Date:   Tue, 14 Dec 2021 17:05:01 +0100
From:   Borislav Petkov <bp@alien8.de>
To:     Tianyu Lan <ltykernel@gmail.com>
Cc:     kys@microsoft.com, haiyangz@microsoft.com, sthemmin@microsoft.com,
        wei.liu@kernel.org, decui@microsoft.com, tglx@linutronix.de,
        mingo@redhat.com, dave.hansen@linux.intel.com, x86@kernel.org,
        hpa@zytor.com, davem@davemloft.net, kuba@kernel.org,
        jejb@linux.ibm.com, martin.petersen@oracle.com, arnd@arndb.de,
        hch@infradead.org, m.szyprowski@samsung.com, robin.murphy@arm.com,
        thomas.lendacky@amd.com, Tianyu.Lan@microsoft.com,
        michael.h.kelley@microsoft.com, iommu@lists.linux-foundation.org,
        linux-arch@vger.kernel.org, linux-hyperv@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org,
        netdev@vger.kernel.org, vkuznets@redhat.com, brijesh.singh@amd.com,
        konrad.wilk@oracle.com, hch@lst.de, joro@8bytes.org,
        parri.andrea@gmail.com, dave.hansen@intel.com
Subject: Re: [PATCH V7 2/5] x86/hyper-v: Add hyperv Isolation VM check in the
 cc_platform_has()
Message-ID: <YbjArUL+biZMsFOL@zn.tnic>
References: <20211213071407.314309-1-ltykernel@gmail.com>
 <20211213071407.314309-3-ltykernel@gmail.com>
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On Mon, Dec 13, 2021 at 02:14:03AM -0500, Tianyu Lan wrote:
> From: Tianyu Lan <Tianyu.Lan@microsoft.com>
> 
> Hyper-V provides Isolation VM for confidential computing support and
> guest memory is encrypted in it. Places checking cc_platform_has()
> with GUEST_MEM_ENCRYPT attr should return "True" in Isolation vm. e.g,

Stick to a single spelling variant: "VM".

> swiotlb bounce buffer size needs to adjust according to memory size
> in the sev_setup_arch().

So basically you wanna simply say here:

"Hyper-V Isolation VMs need to adjust the SWIOTLB size just like SEV
guests. Add a hyperv_cc_platform_has() variant which enables that."

?

With that addressed you can have my

Acked-by: Borislav Petkov <bp@suse.de>

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette