linux-kernel - [PATCHv2 0/3] x86/tdx: Fix one more load_unaligned

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Message-Id: <20230526120225.31936-1-kirill.shutemov@linux.intel.com>
Date:   Fri, 26 May 2023 15:02:22 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     dave.hansen@...el.com, tglx@...utronix.de, mingo@...hat.com,
        bp@...en8.de
Cc:     decui@...rosoft.com, rick.p.edgecombe@...el.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com, seanjc@...gle.com,
        thomas.lendacky@....com, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCHv2 0/3] x86/tdx: Fix one more load_unaligned_zeropad() issue

During review of TDX guests on Hyper-V patchset Dave pointed to the
potential race between changing page private/shared status and
load_unaligned_zeropad().

Fix the issue.

v2:
 - Add more info in commit message of the first patch.
 - Move enc_status_change_finish_noop() into a separate patch.
 - Fix typo in commit message and comment.

Kirill A. Shutemov (3):
  x86/mm: Allow guest.enc_status_change_prepare() to fail
  x86/tdx: Fix race between set_memory_encrypted() and
    load_unaligned_zeropad()
  x86/mm: Fix enc_status_change_finish_noop()

 arch/x86/coco/tdx/tdx.c         | 56 +++++++++++++++++++++++++++++++--
 arch/x86/include/asm/x86_init.h |  2 +-
 arch/x86/kernel/x86_init.c      |  4 +--
 arch/x86/mm/mem_encrypt_amd.c   |  4 ++-
 arch/x86/mm/pat/set_memory.c    |  3 +-
 5 files changed, 61 insertions(+), 8 deletions(-)

-- 
2.39.3