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    Subject[PATCH v1 RFC 5/6] KVM: s390: initial implementation of soft facilities
    Date
    This patch implements the new state soft_fac_bits. This state
    defines which facilities are emulated in kernel and not in processor
    or millicode. Currently all bits are cleared.

    Signed-off-by: Michael Mueller <mimu@linux.vnet.ibm.com>
    ---
    arch/s390/kvm/Makefile | 2 +-
    arch/s390/kvm/kvm-s390.h | 3 +++
    arch/s390/kvm/softfac.c | 38 ++++++++++++++++++++++++++++++++++++++
    3 files changed, 42 insertions(+), 1 deletion(-)
    create mode 100644 arch/s390/kvm/softfac.c

    diff --git a/arch/s390/kvm/Makefile b/arch/s390/kvm/Makefile
    index 88aa28b..586f686 100644
    --- a/arch/s390/kvm/Makefile
    +++ b/arch/s390/kvm/Makefile
    @@ -12,6 +12,6 @@ common-objs = $(KVM)/kvm_main.o $(KVM)/eventfd.o $(KVM)/async_pf.o $(KVM)/irqch
    ccflags-y := -Ivirt/kvm -Iarch/s390/kvm

    kvm-objs := $(common-objs) kvm-s390.o intercept.o interrupt.o priv.o sigp.o
    -kvm-objs += diag.o config.o gaccess.o guestdbg.o ibc.o
    +kvm-objs += diag.o config.o gaccess.o guestdbg.o ibc.o softfac.o

    obj-$(CONFIG_KVM) += kvm.o
    diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h
    index 3715917..10de678 100644
    --- a/arch/s390/kvm/kvm-s390.h
    +++ b/arch/s390/kvm/kvm-s390.h
    @@ -261,4 +261,7 @@ unsigned short kvm_s390_lowest_ibc(void);
    unsigned short kvm_s390_latest_ibc(void);
    bool kvm_s390_has_ibc(void);

    +/* implemented in softfac.c */
    +unsigned int stsfle(unsigned long *fac, unsigned long size);
    +
    #endif
    diff --git a/arch/s390/kvm/softfac.c b/arch/s390/kvm/softfac.c
    new file mode 100644
    index 0000000..1c489d8
    --- /dev/null
    +++ b/arch/s390/kvm/softfac.c
    @@ -0,0 +1,38 @@
    +/*
    + * Registration of KVM emulated facilities
    + *
    + * Copyright IBM Corp. 2014
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License (version 2 only)
    + * as published by the Free Software Foundation.
    + *
    + * Author(s): Michael Mueller <mimu@linux.vnet.ibm.com>
    + */
    +
    +#include "kvm-s390.h"
    +
    +/*
    + * The soft facilities define which of the facilities are emulatable
    + * in KVM. The size must be identical to the size of the cpu facility
    + * list.
    + */
    +static unsigned long soft_fac_bits[S390_ARCH_FAC_LIST_SIZE_U64];
    +
    +/**
    + * stsfle():
    + * store soft facility list extended, copies a subset of the
    + * soft facility list
    + * @fac address of buffer where the facilities should be stored
    + * @size number of double words + 1 to store in @fac
    + * @returns number of bytes being copied
    + */
    +unsigned int stsfle(unsigned long *fac, unsigned long size)
    +{
    + if (size >= S390_ARCH_FAC_LIST_SIZE_U64)
    + size = S390_ARCH_FAC_LIST_SIZE_U64 - 1;
    + size = (!test_facility(7)) ? 4 : (size + 1) * sizeof(*fac);
    + memcpy(fac, soft_fac_bits, size);
    +
    + return size;
    +}
    --
    1.8.3.1


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