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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4d26ba27-e235-8f2b-c59c-01d3e0691453@linux.ibm.com>
Date:   Thu, 29 Jul 2021 11:52:58 +0200
From:   Janosch Frank <frankja@...ux.ibm.com>
To:     Claudio Imbrenda <imbrenda@...ux.ibm.com>, kvm@...r.kernel.org
Cc:     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 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@...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;
>  }
>  
>