages */ struct page *pages[0]; }; diff --git a/arch/powerpc/kvm/book3s_64_vio_hv.c b/arch/powerpc/kvm/book3s_64_vio_hv.c index c786a58..44be73e 100644 --- a/arch/powerpc/kvm/book3s_64_vio_hv.c +++ b/arch/powerpc/kvm/book3s_64_vio_hv.c @@ -75,7 +75,9 @@ long kvmppc_ioba_validate(struct kvmppc_spapr_tce_table *stt, unsigned long mask = (1ULL << stt->page_shift) - 1; unsigned long idx = ioba >> stt->page_shift; - if ((ioba & mask) || (idx + npages > stt->size) || (idx + npages < idx)) + if ((ioba & mask) || (idx < stt->offset) || + (idx - stt->offset + npages > stt->size) || + (idx + npages < idx)) return H_PARAMETER; return H_SUCCESS; @@ -147,6 +149,7 @@ void kvmppc_tce_put(struct kvmppc_spapr_tce_table *stt, struct page *page; u64 *tbl; + idx -= stt->offset; page = stt->pages[idx / TCES_PER_PAGE]; tbl = kvmppc_page_address(page); @@ -335,7 +338,7 @@ long kvmppc_h_get_tce(struct kvm_vcpu *vcpu, unsigned long liobn, if (ret != H_SUCCESS) return ret; - idx = ioba >> stt->page_shift; + idx = (ioba >> stt->page_shift) - stt->offset; page = stt->pages[idx / TCES_PER_PAGE]; tbl = (u64 *)page_address(page); -- 2.5.0.rc3