Re: [PATCH v2 07/13] KVM: x86: Protect MSR-based index computations in fixed_msr_to_seg_unit() from Spectre-v1/L1TF attacks

[Jim Mattson]

On Wed, Dec 11, 2019 at 12:48 PM Marios Pomonis <pomonis@xxxxxxxxxx> wrote:
>
> This fixes a Spectre-v1/L1TF vulnerability in fixed_msr_to_seg_unit().
> This function contains index computations based on the
> (attacker-controlled) MSR number.
>
> Fixes: commit de9aef5e1ad6 ("KVM: MTRR: introduce fixed_mtrr_segment table")
>
> Signed-off-by: Nick Finco <nifi@xxxxxxxxxx>
> Signed-off-by: Marios Pomonis <pomonis@xxxxxxxxxx>
> Reviewed-by: Andrew Honig <ahonig@xxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx

Reviewed-by: Jim Mattson <jmattson@xxxxxxxxxx>