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From: Christian Borntraeger <borntraeger@de.ibm.com>
To: Cornelia Huck <cohuck@redhat.com>
Cc: "Janosch Frank" <frankja@linux.ibm.com>,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Radim Krčmář" <rkrcmar@redhat.com>,
	"Thomas Huth" <thuth@redhat.com>,
	kvm@vger.kernel.org, "Shuah Khan" <shuah@kernel.org>,
	"David Hildenbrand" <david@redhat.com>,
	"Andrew Jones" <drjones@redhat.com>,
	linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
	linux-s390@vger.kernel.org
Subject: Re:  Re: [PATCH 8/9] KVM: s390: Do not report unusabled IDs via KVM_CAP_MAX_VCPU_ID
Date: Tue, 28 May 2019 15:48:57 +0200	[thread overview]
Message-ID: <dc8ad44b-3019-bdb2-7991-2ab9a0f1b149@de.ibm.com> (raw)
In-Reply-To: <20190528145344.42fe6bc5.cohuck@redhat.com>



On 28.05.19 14:53, Cornelia Huck wrote:
> On Tue, 28 May 2019 13:00:30 +0200
> Christian Borntraeger <borntraeger@de.ibm.com> wrote:
> 
>> Paolo, Radim,
>>
>> would you consider this patch (or the full series) as 5.2 material or 5.3 material?
> 
> FWIW, I'd consider this patch 5.2 material, as we're currently relaying
> wrong values to userspace.

Agreed. I will add cc stable and queue for master. What is our opinion about kselftest?
Are we merging testtools changes also only during the merge window?
> 
>>
>>
>> On 23.05.19 18:43, Thomas Huth wrote:
>>> KVM_CAP_MAX_VCPU_ID is currently always reporting KVM_MAX_VCPU_ID on all
>>> architectures. However, on s390x, the amount of usable CPUs is determined
>>> during runtime - it is depending on the features of the machine the code
>>> is running on. Since we are using the vcpu_id as an index into the SCA
>>> structures that are defined by the hardware (see e.g. the sca_add_vcpu()
>>> function), it is not only the amount of CPUs that is limited by the hard-
>>> ware, but also the range of IDs that we can use.
>>> Thus KVM_CAP_MAX_VCPU_ID must be determined during runtime on s390x, too.
>>> So the handling of KVM_CAP_MAX_VCPU_ID has to be moved from the common
>>> code into the architecture specific code, and on s390x we have to return
>>> the same value here as for KVM_CAP_MAX_VCPUS.
>>> This problem has been discovered with the kvm_create_max_vcpus selftest.
>>> With this change applied, the selftest now passes on s390x, too.
>>>
>>> Signed-off-by: Thomas Huth <thuth@redhat.com>
>>> ---
>>>  arch/mips/kvm/mips.c       | 3 +++
>>>  arch/powerpc/kvm/powerpc.c | 3 +++
>>>  arch/s390/kvm/kvm-s390.c   | 1 +
>>>  arch/x86/kvm/x86.c         | 3 +++
>>>  virt/kvm/arm/arm.c         | 3 +++
>>>  virt/kvm/kvm_main.c        | 2 --
>>>  6 files changed, 13 insertions(+), 2 deletions(-)
> 


  reply	other threads:[~2019-05-28 13:49 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-23 16:43 [PATCH v1 0/9] KVM selftests for s390x Thomas Huth
2019-05-23 16:43 ` [PATCH 1/9] KVM: selftests: Wrap vcpu_nested_state_get/set functions with x86 guard Thomas Huth
2019-05-23 16:43 ` [PATCH 2/9] KVM: selftests: Guard struct kvm_vcpu_events with __KVM_HAVE_VCPU_EVENTS Thomas Huth
2019-05-23 17:57   ` Andrew Jones
2019-05-23 16:43 ` [PATCH 3/9] kvm: selftests: aarch64: fix default vm mode Thomas Huth
2019-05-24  8:37   ` Christian Borntraeger
2019-05-23 16:43 ` [PATCH 4/9] KVM: selftests: Introduce a VM_MODE_DEFAULT macro for the default bits Thomas Huth
2019-05-23 17:20   ` Andrew Jones
2019-05-23 16:43 ` [PATCH 5/9] KVM: selftests: Align memory region addresses to 1M on s390x Thomas Huth
2019-05-23 17:40   ` Andrew Jones
2019-05-24  8:29     ` Christian Borntraeger
2019-05-24 18:17       ` Thomas Huth
2019-05-23 16:43 ` [PATCH 6/9] KVM: selftests: Add processor code for s390x Thomas Huth
2019-05-23 16:43 ` [PATCH 7/9] KVM: selftests: Add the sync_regs test " Thomas Huth
2019-05-23 16:43 ` [PATCH 8/9] KVM: s390: Do not report unusabled IDs via KVM_CAP_MAX_VCPU_ID Thomas Huth
2019-05-23 17:56   ` Andrew Jones
2019-05-24  9:13   ` Cornelia Huck
2019-05-24  9:16   ` David Hildenbrand
2019-05-28 11:00   ` Christian Borntraeger
2019-05-28 12:53     ` Cornelia Huck
2019-05-28 13:48       ` Christian Borntraeger [this message]
2019-05-23 16:43 ` [PATCH 9/9] KVM: selftests: Move kvm_create_max_vcpus test to generic code Thomas Huth
2019-05-23 17:56   ` Andrew Jones
2019-05-24  9:16   ` David Hildenbrand
2019-05-24 11:11 ` [PATCH v1 0/9] KVM selftests for s390x Christian Borntraeger
2019-05-24 12:17   ` Christian Borntraeger
2019-05-24 12:29     ` Christian Borntraeger
2019-05-24 12:36       ` David Hildenbrand
2019-05-24 12:56         ` Christian Borntraeger
2019-05-24 18:33 ` Christian Borntraeger
2019-06-04 17:19 ` Paolo Bonzini
2019-06-04 17:37   ` Christian Borntraeger

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