KVM: arm64: nv: Filter out unsupported features from ID regs
As there is a number of features that we either can't support,
or don't want to support right away with NV, let's add some
basic filtering so that we don't advertize silly things to the
EL2 guest.
Whilst we are at it, advertize FEAT_TTL as well as FEAT_GTG, which
the NV implementation will implement.
Reviewed-by: Ganapatrao Kulkarni <gankulkarni@os.amperecomputing.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230209175820.1939006-18-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index f5dd4f4..82c1f8d 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1223,6 +1223,9 @@ static bool access_id_reg(struct kvm_vcpu *vcpu,
return write_to_read_only(vcpu, p, r);
p->regval = read_id_reg(vcpu, r);
+ if (vcpu_has_nv(vcpu))
+ access_nested_id_reg(vcpu, p, r);
+
return true;
}
