From: Gavin Shan <gshan@redhat.com>
To: Eric Auger <eauger@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: Wed, 12 Jan 2022 10:54:18 +0800 [thread overview]
Message-ID: <f2ecad36-ba52-5420-1f7b-d7c099318680@redhat.com> (raw)
In-Reply-To: <0d46c17b-1a37-cbf6-4d34-aa03d30e39ef@redhat.com>
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.
>> + 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:[~2022-01-12 2:54 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 [this message]
2022-01-27 14:13 ` Eric Auger
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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