From: Christian Borntraeger <borntraeger@de.ibm.com>
To: Halil Pasic <pasic@linux.ibm.com>,
Janosch Frank <frankja@linux.ibm.com>,
Michael Mueller <mimu@linux.ibm.com>,
linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: David Hildenbrand <david@redhat.com>,
Claudio Imbrenda <imbrenda@linux.ibm.com>,
Heiko Carstens <hca@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Pierre Morel <pmorel@linux.ibm.com>,
Tony Krowiak <akrowiak@linux.ibm.com>,
Matthew Rosato <mjrosato@linux.ibm.com>,
Niklas Schnelle <schnelle@linux.ibm.com>,
farman@linux.ibm.com, kvm@vger.kernel.org
Subject: Re: [PATCH 2/3] KVM: s390: preserve deliverable_mask in __airqs_kick_single_vcpu
Date: Tue, 19 Oct 2021 23:24:34 +0200 [thread overview]
Message-ID: <e8faa255-5157-4afb-b79f-710c961ef159@de.ibm.com> (raw)
In-Reply-To: <20211019175401.3757927-3-pasic@linux.ibm.com>
Am 19.10.21 um 19:54 schrieb Halil Pasic:
> Changing the deliverable mask in __airqs_kick_single_vcpu() is a bug. If
> one idle vcpu can't take the interrupts we want to deliver, we should
> look for another vcpu that can, instead of saying that we don't want
> to deliver these interrupts by clearing the bits from the
> deliverable_mask.
>
> Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
> Fixes: 9f30f6216378 ("KVM: s390: add gib_alert_irq_handler()")
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
> ---
> arch/s390/kvm/interrupt.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
> index 10722455fd02..2245f4b8d362 100644
> --- a/arch/s390/kvm/interrupt.c
> +++ b/arch/s390/kvm/interrupt.c
> @@ -3053,13 +3053,14 @@ static void __airqs_kick_single_vcpu(struct kvm *kvm, u8 deliverable_mask)
> int vcpu_idx, online_vcpus = atomic_read(&kvm->online_vcpus);
> struct kvm_s390_gisa_interrupt *gi = &kvm->arch.gisa_int;
> struct kvm_vcpu *vcpu;
> + u8 vcpu_isc_mask;
>
> for_each_set_bit(vcpu_idx, kvm->arch.idle_mask, online_vcpus) {
> vcpu = kvm_get_vcpu(kvm, vcpu_idx);
> if (psw_ioint_disabled(vcpu))
> continue;
> - deliverable_mask &= (u8)(vcpu->arch.sie_block->gcr[6] >> 24);
> - if (deliverable_mask) {
> + vcpu_isc_mask = (u8)(vcpu->arch.sie_block->gcr[6] >> 24);
> + if (deliverable_mask & vcpu_isc_mask) {
> /* lately kicked but not yet running */
> if (test_and_set_bit(vcpu_idx, gi->kicked_mask))
> return;
>
next prev parent reply other threads:[~2021-10-19 21:24 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-19 17:53 [PATCH 0/3] fixes for __airqs_kick_single_vcpu() Halil Pasic
2021-10-19 17:53 ` [PATCH 1/3] KVM: s390: clear kicked_mask before sleeping again Halil Pasic
2021-10-19 21:22 ` Christian Borntraeger
2021-10-20 5:35 ` Claudio Imbrenda
2021-10-20 6:03 ` Christian Borntraeger
2021-10-20 6:08 ` Claudio Imbrenda
2021-10-20 8:14 ` Halil Pasic
2021-10-20 10:42 ` Claudio Imbrenda
2021-10-20 8:06 ` Michael Mueller
2021-10-20 10:44 ` Claudio Imbrenda
2021-10-19 17:54 ` [PATCH 2/3] KVM: s390: preserve deliverable_mask in __airqs_kick_single_vcpu Halil Pasic
2021-10-19 21:24 ` Christian Borntraeger [this message]
2021-10-20 5:39 ` Claudio Imbrenda
2021-10-20 8:08 ` Michael Mueller
2021-10-19 17:54 ` [PATCH 3/3] KVM: s390: clear kicked_mask if not idle after set Halil Pasic
2021-10-19 21:35 ` Christian Borntraeger
2021-10-20 5:14 ` Christian Borntraeger
2021-10-20 7:52 ` Halil Pasic
2021-10-26 8:52 ` Christian Borntraeger
2021-10-20 9:48 ` Michael Mueller
2021-10-20 10:31 ` Christian Borntraeger
2021-10-20 10:45 ` Halil Pasic
2021-10-20 10:52 ` Christian Borntraeger
2021-10-20 10:51 ` Michael Mueller
2021-10-20 11:04 ` [PATCH 0/3] fixes for __airqs_kick_single_vcpu() Christian Borntraeger
2021-10-20 12:12 ` Halil Pasic
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