linux-kernel - [PATCHv6, RESEND 0/4] x86/tdx: Adjust TD settings on boot

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Message-ID: <20241104103803.195705-1-kirill.shutemov@linux.intel.com>
Date: Mon,  4 Nov 2024 12:37:59 +0200
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>
Cc: linux-coco@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCHv6, RESEND 0/4] x86/tdx: Adjust TD settings on boot

The patchset adjusts a few TD settings on boot for the optimal functioning
of the system:

  - Disable EPT violation #VE on private memory if TD can control it

    The newer TDX module allows the guest to control whether it wants to
    see #VE on EPT violation on private memory. The Linux kernel does not
    want such #VEs and needs to disable them.

  - Enable virtualization of topology-related CPUID leafs X2APIC_APICID MSR;

    The ENUM_TOPOLOGY feature allows the VMM to provide topology
    information to the guest. Enabling the feature eliminates
    topology-related #VEs: the TDX module virtualizes accesses to the
    CPUID leafs and the MSR.

    It allows TDX guest to run with non-trivial topology configuration.

v5:
 - Rebased to current tip tree;
v4:
 - Drop unnecessary enumeration;
 - Drop TDG.SYS.RD wrapper;
 - CC stable@ for SEPT disable patch;
 - Update commit messages;
v3:
  - Update commit messages;
  - Rework patches 3/4 and 4/4;
v2:
  - Rebased;
  - Allow write to TDCS_TD_CTLS to fail;
  - Adjust commit messages;
Kirill A. Shutemov (4):
  x86/tdx: Introduce wrappers to read and write TD metadata
  x86/tdx: Rename tdx_parse_tdinfo() to tdx_setup()
  x86/tdx: Dynamically disable SEPT violations from causing #VEs
  x86/tdx: Enable CPU topology enumeration

 arch/x86/coco/tdx/tdx.c           | 140 +++++++++++++++++++++++++-----
 arch/x86/include/asm/shared/tdx.h |  13 ++-
 2 files changed, 130 insertions(+), 23 deletions(-)

-- 
2.45.2