On 07.12.2012, at 13:30, Cornelia Huck wrote:
> Add support for injecting machine checks (only repressible
> conditions for now).
>
> This is a bit more involved than I/O interrupts, for these reasons:
>
> - Machine checks come in both floating and cpu varieties.
> - We don't have a bit for machine checks enabling, but have to use
> a roundabout approach with trapping PSW changing instructions and
> watching for opened machine checks.
>
> Reviewed-by: Marcelo Tosatti <mtosa...@redhat.com>
> Signed-off-by: Cornelia Huck <cornelia.h...@de.ibm.com>
> ---
> Documentation/virtual/kvm/api.txt | 4 ++
> arch/s390/include/asm/kvm_host.h | 8 +++
> arch/s390/kvm/intercept.c | 2 +
> arch/s390/kvm/interrupt.c | 112 ++++++++++++++++++++++++++++++++
> arch/s390/kvm/kvm-s390.h | 3 +
> arch/s390/kvm/priv.c | 133 ++++++++++++++++++++++++++++++++++++++
> arch/s390/kvm/trace-s390.h | 6 +-
> include/uapi/linux/kvm.h | 1 +
> 8 files changed, 266 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/virtual/kvm/api.txt
> b/Documentation/virtual/kvm/api.txt
> index e298a72..8617339 100644
> --- a/Documentation/virtual/kvm/api.txt
> +++ b/Documentation/virtual/kvm/api.txt
> @@ -2072,6 +2072,10 @@ KVM_S390_INT_IO(ai,cssid,ssid,schid) (vm) - compound
> value to indicate an
> I/O interrupt (ai - adapter interrupt; cssid,ssid,schid - subchannel);
> I/O interruption parameters in parm (subchannel) and parm64 (intparm,
> interruption subclass)
> +KVM_S390_MCHK (vm, vcpu) - machine check interrupt; cr 14 bits in parm,
> + machine check interrupt code in parm64 (note that
> + machine checks needing further payload are not
> + supported by this ioctl)
>
> Note that the vcpu ioctl is asynchronous to vcpu execution.
>
> diff --git a/arch/s390/include/asm/kvm_host.h
> b/arch/s390/include/asm/kvm_host.h
> index e47f697..773859e 100644
> --- a/arch/s390/include/asm/kvm_host.h
> +++ b/arch/s390/include/asm/kvm_host.h
> @@ -77,8 +77,10 @@ struct kvm_s390_sie_block {
> __u8 reserved40[4]; /* 0x0040 */
> #define LCTL_CR0 0x8000
> #define LCTL_CR6 0x0200
> +#define LCTL_CR14 0x0002
> __u16 lctl; /* 0x0044 */
> __s16 icpua; /* 0x0046 */
> +#define ICTL_LPSW 0x00400000
> __u32 ictl; /* 0x0048 */
> __u32 eca; /* 0x004c */
> __u8 icptcode; /* 0x0050 */
> @@ -189,6 +191,11 @@ struct kvm_s390_emerg_info {
> __u16 code;
> };
>
> +struct kvm_s390_mchk_info {
> + __u64 cr14;
> + __u64 mcic;
> +};
> +
> struct kvm_s390_interrupt_info {
> struct list_head list;
> u64 type;
> @@ -199,6 +206,7 @@ struct kvm_s390_interrupt_info {
> struct kvm_s390_emerg_info emerg;
> struct kvm_s390_extcall_info extcall;
> struct kvm_s390_prefix_info prefix;
> + struct kvm_s390_mchk_info mchk;
> };
> };
>
> diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c
> index 22798ec..ec1177f 100644
> --- a/arch/s390/kvm/intercept.c
> +++ b/arch/s390/kvm/intercept.c
> @@ -106,10 +106,12 @@ static int handle_lctl(struct kvm_vcpu *vcpu)
>
> static intercept_handler_t instruction_handlers[256] = {
> [0x01] = kvm_s390_handle_01,
> + [0x82] = kvm_s390_handle_lpsw,
> [0x83] = kvm_s390_handle_diag,
> [0xae] = kvm_s390_handle_sigp,
> [0xb2] = kvm_s390_handle_b2,
> [0xb7] = handle_lctl,
> + [0xb9] = kvm_s390_handle_b9,
> [0xe5] = kvm_s390_handle_e5,
> [0xeb] = handle_lctlg,
> };
> diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
> index 070ba22..6b10267 100644
> --- a/arch/s390/kvm/interrupt.c
> +++ b/arch/s390/kvm/interrupt.c
> @@ -41,6 +41,11 @@ static int psw_ioint_disabled(struct kvm_vcpu *vcpu)
