The comment preceding the shadow_crycb function is misleading, we effectively accept FORMAT2 CRYCB in the guest. When using FORMAT2 in the host we do not need to or with FORMAT1. Signed-off-by: Pierre Morel <pmorel@xxxxxxxxxxxxx> --- arch/s390/kvm/vsie.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c index 38ea5da..e0e6fbf 100644 --- a/arch/s390/kvm/vsie.c +++ b/arch/s390/kvm/vsie.c @@ -140,7 +140,8 @@ static int prepare_cpuflags(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) * Create a shadow copy of the crycb block and setup key wrapping, if * requested for guest 3 and enabled for guest 2. * - * We only accept format-1 (no AP in g2), but convert it into format-2 + * We accept format-1 or format-2, but we treat it as a format-1 (no AP in g2), + * and we convert it into format-2 in the shadow CRYCB. * There is nothing to do for format-0. * * Returns: - 0 if shadowed or nothing to do @@ -179,8 +180,7 @@ static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) return set_validity_icpt(scb_s, 0x0035U); scb_s->ecb3 |= ecb3_flags; - scb_s->crycbd = ((__u32)(__u64) &vsie_page->crycb) | CRYCB_FORMAT1 | - CRYCB_FORMAT2; + scb_s->crycbd = ((__u32)(__u64) &vsie_page->crycb) | CRYCB_FORMAT2; /* xor both blocks in one run */ b1 = (unsigned long *) vsie_page->crycb.dea_wrapping_key_mask; -- 2.7.4
