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From: Tony Krowiak <akrowiak@linux.ibm.com>
To: David Hildenbrand <david@redhat.com>,
	Tony Krowiak <akrowiak@linux.vnet.ibm.com>,
	linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org
Cc: freude@de.ibm.com, schwidefsky@de.ibm.com,
	heiko.carstens@de.ibm.com, borntraeger@de.ibm.com,
	cohuck@redhat.com, kwankhede@nvidia.com,
	bjsdjshi@linux.vnet.ibm.com, pbonzini@redhat.com,
	alex.williamson@redhat.com, pmorel@linux.vnet.ibm.com,
	alifm@linux.vnet.ibm.com, mjrosato@linux.vnet.ibm.com,
	jjherne@linux.vnet.ibm.com, thuth@redhat.com,
	pasic@linux.vnet.ibm.com, berrange@redhat.com,
	fiuczy@linux.vnet.ibm.com, buendgen@de.ibm.com,
	frankja@linux.ibm.com
Subject: Re: [PATCH v8 07/22] KVM: s390: refactor crypto initialization
Date: Thu, 9 Aug 2018 15:54:25 -0400
Message-ID: <6ee73b88-a6ad-1dc2-3f46-eb3278e9d921@linux.ibm.com> (raw)
In-Reply-To: <63a28213-5926-55e5-6d6c-de71a221521b@redhat.com>

On 08/09/2018 04:25 AM, David Hildenbrand wrote:
> On 08.08.2018 16:44, Tony Krowiak wrote:
>> From: Tony Krowiak <akrowiak@linux.ibm.com>
>>
>> This patch refactors the code that initializes and sets up the
>> crypto configuration for a guest. The following changes are
>> implemented via this patch:
>>
>> 1. Prior to the introduction of AP device virtualization, it
>>     was not necessary to provide guest access to the CRYCB
>>     unless the MSA extension 3 (MSAX3) facility was installed
>>     on the host system. With the introduction of AP device
>>     virtualization, the CRYCB must be made accessible to the
>>     guest if the AP instructions are installed on the host
>>     and are to be provided to the guest.
>>
>> 2. Introduces a flag indicating AP instructions executed on
>>     the guest shall be interpreted by the firmware. It is
>>     initialized to indicate AP instructions are to be
>>     to be interpreted and is used to set the SIE bit for
>>     each vcpu during vcpu setup.
>>
>> Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
>> Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
>> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
>> Tested-by: Michael Mueller <mimu@linux.ibm.com>
>> Tested-by: Farhan Ali <alifm@linux.ibm.com>
>> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
>> ---
>>   arch/s390/include/asm/kvm_host.h |    3 +
>>   arch/s390/include/uapi/asm/kvm.h |    1 +
>>   arch/s390/kvm/kvm-s390.c         |   86 ++++++++++++++++++++------------------
>>   3 files changed, 49 insertions(+), 41 deletions(-)
>>
>> diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
>> index af39561..0c13f61 100644
>> --- a/arch/s390/include/asm/kvm_host.h
>> +++ b/arch/s390/include/asm/kvm_host.h
>> @@ -187,6 +187,7 @@ struct kvm_s390_sie_block {
>>   #define ECA_AIV		0x00200000
>>   #define ECA_VX		0x00020000
>>   #define ECA_PROTEXCI	0x00002000
>> +#define ECA_APIE	0x00000008
>>   #define ECA_SII		0x00000001
>>   	__u32	eca;			/* 0x004c */
>>   #define ICPT_INST	0x04
>> @@ -256,6 +257,7 @@ struct kvm_s390_sie_block {
>>   	__u8	reservede4[4];		/* 0x00e4 */
>>   	__u64	tecmc;			/* 0x00e8 */
>>   	__u8	reservedf0[12];		/* 0x00f0 */
>> +#define CRYCB_FORMAT_MASK 0x00000003
>>   #define CRYCB_FORMAT1 0x00000001
>>   #define CRYCB_FORMAT2 0x00000003
>>   	__u32	crycbd;			/* 0x00fc */
>> @@ -714,6 +716,7 @@ struct kvm_s390_crypto {
>>   	__u32 crycbd;
>>   	__u8 aes_kw;
>>   	__u8 dea_kw;
>> +	__u8 apie;
>
> This flag is essentially always 1 as far as I can see, so please drop it
> for now. (can be introduced when really needed)

That would appear to be true, so it probably makes sense to drop it.

