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| author | Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com> | 2015-04-23 16:09:06 +0200 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2015-11-30 12:47:07 +0100 |
| commit | bc784ccee5eb9ae1e737927eb9d8a0fbf7601abc (patch) | |
| tree | b436d5a0a238f488c81c054abb4e9ffceed8b882 /arch/s390/kvm/interrupt.c | |
| parent | a6e2f683e7691949d33ca9392e7807cfa9aca34e (diff) | |
| download | linux-bc784ccee5eb9ae1e737927eb9d8a0fbf7601abc.tar.bz2 | |
KVM: s390: Introduce new structures
This patch adds new structures and updates some existing ones to
provide the base for Extended SCA functionality.
The old sca_* structures were renamed to bsca_* to keep things uniform.
The access to fields of SIGP controls were turned into bitfields instead
of hardcoded bitmasks.
Signed-off-by: Eugene (jno) Dvurechenski <jno@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/kvm/interrupt.c')
| -rw-r--r-- | arch/s390/kvm/interrupt.c | 31 |
1 files changed, 19 insertions, 12 deletions
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index 2a4718af9dcf..aa221a48cc7c 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -37,25 +37,32 @@ /* handle external calls via sigp interpretation facility */ static int sca_ext_call_pending(struct kvm_vcpu *vcpu, int *src_id) { - struct sca_block *sca = vcpu->kvm->arch.sca; - uint8_t sigp_ctrl = sca->cpu[vcpu->vcpu_id].sigp_ctrl; + struct bsca_block *sca = vcpu->kvm->arch.sca; + union bsca_sigp_ctrl sigp_ctrl = sca->cpu[vcpu->vcpu_id].sigp_ctrl; if (src_id) - *src_id = sigp_ctrl & SIGP_CTRL_SCN_MASK; + *src_id = sigp_ctrl.scn; - return sigp_ctrl & SIGP_CTRL_C && + return sigp_ctrl.c && atomic_read(&vcpu->arch.sie_block->cpuflags) & CPUSTAT_ECALL_PEND; } static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id) { - struct sca_block *sca = vcpu->kvm->arch.sca; - uint8_t *sigp_ctrl = &(sca->cpu[vcpu->vcpu_id].sigp_ctrl); - uint8_t new_val = SIGP_CTRL_C | (src_id & SIGP_CTRL_SCN_MASK); - uint8_t old_val = *sigp_ctrl & ~SIGP_CTRL_C; + int expect, rc; + struct bsca_block *sca = vcpu->kvm->arch.sca; + union bsca_sigp_ctrl *sigp_ctrl = &(sca->cpu[vcpu->vcpu_id].sigp_ctrl); + union bsca_sigp_ctrl new_val = {0}, old_val = *sigp_ctrl; - if (cmpxchg(sigp_ctrl, old_val, new_val) != old_val) { + new_val.scn = src_id; + new_val.c = 1; + old_val.c = 0; + + expect = old_val.value; + rc = cmpxchg(&sigp_ctrl->value, old_val.value, new_val.value); + + if (rc != expect) { /* another external call is pending */ return -EBUSY; } @@ -65,12 +72,12 @@ static int sca_inject_ext_call(struct kvm_vcpu *vcpu, int src_id) static void sca_clear_ext_call(struct kvm_vcpu *vcpu) { - struct sca_block *sca = vcpu->kvm->arch.sca; + struct bsca_block *sca = vcpu->kvm->arch.sca; struct kvm_s390_local_interrupt *li = &vcpu->arch.local_int; - uint8_t *sigp_ctrl = &(sca->cpu[vcpu->vcpu_id].sigp_ctrl); + union bsca_sigp_ctrl *sigp_ctrl = &(sca->cpu[vcpu->vcpu_id].sigp_ctrl); atomic_andnot(CPUSTAT_ECALL_PEND, li->cpuflags); - *sigp_ctrl = 0; + sigp_ctrl->value = 0; } int psw_extint_disabled(struct kvm_vcpu *vcpu) |