On Mon, 19 Jul 2021 11:47:26 +0100,
Quentin Perret <qperret@xxxxxxxxxx> wrote:
>
> The nVHE protected mode uses invalid mappings in the host stage-2
> page-table to track the owner of each page in the system. In order to
> allow the usage of ignored bits (a.k.a. software bits) in these
> mappings, move the owner encoding away from the top bits.
But that's exactly what the current situation is allowing: the use of
the SW bits. I am guessing that what you really mean is that you want
to *preserve* the SW bits from an existing mapping and use other bits
when the mapping is invalid?
Thanks,
M.
>
> Signed-off-by: Quentin Perret <qperret@xxxxxxxxxx>
> ---
> arch/arm64/kvm/hyp/pgtable.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/arm64/kvm/hyp/pgtable.c b/arch/arm64/kvm/hyp/pgtable.c
> index a60653cbd8e5..a0ac8c2bc174 100644
> --- a/arch/arm64/kvm/hyp/pgtable.c
> +++ b/arch/arm64/kvm/hyp/pgtable.c
> @@ -50,7 +50,7 @@
> KVM_PTE_LEAF_ATTR_LO_S2_S2AP_W | \
> KVM_PTE_LEAF_ATTR_HI_S2_XN)
>
> -#define KVM_INVALID_PTE_OWNER_MASK GENMASK(63, 56)
> +#define KVM_INVALID_PTE_OWNER_MASK GENMASK(9, 2)
> #define KVM_MAX_OWNER_ID 1
>
> struct kvm_pgtable_walk_data {
> --
> 2.32.0.402.g57bb445576-goog
>
>
--
Without deviation from the norm, progress is not possible.
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