On 02/06/2018 01:04 PM, Cornelia Huck wrote:
> On Tue, 6 Feb 2018 11:21:27 +0000
> Christian Borntraeger <borntraeger@xxxxxxxxxx> wrote:
>
>> instead of having huge jump tables for function selection,
>
> s/instead/Instead/
>
>> lets use normal switch/case statements for the instruction
>
> s/lets/let's/
>
>> handlers in intercept.c We can now also get rid of
>> intercept_handler_t.
>>
>> bloat-o-meter output:
>> add/remove: 0/1 grow/shrink: 1/0 up/down: 280/-2048 (-1768)
>> Function old new delta
>> kvm_handle_sie_intercept 1530 1810 +280
>> instruction_handlers 2048 - -2048
>> Total: Before=5227, After=3459, chg -33.82%
>>
>> Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
>> ---
>> arch/s390/kvm/intercept.c | 54 ++++++++++++++++++++++++-----------------------
>> arch/s390/kvm/kvm-s390.h | 2 --
>> 2 files changed, 28 insertions(+), 28 deletions(-)
>>
>
>> @@ -129,16 +113,34 @@ static int handle_validity(struct kvm_vcpu *vcpu)
>>
>> static int handle_instruction(struct kvm_vcpu *vcpu)
>> {
>> - intercept_handler_t handler;
>> -
>> - vcpu->stat.exit_instruction++;
>> - trace_kvm_s390_intercept_instruction(vcpu,
>> - vcpu->arch.sie_block->ipa,
>> - vcpu->arch.sie_block->ipb);
>
> Is dropping the tracing intentional?
nope, its a bug :-)
>
>> - handler = instruction_handlers[vcpu->arch.sie_block->ipa >> 8];
>> - if (handler)
>> - return handler(vcpu);
>> - return -EOPNOTSUPP;
>> + switch (vcpu->arch.sie_block->ipa >> 8) {
>> + case 0x01:
>> + return kvm_s390_handle_01(vcpu);
>> + case 0x82:
>> + return kvm_s390_handle_lpsw(vcpu);
>> + case 0x83:
>> + return kvm_s390_handle_diag(vcpu);
>> + case 0xaa:
>> + return kvm_s390_handle_aa(vcpu);
>> + case 0xae:
>> + return kvm_s390_handle_sigp(vcpu);
>> + case 0xb2:
>> + return kvm_s390_handle_b2(vcpu);
>> + case 0xb6:
>> + return kvm_s390_handle_stctl(vcpu);
>> + case 0xb7:
>> + return kvm_s390_handle_lctl(vcpu);
>> + case 0xb9:
>> + return kvm_s390_handle_b9(vcpu);
>> + case 0xe3:
>> + return kvm_s390_handle_e3(vcpu);
>> + case 0xe5:
>> + return kvm_s390_handle_e5(vcpu);
>> + case 0xeb:
>> + return kvm_s390_handle_eb(vcpu);
>> + default:
>> + return -EOPNOTSUPP;
>> + }
>> }
>>
>
> Else, looks good.
>
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