> return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_IO);
> }
>
> +static int psw_mchk_disabled(struct kvm_vcpu *vcpu)
> +{
> + return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK);
> +}
> +
> static int psw_interrupts_disabled(struct kvm_vcpu *vcpu)
> {
> if ((vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PER) ||
> @@ -82,6 +87,12 @@ static int __interrupt_is_deliverable(struct kvm_vcpu
> *vcpu,
> case KVM_S390_SIGP_SET_PREFIX:
> case KVM_S390_RESTART:
> return 1;
> + case KVM_S390_MCHK:
> + if (psw_mchk_disabled(vcpu))
> + return 0;
> + if (vcpu->arch.sie_block->gcr[14] & inti->mchk.cr14)
> + return 1;
> + return 0;
> default:
> if (is_ioint(inti->type)) {
> if (psw_ioint_disabled(vcpu))
> @@ -119,6 +130,7 @@ static void __reset_intercept_indicators(struct kvm_vcpu
> *vcpu)
> CPUSTAT_IO_INT | CPUSTAT_EXT_INT | CPUSTAT_STOP_INT,
> &vcpu->arch.sie_block->cpuflags);
> vcpu->arch.sie_block->lctl = 0x0000;
> + vcpu->arch.sie_block->ictl &= ~ICTL_LPSW;
> }
>
> static void __set_cpuflag(struct kvm_vcpu *vcpu, u32 flag)
> @@ -142,6 +154,12 @@ static void __set_intercept_indicator(struct kvm_vcpu
> *vcpu,
> case KVM_S390_SIGP_STOP:
> __set_cpuflag(vcpu, CPUSTAT_STOP_INT);
> break;
> + case KVM_S390_MCHK:
> + if (psw_mchk_disabled(vcpu))
> + vcpu->arch.sie_block->ictl |= ICTL_LPSW;
> + else
> + vcpu->arch.sie_block->lctl |= LCTL_CR14;
> + break;
> default:
> if (is_ioint(inti->type)) {
> if (psw_ioint_disabled(vcpu))
> @@ -330,6 +348,32 @@ static void __do_deliver_interrupt(struct kvm_vcpu *vcpu,
> exception = 1;
> break;
>
> + case KVM_S390_MCHK:
> + VCPU_EVENT(vcpu, 4, "interrupt: machine check mcic=%llx",
> + inti->mchk.mcic);
> + trace_kvm_s390_deliver_interrupt(vcpu->vcpu_id, inti->type,
> + inti->mchk.cr14,
> + inti->mchk.mcic);
> + rc = kvm_s390_vcpu_store_status(vcpu,
> + KVM_S390_STORE_STATUS_PREFIXED);
> + if (rc == -EFAULT)
> + exception = 1;
> +
> + rc = put_guest_u64(vcpu, __LC_MCCK_CODE, inti->mchk.mcic);
> + if (rc == -EFAULT)
> + exception = 1;
> +
> + rc = copy_to_guest(vcpu, __LC_MCK_OLD_PSW,
> + &vcpu->arch.sie_block->gpsw, sizeof(psw_t));
> + if (rc == -EFAULT)
> + exception = 1;
> +
> + rc = copy_from_guest(vcpu, &vcpu->arch.sie_block->gpsw,
> + __LC_MCK_NEW_PSW, sizeof(psw_t));
> + if (rc == -EFAULT)
> + exception = 1;
> + break;
> +
> default:
> if (is_ioint(inti->type)) {
> __u32 param0 = ((__u32)inti->io.subchannel_id << 16) |
> @@ -593,6 +637,61 @@ void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu
> *vcpu)
> }
> }
>
> +void kvm_s390_deliver_pending_machine_checks(struct kvm_vcpu *vcpu)
> +{
> + struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
> + struct kvm_s390_float_interrupt *fi = vcpu->arch.local_int.float_int;
> + struct kvm_s390_interrupt_info *n, *inti = NULL;
> + int deliver;
> +
> + __reset_intercept_indicators(vcpu);
> + if (atomic_read(&li->active)) {
> + do {
> + deliver = 0;
> + spin_lock_bh(&li->lock);
> + list_for_each_entry_safe(inti, n, &li->list, list) {
> + if ((inti->type == KVM_S390_MCHK) &&
> + __interrupt_is_deliverable(vcpu, inti)) {
> + list_del(&inti->list);
> + deliver = 1;
> + break;
> + }
> + __set_intercept_indicator(vcpu, inti);
> + }
> + if (list_empty(&li->list))
> + atomic_set(&li->active, 0);
> + spin_unlock_bh(&li->lock);
> + if (deliver) {
> + __do_deliver_interrupt(vcpu, inti);
> + kfree(inti);
> + }
> + } while (deliver);
> + }
> +
> + if (atomic_read(&fi->active)) {
> + do {
> + deliver = 0;
> + spin_lock(&fi->lock);
> + list_for_each_entry_safe(inti, n, &fi->list, list) {
