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From: David Hildenbrand <david@redhat.com>
To: Tony Krowiak <akrowiak@linux.vnet.ibm.com>,
	linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org
Cc: freude@de.ibm.com, schwidefsky@de.ibm.com,
	heiko.carstens@de.ibm.com, borntraeger@de.ibm.com,
	cohuck@redhat.com, kwankhede@nvidia.com,
	bjsdjshi@linux.vnet.ibm.com, pbonzini@redhat.com,
	alex.williamson@redhat.com, pmorel@linux.vnet.ibm.com,
	alifm@linux.vnet.ibm.com, mjrosato@linux.vnet.ibm.com,
	jjherne@linux.vnet.ibm.com, thuth@redhat.com,
	pasic@linux.vnet.ibm.com, berrange@redhat.com,
	fiuczy@linux.vnet.ibm.com, buendgen@de.ibm.com,
	frankja@linux.ibm.com, Tony Krowiak <akrowiak@linux.ibm.com>
Subject: Re: [PATCH v8 21/22] KVM: s390: CPU model support for AP virtualization
Date: Thu, 9 Aug 2018 10:17:21 +0200
Message-ID: <58eed530-31b3-49fe-cbd7-4d101b94daa0@redhat.com> (raw)
In-Reply-To: <1533739472-7172-22-git-send-email-akrowiak@linux.vnet.ibm.com>

On 08.08.2018 16:44, Tony Krowiak wrote:
> From: Tony Krowiak <akrowiak@linux.ibm.com>
> 
> Introduces a new CPU model feature and two CPU model
> facilities to support AP virtualization for KVM guests.
> 
> CPU model feature:
> 
> The KVM_S390_VM_CPU_FEAT_AP feature indicates that
> AP instructions are available on the guest. This
> feature will be enabled by the kernel only if the AP
> instructions are installed on the linux host. This feature
> must be specifically turned on for the KVM guest from
> userspace to use the VFIO AP device driver for guest
> access to AP devices.
> 
> CPU model facilities:
> 
> 1. AP Query Configuration Information (QCI) facility is installed.
> 
>    This is indicated by setting facilities bit 12 for
>    the guest. The kernel will not enable this facility
>    for the guest if it is not set on the host. This facility
>    must not be set by userspace if the KVM_S390_VM_CPU_FEAT_AP
>    feature is not installed.

Could it happen on real HW (not frankenstein CPU models), that

!AP, but STFL 12 or 15  are indicated?

> 
>    If this facility is not set for the KVM guest, then only
>    APQNs with an APQI less than 16 will be used by a Linux
>    guest regardless of the matrix configuration for the virtual
>    machine. This is a limitation of the Linux AP bus.
> 
> 2. AP Facilities Test facility (APFT) is installed.
> 
>    This is indicated by setting facilities bit 15 for
>    the guest. The kernel will not enable this facility for
>    the guest if it is not set on the host. This facility
>    must not be set by userspace if the KVM_S390_VM_CPU_FEAT_AP
>    feature is not installed.
> 
>    If this facility is not set for the KVM guest, then no
>    AP devices will be available to the guest regardless of
>    the guest's matrix configuration for the virtual
>    machine. This is a limitation of the Linux AP bus.
> 
> Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
> Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
> Tested-by: Michael Mueller <mimu@linux.ibm.com>
> Tested-by: Farhan Ali <alifm@linux.ibm.com>
> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
> ---
>  arch/s390/kvm/kvm-s390.c         |    7 +++++++
>  arch/s390/tools/gen_facilities.c |    2 ++
>  2 files changed, 9 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 9203f0b..7d4fe9b 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -367,6 +367,13 @@ static void kvm_s390_cpu_feat_init(void)
>  
>  	if (MACHINE_HAS_ESOP)
>  		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP);
> +
> +	/*
> +	 * Check if AP instructions installed on host
> +	 */

Make this a one-line comment, please.

