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KVM: s390: Make facility bits future-proof

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Heiko Carstens pointed out, that its safer to activate working facilities
instead of disabling problematic facilities. The new code uses the host
facility bits and masks it with known good ones.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Christian Borntraeger 2008-08-29 13:29:45 +02:00 committed by Avi Kivity
parent a89c1ad270
commit a0046b6db1
1 changed files with 2 additions and 2 deletions
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4
arch/s390/kvm/priv.c
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@ -157,8 +157,8 @@ static int handle_stfl(struct kvm_vcpu *vcpu)
int rc;
vcpu->stat.instruction_stfl++;
facility_list &= ~(1UL<<24); /* no stfle */
facility_list &= ~(1UL<<23); /* no large pages */
/* only pass the facility bits, which we can handle */
facility_list &= 0xfe00fff3;
rc = copy_to_guest(vcpu, offsetof(struct _lowcore, stfl_fac_list),
&facility_list, sizeof(facility_list));