Re: [Qemu-devel] [PATCH v4 2/8] apic: add send_msi() to APICCommonClass

["Radim Krčmář" <rkrcmar@redhat.com>]

2016-10-08 14:37+0800, Peter Xu:
> On Wed, Oct 05, 2016 at 03:06:51PM +0200, Radim Krčmář wrote:
>> The MMIO based interface to APIC doesn't work well with MSIs that have
>> upper address bits set (remapped x2APIC MSIs).  A specialized interface
>> is a quick and dirty way to avoid the shortcoming.
>> 
>> Reviewed-by: Igor Mammedov <imammedo@redhat.com>
>> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
> 
> Reviewed-by: Peter Xu <peterx@redhat.com>

Thanks.

>> ---
>> v4: r-b Igor
>> v2: change apic_send_msi() to accept MSIMessage [Igor]
>> ---
>>  hw/i386/kvm/apic.c              | 19 +++++++++++++------
>>  hw/i386/xen/xen_apic.c          |  6 ++++++
>>  hw/intc/apic.c                  |  8 ++++++--
>>  include/hw/i386/apic_internal.h |  4 ++++
>>  4 files changed, 29 insertions(+), 8 deletions(-)
>> 
>> diff --git a/hw/i386/kvm/apic.c b/hw/i386/kvm/apic.c
>> index c016e63fc2ba..be55102c00ca 100644
>> --- a/hw/i386/kvm/apic.c
>> +++ b/hw/i386/kvm/apic.c
>> @@ -169,6 +169,17 @@ static void kvm_apic_external_nmi(APICCommonState *s)
>>      run_on_cpu(CPU(s->cpu), do_inject_external_nmi, s);
>>  }
>>  
>> +static void kvm_send_msi(MSIMessage *msg)
>> +{
>> +    int ret;
>> +
>> +    ret = kvm_irqchip_send_msi(kvm_state, *msg);
>> +    if (ret < 0) {
>> +        fprintf(stderr, "KVM: injection failed, MSI lost (%s)\n",
>> +                strerror(-ret));
> 
> Maybe use error_report() better? A nit not sufficient for a new spin
> though.

Yes, but it is a separate logical change, so I'd do that in a separate
cleaup patch that amends it in the whole file ...
(And I prefer to copy-paste code verbatim.)

> And, this patch is assuming MSIMessage as host endianess (which is
> good to me). Not sure whether we need fixes for the whole MSIMessage
> cleanup (after all, kvm_irqchip_send_msi() is taking it as LE). Or we
> can do it afterwards since it won't break anything AFAIU.

This patch doesn't affect existing callers, and IR known to be broken,
so I think we can sort endianess out later ...