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Date: Thu, 5 Nov 2020 10:19:36 +0800 From: Zhenzhong Duan <zhenzhong.duan@...il.com> To: Lu Baolu <baolu.lu@...ux.intel.com> Cc: linux-kernel <linux-kernel@...r.kernel.org>, David Woodhouse <dwmw2@...radead.org>, Joerg Roedel <joro@...tes.org>, iommu@...ts.linux-foundation.org Subject: Re: [PATCH] iommu/vt-d: remove redundant variable no_platform_optin Hi Baolu, On Thu, Nov 5, 2020 at 9:47 AM Lu Baolu <baolu.lu@...ux.intel.com> wrote: > > Hi Zhenzhong, > > On 11/4/20 4:19 PM, Zhenzhong Duan wrote: > > no_platform_optin is redundant with dmar_disabled and it's only used in > > platform_optin_force_iommu(), remove it and use dmar_disabled instead. > > It's actually not. > > If CONFIG_INTEL_IOMMU_DEFAULT_ON is not set, we will get "dmar_disable = > 1" and "no_platform_optin = 0". In this case, we must force the iommu on > and set dmar_disable = 0. > > The real use case: if a kernel built with [CONFIG_INTEL_IOMMU_DEFAULT_ON > = n] running on a platform with thunderbolt ports, we must force IOMMU > on so that the system could be protected from possible malicious > peripherals. Thanks for your explanation, clear now and sorry for the noise. Regards Zhenzhong
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