> + if ((inti->type == KVM_S390_MCHK) &&
> + __interrupt_is_deliverable(vcpu, inti)) {
> + list_del(&inti->list);
> + deliver = 1;
> + break;
> + }
> + __set_intercept_indicator(vcpu, inti);
> + }
> + if (list_empty(&fi->list))
> + atomic_set(&fi->active, 0);
> + spin_unlock(&fi->lock);
> + if (deliver) {
> + __do_deliver_interrupt(vcpu, inti);
> + kfree(inti);
> + }
> + } while (deliver);
> + }
> +}
> +
> int kvm_s390_inject_program_int(struct kvm_vcpu *vcpu, u16 code)
> {
> struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int;
> @@ -646,6 +745,13 @@ int kvm_s390_inject_vm(struct kvm *kvm,
> case KVM_S390_INT_EMERGENCY:
> kfree(inti);
> return -EINVAL;
> + case KVM_S390_MCHK:
> + VM_EVENT(kvm, 5, "inject: machine check parm64:%llx",
> + s390int->parm64);
> + inti->type = s390int->type;
> + inti->mchk.cr14 = s390int->parm; /* upper bits are not used */
> + inti->mchk.mcic = s390int->parm64;
> + break;
> default:
> if (!is_ioint(s390int->type)) {
> kfree(inti);
> @@ -755,6 +861,12 @@ int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
> inti->type = s390int->type;
> inti->emerg.code = s390int->parm;
> break;
> + case KVM_S390_MCHK:
> + VCPU_EVENT(vcpu, 5, "inject: machine check parm64:%llx",
> + s390int->parm64);
> + inti->type = s390int->type;
> + inti->mchk.mcic = s390int->parm64;
> + break;
> case KVM_S390_INT_VIRTIO:
> case KVM_S390_INT_SERVICE:
> default:
> diff --git a/arch/s390/kvm/kvm-s390.h b/arch/s390/kvm/kvm-s390.h
> index d75bc5e..b1e1cb6 100644
> --- a/arch/s390/kvm/kvm-s390.h
> +++ b/arch/s390/kvm/kvm-s390.h
> @@ -69,6 +69,7 @@ int kvm_s390_handle_wait(struct kvm_vcpu *vcpu);
> enum hrtimer_restart kvm_s390_idle_wakeup(struct hrtimer *timer);
> void kvm_s390_tasklet(unsigned long parm);
> void kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu);
> +void kvm_s390_deliver_pending_machine_checks(struct kvm_vcpu *vcpu);
> int kvm_s390_inject_vm(struct kvm *kvm,
> struct kvm_s390_interrupt *s390int);
> int kvm_s390_inject_vcpu(struct kvm_vcpu *vcpu,
> @@ -80,6 +81,8 @@ int kvm_s390_inject_sigp_stop(struct kvm_vcpu *vcpu, int
> action);
> int kvm_s390_handle_b2(struct kvm_vcpu *vcpu);
> int kvm_s390_handle_e5(struct kvm_vcpu *vcpu);
> int kvm_s390_handle_01(struct kvm_vcpu *vcpu);
> +int kvm_s390_handle_b9(struct kvm_vcpu *vcpu);
> +int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu);
>
> /* implemented in sigp.c */
> int kvm_s390_handle_sigp(struct kvm_vcpu *vcpu);
> diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c
> index d768906..66258b9 100644
> --- a/arch/s390/kvm/priv.c
> +++ b/arch/s390/kvm/priv.c
> @@ -176,6 +176,101 @@ static int handle_stfl(struct kvm_vcpu *vcpu)
> return 0;
> }
>
> +static void handle_new_psw(struct kvm_vcpu *vcpu)
> +{
> + /* Check whether the new psw is enabled for machine checks. */
> + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_MCHECK)
> + kvm_s390_deliver_pending_machine_checks(vcpu);
> +}
> +
> +int kvm_s390_handle_lpsw(struct kvm_vcpu *vcpu)
> +{
> + int base2 = vcpu->arch.sie_block->ipb >> 28;
> + int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
> + u64 addr;
> + u64 uninitialized_var(new_psw);
> +
> + if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
> + return kvm_s390_inject_program_int(vcpu,
> + PGM_PRIVILEGED_OPERATION);
> +
> + addr = disp2;
> + if (base2)
> + addr += vcpu->run->s.regs.gprs[base2];
This is a pretty common address offset scheme. Please extract it into a
separate function (which the compiler will inline again).
