linux-kernel - [PATCHv2 0/7] x86/tdx: Changes for TDX guest initialization

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Message-Id: <20230112101407.24327-1-kirill.shutemov@linux.intel.com>
Date:   Thu, 12 Jan 2023 13:14:00 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Dave Hansen <dave.hansen@...el.com>,
        Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>
Cc:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Elena Reshetova <elena.reshetova@...el.com>, x86@...nel.org,
        linux-coco@...ts.linux.dev, linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCHv2 0/7] x86/tdx: Changes for TDX guest initialization

Several changes to TDX initialization:

- Make early panic message visible to user;

- Relax SEPT_VE_DISABLE for debug TD. It helps to investigate bugs
  resulting in access of unaccepted memory.

- Make sure NOTIFY_ENABLES is off to eliminate possible source of random
  #VE.

The patchset makes use of ReportFatalError TDVMCALL. The definition of
the TDVMCALL has changed in recent GHCI update[1]. It now requires more
arguments handled by __tdx_hypercall(). The patch that expands
__tdx_hypercall() is the same as the patch included in TDX guest
enabling for Hyper-V.

[1] https://cdrdv2.intel.com/v1/dl/getContent/726790

v2:
 - Split the first patch;
 - Intoduce is_private_gpa();
 - Apply Reviewed-by from Dave;

Kirill A. Shutemov (7):
  x86/tdx: Fix typo in comment in __tdx_hypercall()
  x86/tdx: Add more registers to struct tdx_hypercall_args
  x86/tdx: Refactor __tdx_hypercall() to allow pass down more arguments
  x86/tdx: Expand __tdx_hypercall() to handle more arguments
  x86/tdx: Use ReportFatalError to report missing SEPT_VE_DISABLE
  x86/tdx: Relax SEPT_VE_DISABLE check for debug TD
  x86/tdx: Disable NOTIFY_ENABLES

 arch/x86/coco/tdx/tdcall.S        | 83 ++++++++++++++++++++++---------
 arch/x86/coco/tdx/tdx.c           | 62 ++++++++++++++++++++++-
 arch/x86/include/asm/shared/tdx.h |  6 +++
 arch/x86/kernel/asm-offsets.c     |  6 +++
 4 files changed, 131 insertions(+), 26 deletions(-)

-- 
2.38.2