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: ========= v4->v5: * Move __read_mostly attribute to place where sev_cfg is declared (Tom) v3->v4: * Remove an irrelevant header (Boris) * Rebase on latest tip/master * Link: https://lore.kernel.org/all/20240922033626.29038-1-papaluri@xxxxxxx/ 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 | 29 ++++++++++++ arch/x86/virt/svm/Makefile | 1 + arch/x86/virt/svm/cmdline.c | 39 ++++++++++++++++ 5 files changed, 72 insertions(+), 44 deletions(-) create mode 100644 arch/x86/virt/svm/cmdline.c base-commit: d1b8f40d000887720e0c123c382d75e7fbb75cb6 -- 2.34.1
