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Message-ID: <20240905143056.48216-1-papaluri@amd.com>
Date: Thu, 5 Sep 2024 09:30:54 -0500
From: Pavan Kumar Paluri <papaluri@....com>
To: <linux-kernel@...r.kernel.org>
CC: <linux-doc@...r.kernel.org>, Borislav Petkov <bp@...en8.de>, "Thomas
Gleixner" <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Dave Hansen
<dave.hansen@...ux.intel.com>, Eric Van Tassell <Eric.VanTassell@....com>,
Tom Lendacky <thomas.lendacky@....com>, Ashish Kalra <ashish.kalra@....com>,
Michael Roth <michael.roth@....com>, "H . Peter Anvin" <hpa@...or.com>,
"Peter Zijlstra" <peterz@...radead.org>, Pavan Kumar Paluri
<papaluri@....com>
Subject: [PATCH v3 0/2] nosnp sev command line support
Provide "nosnp" boot option via "sev=nosnp" kernel command line to
prevent SEV-SNP[1] capable host kernel from enabling SEV-SNP and
initializing Reverse Map Table (RMP) [1].
On providing sev=nosnp via kernel command line:
cat /sys/module/kvm_amd/parameters/sev_snp should be "N".
This patchset is based on tip/master.
Reference:
[1] https://www.amd.com/content/dam/amd/en/documents/processor-tech-docs/programmer-references/24593.pdf
Changelog:
v2->v3:
* Fix the build warning reported by kernel test robot
v1->v2:
* Pick R-b's from Tom.
* Include only those headers that provide the necessary definitions (Boris)
* Provide appropriate references to SEV, SNP and RMP (Matthew)
---
Pavan Kumar Paluri (2):
x86, KVM:SVM: Move sev specific parsing into arch/x86/virt/svm
x86 KVM:SVM: Provide "nosnp" boot option for sev kernel command line
.../arch/x86/x86_64/boot-options.rst | 3 ++
arch/x86/coco/sev/core.c | 44 -------------------
arch/x86/include/asm/sev-common.h | 30 +++++++++++++
arch/x86/virt/svm/Makefile | 1 +
arch/x86/virt/svm/cmdline.c | 39 ++++++++++++++++
5 files changed, 73 insertions(+), 44 deletions(-)
create mode 100644 arch/x86/virt/svm/cmdline.c
base-commit: 566644cc51d0b1ab7e98ea479808b1efd0bbe261
--
2.34.1
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