From: Eric Auger <eauger@redhat.com>
To: Gavin Shan <gshan@redhat.com>, kvmarm@lists.cs.columbia.edu
Cc: maz@kernel.org, linux-kernel@vger.kernel.org,
Jonathan.Cameron@huawei.com, pbonzini@redhat.com,
will@kernel.org
Subject: Re: [PATCH v4 10/21] KVM: arm64: Support SDEI_EVENT_ROUTING_SET hypercall
Date: Thu, 27 Jan 2022 15:13:43 +0100 [thread overview]
Message-ID: <9186a727-afa7-a32c-e46e-580b2bc07ef7@redhat.com> (raw)
In-Reply-To: <f2ecad36-ba52-5420-1f7b-d7c099318680@redhat.com>
Hi Gavin,
On 1/12/22 3:54 AM, Gavin Shan wrote:
> Hi Eric,
>
> On 11/10/21 2:47 AM, Eric Auger wrote:
>> On 8/15/21 2:13 AM, Gavin Shan wrote:
>>> This supports SDEI_EVENT_ROUTING_SET hypercall. It's used by the
>>> guest to set route mode and affinity for the registered KVM event.
>>> It's only valid for the shared events. It's not allowed to do so
>>> when the corresponding event has been raised to the guest.
>>>
>>> Signed-off-by: Gavin Shan <gshan@redhat.com>
>>> ---
>>> arch/arm64/kvm/sdei.c | 64 +++++++++++++++++++++++++++++++++++++++++++
>>> 1 file changed, 64 insertions(+)
>>>
>>> diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
>>> index 5dfa74b093f1..458695c2394f 100644
>>> --- a/arch/arm64/kvm/sdei.c
>>> +++ b/arch/arm64/kvm/sdei.c
>>> @@ -489,6 +489,68 @@ static unsigned long
>>> kvm_sdei_hypercall_info(struct kvm_vcpu *vcpu)
>>> return ret;
>>> }
>>> +static unsigned long kvm_sdei_hypercall_route(struct kvm_vcpu *vcpu)
>>> +{
>>> + struct kvm *kvm = vcpu->kvm;
>>> + struct kvm_sdei_kvm *ksdei = kvm->arch.sdei;
>>> + struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei;
>>> + struct kvm_sdei_event *kse = NULL;
>>> + struct kvm_sdei_kvm_event *kske = NULL;
>>> + unsigned long event_num = smccc_get_arg1(vcpu);
>>> + unsigned long route_mode = smccc_get_arg2(vcpu);
>>> + unsigned long route_affinity = smccc_get_arg3(vcpu);
>>> + int index = 0;
>>> + unsigned long ret = SDEI_SUCCESS;
>>> +
>>> + /* Sanity check */
>>> + if (!(ksdei && vsdei)) {
>>> + ret = SDEI_NOT_SUPPORTED;
>>> + goto out;
>>> + }
>>> +
>>> + if (!kvm_sdei_is_valid_event_num(event_num)) {
>>> + ret = SDEI_INVALID_PARAMETERS;
>>> + goto out;
>>> + }
>>> +
>>> + if (!(route_mode == SDEI_EVENT_REGISTER_RM_ANY ||
>>> + route_mode == SDEI_EVENT_REGISTER_RM_PE)) {
>>> + ret = SDEI_INVALID_PARAMETERS;
>>> + goto out;
>>> + }
>> Some sanity checking on the affinity arg could be made as well according
>> to 5.1.2 affinity desc. The fn shall return INVALID_PARAMETER in case
>> of invalid affinity.
>
> Yep, you're right. I didn't figure out it. I may put a comment here.
> For now, the SDEI client driver in the guest kernel doesn't attempt
> to change the routing mode.
>
> /* FIXME: The affinity should be verified */
>
>>> +
>>> + /* Check if the KVM event has been registered */
>>> + spin_lock(&ksdei->lock);
>>> + kske = kvm_sdei_find_kvm_event(kvm, event_num);
>>> + if (!kske) {
>>> + ret = SDEI_INVALID_PARAMETERS;
>>> + goto unlock;
>>> + }
>>> +
>>> + /* Validate KVM event state */
>>> + kse = kske->kse;
>>> + if (kse->state.type != SDEI_EVENT_TYPE_SHARED) {
>>> + ret = SDEI_INVALID_PARAMETERS;
>>> + goto unlock;
>>> + }
>>> +
>> Event handler is in a state other than: handler-registered.
