Messages in this thread Patch in this message | | | From | Nina Schoetterl-Glausch <> | Subject | [PATCH 1/4] KVM: s390: vsie: Fix STFLE interpretive execution identification | Date | Fri, 3 Nov 2023 18:30:05 +0100 |
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STFLE can be interpretively executed. This occurs when the facility list designation is unequal to zero. Perform the check before applying the address mask instead of after.
Fixes: 66b630d5b7f2 ("KVM: s390: vsie: support STFLE interpretation") Signed-off-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com> --- arch/s390/kvm/vsie.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c index 61499293c2ac..d989772fe211 100644 --- a/arch/s390/kvm/vsie.c +++ b/arch/s390/kvm/vsie.c @@ -988,9 +988,10 @@ static void retry_vsie_icpt(struct vsie_page *vsie_page) static int handle_stfle(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) { struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; - __u32 fac = READ_ONCE(vsie_page->scb_o->fac) & 0x7ffffff8U; + __u32 fac = READ_ONCE(vsie_page->scb_o->fac); if (fac && test_kvm_facility(vcpu->kvm, 7)) { + fac = fac & 0x7ffffff8U; retry_vsie_icpt(vsie_page); if (read_guest_real(vcpu, fac, &vsie_page->fac, sizeof(vsie_page->fac))) -- 2.39.2
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