linux-kernel - [PATCH v2 0/3] x86/snp: Add kexec support

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Date: Mon, 18 Mar 2024 07:02:13 +0000
From: Ashish Kalra <Ashish.Kalra@....com>
To: <tglx@...utronix.de>, <mingo@...hat.com>, <dave.hansen@...ux.intel.com>
CC: <rafael@...nel.org>, <peterz@...radead.org>, <adrian.hunter@...el.com>,
	<sathyanarayanan.kuppuswamy@...ux.intel.com>, <elena.reshetova@...el.com>,
	<jun.nakajima@...el.com>, <rick.p.edgecombe@...el.com>,
	<thomas.lendacky@....com>, <seanjc@...gle.com>, <michael.roth@....com>,
	<kai.huang@...el.com>, <bhe@...hat.com>, <kexec@...ts.infradead.org>,
	<linux-coco@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
	<kirill.shutemov@...ux.intel.com>, <bdas@...hat.com>, <vkuznets@...hat.com>,
	<dionnaglaze@...gle.com>, <anisinha@...hat.com>, <jroedel@...e.de>
Subject: [PATCH v2 0/3] x86/snp: Add kexec support

From: Ashish Kalra <ashish.kalra@....com>

The patchset adds bits and pieces to get kexec (and crashkernel) work on
SNP guest.

v2:
- address zeroing of unaccepted memory table mappings at all page table levels
  adding phys_pte_init(), phys_pud_init() and phys_p4d_init().
- include skip efi_arch_mem_reserve() in case of kexec as part of this 
  patch set.
- rename last_address_shd_kexec to a more appropriate 
  kexec_last_address_to_make_private.
- remove duplicate code shared with TDX and use common interfaces
  defined for SNP and TDX for kexec/kdump.
- remove set_pte_enc() dependency on pg_level_to_pfn() and make the 
  function simpler.
- rename unshare_pte() to make_pte_private().
- clarify and make the comment for using kexec_last_address_to_make_private  
  more understandable.
- general cleanup. 

Ashish Kalra (3):
  efi/x86: skip efi_arch_mem_reserve() in case of kexec.
  x86/mm: Do not zap page table entries mapping unaccepted memory table
    during kdump.
  x86/snp: Convert shared memory back to private on kexec

 arch/x86/include/asm/probe_roms.h |   1 +
 arch/x86/include/asm/sev.h        |   4 +
 arch/x86/kernel/probe_roms.c      |  16 +++
 arch/x86/kernel/sev.c             | 169 ++++++++++++++++++++++++++++++
 arch/x86/mm/init_64.c             |  16 ++-
 arch/x86/mm/mem_encrypt_amd.c     |   3 +
 arch/x86/platform/efi/quirks.c    |  10 ++
 7 files changed, 215 insertions(+), 4 deletions(-)

-- 
2.34.1