On Mon, Jun 18, 2012 at 9:48 AM, Avi Kivity <avi@xxxxxxxxxx> wrote:
> On 06/15/2012 10:09 PM, Christoffer Dall wrote:
>> When the guest accesses I/O memory this will create data abort
>> exceptions and they are handled by decoding the HSR information
>> (physical address, read/write, length, register) and forwarding reads
>> and writes to QEMU which performs the device emulation.
>>
>> Certain classes of load/store operations do not support the syndrome
>> information provided in the HSR and we therefore must be able to fetch
>> the offending instruction from guest memory and decode it manually.
>>
>> This requires changing the general flow somewhat since new calls to run
>> the VCPU must check if there's a pending MMIO load and perform the write
>> after userspace has made the data available.
>>
>>
>> memslot = gfn_to_memslot(vcpu->kvm, gfn);
>> diff --git a/arch/arm/kvm/trace.h b/arch/arm/kvm/trace.h
>> index e474a0a..bd3a6cc 100644
>> --- a/arch/arm/kvm/trace.h
>> +++ b/arch/arm/kvm/trace.h
>> @@ -39,6 +39,27 @@ TRACE_EVENT(kvm_exit,
>> TP_printk("PC: 0x%08lx", __entry->vcpu_pc)
>> );
>>
>> +TRACE_EVENT(kvm_mmio_emulate,
>> + TP_PROTO(unsigned long vcpu_pc, unsigned long instr,
>> + unsigned long cpsr),
>> + TP_ARGS(vcpu_pc, instr, cpsr),
>> +
>> + TP_STRUCT__entry(
>> + __field( unsigned long, vcpu_pc )
>> + __field( unsigned long, instr )
>> + __field( unsigned long, cpsr )
>> + ),
>> +
>> + TP_fast_assign(
>> + __entry->vcpu_pc = vcpu_pc;
>> + __entry->vcpu_pc = instr;
>> + __entry->vcpu_pc = cpsr;
>
> -ECUTANDPASTE
>
hehe, nice, thanks.
-Christoffer
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