On 2011-03-05 16:37, Marcelo Tosatti wrote:
> On Fri, Mar 04, 2011 at 11:20:00AM +0100, Jan Kiszka wrote:
>> KVM only requires to set the raised IRQ in CPUState and, if the user
>> space irqchip is used, to kick the receiving vcpu if it is remote.
>>
>> Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
>> ---
>> kvm-all.c | 17 +++++++++++++++++
>> 1 files changed, 17 insertions(+), 0 deletions(-)
>>
>> diff --git a/kvm-all.c b/kvm-all.c
>> index 226843c..c460d45 100644
>> --- a/kvm-all.c
>> +++ b/kvm-all.c
>> @@ -650,6 +650,20 @@ static CPUPhysMemoryClient kvm_cpu_phys_memory_client = {
>> .log_stop = kvm_log_stop,
>> };
>>
>> +static void kvm_handle_interrupt(CPUState *env, int mask)
>> +{
>> + env->interrupt_request |= mask;
>> +
>
> If the env->interrupt_request request is processed in userspace, such as
> MCE, the kick is still necessary for irqchip case. CPU_INTERRUPT_DEBUG
> is another example, no?
[this probably targeted kvm_handle_interrupt_kernel_irqchip]
In principle, you are right. But MCE must be injected synchronously over
the target VCPU, see do_inject_x86_mce, and CPU_INTERRUPT_DEBUG is also
synchronous and not even used in KVM mode.
>
>> + if (!qemu_cpu_self(env)) {
>> + qemu_cpu_kick(env);
>> + }
>> +}
>> +
>> +static void kvm_handle_interrupt_kernel_irqchip(CPUState *env, int mask)
>> +{
>> + env->interrupt_request |= mask;
>> +}
>> +
Jan
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