linux-kernel - Re: [PATCH 04/12] Drivers: hv: Explicitly request decrypted in vmap

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Message-ID: <abeab056-84d6-4fd6-3611-9090eca6a359@gmail.com>
Date:   Thu, 3 Nov 2022 22:02:02 +0800
From:   Tianyu Lan <ltykernel@...il.com>
To:     Michael Kelley <mikelley@...rosoft.com>, hpa@...or.com,
        kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, decui@...rosoft.com, luto@...nel.org,
        peterz@...radead.org, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, lpieralisi@...nel.org,
        robh@...nel.org, kw@...ux.com, bhelgaas@...gle.com, arnd@...db.de,
        hch@...radead.org, m.szyprowski@...sung.com, robin.murphy@....com,
        thomas.lendacky@....com, brijesh.singh@....com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        Tianyu.Lan@...rosoft.com, kirill.shutemov@...ux.intel.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com, ak@...ux.intel.com,
        isaku.yamahata@...el.com, dan.j.williams@...el.com,
        jane.chu@...cle.com, seanjc@...gle.com, tony.luck@...el.com,
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        linux-pci@...r.kernel.org, linux-arch@...r.kernel.org,
        iommu@...ts.linux.dev
Subject: Re: [PATCH 04/12] Drivers: hv: Explicitly request decrypted in
 vmap_pfn() calls

On 10/21/2022 1:57 AM, Michael Kelley wrote:
> In preparation for a subsequent patch, update vmap_pfn() calls to
> explicitly request that the mapping be for decrypted access to
> the memory.  There's no change in functionality since the PFNs
> passed to vmap_pfn() are above the shared_gpa_boundary, implicitly
> producing a decrypted mapping. But explicitly requesting decrypted
> allows the code to work before and after a subsequent patch
> that will cause vmap_pfn() to mask the PFNs to being below the
> shared_gpa_boundary. While another subsesquent patch removes the
> vmap_pfn() calls entirely, this temporary tweak avoids the need
> for a large patch that makes all the changes at once.
> 
> Signed-off-by: Michael Kelley<mikelley@...rosoft.com>
> ---

Reviewed-by: Tianyu Lan <Tianyu.Lan@...rosoft.com>