Re: [PATCH v12 00/10] Introduce support for guest CET feature

[Yang Weijiang]

On Wed, May 06, 2020 at 04:20:59PM +0800, Yang Weijiang wrote:
> Control-flow Enforcement Technology (CET) provides protection against
> Return/Jump-Oriented Programming (ROP/JOP) attack. There're two CET
> sub-features: Shadow Stack (SHSTK) and Indirect Branch Tracking (IBT).
> SHSTK is to prevent ROP programming and IBT is to prevent JOP programming.
> 
> Several parts in KVM have been updated to provide VM CET support, including:
> CPUID/XSAVES config, MSR pass-through, user space MSR access interface, 
> vmentry/vmexit config, nested VM etc. These patches have dependency on CET
> kernel patches for xsaves support and CET definitions, e.g., MSR and related
> feature flags.
> 
> CET kernel patches are here:
> https://lkml.kernel.org/r/20200429220732.31602-1-yu-cheng.yu@xxxxxxxxx
> 
> v12:
> - Fixed a few issues per Sean and Paolo's review feeback.
> - Refactored patches to make them properly arranged.
> - Removed unnecessary hard-coded CET states for host/guest.
> - Added compile-time assertions for vmcs_field_to_offset_table to detect
>   mismatch of the field type and field encoding number.
> - Added a custom MSR MSR_KVM_GUEST_SSP for guest active SSP save/restore.
> - Rebased patches to 5.7-rc3.
> 
ping...

Sean and Paolo,
Could you review v12 at your convenience? Thank you!