From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:39499) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Yo4eA-0008NM-9N for qemu-devel@nongnu.org; Fri, 01 May 2015 02:42:06 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Yo4e7-0001JN-42 for qemu-devel@nongnu.org; Fri, 01 May 2015 02:42:02 -0400 From: David Gibson Date: Fri, 1 May 2015 16:41:20 +1000 Message-Id: <1430462510-14195-3-git-send-email-david@gibson.dropbear.id.au> In-Reply-To: <1430462510-14195-1-git-send-email-david@gibson.dropbear.id.au> References: <1430462510-14195-1-git-send-email-david@gibson.dropbear.id.au> Subject: [Qemu-devel] [PATCH 02/32] spapr_iommu: Disable in-kernel IOMMU tables for >4GB windows List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: agraf@suse.de Cc: Alexey Kardashevskiy , qemu-devel@nongnu.org, mdroth@linux.vnet.ibm.com, qemu-ppc@nongnu.org, afaerber@suse.de, David Gibson From: Alexey Kardashevskiy The existing KVM_CREATE_SPAPR_TCE ioctl only support 4G windows max as the window size parameter to the kernel ioctl() is 32-bit so there's no way of expressing a TCE window > 4GB. We are going to add huge DMA windows support so this will create small window and unexpectedly fail later. This disables KVM_CREATE_SPAPR_TCE for windows bigger that 4GB. Signed-off-by: Alexey Kardashevskiy Reviewed-by: David Gibson Signed-off-by: David Gibson --- hw/ppc/spapr_iommu.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/hw/ppc/spapr_iommu.c b/hw/ppc/spapr_iommu.c index f3990fd..e19bf89 100644 --- a/hw/ppc/spapr_iommu.c +++ b/hw/ppc/spapr_iommu.c @@ -126,11 +126,11 @@ static MemoryRegionIOMMUOps spapr_iommu_ops = { static int spapr_tce_table_realize(DeviceState *dev) { sPAPRTCETable *tcet = SPAPR_TCE_TABLE(dev); + uint64_t window_size = (uint64_t)tcet->nb_table << tcet->page_shift; - if (kvm_enabled()) { + if (kvm_enabled() && !(window_size >> 32)) { tcet->table = kvmppc_create_spapr_tce(tcet->liobn, - tcet->nb_table << - tcet->page_shift, + window_size, &tcet->fd, tcet->vfio_accel); } -- 2.1.0