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 06/21] KVM: arm64: Support SDEI_EVENT_CONTEXT hypercall
Date: Wed, 10 Nov 2021 12:16:34 +0100 [thread overview]
Message-ID: <d9471e38-1840-1f79-c028-8f78afc0d2c7@redhat.com> (raw)
In-Reply-To: <20210815001352.81927-7-gshan@redhat.com>
Hi Gavin,
On 8/15/21 2:13 AM, Gavin Shan wrote:
> This supports SDEI_EVENT_CONTEXT hypercall. It's used by the guest
> to retrieved the original registers (R0 - R17) in its SDEI event
> handler. Those registers can be corrupted during the SDEI event
> delivery.
>
> Signed-off-by: Gavin Shan <gshan@redhat.com>
> ---
> arch/arm64/kvm/sdei.c | 40 ++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 40 insertions(+)
>
> diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
> index b022ce0a202b..b4162efda470 100644
> --- a/arch/arm64/kvm/sdei.c
> +++ b/arch/arm64/kvm/sdei.c
> @@ -270,6 +270,44 @@ static unsigned long kvm_sdei_hypercall_enable(struct kvm_vcpu *vcpu,
> return ret;
> }
>
> +static unsigned long kvm_sdei_hypercall_context(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_vcpu_regs *regs;
> + unsigned long index = smccc_get_arg1(vcpu);
s/index/param_id to match the spec?
> + unsigned long ret = SDEI_SUCCESS;
> +
> + /* Sanity check */
> + if (!(ksdei && vsdei)) {
> + ret = SDEI_NOT_SUPPORTED;
> + goto out;
> + }
> +
> + if (index > ARRAY_SIZE(vsdei->state.critical_regs.regs)) {
> + ret = SDEI_INVALID_PARAMETERS;
> + goto out;
> + }
I would move the above after regs = and use regs there (although the
regs ARRAY_SIZE of both is identifical)
> +
> + /* Check if the pending event exists */
> + spin_lock(&vsdei->lock);
> + if (!(vsdei->critical_event || vsdei->normal_event)) {
> + ret = SDEI_DENIED;
> + goto unlock;
> + }
> +
> + /* Fetch the requested register */
> + regs = vsdei->critical_event ? &vsdei->state.critical_regs :
> + &vsdei->state.normal_regs;
> + ret = regs->regs[index];
> +
> +unlock:
> + spin_unlock(&vsdei->lock);
> +out:
> + return ret;
> +}
> +
> int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
> {
> u32 func = smccc_get_function(vcpu);
> @@ -290,6 +328,8 @@ int kvm_sdei_hypercall(struct kvm_vcpu *vcpu)
> ret = kvm_sdei_hypercall_enable(vcpu, false);
> break;
> case SDEI_1_0_FN_SDEI_EVENT_CONTEXT:
> + ret = kvm_sdei_hypercall_context(vcpu);
> + break;
> case SDEI_1_0_FN_SDEI_EVENT_COMPLETE:
> case SDEI_1_0_FN_SDEI_EVENT_COMPLETE_AND_RESUME:
> case SDEI_1_0_FN_SDEI_EVENT_UNREGISTER:
>
Eric
next prev parent reply other threads:[~2021-11-10 11:16 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 [this message]
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
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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