@@ -1687,20 +1687,18 @@ static int kvm_handle_cp_64(struct kvm_vcpu *vcpu,
params.regval |= vcpu_get_reg(vcpu, Rt2) << 32;
}
- if (!emulate_cp(vcpu, ¶ms, target_specific, nr_specific))
- goto out;
- if (!emulate_cp(vcpu, ¶ms, global, nr_global))
- goto out;
-
- unhandled_cp_access(vcpu, ¶ms);
+ if (!emulate_cp(vcpu, ¶ms, target_specific, nr_specific) ||
+ !emulate_cp(vcpu, ¶ms, global, nr_global)) {
+ /* Split up the value between registers for the read side */
+ if (!params.is_write) {
+ vcpu_set_reg(vcpu, Rt, lower_32_bits(params.regval));
+ vcpu_set_reg(vcpu, Rt2, upper_32_bits(params.regval));
+ }
-out:
- /* Split up the value between registers for the read side */
- if (!params.is_write) {
- vcpu_set_reg(vcpu, Rt, lower_32_bits(params.regval));
- vcpu_set_reg(vcpu, Rt2, upper_32_bits(params.regval));
+ return 1;
}
+ unhandled_cp_access(vcpu, ¶ms);
return 1;
}
If we fail to emulate a mrrc instruction, we: 1) deliver an exception, 2) spit a nastygram on the console, 3) write back some garbage to Rt/Rt2 While 1) and 2) are perfectly acceptable, 3) is out of the scope of the architecture... Let's mimick the code in kvm_handle_cp_32 and be more cautious. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> --- arch/arm64/kvm/sys_regs.c | 20 +++++++++----------- 1 file changed, 9 insertions(+), 11 deletions(-)