linux-kernel - [PATCH 0/2] Kexec enabling in TDX guest

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Message-Id: <20230213234836.3683-1-kirill.shutemov@linux.intel.com>
Date:   Tue, 14 Feb 2023 02:48:34 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Dave Hansen <dave.hansen@...el.com>, Borislav Petkov <bp@...en8.de>
Cc:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Isaku Yamahata <isaku.yamahata@...el.com>, x86@...nel.org,
        linux-coco@...ts.linux.dev, kexec@...ts.infradead.org,
        linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH 0/2] Kexec enabling in TDX guest

The patch brings basic enabling of kexec in TDX guests.

By "basic enabling" I mean, kexec in the guests with a single CPU.
TDX guests use ACPI MADT MPWK to bring up secondary CPUs. The mechanism
doesn't allow to put a CPU back offline if it has woken up.

We are looking into this, but it might take time.

Kirill A. Shutemov (2):
  x86/kexec: Preserve CR4.MCE during kexec
  x86/tdx: Convert shared memory back to private on kexec

 arch/x86/coco/tdx/Makefile           |  1 +
 arch/x86/coco/tdx/kexec.c            | 82 ++++++++++++++++++++++++++++
 arch/x86/include/asm/tdx.h           |  4 ++
 arch/x86/kernel/machine_kexec_64.c   |  2 +
 arch/x86/kernel/relocate_kernel_64.S |  6 +-
 5 files changed, 94 insertions(+), 1 deletion(-)
 create mode 100644 arch/x86/coco/tdx/kexec.c

-- 
2.39.1