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SubjectRe: [PATCH v3 01/14] KVM: s390: refactor crypto initialization
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On 14/03/2018 19:25, Tony Krowiak wrote:
> This patch refactors the code that initializes the crypto
> configuration for a guest. The crypto configuration is contained in
> a crypto control block (CRYCB) which is a satellite control block to
> our main hardware virtualization control block. The CRYCB is
> attached to the main virtualization control block via a CRYCB
> designation (CRYCBD) designation field containing the address of
> the CRYCB as well as its format.
>
> Prior to the introduction of AP device virtualization, there was
> no need to provide access to or specify the format of the CRYCB for
> a guest unless the MSA extension 3 (MSAX3) facility was installed
> on the host system. With the introduction of AP device virtualization,
> the CRYCB and its format must be made accessible to the guest
> regardless of the presence of the MSAX3 facility.
>
> The crypto initialization code is restructured as follows:
>
> * A new compilation unit is introduced to contain all interfaces
> and data structures related to configuring a guest's CRYCB for
> both the refactoring of crypto initialization as well as all
> subsequent patches introducing AP virtualization support.
>
> * Currently, the asm code for querying the AP configuration is
> duplicated in the AP bus as well as in KVM. Since the KVM
> code was introduced, the AP bus has externalized the interface
> for querying the AP configuration. The KVM interface will be
> replaced with a call to the AP bus interface. Of course, this
> will be moved to the new compilation unit mentioned above.
>
> * An interface to format the CRYCBD field will be provided via
> the new compilation unit and called from the KVM vm
> initialization.
>
> Signed-off-by: Tony Krowiak <akrowiak@linux.vnet.ibm.com>
> ---
> MAINTAINERS | 10 ++++++
> arch/s390/include/asm/kvm-ap.h | 16 ++++++++++
> arch/s390/include/asm/kvm_host.h | 1 +
> arch/s390/kvm/Kconfig | 1 +
> arch/s390/kvm/Makefile | 2 +-
> arch/s390/kvm/kvm-ap.c | 48 +++++++++++++++++++++++++++++
> arch/s390/kvm/kvm-s390.c | 61 ++++---------------------------------
> 7 files changed, 84 insertions(+), 55 deletions(-)
> create mode 100644 arch/s390/include/asm/kvm-ap.h
> create mode 100644 arch/s390/kvm/kvm-ap.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 0ec5881..72742d5 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -11875,6 +11875,16 @@ W: http://www.ibm.com/developerworks/linux/linux390/
> S: Supported
> F: drivers/s390/crypto/
>
> +S390 VFIO AP DRIVER
> +M: Tony Krowiak <akrowiak@linux.vnet.ibm.com>
> +M: Christian Borntraeger <borntraeger@de.ibm.com>
> +M: Martin Schwidefsky <schwidefsky@de.ibm.com>
> +L: linux-s390@vger.kernel.org
> +W: http://www.ibm.com/developerworks/linux/linux390/
> +S: Supported
> +F: arch/s390/include/asm/kvm/kvm-ap.h
> +F: arch/s390/kvm/kvm-ap.c
> +
> S390 ZFCP DRIVER
> M: Steffen Maier <maier@linux.vnet.ibm.com>
> M: Benjamin Block <bblock@linux.vnet.ibm.com>
> diff --git a/arch/s390/include/asm/kvm-ap.h b/arch/s390/include/asm/kvm-ap.h
> new file mode 100644
> index 0000000..362846c
> --- /dev/null
> +++ b/arch/s390/include/asm/kvm-ap.h
> @@ -0,0 +1,16 @@
> +/*
> + * Adjunct Processor (AP) configuration management for KVM guests
> + *
> + * Copyright IBM Corp. 2017
> + *
> + * Author(s): Tony Krowiak <akrowia@linux.vnet.ibm.com>
> + */
> +
> +#ifndef _ASM_KVM_AP
> +#define _ASM_KVM_AP
> +#include <linux/types.h>
> +#include <linux/kvm_host.h>
> +
> +void kvm_ap_build_crycbd(struct kvm *kvm);
> +
> +#endif /* _ASM_KVM_AP */
> diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
> index 34c9b5b..65a944e 100644
> --- a/arch/s390/include/asm/kvm_host.h
> +++ b/arch/s390/include/asm/kvm_host.h
> @@ -257,6 +257,7 @@ struct kvm_s390_sie_block {
> __u8 reservedf0[12]; /* 0x00f0 */
> #define CRYCB_FORMAT1 0x00000001
> #define CRYCB_FORMAT2 0x00000003
> +#define CRYCB_FORMAT_MASK 0x00000003
> __u32 crycbd; /* 0x00fc */
> __u64 gcr[16]; /* 0x0100 */
> __u64 gbea; /* 0x0180 */
> diff --git a/arch/s390/kvm/Kconfig b/arch/s390/kvm/Kconfig
> index a3dbd45..4ca9077 100644
> --- a/arch/s390/kvm/Kconfig
> +++ b/arch/s390/kvm/Kconfig
> @@ -33,6 +33,7 @@ config KVM
> select HAVE_KVM_INVALID_WAKEUPS
> select SRCU
> select KVM_VFIO
> + select ZCRYPT

I do not think it is a good solution to *always* enable ZCRYPT
when we have KVM.

Pierre


--
Pierre Morel
Linux/KVM/QEMU in Böblingen - Germany

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