linux-kernel - Re: [PATCH V7 2/5] x86/hyper-v: Add hyperv Isolation VM check in the cc_platform

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Date:   Tue, 14 Dec 2021 16:10:04 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Tianyu Lan <ltykernel@...il.com>, kys@...rosoft.com,
        haiyangz@...rosoft.com, sthemmin@...rosoft.com, wei.liu@...nel.org,
        decui@...rosoft.com, tglx@...utronix.de, mingo@...hat.com,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        davem@...emloft.net, kuba@...nel.org, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, arnd@...db.de, hch@...radead.org,
        m.szyprowski@...sung.com, robin.murphy@....com,
        thomas.lendacky@....com, Tianyu.Lan@...rosoft.com,
        michael.h.kelley@...rosoft.com, iommu@...ts.linux-foundation.org,
        linux-arch@...r.kernel.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, hch@....de, joro@...tes.org,
        parri.andrea@...il.com, dave.hansen@...el.com
Subject: Re: [PATCH V7 2/5] x86/hyper-v: Add hyperv Isolation VM check in the
 cc_platform_has()

On Tue, Dec 14, 2021 at 05:05:01PM +0100, Borislav Petkov wrote:
> On Mon, Dec 13, 2021 at 02:14:03AM -0500, Tianyu Lan wrote:
> > From: Tianyu Lan <Tianyu.Lan@...rosoft.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@...e.de>

Thanks. I can address your comments when I pick up this series.

Wei.

> 
> Thx.
> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> https://people.kernel.org/tglx/notes-about-netiquette