KVM: x86: Save and reload SSP to/from SMRAM

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Save CET SSP to SMRAM on SMI and reload it on RSM. KVM emulates HW arch
behavior when guest enters/leaves SMM mode,i.e., save registers to SMRAM
at the entry of SMM and reload them at the exit to SMM. Per SDM, SSP is
one of such registers on 64-bit Arch, and add the support for SSP.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Yang Weijiang <weijiang.yang@intel.com>
Tested-by: Mathias Krause <minipli@grsecurity.net>
Tested-by: John Allen <john.allen@amd.com>
Tested-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Signed-off-by: Chao Gao <chao.gao@intel.com>
Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Link: https://lore.kernel.org/r/20250919223258.1604852-16-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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Yang Weijiang 2025-09-19 15:32:22 -07:00 • committed by Sean Christopherson

parent 8b59d0275c

commit 1a61bd0d12

2 changed files with 9 additions and 1 deletions

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8

arch/x86/kvm/smm.c

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2

arch/x86/kvm/smm.h

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