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From: Janis Schoetterl-Glausch <scgl@linux.vnet.ibm.com>
To: Claudio Imbrenda <imbrenda@linux.ibm.com>, kvm@vger.kernel.org
Cc: cohuck@redhat.com, borntraeger@de.ibm.com, frankja@linux.ibm.com,
	thuth@redhat.com, pasic@linux.ibm.com, david@redhat.com,
	linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
	Ulrich.Weigand@de.ibm.com
Subject: Re: [PATCH v4 10/14] KVM: s390: pv: usage counter instead of flag
Date: Thu, 26 Aug 2021 09:58:17 +0200	[thread overview]
Message-ID: <8cca2dd4-ede1-87f9-c287-6189e89d1b39@linux.vnet.ibm.com> (raw)
In-Reply-To: <20210818132620.46770-11-imbrenda@linux.ibm.com>

Am 18.08.21 um 15:26 schrieb Claudio Imbrenda:
> Use the is_protected field as a counter instead of a flag. This will
> be used in upcoming patches.

Maybe it should also be renamed to reflect that?
> 
> Increment the counter when a secure configuration is created, and
> decrement it when it is destroyed. Previously the flag was set when the
> set secure parameters UVC was performed.
> 
> Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
> Acked-by: Janosch Frank <frankja@linux.ibm.com>
> ---
>  arch/s390/kvm/pv.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/s390/kvm/pv.c b/arch/s390/kvm/pv.c
> index 47db80003ea0..ee11ff6afc4f 100644
> --- a/arch/s390/kvm/pv.c
> +++ b/arch/s390/kvm/pv.c
> @@ -173,7 +173,8 @@ int kvm_s390_pv_deinit_vm(struct kvm *kvm, u16 *rc, u16 *rrc)
>  	cc = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
>  			   UVC_CMD_DESTROY_SEC_CONF, rc, rrc);
>  	WRITE_ONCE(kvm->arch.gmap->guest_handle, 0);
> -	atomic_set(&kvm->mm->context.is_protected, 0);
> +	if (!cc)
> +		atomic_dec(&kvm->mm->context.is_protected);
>  	KVM_UV_EVENT(kvm, 3, "PROTVIRT DESTROY VM: rc %x rrc %x", *rc, *rrc);
>  	WARN_ONCE(cc, "protvirt destroy vm failed rc %x rrc %x", *rc, *rrc);
>  	/* Intended memory leak on "impossible" error */
> @@ -214,11 +215,14 @@ int kvm_s390_pv_init_vm(struct kvm *kvm, u16 *rc, u16 *rrc)
>  	/* Outputs */
>  	kvm->arch.pv.handle = uvcb.guest_handle;
> 
> +	atomic_inc(&kvm->mm->context.is_protected);
>  	if (cc) {
> -		if (uvcb.header.rc & UVC_RC_NEED_DESTROY)
> +		if (uvcb.header.rc & UVC_RC_NEED_DESTROY) {
>  			kvm_s390_pv_deinit_vm(kvm, &dummy, &dummy);
> -		else
> +		} else {
> +			atomic_dec(&kvm->mm->context.is_protected);
>  			kvm_s390_pv_dealloc_vm(kvm);
> +		}
>  		return -EIO;
>  	}
>  	kvm->arch.gmap->guest_handle = uvcb.guest_handle;
> @@ -241,8 +245,6 @@ int kvm_s390_pv_set_sec_parms(struct kvm *kvm, void *hdr, u64 length, u16 *rc,
>  	*rrc = uvcb.header.rrc;
>  	KVM_UV_EVENT(kvm, 3, "PROTVIRT VM SET PARMS: rc %x rrc %x",
>  		     *rc, *rrc);
> -	if (!cc)
> -		atomic_set(&kvm->mm->context.is_protected, 1);
>  	return cc ? -EINVAL : 0;
>  }
> 


  reply	other threads:[~2021-08-26  7:58 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-18 13:26 [PATCH v4 00/14] KVM: s390: pv: implement lazy destroy for reboot Claudio Imbrenda
2021-08-18 13:26 ` [PATCH v4 01/14] KVM: s390: pv: add macros for UVC CC values Claudio Imbrenda
2021-08-31 13:43   ` Christian Borntraeger
2021-08-18 13:26 ` [PATCH v4 02/14] KVM: s390: pv: avoid double free of sida page Claudio Imbrenda
2021-08-31 13:55   ` Christian Borntraeger
2021-09-08 18:50     ` Claudio Imbrenda
2021-08-31 13:59   ` Janosch Frank
2021-08-18 13:26 ` [PATCH v4 03/14] KVM: s390: pv: avoid stalls for kvm_s390_pv_init_vm Claudio Imbrenda
2021-08-31 14:10   ` Christian Borntraeger
2021-08-18 13:26 ` [PATCH v4 04/14] KVM: s390: pv: avoid stalls when making pages secure Claudio Imbrenda
2021-08-31 14:32   ` Christian Borntraeger
2021-08-31 15:00     ` Claudio Imbrenda
2021-08-31 15:11       ` Christian Borntraeger
2021-08-18 13:26 ` [PATCH v4 05/14] KVM: s390: pv: leak the ASCE page when destroy fails Claudio Imbrenda
2021-09-06 15:32   ` Christian Borntraeger
2021-09-06 15:54     ` Claudio Imbrenda
2021-08-18 13:26 ` [PATCH v4 06/14] KVM: s390: pv: properly handle page flags for protected guests Claudio Imbrenda
2021-09-06 15:46   ` Christian Borntraeger
2021-09-06 15:56     ` Claudio Imbrenda
2021-09-06 16:16       ` Christian Borntraeger
2021-09-17 14:57         ` Claudio Imbrenda
2021-08-18 13:26 ` [PATCH v4 07/14] KVM: s390: pv: handle secure storage violations " Claudio Imbrenda
2021-08-18 13:26 ` [PATCH v4 08/14] KVM: s390: pv: handle secure storage exceptions for normal guests Claudio Imbrenda
2021-08-18 13:26 ` [PATCH v4 09/14] KVM: s390: pv: refactor s390_reset_acc Claudio Imbrenda
2021-08-18 13:26 ` [PATCH v4 10/14] KVM: s390: pv: usage counter instead of flag Claudio Imbrenda
2021-08-26  7:58   ` Janis Schoetterl-Glausch [this message]
2021-08-18 13:26 ` [PATCH v4 11/14] KVM: s390: pv: add export before import Claudio Imbrenda
2021-08-18 13:26 ` [PATCH v4 12/14] KVM: s390: pv: module parameter to fence lazy destroy Claudio Imbrenda
2021-08-18 13:26 ` [PATCH v4 13/14] KVM: s390: pv: lazy destroy for reboot Claudio Imbrenda
2021-08-26  8:33   ` Janis Schoetterl-Glausch
2021-08-18 13:26 ` [PATCH v4 14/14] KVM: s390: pv: avoid export before import if possible Claudio Imbrenda

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