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Date: Thu, 25 Sep 2008 14:55:10 +0300 From: Avi Kivity <avi@...hat.com> To: linux-kernel@...r.kernel.org Cc: kvm@...r.kernel.org, Christian Borntraeger <borntraeger@...ibm.com> Subject: [PATCH 38/39] KVM: s390: Make facility bits future-proof From: Christian Borntraeger <borntraeger@...ibm.com> 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@...ibm.com> Signed-off-by: Avi Kivity <avi@...ranet.com> --- arch/s390/kvm/priv.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/s390/kvm/priv.c b/arch/s390/kvm/priv.c index d1faf5c..cce40ff 100644 --- a/arch/s390/kvm/priv.c +++ b/arch/s390/kvm/priv.c @@ -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)); -- 1.6.0.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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