>
>>   };
>>   
>>   #define APCB0_MASK_SIZE 1
>> diff --git a/arch/s390/include/uapi/asm/kvm.h b/arch/s390/include/uapi/asm/kvm.h
>> index 4cdaa55..a580dec 100644
>> --- a/arch/s390/include/uapi/asm/kvm.h
>> +++ b/arch/s390/include/uapi/asm/kvm.h
>> @@ -130,6 +130,7 @@ struct kvm_s390_vm_cpu_machine {
>>   #define KVM_S390_VM_CPU_FEAT_PFMFI	11
>>   #define KVM_S390_VM_CPU_FEAT_SIGPIF	12
>>   #define KVM_S390_VM_CPU_FEAT_KSS	13
>> +#define KVM_S390_VM_CPU_FEAT_AP		14
>>   struct kvm_s390_vm_cpu_feat {
>>   	__u64 feat[16];
>>   };
>> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
>> index 19f4f44..f96a443 100644
>> --- a/arch/s390/kvm/kvm-s390.c
>> +++ b/arch/s390/kvm/kvm-s390.c
>> @@ -40,6 +40,7 @@
>>   #include <asm/sclp.h>
>>   #include <asm/cpacf.h>
>>   #include <asm/timex.h>
>> +#include <asm/ap.h>
>>   #include "kvm-s390.h"
>>   #include "gaccess.h"
>>   
>> @@ -1881,49 +1882,37 @@ long kvm_arch_vm_ioctl(struct file *filp,
>>   	return r;
>>   }
>>   
>> -static int kvm_s390_query_ap_config(u8 *config)
>> -{
>> -	u32 fcn_code = 0x04000000UL;
>> -	u32 cc = 0;
>> -
>> -	memset(config, 0, 128);
>> -	asm volatile(
>> -		"lgr 0,%1\n"
>> -		"lgr 2,%2\n"
>> -		".long 0xb2af0000\n"		/* PQAP(QCI) */
>> -		"0: ipm %0\n"
>> -		"srl %0,28\n"
>> -		"1:\n"
>> -		EX_TABLE(0b, 1b)
>> -		: "+r" (cc)
>> -		: "r" (fcn_code), "r" (config)
>> -		: "cc", "0", "2", "memory"
>> -	);
>> -
>> -	return cc;
>> -}
>> -
>>   static int kvm_s390_apxa_installed(void)
>>   {
>> -	u8 config[128];
>> -	int cc;
>> +	struct ap_config_info info;
>>   
>> -	if (test_facility(12)) {
>> -		cc = kvm_s390_query_ap_config(config);
>> -
>> -		if (cc)
>> -			pr_err("PQAP(QCI) failed with cc=%d", cc);
>> -		else
>> -			return config[0] & 0x40;
>> +	if (ap_instructions_available() == 0) {
>> +		if (ap_qci(&info) == 0)
>> +			return info.apxa;
>>   	}
>>   
>>   	return 0;
>>   }
>>   
>> +/*
>> + * The format of the crypto control block (CRYCB) is specified in the 3 low
>> + * order bits of the CRYCB designation (CRYCBD) field as follows:
>> + * Format 0: Neither the message security assist extension 3 (MSAX3) nor the
>> + *	     AP extended addressing (APXA) facility are installed.
>> + * Format 1: The APXA facility is not installed but the MSAX3 facility is.
>> + * Format 2: Both the APXA and MSAX3 facilities are installed
>> + */
>>   static void kvm_s390_set_crycb_format(struct kvm *kvm)
>>   {
>>   	kvm->arch.crypto.crycbd = (__u32)(unsigned long) kvm->arch.crypto.crycb;
>>   
>> +	/* Clear the CRYCB format bits - i.e., set format 0 by default */
>> +	kvm->arch.crypto.crycbd &= ~(CRYCB_FORMAT_MASK);
>> +
>> +	/* Check whether MSAX3 is installed */
>> +	if (!test_kvm_facility(kvm, 76))
>> +		return;
>> +
>>   	if (kvm_s390_apxa_installed())
>>   		kvm->arch.crypto.crycbd |= CRYCB_FORMAT2;
>>   	else
>> @@ -1941,11 +1930,13 @@ static u64 kvm_s390_get_initial_cpuid(void)
>>   
>>   static void kvm_s390_crypto_init(struct kvm *kvm)
>>   {
>> -	if (!test_kvm_facility(kvm, 76))
>> -		return;
>> -
>>   	kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb;
>>   	kvm_s390_set_crycb_format(kvm);
>> +	/* Default setting indicating SIE shall interpret AP instructions */
>> +	kvm->arch.crypto.apie = 1;
>> +
>> +	if (!test_kvm_facility(kvm, 76))
>> +		return;
>>   
>>   	/* Enable AES/DEA protected key functions by default */
>>   	kvm->arch.crypto.aes_kw = 1;
>> @@ -2474,17 +2465,30 @@ void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
>>   
>>   static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
>>   {
>> -	if (!test_kvm_facility(vcpu->kvm, 76))
>> +	/*
>> +	 * If neither the AP instructions nor the MSAX3 facility are installed
>> +	 * on the host, then there is no need for a CRYCB in SIE because the
>> +	 * they will not be installed on the guest either.
>> +	 */
>> +	if (ap_instructions_available() && !test_facility(76))
> Why not turn this into
>
> if (!test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_AP) &&
>      !test_kvm_facility(vcpu->kvm, 76))
>
> These properties should no longer change at this point. And we simulate
> exactly what the guest will see. No crycb needed. And even no comment
> needed.