> +
> + if (addr & 7) {
> + kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
> + goto out;
> + }
> +
> + if (get_guest_u64(vcpu, addr, &new_psw)) {
> + kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
> + goto out;
> + }
> +
> + if (!(new_psw & 0x0008000000000000)) {
Magic number? Doesn't this bit have a name?
> + kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
> + goto out;
> + }
> +
> + vcpu->arch.sie_block->gpsw.mask = new_psw & 0xfff7ffff80000000;
> + vcpu->arch.sie_block->gpsw.addr = new_psw & 0x000000007fffffff;
> +
> + if ((vcpu->arch.sie_block->gpsw.mask & 0xb80800fe00000000) ||
> + (!(vcpu->arch.sie_block->gpsw.mask & 0x0000000180000000) &&
> + (vcpu->arch.sie_block->gpsw.addr & 0x000000007ff00000)) ||
> + ((vcpu->arch.sie_block->gpsw.mask & 0x0000000180000000) ==
> + 0x0000000100000000)) {
> + kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
Lots of magic numbers :). I'm sure these have names too ;). I really like to be
able to read this cod without looking at the POP all the time.
> + goto out;
> + }
> +
> + handle_new_psw(vcpu);
> +out:
> + return 0;
> +}
> +
> +static int handle_lpswe(struct kvm_vcpu *vcpu)
> +{
> + int base2 = vcpu->arch.sie_block->ipb >> 28;
> + int disp2 = ((vcpu->arch.sie_block->ipb & 0x0fff0000) >> 16);
> + u64 addr;
> + psw_t new_psw;
> +
> + addr = disp2;
> + if (base2)
> + addr += vcpu->run->s.regs.gprs[base2];
> +
> + if (addr & 7) {
> + kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
> + goto out;
> + }
> +
> + if (copy_from_guest(vcpu, &new_psw, addr, sizeof(new_psw))) {
> + kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
> + goto out;
> + }
> +
> + vcpu->arch.sie_block->gpsw.mask = new_psw.mask;
> + vcpu->arch.sie_block->gpsw.addr = new_psw.addr;
> +
> + if ((vcpu->arch.sie_block->gpsw.mask & 0xb80800fe7fffffff) ||
> + (((vcpu->arch.sie_block->gpsw.mask & 0x0000000180000000) ==
> + 0x0000000080000000) &&
> + (vcpu->arch.sie_block->gpsw.addr & 0xffffffff80000000)) ||
> + (!(vcpu->arch.sie_block->gpsw.mask & 0x0000000180000000) &&
> + (vcpu->arch.sie_block->gpsw.addr & 0xfffffffffff00000)) ||
> + ((vcpu->arch.sie_block->gpsw.mask & 0x0000000180000000) ==
> + 0x0000000100000000)) {
> + kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);
> + goto out;
> + }
That function looks quite similar to the one above. Any chance to move them
together?
