Re: [PATCH v6 4/8] KVM: nSVM: Propagate hardware DecodeAssist bytes to VMCB12

[Jim Mattson]

On Sat, Sep 12, 2026 at 11:44 PM Tina Zhang <zhang_wei@xxxxxxxxxxxxxx> wrote:
>
> DecodeAssists provides instruction bytes for nested page faults and
> intercepted page faults caused by data accesses.  When the feature is
> exposed to L1, copy fresh hardware-provided instruction bytes from VMCB02
> to VMCB12 for these exits.
>
> Leave the VMCB12 instruction-byte state untouched when DecodeAssists is
> not exposed.  Otherwise, invalidate the state for instruction-fetch page
> faults, unrelated exits, and exits without fresh hardware bytes.
>
> Signed-off-by: Tina Zhang <zhang_wei@xxxxxxxxxxxxxx>
Reviewed-by: Jim Mattson <jmattson@xxxxxxxxxx>