>
> They're equivalent as the handler is provided as a parameter when
> the event is registered.
>
>>> + if (!kvm_sdei_is_registered(kske, index) ||
>>> + kvm_sdei_is_enabled(kske, index) ||
>>> + kske->state.refcount) {
>> I am not sure about the refcount role here. Does it make sure the state
>> is != handler-enabled and running or handler-unregister-pending?
>>
>> I think we would gain in readibility if we had a helper to check whether
>> we are in those states?
>
> @refcount here indicates pending SDEI event for delivery. In this case,
> chaning its routing mode is disallowed.
OK. I guess you will document the refcount role somewhere.
Thanks
Eric
>
>>> + ret = SDEI_DENIED;
>>> + goto unlock;
>>> + }
>>> +
>>> + /* Update state */
>>> + kske->state.route_mode = route_mode;
>>> + kske->state.route_affinity = route_affinity;
>>> +
>>> +unlock:
>>> + spin_unlock(&ksdei->lock);
>>> +out:
>>> + return ret;
>>> +}
>>> +
>>> int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
>>> {
>>> u32 func = smccc_get_function(vcpu);
>>> @@ -523,6 +585,8 @@ int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
>>> ret = kvm_sdei_hypercall_info(vcpu);
>>> break;
>>> case SDEI_1_0_FN_SDEI_EVENT_ROUTING_SET:
>>> + ret = kvm_sdei_hypercall_route(vcpu);
>>> + break;
>>> case SDEI_1_0_FN_SDEI_PE_MASK:
>>> case SDEI_1_0_FN_SDEI_PE_UNMASK:
>>> case SDEI_1_0_FN_SDEI_INTERRUPT_BIND:
>>>
>
> Thanks,
> Gavin
>
next prev parent reply other threads:[~2022-01-27 14:13 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-15 0:13 [PATCH v4 00/21] Support SDEI Virtualization Gavin Shan
2021-08-15 0:13 ` [PATCH v4 01/21] KVM: arm64: Introduce template for inline functions Gavin Shan
2021-11-09 15:26 ` Eric Auger
2022-01-11 7:52 ` Gavin Shan
2021-08-15 0:13 ` [PATCH v4 02/21] KVM: arm64: Add SDEI virtualization infrastructure Gavin Shan
2021-11-09 15:45 ` Eric Auger
2022-01-11 9:20 ` Gavin Shan
2022-01-27 13:17 ` Eric Auger
2022-01-11 9:40 ` Shannon Zhao
2022-01-13 7:09 ` Gavin Shan
2021-08-15 0:13 ` [PATCH v4 03/21] KVM: arm64: Support SDEI_VERSION hypercall Gavin Shan
2021-11-09 15:26 ` Eric Auger
2022-01-11 9:25 ` Gavin Shan
2021-08-15 0:13 ` [PATCH v4 04/21] KVM: arm64: Support SDEI_EVENT_REGISTER hypercall Gavin Shan
2021-11-09 15:50 ` Eric Auger
2022-01-12 2:19 ` Gavin Shan
2021-08-15 0:13 ` [PATCH v4 05/21] KVM: arm64: Support SDEI_EVENT_{ENABLE, DISABLE} hypercall Gavin Shan
2021-11-09 16:02 ` Eric Auger
2022-01-12 2:29 ` Gavin Shan
2022-01-25 18:23 ` Eric Auger
2021-08-15 0:13 ` [PATCH v4 06/21] KVM: arm64: Support SDEI_EVENT_CONTEXT hypercall Gavin Shan
2021-11-10 11:16 ` Eric Auger
2022-01-12 2:33 ` Gavin Shan
2022-01-25 18:29 ` Eric Auger
2022-01-11 9:43 ` Shannon Zhao