> +	if (ap_instructions_available() == 0)
> +		allow_cpu_feat(KVM_S390_VM_CPU_FEAT_AP);
> +
>  	/*
>  	 * We need SIE support, ESOP (PROT_READ protection for gmap_shadow),
>  	 * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing).
> diff --git a/arch/s390/tools/gen_facilities.c b/arch/s390/tools/gen_facilities.c
> index 90a8c9e..a52290b 100644
> --- a/arch/s390/tools/gen_facilities.c
> +++ b/arch/s390/tools/gen_facilities.c
> @@ -106,6 +106,8 @@ struct facility_def {
>  
>  		.name = "FACILITIES_KVM_CPUMODEL",
>  		.bits = (int[]){
> +			12, /* AP Query Configuration Information */
> +			15, /* AP Facilities Test */
>  			-1  /* END */
>  		}
>  	},
> 


-- 

Thanks,

David / dhildenb

  reply index

Thread overview: 60+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-08 14:44 [PATCH v8 00/22] vfio-ap: guest dedicated crypto adapters Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 01/22] s390/zcrypt: Add ZAPQ inline function Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 02/22] s390/zcrypt: Review inline assembler constraints Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 03/22] s390/zcrypt: Show load of cards and queues in sysfs Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 04/22] s390/zcrypt: Integrate ap_asm.h into include/asm/ap.h Tony Krowiak
2018-08-09  9:06   ` Cornelia Huck
2018-08-09  9:17     ` Harald Freudenberger
2018-08-09 13:45       ` Harald Freudenberger
2018-08-09 16:06       ` Tony Krowiak
2018-08-10  8:49         ` Cornelia Huck
2018-08-10  9:37           ` Harald Freudenberger
2018-08-10 15:53             ` Tony Krowiak
2018-08-10 15:50           ` Tony Krowiak
2018-08-09 15:18     ` Tony Krowiak
2018-08-09 15:43       ` Heiko Carstens
2018-08-09 16:55         ` Tony Krowiak
2018-08-13  9:24     ` Harald Freudenberger
2018-08-13  9:34       ` Cornelia Huck
2018-08-08 14:44 ` [PATCH v8 05/22] KVM: s390: vsie: simulate VCPU SIE entry/exit Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 06/22] KVM: s390: introduce and use KVM_REQ_VSIE_RESTART Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 07/22] KVM: s390: refactor crypto initialization Tony Krowiak
2018-08-09  5:58   ` Janosch Frank
2018-08-10 16:13     ` Tony Krowiak
2018-08-09  8:25   ` David Hildenbrand
2018-08-09 19:54     ` Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 08/22] s390: vfio-ap: base implementation of VFIO AP device driver Tony Krowiak
2018-08-09 10:12   ` Cornelia Huck
2018-08-08 14:44 ` [PATCH v8 09/22] s390: vfio-ap: register matrix device with VFIO mdev framework Tony Krowiak
2018-08-09 11:06   ` Cornelia Huck
2018-08-09 16:27     ` Pierre Morel
2018-08-10  8:59       ` Cornelia Huck
2018-08-08 14:44 ` [PATCH v8 10/22] s390: vfio-ap: sysfs interfaces to configure adapters Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 11/22] s390: vfio-ap: sysfs interfaces to configure domains Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 12/22] s390: vfio-ap: sysfs interfaces to configure control domains Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 13/22] s390: vfio-ap: sysfs interface to view matrix mdev matrix Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 14/22] KVM: s390: interfaces to clear CRYCB masks Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 15/22] s390: vfio-ap: implement mediated device open callback Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 16/22] s390: vfio-ap: implement VFIO_DEVICE_GET_INFO ioctl Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 17/22] s390: vfio-ap: zeroize the AP queues Tony Krowiak
2018-08-10  9:14   ` Cornelia Huck
2018-08-10 10:49     ` Pierre Morel
2018-08-10 11:16       ` Cornelia Huck
2018-08-10 16:24         ` Tony Krowiak
2018-08-13  6:57           ` Cornelia Huck
2018-08-08 14:44 ` [PATCH v8 18/22] s390: vfio-ap: implement VFIO_DEVICE_RESET ioctl Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 19/22] KVM: s390: Clear Crypto Control Block when using vSIE Tony Krowiak
2018-08-09  8:10   ` David Hildenbrand
2018-08-09  8:50     ` Pierre Morel
2018-08-09  8:57     ` Pierre Morel
2018-08-08 14:44 ` [PATCH v8 20/22] KVM: s390: Handling of Cypto control block in VSIE Tony Krowiak
2018-08-09  6:20   ` Janosch Frank
2018-08-09  7:33     ` Pierre Morel
2018-08-08 14:44 ` [PATCH v8 21/22] KVM: s390: CPU model support for AP virtualization Tony Krowiak
2018-08-09  8:17   ` David Hildenbrand [this message]
2018-08-09  8:34     ` Harald Freudenberger
2018-08-09 20:27     ` Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 22/22] s390: doc: detailed specifications " Tony Krowiak
2018-08-08 15:06 ` [PATCH v8 00/22] vfio-ap: guest dedicated crypto adapters Janosch Frank
2018-08-08 16:25 ` Cornelia Huck
2018-08-08 22:52   ` Tony Krowiak

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