disabling halt polling broken? (was Re: [PATCH 00/14] KVM: Halt-polling... | linux-arm-kernel

[PATCH 00/14] KVM: Halt-polling fixes, cleanups and a new stat · Sean Christopherson <seanjc@google.com> · 2021-09-25
[PATCH 02/14] KVM: Update halt-polling stats if and only if halt-polling was attempted · Sean Christopherson <seanjc@google.com> · 2021-09-25
Re: [PATCH 02/14] KVM: Update halt-polling stats if and only if halt-polling was attempted · David Matlack <dmatlack@google.com> · 2021-09-28
[PATCH 01/14] KVM: s390: Ensure kvm_arch_no_poll() is read once when blocking vCPU · Sean Christopherson <seanjc@google.com> · 2021-09-25
Re: [PATCH 01/14] KVM: s390: Ensure kvm_arch_no_poll() is read once when blocking vCPU · Christian Borntraeger <hidden> · 2021-09-27
[PATCH 03/14] KVM: Refactor and document halt-polling stats update helper · Sean Christopherson <seanjc@google.com> · 2021-09-25
Re: [PATCH 03/14] KVM: Refactor and document halt-polling stats update helper · David Matlack <dmatlack@google.com> · 2021-09-28
[PATCH 04/14] KVM: Reconcile discrepancies in halt-polling stats · Sean Christopherson <seanjc@google.com> · 2021-09-25
Re: [PATCH 04/14] KVM: Reconcile discrepancies in halt-polling stats · David Matlack <dmatlack@google.com> · 2021-09-28
[PATCH 05/14] KVM: s390: Clear valid_wakeup in kvm_s390_handle_wait(), not in arch hook · Sean Christopherson <seanjc@google.com> · 2021-09-25
Re: [PATCH 05/14] KVM: s390: Clear valid_wakeup in kvm_s390_handle_wait(), not in arch hook · Christian Borntraeger <hidden> · 2021-09-27
[PATCH 06/14] KVM: Drop obsolete kvm_arch_vcpu_block_finish() · Sean Christopherson <seanjc@google.com> · 2021-09-25
Re: [PATCH 06/14] KVM: Drop obsolete kvm_arch_vcpu_block_finish() · Christian Borntraeger <hidden> · 2021-09-27
Re: [PATCH 06/14] KVM: Drop obsolete kvm_arch_vcpu_block_finish() · David Matlack <dmatlack@google.com> · 2021-09-28
[PATCH 07/14] KVM: Don't block+unblock when halt-polling is successful · Sean Christopherson <seanjc@google.com> · 2021-09-25
Re: [PATCH 07/14] KVM: Don't block+unblock when halt-polling is successful · Marc Zyngier <maz@kernel.org> · 2021-09-25
Re: [PATCH 07/14] KVM: Don't block+unblock when halt-polling is successful · Paolo Bonzini <pbonzini@redhat.com> · 2021-09-26
Re: [PATCH 07/14] KVM: Don't block+unblock when halt-polling is successful · Marc Zyngier <maz@kernel.org> · 2021-09-26
Re: [PATCH 07/14] KVM: Don't block+unblock when halt-polling is successful · Sean Christopherson <seanjc@google.com> · 2021-09-27
Re: [PATCH 07/14] KVM: Don't block+unblock when halt-polling is successful · Marc Zyngier <maz@kernel.org> · 2021-09-28
Re: [PATCH 07/14] KVM: Don't block+unblock when halt-polling is successful · Sean Christopherson <seanjc@google.com> · 2021-09-28
Re: [PATCH 07/14] KVM: Don't block+unblock when halt-polling is successful · Marc Zyngier <maz@kernel.org> · 2021-09-30
[PATCH 08/14] KVM: x86: Tweak halt emulation helper names to free up kvm_vcpu_halt() · Sean Christopherson <seanjc@google.com> · 2021-09-25
Re: [PATCH 08/14] KVM: x86: Tweak halt emulation helper names to free up kvm_vcpu_halt() · David Matlack <dmatlack@google.com> · 2021-09-28
[PATCH 09/14] KVM: Rename kvm_vcpu_block() => kvm_vcpu_halt() · Sean Christopherson <seanjc@google.com> · 2021-09-25
Re: [PATCH 09/14] KVM: Rename kvm_vcpu_block() => kvm_vcpu_halt() · Christian Borntraeger <hidden> · 2021-09-27
Re: [PATCH 09/14] KVM: Rename kvm_vcpu_block() => kvm_vcpu_halt() · David Matlack <dmatlack@google.com> · 2021-09-28
[PATCH 10/14] KVM: Split out a kvm_vcpu_block() helper from kvm_vcpu_halt() · Sean Christopherson <seanjc@google.com> · 2021-09-25
Re: [PATCH 10/14] KVM: Split out a kvm_vcpu_block() helper from kvm_vcpu_halt() · Christian Borntraeger <hidden> · 2021-09-27
Re: [PATCH 10/14] KVM: Split out a kvm_vcpu_block() helper from kvm_vcpu_halt() · David Matlack <dmatlack@google.com> · 2021-09-28
