linux-kernel - [PATCH v8 0/2] Support TDX guests on Hyper-V (the x86/tdx part)

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Date:   Tue, 20 Jun 2023 08:48:28 -0700
From:   Dexuan Cui <decui@...rosoft.com>
To:     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
Cc:     linux-kernel@...r.kernel.org, Tianyu.Lan@...rosoft.com,
        rick.p.edgecombe@...el.com, Dexuan Cui <decui@...rosoft.com>
Subject: [PATCH v8 0/2] Support TDX guests on Hyper-V (the x86/tdx part)

v8 is a rebased version of v7:
  v8 is based on tip.git's master branch, which has commit
      75d090fd167a ("x86/tdx: Add unaccepted memory support"), so I have
      to rebase v7 to the commit and post v8.

  v7 is based on tip.git's x86/tdx branch.

The two patches (which are based on the latest master branch of 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 v8 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 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/master/tdx/v8-x86-tdx-only

Dexuan Cui (2):
  x86/tdx: Retry TDVMCALL_MAP_GPA() when needed
  x86/tdx: Support vmalloc() for tdx_enc_status_changed()

 arch/x86/coco/tdx/tdx.c           | 86 ++++++++++++++++++++++++++-----
 arch/x86/include/asm/shared/tdx.h |  2 +
 2 files changed, 76 insertions(+), 12 deletions(-)

-- 
2.25.1