linux-kernel - Re: [PATCH v7 0/2] Support TDX guests on Hyper-V (the x86/tdx part)

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Message-ID: <20230619134709.6c4sgargh67xwc5g@box.shutemov.name>
Date:   Mon, 19 Jun 2023 16:47:09 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Dexuan Cui <decui@...rosoft.com>
Cc:     ak@...ux.intel.com, arnd@...db.de, bp@...en8.de,
        brijesh.singh@....com, dan.j.williams@...el.com,
        dave.hansen@...el.com, dave.hansen@...ux.intel.com,
        haiyangz@...rosoft.com, hpa@...or.com, jane.chu@...cle.com,
        kirill.shutemov@...ux.intel.com, kys@...rosoft.com,
        linux-arch@...r.kernel.org, linux-hyperv@...r.kernel.org,
        luto@...nel.org, mingo@...hat.com, peterz@...radead.org,
        rostedt@...dmis.org, sathyanarayanan.kuppuswamy@...ux.intel.com,
        seanjc@...gle.com, tglx@...utronix.de, tony.luck@...el.com,
        wei.liu@...nel.org, x86@...nel.org, mikelley@...rosoft.com,
        linux-kernel@...r.kernel.org, Tianyu.Lan@...rosoft.com,
        rick.p.edgecombe@...el.com
Subject: Re: [PATCH v7 0/2] Support TDX guests on Hyper-V (the x86/tdx part)

On Thu, Jun 15, 2023 at 09:46:59PM -0700, Dexuan Cui wrote:
> The two patches (which are based on the latest x86/tdx branch in the tip
> tree) are the x86/tdx part of the v6 patchset:
> https://lwn.net/ml/linux-kernel/20230504225351.10765-1-decui@microsoft.com/
> 
> The other patches of the v6 patchset needs more changes in preparation for
> the upcoming paravisor support, so let me post the x86/tdx part first.
> 
> This v7 patchset addressed Dave's comments on patch 1:
> see https://lwn.net/ml/linux-kernel/SA1PR21MB1335736123C2BCBBFD7460C3BF46A@SA1PR21MB1335.namprd21.prod.outlook.com/
> 
> Patch 2 is just a repost. There was a race between set_memory_encrypted()
> and load_unaligned_zeropad(), which has been fixed by the 3 patches of
> Kirill in the x86/tdx branch of the tip tree:
>   3f6819dd192e ("x86/mm: Allow guest.enc_status_change_prepare() to fail")
>   195edce08b63 ("x86/tdx: Fix race between set_memory_encrypted() and load_unaligned_zeropad()")
>   94142c9d1bdf ("x86/mm: Fix enc_status_change_finish_noop()")
>   (see https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/log/?h=x86/tdx)
> 
> If you want to view the patchset on github, it is here:
> https://github.com/dcui/tdx/commits/decui/upstream-tip/x86/tdx/v7

JFYI, it won't apply to tip/master. Unaccepted memory changed the code you
patching.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov