linux-kernel - Re: [PATCH v3 3/3] KVM: s390: pv: Allow AP-instructions for pv-guests

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Date:   Tue, 15 Aug 2023 14:09:53 +0200
From:   Janosch Frank <frankja@...ux.ibm.com>
To:     Steffen Eiden <seiden@...ux.ibm.com>, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, kvm@...r.kernel.org
Cc:     Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Michael Mueller <mimu@...ux.vnet.ibm.com>,
        Marc Hartmayer <mhartmay@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>
Subject: Re: [PATCH v3 3/3] KVM: s390: pv: Allow AP-instructions for pv-guests

On 8/10/23 13:32, Steffen Eiden wrote:
> Introduces new feature bits and enablement flags for AP and AP IRQ
> support.
> 
> Signed-off-by: Steffen Eiden <seiden@...ux.ibm.com>

Reviewed-by: Janosch Frank <frankja@...ux.ibm.com>

> ---
>   arch/s390/include/asm/uv.h | 12 +++++++++++-
>   arch/s390/kvm/pv.c         |  6 ++++--
>   2 files changed, 15 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/s390/include/asm/uv.h b/arch/s390/include/asm/uv.h
> index f76b2747b648..680654ff6d17 100644
> --- a/arch/s390/include/asm/uv.h
> +++ b/arch/s390/include/asm/uv.h
> @@ -99,6 +99,8 @@ enum uv_cmds_inst {
>   enum uv_feat_ind {
>   	BIT_UV_FEAT_MISC = 0,
>   	BIT_UV_FEAT_AIV = 1,
> +	BIT_UV_FEAT_AP = 4,
> +	BIT_UV_FEAT_AP_INTR = 5,
>   };
>   
>   struct uv_cb_header {
> @@ -159,7 +161,15 @@ struct uv_cb_cgc {
>   	u64 guest_handle;
>   	u64 conf_base_stor_origin;
>   	u64 conf_virt_stor_origin;
> -	u64 reserved30;
> +	u8  reserved30[6];
> +	union {
> +		struct {
> +			u16 : 14;
> +			u16 ap_instr_intr : 1;
> +			u16 ap_allow_instr : 1;
> +		};
> +		u16 raw;
> +	} flags;
>   	u64 guest_stor_origin;
>   	u64 guest_stor_len;
>   	u64 guest_sca;
> diff --git a/arch/s390/kvm/pv.c b/arch/s390/kvm/pv.c
> index 8d3f39a8a11e..bbd3a93db341 100644
> --- a/arch/s390/kvm/pv.c
> +++ b/arch/s390/kvm/pv.c
> @@ -575,12 +575,14 @@ int kvm_s390_pv_init_vm(struct kvm *kvm, u16 *rc, u16 *rrc)
>   	uvcb.conf_base_stor_origin =
>   		virt_to_phys((void *)kvm->arch.pv.stor_base);
>   	uvcb.conf_virt_stor_origin = (u64)kvm->arch.pv.stor_var;
> +	uvcb.flags.ap_allow_instr = kvm->arch.model.uv_feat_guest.ap;
> +	uvcb.flags.ap_instr_intr = kvm->arch.model.uv_feat_guest.ap_intr;
>   
>   	cc = uv_call_sched(0, (u64)&uvcb);
>   	*rc = uvcb.header.rc;
>   	*rrc = uvcb.header.rrc;
> -	KVM_UV_EVENT(kvm, 3, "PROTVIRT CREATE VM: handle %llx len %llx rc %x rrc %x",
> -		     uvcb.guest_handle, uvcb.guest_stor_len, *rc, *rrc);
> +	KVM_UV_EVENT(kvm, 3, "PROTVIRT CREATE VM: handle %llx len %llx rc %x rrc %x flags %04x",
> +		     uvcb.guest_handle, uvcb.guest_stor_len, *rc, *rrc, uvcb.flags.raw);
>   
>   	/* Outputs */
>   	kvm->arch.pv.handle = uvcb.guest_handle;