On Mon, Aug 05, 2013 at 12:59:19PM +0800, Xiao Guangrong wrote:
> Current code always uses arch.mmu to check the reserved bits on guest gpte
> which is valid only for L1 guest, we should use arch.nested_mmu instead when
> we translate gva to gpa for the L2 guest
>
> Fix it by using @mmu instead since it is adapted to the current mmu mode
> automatically
>
> The bug can be triggered when nested npt is used and L1 guest and L2 guest
> use different mmu mode
>
> Reported-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
> Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Gleb Natapov <gleb@xxxxxxxxxx>
> ---
> arch/x86/kvm/paging_tmpl.h | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
> index 7769699..3a75828 100644
> --- a/arch/x86/kvm/paging_tmpl.h
> +++ b/arch/x86/kvm/paging_tmpl.h
> @@ -218,8 +218,7 @@ retry_walk:
> if (unlikely(!is_present_gpte(pte)))
> goto error;
>
> - if (unlikely(is_rsvd_bits_set(&vcpu->arch.mmu, pte,
> - walker->level))) {
> + if (unlikely(is_rsvd_bits_set(mmu, pte, walker->level))) {
> errcode |= PFERR_RSVD_MASK | PFERR_PRESENT_MASK;
> goto error;
> }
> --
> 1.8.1.4
--
Gleb.
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