From: Tony Krowiak <akrowiak@linux.ibm.com>
To: Cornelia Huck <cohuck@redhat.com>, Pierre Morel <pmorel@linux.ibm.com>
Cc: Tony Krowiak <akrowiak@linux.vnet.ibm.com>,
linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, freude@de.ibm.com, schwidefsky@de.ibm.com,
heiko.carstens@de.ibm.com, borntraeger@de.ibm.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
Subject: Re: [PATCH v8 17/22] s390: vfio-ap: zeroize the AP queues.
Date: Fri, 10 Aug 2018 12:24:47 -0400 [thread overview]
Message-ID: <14983b58-f53b-8bd9-179e-29b9a69c21d8@linux.ibm.com> (raw)
In-Reply-To: <20180810131648.4fab1d7a.cohuck@redhat.com>
On 08/10/2018 07:16 AM, Cornelia Huck wrote:
> On Fri, 10 Aug 2018 12:49:08 +0200
> Pierre Morel <pmorel@linux.ibm.com> wrote:
>
>> On 10/08/2018 11:14, Cornelia Huck wrote:
>>> On Wed, 8 Aug 2018 10:44:27 -0400
>>> Tony Krowiak <akrowiak@linux.vnet.ibm.com> wrote:
>>>
>>>> From: Tony Krowiak <akrowiak@linux.ibm.com>
>>>>
>>>> Let's call PAPQ(ZAPQ) to zeroize a queue:
>>>>
>>>> * For each queue configured for a mediated matrix device
>>>> when it is released.
>>>>
>>>> Zeroizing a queue resets the queue, clears all pending
>>>> messages for the queue entries and disables adapter interruptions
>>>> associated with the queue.
>>>>
>>>> Signed-off-by: Tony Krowiak <akrowiak@linux.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>
>>>> ---
>>>> drivers/s390/crypto/vfio_ap_ops.c | 29 ++++++++++++++++++++++++++++-
>>>> drivers/s390/crypto/vfio_ap_private.h | 25 +++++++++++++++++++++++++
>>>> 2 files changed, 53 insertions(+), 1 deletions(-)
>>>>
>>>> @@ -788,7 +812,10 @@ static void vfio_ap_mdev_release(struct mdev_device *mdev)
>>>> {
>>>> struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
>>>>
>>>> - kvm_arch_crypto_clear_masks(matrix_mdev->kvm);
>>>> + if (matrix_mdev->kvm)
>>>> + kvm_arch_crypto_clear_masks(matrix_mdev->kvm);
>>> Confused. Why is the check for matrix_mdev->kvm added here?
>> When using the KVM notifier we can get two notifications:
>> -> KVM is here / is comming
>> -> KVM is not here / disappearing
>>
>> In the first case we initialize matrix_mdev->kvm with a pointer to KVM
>> In the second case we nullify the pointer.
>>
>> During the open of the mediated device, the guest should have been started
>> or we refuse to start.
>>
>> During the close of the mediated device, the guest should be there, but
>> we have no certitude that the guest did not disappear before the VFIO
>> file being closed.
>> Since we do not allow multiple guests using the same mediated device
>> this case should not happen with QEMU. But I am not sure that
>> a rogue user program could not stop KVM before closing the VFIO
>> mediated device.
> I'm not sure why the check is introduced in this patch, though. But
> maybe I just need weekend :)
Good catch, it belongs in patch 15 where the function is introduced.
Is that the only reason for your objection?
>
>> Maybe Alex can confirm this point, if not we can remove the test.
next prev parent reply other threads:[~2018-08-10 16:25 UTC|newest]
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 [this message]
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
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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