linux-kernel - Re: [PATCH 3/5] hyperv/IOMMU: Enable swiotlb bounce buffer for Isolation VM

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Date:   Wed, 17 Nov 2021 21:22:27 +0800
From:   Tianyu Lan <ltykernel@...il.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        tglx@...utronix.de, mingo@...hat.com, x86@...nel.org,
        hpa@...or.com, jgross@...e.com, sstabellini@...nel.org,
        boris.ostrovsky@...cle.com, kys@...rosoft.com,
        haiyangz@...rosoft.com, sthemmin@...rosoft.com, wei.liu@...nel.org,
        decui@...rosoft.com, joro@...tes.org, will@...nel.org,
        davem@...emloft.net, kuba@...nel.org, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, hch@....de, m.szyprowski@...sung.com,
        robin.murphy@....com, xen-devel@...ts.xenproject.org,
        michael.h.kelley@...rosoft.com,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        iommu@...ts.linux-foundation.org, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        netdev@...r.kernel.org, vkuznets@...hat.com, brijesh.singh@....com,
        konrad.wilk@...cle.com, parri.andrea@...il.com,
        thomas.lendacky@....com, dave.hansen@...el.com
Subject: Re: [PATCH 3/5] hyperv/IOMMU: Enable swiotlb bounce buffer for
 Isolation VM



On 11/17/2021 3:12 AM, Borislav Petkov wrote:
> What you should do, instead, is add an isol. VM specific
> hv_cc_platform_has() just like amd_cc_platform_has() and handle
> the cc_attrs there for your platform, like return false for
> CC_ATTR_GUEST_MEM_ENCRYPT and then you won't need to add that hv_* thing
> everywhere.
> 
> And then fix it up in __set_memory_enc_dec() too.
>

Yes, agree. Will add hv cc_attrs and check via cc_platform_has().