forked from luck/tmp_suning_uos_patched
KVM: s390: Make facility bits future-proof
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>
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@ -157,8 +157,8 @@ static int handle_stfl(struct kvm_vcpu *vcpu)
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int rc;
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vcpu->stat.instruction_stfl++;
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facility_list &= ~(1UL<<24); /* no stfle */
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facility_list &= ~(1UL<<23); /* no large pages */
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/* only pass the facility bits, which we can handle */
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facility_list &= 0xfe00fff3;
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rc = copy_to_guest(vcpu, offsetof(struct _lowcore, stfl_fac_list),
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&facility_list, sizeof(facility_list));
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