2022-01-13 7:02 ` Gavin Shan
2022-01-13 7:13 ` Gavin Shan
2022-01-25 18:32 ` Eric Auger
2022-01-25 18:31 ` Eric Auger
2021-08-15 0:13 ` [PATCH v4 07/21] KVM: arm64: Support SDEI_EVENT_UNREGISTER hypercall Gavin Shan
2021-11-09 17:05 ` Eric Auger
2022-01-12 2:38 ` Gavin Shan
2022-01-25 18:42 ` Eric Auger
2021-08-15 0:13 ` [PATCH v4 08/21] KVM: arm64: Support SDEI_EVENT_STATUS hypercall Gavin Shan
2021-11-09 17:12 ` Eric Auger
2022-01-12 2:40 ` Gavin Shan
2021-08-15 0:13 ` [PATCH v4 09/21] KVM: arm64: Support SDEI_EVENT_GET_INFO hypercall Gavin Shan
2021-11-09 17:19 ` Eric Auger
2022-01-12 2:46 ` Gavin Shan
2022-01-27 14:19 ` Eric Auger
2021-08-15 0:13 ` [PATCH v4 10/21] KVM: arm64: Support SDEI_EVENT_ROUTING_SET hypercall Gavin Shan
2021-11-09 18:47 ` Eric Auger
2022-01-12 2:54 ` Gavin Shan
2022-01-27 14:13 ` Eric Auger [this message]
2021-08-15 0:13 ` [PATCH v4 11/21] KVM: arm64: Support SDEI_PE_{MASK, UNMASK} hypercall Gavin Shan
2021-11-09 20:31 ` Eric Auger
2022-01-12 2:58 ` Gavin Shan
2021-08-15 0:13 ` [PATCH v4 12/21] KVM: arm64: Support SDEI_{PRIVATE, SHARED}_RESET hypercall Gavin Shan
2021-11-09 20:37 ` Eric Auger
2022-01-12 3:01 ` Gavin Shan
2021-08-15 0:13 ` [PATCH v4 13/21] KVM: arm64: Impment SDEI event delivery Gavin Shan
2021-11-10 10:58 ` Eric Auger
2022-01-12 6:34 ` Gavin Shan
2021-08-15 0:13 ` [PATCH v4 14/21] KVM: arm64: Support SDEI_EVENT_{COMPLETE, COMPLETE_AND_RESUME} hypercall Gavin Shan
2021-11-10 10:58 ` Eric Auger
2022-01-12 6:43 ` Gavin Shan
2022-01-27 14:47 ` Eric Auger
2022-01-27 15:20 ` Eric Auger
2021-08-15 0:13 ` [PATCH v4 15/21] KVM: arm64: Support SDEI event notifier Gavin Shan
2021-11-10 11:35 ` Eric Auger
2022-01-12 6:48 ` Gavin Shan
2021-08-15 0:13 ` [PATCH v4 16/21] KVM: arm64: Support SDEI ioctl commands on VM Gavin Shan
2021-11-10 13:48 ` Eric Auger
2022-01-12 7:03 ` Gavin Shan
2022-01-27 13:48 ` Eric Auger
2021-08-15 0:13 ` [PATCH v4 17/21] KVM: arm64: Support SDEI ioctl commands on vCPU Gavin Shan
2021-08-15 0:13 ` [PATCH v4 18/21] KVM: arm64: Support SDEI event injection Gavin Shan
2021-11-10 14:05 ` Eric Auger
2022-01-12 7:12 ` Gavin Shan
2021-08-15 0:13 ` [PATCH v4 19/21] KVM: arm64: Support SDEI event cancellation Gavin Shan
2021-11-10 14:09 ` Eric Auger
2022-01-12 7:19 ` Gavin Shan
2021-08-15 0:13 ` [PATCH v4 20/21] KVM: arm64: Export SDEI capability Gavin Shan
2021-11-10 13:55 ` Eric Auger
2022-01-12 7:20 ` Gavin Shan
2021-08-15 0:13 ` [PATCH v4 21/21] KVM: selftests: Add SDEI test case Gavin Shan
2021-08-15 0:19 ` [PATCH v4 00/21] Support SDEI Virtualization Gavin Shan
2021-11-10 14:29 ` Eric Auger
2022-01-12 7:24 ` Gavin Shan
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