From fc34531db3cf8c422f2ff7cf4ef507a3ca672cd2 Mon Sep 17 00:00:00 2001 From: Christian Borntraeger Date: Thu, 17 Jun 2010 23:16:20 +0200 Subject: KVM: s390: Don't exit SIE on SIGP sense running Newer (guest) kernels use sigp sense running in their spinlock implementation to check if the other cpu is running before yielding the processor. This revealed some wrong guest settings, causing unnecessary exits for every sigp sense running. Signed-off-by: Christian Borntraeger Signed-off-by: Avi Kivity diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h index 27605b6..b95710a 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -26,7 +26,7 @@ struct sca_entry { atomic_t scn; - __u64 reserved; + __u32 reserved; __u64 sda; __u64 reserved2[2]; } __attribute__((packed)); diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 0079b8c..08a3b35 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -207,6 +207,7 @@ out_nokvm: void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu) { VCPU_EVENT(vcpu, 3, "%s", "free cpu"); + clear_bit(63 - vcpu->vcpu_id, (unsigned long *) &vcpu->kvm->arch.sca->mcn); if (vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda == (__u64) vcpu->arch.sie_block) vcpu->kvm->arch.sca->cpu[vcpu->vcpu_id].sda = 0; @@ -296,7 +297,7 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu) { atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH); set_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests); - vcpu->arch.sie_block->ecb = 2; + vcpu->arch.sie_block->ecb = 6; vcpu->arch.sie_block->eca = 0xC1002001U; vcpu->arch.sie_block->fac = (int) (long) facilities; hrtimer_init(&vcpu->arch.ckc_timer, CLOCK_REALTIME, HRTIMER_MODE_ABS); @@ -329,6 +330,7 @@ struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, kvm->arch.sca->cpu[id].sda = (__u64) vcpu->arch.sie_block; vcpu->arch.sie_block->scaoh = (__u32)(((__u64)kvm->arch.sca) >> 32); vcpu->arch.sie_block->scaol = (__u32)(__u64)kvm->arch.sca; + set_bit(63 - id, (unsigned long *) &kvm->arch.sca->mcn); spin_lock_init(&vcpu->arch.local_int.lock); INIT_LIST_HEAD(&vcpu->arch.local_int.list); -- cgit v0.10.2