On Sun, Dec 22, 2019 at 10:34:55AM +0000, Marc Zyngier wrote: > On Fri, 20 Dec 2019 14:30:17 +0000, > Andrew Murray <andrew.murray@xxxxxxx> wrote: > > > > From: Sudeep Holla <sudeep.holla@xxxxxxx> > > > > Now that we have all the save/restore mechanism in place, lets enable > > the translation regime used by buffer from EL2 stage 1 to EL1 stage 1 > > on VHE systems. > > > > Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx> > > [ Reword commit, don't trap to EL2 ] > > Not trapping to EL2 for the case where we don't allow SPE in the > guest is not acceptable. Yes understood (because of this I had meant to send the series as RFC btw). > > > Signed-off-by: Andrew Murray <andrew.murray@xxxxxxx> > > --- > > arch/arm64/kvm/hyp/switch.c | 2 ++ > > 1 file changed, 2 insertions(+) > > > > diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c > > index 67b7c160f65b..6c153b79829b 100644 > > --- a/arch/arm64/kvm/hyp/switch.c > > +++ b/arch/arm64/kvm/hyp/switch.c > > @@ -100,6 +100,7 @@ static void activate_traps_vhe(struct kvm_vcpu *vcpu) > > > > write_sysreg(val, cpacr_el1); > > > > + write_sysreg(vcpu->arch.mdcr_el2 | 3 << MDCR_EL2_E2PB_SHIFT, mdcr_el2); > > write_sysreg(kvm_get_hyp_vector(), vbar_el1); > > } > > NOKPROBE_SYMBOL(activate_traps_vhe); > > @@ -117,6 +118,7 @@ static void __hyp_text __activate_traps_nvhe(struct kvm_vcpu *vcpu) > > __activate_traps_fpsimd32(vcpu); > > } > > > > + write_sysreg(vcpu->arch.mdcr_el2 | 3 << MDCR_EL2_E2PB_SHIFT, mdcr_el2); > > There is a _MASK macro that can replace this '3', and is in keeping > with the rest of the code. OK. > > It still remains that it looks like the wrong place to do this, and > vcpu_load seems much better. Why should you write to mdcr_el2 on each > entry to the guest, since you know whether it has SPE enabled at the > point where it gets scheduled? Yes OK, I'll move what I can to vcpu_load. Thanks, Andrew Murray > > M. > > -- > Jazz is not dead, it just smells funny.
