From: Cornelia Huck <cornelia.huck@de.ibm.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
Christian Borntraeger <christian.borntraeger@de.ibm.com>
Subject: Re: [PATCH 3/3] KVM: s390: use kvm->created_vcpus
Date: Mon, 13 Jun 2016 16:36:14 +0200 [thread overview]
Message-ID: <20160613163614.25256af8.cornelia.huck@de.ibm.com> (raw)
In-Reply-To: <1465824332-10628-4-git-send-email-pbonzini@redhat.com>
On Mon, 13 Jun 2016 15:25:32 +0200
Paolo Bonzini <pbonzini@redhat.com> wrote:
> The new created_vcpus field avoids possible races between enabling
> capabilities and creating VCPUs.
>
> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
> ---
> arch/s390/kvm/kvm-s390.c | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
>
> @@ -426,7 +426,7 @@ static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *att
> ret = -EBUSY;
> VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support");
> mutex_lock(&kvm->lock);
> - if (atomic_read(&kvm->online_vcpus) == 0) {
> + if (kvm->created_vcpus) {
if (!kvm->created_vcpus) {
> kvm->arch.use_cmma = 1;
> ret = 0;
> }
> @@ -467,7 +467,7 @@ static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *att
>
> ret = -EBUSY;
> mutex_lock(&kvm->lock);
> - if (atomic_read(&kvm->online_vcpus) == 0) {
> + if (kvm->created_vcpus) {
dito
> /* gmap_alloc will round the limit up */
> struct gmap *new = gmap_alloc(current->mm, new_limit);
>
next prev parent reply other threads:[~2016-06-13 14:36 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-13 13:25 [PATCH 0/3] KVM: do not use kvm->online_vcpus to check "has one VCPU been created?" Paolo Bonzini
2016-06-13 13:25 ` [PATCH 1/3] KVM: introduce kvm->created_vcpus Paolo Bonzini
2016-06-13 14:43 ` Cornelia Huck
2016-06-13 13:25 ` [PATCH 2/3] KVM: remove kvm_vcpu_compatible Paolo Bonzini
2016-06-13 13:25 ` [PATCH 3/3] KVM: s390: use kvm->created_vcpus Paolo Bonzini
2016-06-13 14:36 ` Cornelia Huck [this message]
2016-06-13 13:33 ` [PATCH 0/3] KVM: do not use kvm->online_vcpus to check "has one VCPU been created?" Christian Borntraeger
2016-06-13 14:44 ` Cornelia Huck
2016-06-15 22:00 ` Paolo Bonzini
2016-06-16 7:30 ` Christian Borntraeger
2016-06-16 7:59 ` Cornelia Huck
2016-06-16 8:23 ` Paolo Bonzini
2016-06-16 8:07 ` Paolo Bonzini
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