Re: [PATCH v4 0/7] KVM: x86: Add LASS virtualization support

[Chen, Farrah]

On 8/6/2026 9:15 AM, Sohil Mehta wrote:
> Linear Address Space Separation (LASS) is a security feature that blocks
> accesses across the user/kernel boundary based on bit 63 of the linear
> address alone, before any page walk is performed. Host support for LASS
> has been merged [1][2]. This series adds the KVM virtualization support.
>  
I tested this series on Clearwater Forest (CWF), running a KVM guest 
with -cpu host. Exposing LASS to the guest also requires the QEMU 
support linked below. With both series applied, LASS is correctly 
enumerated in the guest, and the LASS functional tests pass with 
vsyscall=none/xonly/emulate.

QEMU changes to expose LASS to guests:
https://lore.kernel.org/all/20260826035734.114685-1-kishen.maloor@xxxxxxxxx/

Tested-by: Farrah Chen <farrah.chen@xxxxxxxxx>