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

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Date:   Thu, 29 Jul 2021 15:28:55 +0200
From:   Claudio Imbrenda <imbrenda@...ux.ibm.com>
To:     Janosch Frank <frankja@...ux.ibm.com>
Cc:     kvm@...r.kernel.org, cohuck@...hat.com, borntraeger@...ibm.com,
        thuth@...hat.com, pasic@...ux.ibm.com, david@...hat.com,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 13/13] KVM: s390: pv: add support for UV feature bits

On Thu, 29 Jul 2021 11:52:58 +0200
Janosch Frank <frankja@...ux.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@...ux.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;
> >  }
> >  
> >   
>