Re: [PATCH v2 13/13] KVM: s390: pv: add support for UV feature bits

Janosch Frank
2021-07-29T09:53:09Z

On 7/28/21 4:26 PM, Claudio Imbrenda wrote:
> Add support for Ultravisor feature bits, and take advantage of the
> functionality advertised to speed up the lazy destroy mechanism.

UV feature bit support is already merged please fix the description and
subject.

>
> Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
> ---
> arch/s390/kernel/uv.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c
> index f0af49b09a91..6ec3d7338ec8 100644
> --- a/arch/s390/kernel/uv.c
> +++ b/arch/s390/kernel/uv.c
> @@ -290,7 +290,8 @@ static int make_secure_pte(pte_t *ptep, unsigned long addr,
>
> static bool should_export_before_import(struct uv_cb_header *uvcb, struct mm_struct *mm)
> {
> - return uvcb->cmd != UVC_CMD_UNPIN_PAGE_SHARED &&
> + return !test_bit_inv(BIT_UV_FEAT_MISC, &uv_info.uv_feature_indications) &&
> + uvcb->cmd != UVC_CMD_UNPIN_PAGE_SHARED &&
> atomic_read(&mm->context.is_protected) > 1;
> }
>
>