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KVM: s390: flush CPU on load control

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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
This commit is contained in:
Christian Borntraeger 2014-10-31 09:24:20 +01:00
parent 1365039d0c
commit 2dca485f87
1 changed files with 2 additions and 2 deletions
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4
arch/s390/kvm/priv.c
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@ -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;
}