linux-kernel - Re: [PATCH 2/2] iommu: Use the user PGD for SVA if PTI is enabled

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Message-ID: <3bfa9a4b-d09a-bb23-f66c-55166350c6f0@intel.com>
Date:   Mon, 22 Aug 2022 16:25:36 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, iommu@...ts.linux.dev,
        x86@...nel.org, Joerg Roedel <joro@...tes.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
        "Tian, Kevin" <kevin.tian@...el.com>, Yi Liu <yi.l.liu@...el.com>
Subject: Re: [PATCH 2/2] iommu: Use the user PGD for SVA if PTI is enabled

On 8/22/22 16:24, Jacob Pan wrote:
> Sounds good. I thought about a helper also, thinking there are so many other
> cpu_has(X86_FEATURE_PTI) checks already :)

Yes, but almost all of those are in PTI-#ifdef'd code already.