From mboxrd@z Thu Jan 1 00:00:00 1970 From: Will Deacon Subject: Re: [PATCH 4/8] iommu/arm-smmu: set EPD1 to disable TT1 translation table walk Date: Mon, 29 Jun 2015 18:26:22 +0100 Message-ID: <20150629172622.GK17474@arm.com> References: <1435307584-9812-1-git-send-email-thunder.leizhen@huawei.com> <1435307584-9812-5-git-send-email-thunder.leizhen@huawei.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <1435307584-9812-5-git-send-email-thunder.leizhen-hv44wF8Li93QT0dZR+AlfA@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Zhen Lei Cc: "huxinwei-hv44wF8Li93QT0dZR+AlfA@public.gmane.org" , iommu , Zefan Li , Tianhong Ding , linux-arm-kernel List-Id: iommu@lists.linux-foundation.org On Fri, Jun 26, 2015 at 09:33:00AM +0100, Zhen Lei wrote: > Now we only use TT0 translation, disable TT1 translation will safer. > > Signed-off-by: Zhen Lei > --- > drivers/iommu/arm-smmu-v3.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c > index 43120ad..6d6712e 100644 > --- a/drivers/iommu/arm-smmu-v3.c > +++ b/drivers/iommu/arm-smmu-v3.c > @@ -285,6 +285,7 @@ > #define ARM64_TCR_EPD1_MASK 0x1UL > > #define CTXDESC_CD_0_ENDI (1UL << 15) > +#define CTXDESC_CD_0_EPD1 (1UL << 30) > #define CTXDESC_CD_0_V (1UL << 31) > > #define CTXDESC_CD_0_TCR_IPS_SHIFT 32 > @@ -893,7 +894,7 @@ static void arm_smmu_write_ctx_desc(struct arm_smmu_device *smmu, > #endif > CTXDESC_CD_0_R | CTXDESC_CD_0_A | CTXDESC_CD_0_ASET_PRIVATE | > CTXDESC_CD_0_AA64 | (u64)cfg->cd.asid << CTXDESC_CD_0_ASID_SHIFT | > - CTXDESC_CD_0_V; > + CTXDESC_CD_0_EPD1 | CTXDESC_CD_0_V; This is redundant. EPD1 is already set by the io-pgtable code. Will