Commit 2dca485f authored Oct 31, 2014 by Christian Borntraeger

KVM: s390: flush CPU on load control



some control register changes will flush some aspects of the CPU, e.g.
POP explicitely mentions that for CR9-CR11 "TLBs may be cleared".
Instead of trying to be clever and only flush on specific CRs, let
play safe and flush on all lctl(g) as future machines might define
new bits in CRs. Load control intercept should not happen that often.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org

parent 1365039d

arch/s390/kvm/priv.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -791,7 +791,7 @@ int kvm_s390_handle_lctl(struct kvm_vcpu *vcpu)
		break;
		reg = (reg + 1) % 16;
		} while (1);

		kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
		return 0;
		}

		@@ -863,7 +863,7 @@ static int handle_lctlg(struct kvm_vcpu *vcpu)
		break;
		reg = (reg + 1) % 16;
		} while (1);

		kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
		return 0;
		}