That sounds reasonable, I will make the change.

>
>
>>   		return;
>>   
>> -	vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA);
>> +	vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd;
>> +
>> +	vcpu->arch.sie_block->eca &= ~ECA_APIE;
>> +	if (vcpu->kvm->arch.crypto.apie &&
>> +	    test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_AP))
>> +		vcpu->arch.sie_block->eca |= ECA_APIE;
>>   
>> -	if (vcpu->kvm->arch.crypto.aes_kw)
>> -		vcpu->arch.sie_block->ecb3 |= ECB3_AES;
>> -	if (vcpu->kvm->arch.crypto.dea_kw)
>> -		vcpu->arch.sie_block->ecb3 |= ECB3_DEA;
>> +	/* If MSAX3 is installed on the guest, set up protected key support */
>> +	if (test_kvm_facility(vcpu->kvm, 76)) {
>> +		vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA);
> Why not keep the original unconditional clearing?

No good reason that I can think of ... I'll restore that.

>
>>   
>> -	vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd;
>> +		if (vcpu->kvm->arch.crypto.aes_kw)
>> +			vcpu->arch.sie_block->ecb3 |= ECB3_AES;
>> +		if (vcpu->kvm->arch.crypto.dea_kw)
>> +			vcpu->arch.sie_block->ecb3 |= ECB3_DEA;
>> +	}
>>   }
>>   
>>   void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu)
>>
>


