Re: [PATCH v3 1/4] KVM: s390: vsie: Fix STFLE interpretive execution identification

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On 11/8/23 18:12, Nina Schoetterl-Glausch wrote:
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")
Reviewed-by: Claudio Imbrenda <imbrenda@xxxxxxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Signed-off-by: Nina Schoetterl-Glausch <nsg@xxxxxxxxxxxxx>
  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;

Switch the retry and the facility assignment.
Add the following comment:

Facility list origin (FLO) is in bits 1 - 28 of the FLD so we need to mask here before reading.

Apart from that this looks fine to me.

  		if (read_guest_real(vcpu, fac, &vsie_page->fac,

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