From 9fb6c9b3fea1b1d1c6f14178373e8f7235f3b681 Mon Sep 17 00:00:00 2001 From: QingFeng Hao Date: Fri, 29 Sep 2017 12:41:51 +0200 Subject: s390/sthyi: add cache to store hypervisor info STHYI requires extensive locking in the higher hypervisors and is very computational/memory expensive. Therefore we cache the retrieved hypervisor info whose valid period is 1s with mutex to allow concurrent access. rw semaphore can't benefit here due to cache line bounce. Signed-off-by: QingFeng Hao Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky --- arch/s390/kvm/intercept.c | 10 ---------- 1 file changed, 10 deletions(-) (limited to 'arch/s390/kvm/intercept.c') diff --git a/arch/s390/kvm/intercept.c b/arch/s390/kvm/intercept.c index 46adda5e2b2c..8fe034beb623 100644 --- a/arch/s390/kvm/intercept.c +++ b/arch/s390/kvm/intercept.c @@ -375,16 +375,6 @@ int handle_sthyi(struct kvm_vcpu *vcpu) if (!test_kvm_facility(vcpu->kvm, 74)) return kvm_s390_inject_program_int(vcpu, PGM_OPERATION); - /* - * 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]; -- cgit v1.2.3