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    SubjectRe: [PATCH v2 03/39] x86/cpufeatures: Add CPU feature flags for shadow stacks
    On Thu, Sep 29, 2022 at 03:29:00PM -0700, Rick Edgecombe wrote:
    > From: Yu-cheng Yu <yu-cheng.yu@intel.com>
    >
    > The Control-Flow Enforcement Technology contains two related features,
    > one of which is Shadow Stacks. Future patches will utilize this feature
    > for shadow stack support in KVM, so add a CPU feature flags for Shadow
    > Stacks (CPUID.(EAX=7,ECX=0):ECX[bit 7]).
    >
    > To protect shadow stack state from malicious modification, the registers
    > are only accessible in supervisor mode. This implementation
    > context-switches the registers with XSAVES. Make X86_FEATURE_SHSTK depend
    > on XSAVES.
    >
    > Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>

    Reviewed-by: Kees Cook <keescook@chromium.org>

    --
    Kees Cook

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