Re: [kvm-unit-tests PATCH 0/8] x86: CET fixes and enhancements

[Chao Gao <chao.gao@intel.com>]

On Fri, Jun 20, 2025 at 05:39:04PM +0200, Mathias Krause wrote:
>Hi,
>
>I'm playing with the CET virtualization patch set[1] and was looking at
>the CET tests and noticed a few obvious issues with it (flushing the
>wrong address) as well as some missing parts (testing far rets).
>
>[1] https://lore.kernel.org/kvm/20240219074733.122080-1-weijiang.yang@intel.com/

Hi Mathias,

Thank you.

I posted a series https://lore.kernel.org/kvm/20250513072250.568180-1-chao.gao@intel.com/
to fix issues and add nested test cases. we may consider merging them into one series. e.g.,

>
>Below is a small series with fixes and cleanups.
>
>Please apply!
>
>Thanks,
>Mathias
>
>
>Mathias Krause (8):
>  x86: Avoid top-most page for vmalloc on x86-64
>  x86/cet: Fix flushing shadow stack mapping
>  x86/cet: Use NONCANONICAL for non-canonical address

This will be not needed as my series eliminates the jump to a non-canonical
address.

>  x86/cet: Make shadow stack less fragile
>  x86/cet: Avoid unnecessary function pointer casts
>  x86/cet: Simplify IBT test
>  x86/cet: Track and verify #CP error code

We can use exception_error_code() to retrieve the error code instead of adding
a global variable.

>  x86/cet: Test far returns too
>
> lib/x86/vm.c |  2 ++
> x86/cet.c    | 81 ++++++++++++++++++++++++++++++++++++++++------------
> 2 files changed, 64 insertions(+), 19 deletions(-)
>
>-- 
>2.47.2
>