On 26/04/2019 11:08, Christian Borntraeger wrote:
On 26.04.19 10:56, Pierre Morel wrote:When the guest do not have AP instructions nor Key management we should return without shadowing the CRYCB. We did not check correctly in the past. Fixes: b10bd9a256ae ("s390: vsie: Use effective CRYCBD.31 to check CRYCBD validity") Fixes: 6ee74098201b ("KVM: s390: vsie: allow CRYCB FORMAT-0") Signed-off-by: Pierre Morel <[email protected]> Reported-by: Christian Borntraeger <[email protected]>Tested-by: Christian Borntraeger <[email protected]> Reviewed-by: Christian Borntraeger <[email protected]>
Thanks, It gives a better feeling on this patch. Pierre
--- arch/s390/kvm/vsie.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c index c6983d9..ac411e9 100644 --- a/arch/s390/kvm/vsie.c +++ b/arch/s390/kvm/vsie.c @@ -290,6 +290,7 @@ static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) u8 ecb3_flags; u32 ecd_flags; int apie_h; + int apie_s; int key_msk = test_kvm_facility(vcpu->kvm, 76); int fmt_o = crycbd_o & CRYCB_FORMAT_MASK; int fmt_h = vcpu->arch.sie_block->crycbd & CRYCB_FORMAT_MASK; @@ -298,7 +299,8 @@ static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) scb_s->crycbd = 0;apie_h = vcpu->arch.sie_block->eca & ECA_APIE;- if (!apie_h && (!key_msk || fmt_o == CRYCB_FORMAT0)) + apie_s = apie_h & scb_o->eca; + if (!apie_s && (!key_msk || (fmt_o == CRYCB_FORMAT0))) return 0;if (!crycb_addr)@@ -309,7 +311,7 @@ static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) ((crycb_addr + 128) & PAGE_MASK)) return set_validity_icpt(scb_s, 0x003CU);- if (apie_h && (scb_o->eca & ECA_APIE)) {+ if (apie_s) { ret = setup_apcb(vcpu, &vsie_page->crycb, crycb_addr, vcpu->kvm->arch.crypto.crycb, fmt_o, fmt_h);
-- Pierre Morel Linux/KVM/QEMU in Böblingen - Germany
