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

Claudio Imbrenda
2021-07-29T13:30:13Z

On Thu, 29 Jul 2021 11:52:58 +0200
Janosch Frank <frankja@linux.ibm.com> wrote:

> 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.

oops, will be fixed

> >
> > 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;
> > }
> >
> >
>