Il 28/02/2014 05:55, Michael S. Tsirkin ha scritto:
Why?
We already have different ACPI tables for TCG vs KVM.
Specifically apic interrupt override flag in MADT is set
for KVM but not TCG.
It used to be this way, but
bool kvm_allows_irq0_override(void)
{
return !kvm_irqchip_in_kernel() || kvm_has_gsi_routing();
}
means that these days it is usually set for both TCG and KVM.
As KVM hardware differs from TCG, I expect them to move
further apart with time.
I don't expect this, because there are some kind of guests that people
will unknowingly end up running with TCG---for example libguestfs. So
minimizing the differences in hardware between KVM and TCG _is_ a goal.
Or we can do a patch like we did for kvm and ignore polarity,
treating levels as logical rather than physical.
Yes.
Paolo
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