lkml.org 
[lkml]   [2018]   [Apr]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Date
    From
    SubjectRe: [PATCH 4.4 12/50] KVM: s390: wire up bpb feature
    On Fri, 27 Apr 2018 17:53:46 +0200
    Christian Borntraeger <borntraeger@de.ibm.com> wrote:

    > On 04/27/2018 05:46 PM, Greg Kroah-Hartman wrote:
    > > On Fri, Apr 27, 2018 at 05:17:15PM +0200, Greg Kroah-Hartman wrote:
    > >> On Fri, Apr 27, 2018 at 05:10:04PM +0200, Christian Borntraeger wrote:
    > >>>
    > >>>
    > >>> On 04/27/2018 03:58 PM, Greg Kroah-Hartman wrote:
    > >>>> 4.4-stable review patch. If anyone has any objections, please let me know.
    > >>>>
    > >>>> ------------------
    > >>>>
    > >>>> From: Martin Schwidefsky <schwidefsky@de.ibm.com>
    > >>>>
    > >>>>
    > >>>> From: Christian Borntraeger <borntraeger@de.ibm.com>
    > >>
    > >> Ick, that is wrong right there, my scripts messed up, this should not
    > >> have 2 author lines :(
    > >>
    > >> I'll go look at all of these, odds are it made the same error
    > >> everywhere...
    > >
    > > Yes, I've now fixed that up in the queue.
    >
    > As this patch backport was also functionally incorrect and Martin is already away
    > do you want me to send an updated version?

    Checked my 4.4 backport git branch and indeed the hunk is misplaced.
    Sometime I wonder about the patch tool and the hickups it can produce.

    My take on the replacement patch looks as follows:

    ---
    From 82f20b6237a8d04378c8f4a1614bf32a6c8d8a8b Mon Sep 17 00:00:00 2001
    From: Christian Borntraeger <borntraeger@de.ibm.com>
    Date: Wed, 17 Jan 2018 14:44:34 +0100
    Subject: [PATCH 03/18] KVM: s390: wire up bpb feature
    MIME-Version: 1.0
    Content-Type: text/plain; charset=UTF-8
    Content-Transfer-Encoding: 8bit

    [ Upstream commit 35b3fde6203b932b2b1a5b53b3d8808abc9c4f60 ]

    The new firmware interfaces for branch prediction behaviour changes
    are transparently available for the guest. Nevertheless, there is
    new state attached that should be migrated and properly resetted.
    Provide a mechanism for handling reset, migration and VSIE.

    Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
    Reviewed-by: David Hildenbrand <david@redhat.com>
    Reviewed-by: Cornelia Huck <cohuck@redhat.com>
    [Changed capability number to 152. - Radim]
    Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
    Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
    ---
    arch/s390/include/asm/kvm_host.h | 3 ++-
    arch/s390/include/uapi/asm/kvm.h | 3 +++
    arch/s390/kvm/kvm-s390.c | 12 ++++++++++++
    include/uapi/linux/kvm.h | 1 +
    4 files changed, 18 insertions(+), 1 deletion(-)

    diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h
    index e9a983f40a24..7d9c5917da2b 100644
    --- a/arch/s390/include/asm/kvm_host.h
    +++ b/arch/s390/include/asm/kvm_host.h
    @@ -136,7 +136,8 @@ struct kvm_s390_sie_block {
    __u16 ipa; /* 0x0056 */
    __u32 ipb; /* 0x0058 */
    __u32 scaoh; /* 0x005c */
    - __u8 reserved60; /* 0x0060 */
    +#define FPF_BPBC 0x20
    + __u8 fpf; /* 0x0060 */
    __u8 ecb; /* 0x0061 */
    __u8 ecb2; /* 0x0062 */
    #define ECB3_AES 0x04
    diff --git a/arch/s390/include/uapi/asm/kvm.h b/arch/s390/include/uapi/asm/kvm.h
    index ef1a5fcc6c66..3aec52253c04 100644
    --- a/arch/s390/include/uapi/asm/kvm.h
    +++ b/arch/s390/include/uapi/asm/kvm.h
    @@ -151,6 +151,7 @@ struct kvm_guest_debug_arch {
    #define KVM_SYNC_ARCH0 (1UL << 4)
    #define KVM_SYNC_PFAULT (1UL << 5)
    #define KVM_SYNC_VRS (1UL << 6)
    +#define KVM_SYNC_BPBC (1UL << 10)
    /* definition of registers in kvm_run */
    struct kvm_sync_regs {
    __u64 prefix; /* prefix register */
    @@ -168,6 +169,8 @@ struct kvm_sync_regs {
    __u64 vrs[32][2]; /* vector registers */
    __u8 reserved[512]; /* for future vector expansion */
    __u32 fpc; /* only valid with vector registers */
    + __u8 bpbc : 1; /* bp mode */
    + __u8 reserved2 : 7;
    };

