linux-kernel - Re: [PATCH v8 20/22] KVM: s390: Handling of Cypto control block in VSIE

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Message-Id: <dc8b3e66-9ba4-2b78-1e49-12a35d5d234b@linux.ibm.com>
Date:   Thu, 9 Aug 2018 08:20:28 +0200
From:   Janosch Frank <frankja@...ux.ibm.com>
To:     Tony Krowiak <akrowiak@...ux.vnet.ibm.com>,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     freude@...ibm.com, schwidefsky@...ibm.com,
        heiko.carstens@...ibm.com, borntraeger@...ibm.com,
        cohuck@...hat.com, kwankhede@...dia.com,
        bjsdjshi@...ux.vnet.ibm.com, pbonzini@...hat.com,
        alex.williamson@...hat.com, pmorel@...ux.vnet.ibm.com,
        alifm@...ux.vnet.ibm.com, mjrosato@...ux.vnet.ibm.com,
        jjherne@...ux.vnet.ibm.com, thuth@...hat.com,
        pasic@...ux.vnet.ibm.com, berrange@...hat.com,
        fiuczy@...ux.vnet.ibm.com, buendgen@...ibm.com,
        Pierre Morel <pmorel@...ux.ibm.com>
Subject: Re: [PATCH v8 20/22] KVM: s390: Handling of Cypto control block in
 VSIE

On 08.08.2018 16:44, Tony Krowiak wrote:
> From: Pierre Morel <pmorel@...ux.ibm.com>
> +#define ECA_APIE 0x00000008

That shouldn't be necessary, it's defined in kvm_host.h which vsie.c
includes. Or is it not?

> +static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
> +{
> +	struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
> +	struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
> +	const uint32_t crycbd_o = READ_ONCE(scb_o->crycbd);
> +	const u32 crycb_addr = crycbd_o & 0x7ffffff8U;
> +	int g2_fmt = vcpu->arch.sie_block->crycbd & CRYCB_FORMAT_MASK;
> +	int g3_fmt = crycbd_o & CRYCB_FORMAT_MASK;
> +	int g2_apie, g2_msa3, g3_apie, g3_msa3;
> +	int size, ret;
> +
> +	/* crycb should not cross a page boundary */
> +	size = (g3_fmt == CRYCB_FORMAT2) ? 0x100 : 0x80;
> +	if ((crycb_addr & PAGE_MASK) != ((crycb_addr + size) & PAGE_MASK))
> +		return set_validity_icpt(scb_s, 0x003CU);
> +
> +	g2_apie = vcpu->arch.sie_block->eca & ECA_APIE;
> +	g3_apie = scb_o->eca & g2_apie;
> +
> +	g2_msa3 = test_kvm_facility(vcpu->kvm, 76);
> +	g3_msa3 = (g3_fmt != CRYCB_FORMAT0) & g2_msa3;
> +
> +	scb_s->crycbd = 0;
> +	/* If no AP instructions and no keys we just set crycbd to 0 */
> +	if (!(g3_apie || g3_msa3))
> +		return 0;
> +
> +	if (!crycb_addr)
> +		return set_validity_icpt(scb_s, 0x0039U);
> +
> +	if (g3_apie) {
> +		ret = copy_apcb(vcpu, vsie_page, g2_fmt, g3_fmt);
> +		if (ret)
> +			goto out;

s/goto out;/return ret;/

> +		scb_s->eca |= g3_apie;
> +	}
> +
> +	if (g3_msa3)
> +		ret = copy_key_masks(vcpu, vsie_page);
> +
> +	if (!ret)
> +		scb_s->crycbd = ((__u32)(__u64) &vsie_page->crycb) | g2_fmt;
> +
> +out:
> +	return ret;
> +}
> +
>  /* shadow (round up/down) the ibc to avoid validity icpt */
>  static void prepare_ibc(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
>  {
> 




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