Alex
> +
> + handle_new_psw(vcpu);
> +out:
> + return 0;
> +}
> +
> static int handle_stidp(struct kvm_vcpu *vcpu)
> {
> int base2 = vcpu->arch.sie_block->ipb >> 28;
> @@ -309,6 +404,7 @@ static intercept_handler_t priv_handlers[256] = {
> [0x5f] = handle_chsc,
> [0x7d] = handle_stsi,
> [0xb1] = handle_stfl,
> + [0xb2] = handle_lpswe,
> };
>
> int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
> @@ -333,6 +429,43 @@ int kvm_s390_handle_b2(struct kvm_vcpu *vcpu)
> return -EOPNOTSUPP;
> }
>
> +static int handle_epsw(struct kvm_vcpu *vcpu)
> +{
> + int reg1, reg2;
> +
> + reg1 = (vcpu->arch.sie_block->ipb & 0x00f00000) >> 24;
> + reg2 = (vcpu->arch.sie_block->ipb & 0x000f0000) >> 16;
> + vcpu->run->s.regs.gprs[reg1] &= 0xffffffff00000000;
> + vcpu->run->s.regs.gprs[reg1] |= vcpu->arch.sie_block->gpsw.mask >> 32;
> + if (reg2) {
> + vcpu->run->s.regs.gprs[reg2] &= 0xffffffff00000000;
> + vcpu->run->s.regs.gprs[reg2] |=
> + vcpu->arch.sie_block->gpsw.mask & 0x00000000ffffffff;
> + }
> + return 0;
> +}
> +
> +static intercept_handler_t b9_handlers[256] = {
> + [0x8d] = handle_epsw,
> +};
> +
> +int kvm_s390_handle_b9(struct kvm_vcpu *vcpu)
> +{
> + intercept_handler_t handler;
> +
> + /* This is handled just as for the B2 instructions. */
> + handler = b9_handlers[vcpu->arch.sie_block->ipa & 0x00ff];
> + if (handler) {
> + if ((handler != handle_epsw) &&
> + (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE))
> + return kvm_s390_inject_program_int(vcpu,
> + PGM_PRIVILEGED_OPERATION);
> + else
> + return handler(vcpu);
> + }
> + return -EOPNOTSUPP;
> +}
> +
> static int handle_tprot(struct kvm_vcpu *vcpu)
> {
> int base1 = (vcpu->arch.sie_block->ipb & 0xf0000000) >> 28;
> diff --git a/arch/s390/kvm/trace-s390.h b/arch/s390/kvm/trace-s390.h
> index 90fdf85..95fbc1a 100644
> --- a/arch/s390/kvm/trace-s390.h
> +++ b/arch/s390/kvm/trace-s390.h
> @@ -141,13 +141,13 @@ TRACE_EVENT(kvm_s390_inject_vcpu,
> * Trace point for the actual delivery of interrupts.
> */
> TRACE_EVENT(kvm_s390_deliver_interrupt,
> - TP_PROTO(unsigned int id, __u64 type, __u32 data0, __u64 data1),
> + TP_PROTO(unsigned int id, __u64 type, __u64 data0, __u64 data1),
> TP_ARGS(id, type, data0, data1),
>
> TP_STRUCT__entry(
> __field(int, id)
> __field(__u32, inttype)
> - __field(__u32, data0)
> + __field(__u64, data0)
> __field(__u64, data1)
> ),
>
> @@ -159,7 +159,7 @@ TRACE_EVENT(kvm_s390_deliver_interrupt,
> ),
>
> TP_printk("deliver interrupt (vcpu %d): type:%x (%s) " \
> - "data:%08x %016llx",
> + "data:%08llx %016llx",
> __entry->id, __entry->inttype,
> __print_symbolic(__entry->inttype, kvm_s390_int_type),
> __entry->data0, __entry->data1)
> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> index e676940..22859dc 100644
> --- a/include/uapi/linux/kvm.h
> +++ b/include/uapi/linux/kvm.h
> @@ -397,6 +397,7 @@ struct kvm_s390_psw {
> #define KVM_S390_PROGRAM_INT 0xfffe0001u
> #define KVM_S390_SIGP_SET_PREFIX 0xfffe0002u
> #define KVM_S390_RESTART 0xfffe0003u
> +#define KVM_S390_MCHK 0xfffe1000u
> #define KVM_S390_INT_VIRTIO 0xffff2603u
> #define KVM_S390_INT_SERVICE 0xffff2401u
> #define KVM_S390_INT_EMERGENCY 0xffff1201u
> --
> 1.7.12.4
>
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