[PATCH 11/14] KVM: stats: Add stat to detect if vcpu is currently blocking · Sean Christopherson <seanjc@google.com> · 2021-09-25
Re: [PATCH 11/14] KVM: stats: Add stat to detect if vcpu is currently blocking · David Matlack <dmatlack@google.com> · 2021-09-28
[PATCH 12/14] KVM: Don't redo ktime_get() when calculating halt-polling stop/deadline · Sean Christopherson <seanjc@google.com> · 2021-09-25
Re: [PATCH 12/14] KVM: Don't redo ktime_get() when calculating halt-polling stop/deadline · David Matlack <dmatlack@google.com> · 2021-09-28
[PATCH 13/14] KVM: x86: Directly block (instead of "halting") UNINITIALIZED vCPUs · Sean Christopherson <seanjc@google.com> · 2021-09-25
Re: [PATCH 13/14] KVM: x86: Directly block (instead of "halting") UNINITIALIZED vCPUs · David Matlack <dmatlack@google.com> · 2021-09-28
[PATCH 14/14] KVM: x86: Invoke kvm_vcpu_block() directly for non-HALTED wait states · Sean Christopherson <seanjc@google.com> · 2021-09-25
Re: [PATCH 14/14] KVM: x86: Invoke kvm_vcpu_block() directly for non-HALTED wait states · David Matlack <dmatlack@google.com> · 2021-09-28
disabling halt polling broken? (was Re: [PATCH 00/14] KVM: Halt-polling fixes, cleanups and a new stat) · Christian Borntraeger <hidden> · 2021-09-27
Re: disabling halt polling broken? (was Re: [PATCH 00/14] KVM: Halt-polling fixes, cleanups and a new stat) · Sean Christopherson <seanjc@google.com> · 2021-09-27
Re: disabling halt polling broken? (was Re: [PATCH 00/14] KVM: Halt-polling fixes, cleanups and a new stat) · Paolo Bonzini <pbonzini@redhat.com> · 2021-09-27
Re: disabling halt polling broken? (was Re: [PATCH 00/14] KVM: Halt-polling fixes, cleanups and a new stat) · Sean Christopherson <seanjc@google.com> · 2021-09-27
Re: disabling halt polling broken? (was Re: [PATCH 00/14] KVM: Halt-polling fixes, cleanups and a new stat) · Christian Borntraeger <hidden> · 2021-09-27
Re: disabling halt polling broken? (was Re: [PATCH 00/14] KVM: Halt-polling fixes, cleanups and a new stat) · David Matlack <dmatlack@google.com> · 2021-09-27
Re: disabling halt polling broken? (was Re: [PATCH 00/14] KVM: Halt-polling fixes, cleanups and a new stat) · Christian Borntraeger <hidden> · 2021-09-29
Re: disabling halt polling broken? (was Re: [PATCH 00/14] KVM: Halt-polling fixes, cleanups and a new stat) · Paolo Bonzini <pbonzini@redhat.com> · 2021-09-27
Re: disabling halt polling broken? (was Re: [PATCH 00/14] KVM: Halt-polling fixes, cleanups and a new stat) · Sean Christopherson <seanjc@google.com> · 2021-09-27
Re: disabling halt polling broken? (was Re: [PATCH 00/14] KVM: Halt-polling fixes, cleanups and a new stat) · wangyanan (Y) <hidden> · 2022-11-15
Re: disabling halt polling broken? (was Re: [PATCH 00/14] KVM: Halt-polling fixes, cleanups and a new stat) · David Matlack <dmatlack@google.com> · 2022-11-16
Re: disabling halt polling broken? (was Re: [PATCH 00/14] KVM: Halt-polling fixes, cleanups and a new stat) · wangyanan (Y) <hidden> · 2022-11-18

disabling halt polling broken? (was Re: [PATCH 00/14] KVM: Halt-polling fixes, cleanups and a new stat)

From: Christian Borntraeger <hidden>
Date: 2021-09-27 07:23:51
Also in: kvm, kvmarm, linux-mips, lkml

While looking into this series,

I realized that Davids patch

commit acd05785e48c01edb2c4f4d014d28478b5f19fb5
Author:     David Matlack [off-list ref]
AuthorDate: Fri Apr 17 15:14:46 2020 -0700
Commit:     Paolo Bonzini [off-list ref]
CommitDate: Fri Apr 24 12:53:17 2020 -0400

     kvm: add capability for halt polling

broke the possibility for an admin to disable halt polling for already running KVM guests.
In past times doing
echo 0 > /sys/module/kvm/parameters/halt_poll_ns

stopped polling system wide.
Now all KVM guests will use the halt_poll_ns value that was active during startup - even those that do not use KVM_CAP_HALT_POLL.

I guess this was not intended?

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