    #define KVM_REG_S390_TODPR (KVM_REG_S390 | KVM_REG_SIZE_U32 | 0x1)
    diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
    index 23e3f5d77a24..ca03c847127a 100644
    --- a/arch/s390/kvm/kvm-s390.c
    +++ b/arch/s390/kvm/kvm-s390.c
    @@ -257,6 +257,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
    case KVM_CAP_S390_VECTOR_REGISTERS:
    r = MACHINE_HAS_VX;
    break;
    + case KVM_CAP_S390_BPB:
    + r = test_facility(82);
    + break;
    default:
    r = 0;
    }
    @@ -1262,6 +1265,8 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
    KVM_SYNC_CRS |
    KVM_SYNC_ARCH0 |
    KVM_SYNC_PFAULT;
    + if (test_kvm_facility(vcpu->kvm, 82))
    + vcpu->run->kvm_valid_regs |= KVM_SYNC_BPBC;
    if (test_kvm_facility(vcpu->kvm, 129))
    vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS;

    @@ -1327,6 +1332,7 @@ static void kvm_s390_vcpu_initial_reset(struct kvm_vcpu *vcpu)
    current->thread.fpu.fpc = 0;
    vcpu->arch.sie_block->gbea = 1;
    vcpu->arch.sie_block->pp = 0;
    + vcpu->arch.sie_block->fpf &= ~FPF_BPBC;
    vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
    kvm_clear_async_pf_completion_queue(vcpu);
    if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
    @@ -2145,6 +2151,11 @@ static void sync_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
    if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
    kvm_clear_async_pf_completion_queue(vcpu);
    }
    + if ((kvm_run->kvm_dirty_regs & KVM_SYNC_BPBC) &&
    + test_kvm_facility(vcpu->kvm, 82)) {
    + vcpu->arch.sie_block->fpf &= ~FPF_BPBC;
    + vcpu->arch.sie_block->fpf |= kvm_run->s.regs.bpbc ? FPF_BPBC : 0;
    + }
    kvm_run->kvm_dirty_regs = 0;
    }

    @@ -2162,6 +2173,7 @@ static void store_regs(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
    kvm_run->s.regs.pft = vcpu->arch.pfault_token;
    kvm_run->s.regs.pfs = vcpu->arch.pfault_select;
    kvm_run->s.regs.pfc = vcpu->arch.pfault_compare;
    + kvm_run->s.regs.bpbc = (vcpu->arch.sie_block->fpf & FPF_BPBC) == FPF_BPBC;
    }

    int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
    diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
    index 03f3618612aa..376d0ab5b9f2 100644
    --- a/include/uapi/linux/kvm.h
    +++ b/include/uapi/linux/kvm.h
    @@ -831,6 +831,7 @@ struct kvm_ppc_smmu_info {
    #define KVM_CAP_GUEST_DEBUG_HW_WPS 120
    #define KVM_CAP_SPLIT_IRQCHIP 121
    #define KVM_CAP_IOEVENTFD_ANY_LENGTH 122
    +#define KVM_CAP_S390_BPB 152

    #ifdef KVM_CAP_IRQ_ROUTING

    --
    2.13.5
    \
     
     \ /
      Last update: 2018-04-29 09:52    [W:3.481 / U:0.048 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site