linux-kernel - [PATCH 0/5] x86/sev: Fix SNP host late disable

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Date: Wed, 27 Mar 2024 16:43:12 +0100
From: Borislav Petkov <bp@...en8.de>
To: X86 ML <x86@...nel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
	KVM <kvm@...r.kernel.org>,
	Ashish Kalra <ashish.kalra@....com>,
	Joerg Roedel <joro@...tes.org>,
	Michael Roth <michael.roth@....com>,
	Tom Lendacky <thomas.lendacky@....com>
Subject: [PATCH 0/5] x86/sev: Fix SNP host late disable

From: "Borislav Petkov (AMD)" <bp@...en8.de>

Hi,

the intention to track SNP host status with the CPU feature bit
X86_FEATURE_SEV_SNP was all fine and dandy but that can't work if stuff
needs to be disabled late, after alternatives patching - see patch 5.

Therefore, convert the SNP status tracking to a cc_platform*() bit.

The first two are long overdue cleanups.

If no objections, 3-5 should go in now so that 6.9 releases fixed.

Thx.

Borislav Petkov (AMD) (5):
  x86/alternatives: Remove a superfluous newline in _static_cpu_has()
  x86/alternatives: Catch late X86_FEATURE modifiers
  x86/kvm/Kconfig: Have KVM_AMD_SEV select ARCH_HAS_CC_PLATFORM
  x86/cc: Add cc_platform_set/_clear() helpers
  x86/CPU/AMD: Track SNP host status with cc_platform_*()

 arch/x86/coco/core.c               | 52 ++++++++++++++++++++++++++++++
 arch/x86/include/asm/cpufeature.h  | 11 ++++---
 arch/x86/include/asm/sev.h         |  4 +--
 arch/x86/kernel/cpu/amd.c          | 38 +++++++++++++---------
 arch/x86/kernel/cpu/cpuid-deps.c   |  3 ++
 arch/x86/kernel/cpu/mtrr/generic.c |  2 +-
 arch/x86/kernel/sev.c              | 10 ------
 arch/x86/kvm/Kconfig               |  1 +
 arch/x86/kvm/svm/sev.c             |  2 +-
 arch/x86/virt/svm/sev.c            | 26 ++++++++++-----
 drivers/crypto/ccp/sev-dev.c       |  2 +-
 drivers/iommu/amd/init.c           |  4 ++-
 include/linux/cc_platform.h        | 12 +++++++
 13 files changed, 124 insertions(+), 43 deletions(-)

-- 
2.43.0