  reply index

Thread overview: 60+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-08 14:44 [PATCH v8 00/22] vfio-ap: guest dedicated crypto adapters Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 01/22] s390/zcrypt: Add ZAPQ inline function Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 02/22] s390/zcrypt: Review inline assembler constraints Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 03/22] s390/zcrypt: Show load of cards and queues in sysfs Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 04/22] s390/zcrypt: Integrate ap_asm.h into include/asm/ap.h Tony Krowiak
2018-08-09  9:06   ` Cornelia Huck
2018-08-09  9:17     ` Harald Freudenberger
2018-08-09 13:45       ` Harald Freudenberger
2018-08-09 16:06       ` Tony Krowiak
2018-08-10  8:49         ` Cornelia Huck
2018-08-10  9:37           ` Harald Freudenberger
2018-08-10 15:53             ` Tony Krowiak
2018-08-10 15:50           ` Tony Krowiak
2018-08-09 15:18     ` Tony Krowiak
2018-08-09 15:43       ` Heiko Carstens
2018-08-09 16:55         ` Tony Krowiak
2018-08-13  9:24     ` Harald Freudenberger
2018-08-13  9:34       ` Cornelia Huck
2018-08-08 14:44 ` [PATCH v8 05/22] KVM: s390: vsie: simulate VCPU SIE entry/exit Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 06/22] KVM: s390: introduce and use KVM_REQ_VSIE_RESTART Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 07/22] KVM: s390: refactor crypto initialization Tony Krowiak
2018-08-09  5:58   ` Janosch Frank
2018-08-10 16:13     ` Tony Krowiak
2018-08-09  8:25   ` David Hildenbrand
2018-08-09 19:54     ` Tony Krowiak [this message]
2018-08-08 14:44 ` [PATCH v8 08/22] s390: vfio-ap: base implementation of VFIO AP device driver Tony Krowiak
2018-08-09 10:12   ` Cornelia Huck
2018-08-08 14:44 ` [PATCH v8 09/22] s390: vfio-ap: register matrix device with VFIO mdev framework Tony Krowiak
2018-08-09 11:06   ` Cornelia Huck
2018-08-09 16:27     ` Pierre Morel
2018-08-10  8:59       ` Cornelia Huck
2018-08-08 14:44 ` [PATCH v8 10/22] s390: vfio-ap: sysfs interfaces to configure adapters Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 11/22] s390: vfio-ap: sysfs interfaces to configure domains Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 12/22] s390: vfio-ap: sysfs interfaces to configure control domains Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 13/22] s390: vfio-ap: sysfs interface to view matrix mdev matrix Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 14/22] KVM: s390: interfaces to clear CRYCB masks Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 15/22] s390: vfio-ap: implement mediated device open callback Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 16/22] s390: vfio-ap: implement VFIO_DEVICE_GET_INFO ioctl Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 17/22] s390: vfio-ap: zeroize the AP queues Tony Krowiak
2018-08-10  9:14   ` Cornelia Huck
2018-08-10 10:49     ` Pierre Morel
2018-08-10 11:16       ` Cornelia Huck
2018-08-10 16:24         ` Tony Krowiak
2018-08-13  6:57           ` Cornelia Huck
2018-08-08 14:44 ` [PATCH v8 18/22] s390: vfio-ap: implement VFIO_DEVICE_RESET ioctl Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 19/22] KVM: s390: Clear Crypto Control Block when using vSIE Tony Krowiak
2018-08-09  8:10   ` David Hildenbrand
2018-08-09  8:50     ` Pierre Morel
2018-08-09  8:57     ` Pierre Morel
2018-08-08 14:44 ` [PATCH v8 20/22] KVM: s390: Handling of Cypto control block in VSIE Tony Krowiak
2018-08-09  6:20   ` Janosch Frank
2018-08-09  7:33     ` Pierre Morel
2018-08-08 14:44 ` [PATCH v8 21/22] KVM: s390: CPU model support for AP virtualization Tony Krowiak
2018-08-09  8:17   ` David Hildenbrand
2018-08-09  8:34     ` Harald Freudenberger
2018-08-09 20:27     ` Tony Krowiak
2018-08-08 14:44 ` [PATCH v8 22/22] s390: doc: detailed specifications " Tony Krowiak
2018-08-08 15:06 ` [PATCH v8 00/22] vfio-ap: guest dedicated crypto adapters Janosch Frank
2018-08-08 16:25 ` Cornelia Huck
2018-08-08 22:52   ` Tony Krowiak

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