diff options
Diffstat (limited to 'arch/s390/kvm')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 2 | ||||
| -rw-r--r-- | arch/s390/kvm/sthyi.c | 11 |
2 files changed, 13 insertions, 0 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 1c10254..44297ff 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -1151,6 +1151,8 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type) rc = -ENOMEM; + ratelimit_state_init(&kvm->arch.sthyi_limit, 5 * HZ, 500); + kvm->arch.use_esca = 0; /* start with basic SCA */ rwlock_init(&kvm->arch.sca_lock); kvm->arch.sca = (struct bsca_block *) get_zeroed_page(GFP_KERNEL); diff --git a/arch/s390/kvm/sthyi.c b/arch/s390/kvm/sthyi.c index 894d562..bd98b7d 100644 --- a/arch/s390/kvm/sthyi.c +++ b/arch/s390/kvm/sthyi.c @@ -12,6 +12,7 @@ #include <linux/errno.h> #include <linux/pagemap.h> #include <linux/vmalloc.h> +#include <linux/ratelimit.h> #include <asm/kvm_host.h> #include <asm/asm-offsets.h> @@ -403,6 +404,16 @@ int handle_sthyi(struct kvm_vcpu *vcpu) u64 code, addr, cc = 0; struct sthyi_sctns *sctns = NULL; + /* + * STHYI requires extensive locking in the higher hypervisors + * and is very computational/memory expensive. Therefore we + * ratelimit the executions per VM. + */ + if (!__ratelimit(&vcpu->kvm->arch.sthyi_limit)) { + kvm_s390_retry_instr(vcpu); + return 0; + } + kvm_s390_get_regs_rre(vcpu, ®1, ®2); code = vcpu->run->s.regs.gprs[reg1]; addr = vcpu->run->s.regs.gprs[reg2]; |