linux-kernel - Re: [PATCH v6 15/18] KVM: arm64: Support SDEI

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Message-ID: <Ym4uyaGGhPXlnkHQ@google.com>
Date:   Sun, 1 May 2022 06:55:05 +0000
From:   Oliver Upton <oupton@...gle.com>
To:     Gavin Shan <gshan@...hat.com>
Cc:     kvmarm@...ts.cs.columbia.edu, linux-kernel@...r.kernel.org,
        eauger@...hat.com, Jonathan.Cameron@...wei.com,
        vkuznets@...hat.com, will@...nel.org, shannon.zhaosl@...il.com,
        james.morse@....com, mark.rutland@....com, maz@...nel.org,
        pbonzini@...hat.com, shan.gavin@...il.com
Subject: Re: [PATCH v6 15/18] KVM: arm64: Support SDEI_FEATURES hypercall

On Sun, Apr 03, 2022 at 11:39:08PM +0800, Gavin Shan wrote:
> This supports SDEI_FEATURES hypercall. It's used by guest to
> retrieve the supported features, which are number of slots for
> the interrupt binding events and relative mode for the event
> handler. Currently, none of them is supported.
> 
> Signed-off-by: Gavin Shan <gshan@...hat.com>
> ---
>  arch/arm64/kvm/sdei.c | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c
> index e1f6ab9800ee..ab0b7b5e3191 100644
> --- a/arch/arm64/kvm/sdei.c
> +++ b/arch/arm64/kvm/sdei.c
> @@ -527,6 +527,23 @@ static unsigned long hypercall_reset(struct kvm_vcpu *vcpu, bool private)
>  	return ret;
>  }
>  
> +static unsigned long hypercall_features(struct kvm_vcpu *vcpu)
> +{
> +	unsigned long feature = smccc_get_arg(vcpu, 1);
> +	unsigned long ret;
> +
> +	switch (feature) {
> +	case 0: /* BIND_SLOTS */
> +	case 1: /* RELATIVE_MODE */

Can you create macros for these?

--
Thanks,
Oliver