Re: [PATCH 0/3] x86/umip: Fix UMIP insn decoder false positives

[Sean Christopherson]

On Fri, Aug 08, 2025, Sean Christopherson wrote:
> Fix two false positives scenarios where the UMIP #GP logic will incorrectly
> trigger emulation, e.g. due to a partially decoded instruction, or on
> instructions like VMLAUNCH that usurp the register form of '0f 01'.
> 
> Tested with the hack-a-test patch at the end, but I haven't done any testing
> using a real userspace (neither positive nor negative testing).
> 
> Sean Christopherson (3):
>   x86/umip: Check that the instruction opcode is at least two bytes
>   x86/umip: Fix decoding of register forms of 0F 01 (SGDT and SIDT
>     aliases)

Ping on these two, looks like they slipped through the cracks.  FWIW, I wouldn't
consider these urgent enough to squeeze into 6.17, but it'd be nice to get them
into 6.18.