KVM: s390: add metric vcpus_in_sie to struct kvm_arch
PATCH 4/10 KVM: s390: add metric vcpus_in_sie to struct kvm_arch
This metric will allow to identify how many vcpus are currently running for a given kvm in SIE context. Its value is between 0 and the number of vcpus defined for the kvm guest, but never lager than the number of cpus available to the KVM host in total.
This metric is required to decide if the GISA IAM has to be restored from the kvm arch field of the guest. That will be the case when no vcpu is in SIE context. (vcpus_in_sie == 0)
Signed-off-by Michael Mueller <[email protected]>
Reviewed-by Pierre Morel <[email protected]>
--- arch/s390/include/asm/kvm_host.h | 1 + arch/s390/kvm/kvm-s390.c | 4 ++++ 2 files changed, 5 insertions(+)
arch/s390/include/asm/kvm_host.h +1 -0
@@ -839,6 +839,7 @@ struct kvm_arch{DECLARE_BITMAP (cpu_feat,KVM_S390_VM_CPU_FEAT_NR_BITS );struct kvm_s390_gisa *gisa;int gib_in_use; +atomic_t vcpus_in_sie; };#define KVM_HVA_ERR_BAD (-1UL)
arch/s390/kvm/kvm-s390.c +4 -0
@@ -3358,6 +3358,8 @@ static int vcpu_pre_run(struct kvm_vcpu *vcpu)kvm_s390_patch_guest_per_regs (vcpu); } +atomic_inc (&vcpu->kvm->arch.vcpus_in_sie); + vcpu->arch.sie_block->icptcode =0 ; cpuflags =atomic_read (&vcpu->arch.sie_block->cpuflags);VCPU_EVENT (vcpu,6 ,"entering sie flags %x" , cpuflags);
@@ -3417,6 +3419,8 @@ static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason) vcpu->run->s.regs.gprs[14 ] = vcpu->arch.sie_block->gg14; vcpu->run->s.regs.gprs[15 ] = vcpu->arch.sie_block->gg15; +atomic_dec (&vcpu->kvm->arch.vcpus_in_sie); +if (exit_reason == -EINTR ) {VCPU_EVENT (vcpu,3 ,"%s" ,"machine check" ); sie_page = container_of(vcpu->arch.sie_block,
Signature · 1 line
2.17.0