KVM_CAP_IRQFD and KVM_CAP_IRQFD_RESAMPLE checks

Compute kvm_irqfds_allowed by checking the KVM_CAP_IRQFD extension.
Remove direct settings in architecture specific files.

Add a new kvm_resamplefds_allowed variable, initialized by
checking the KVM_CAP_IRQFD_RESAMPLE extension. Add a corresponding
kvm_resamplefds_enabled() function.

A special notice for s390 where KVM_CAP_IRQFD was not immediatly
advirtised when irqfd capability was introduced in the kernel.
KVM_CAP_IRQ_ROUTING was advertised instead.

This was fixed in "KVM: s390: announce irqfd capability",
ebc3226202d5956a5963185222982d435378b899 whereas irqfd support
was brought in 84223598778ba08041f4297fda485df83414d57e,
"KVM: s390: irq routing for adapter interrupts".  Both commits
first appear in 3.15 so there should not be any kernel
version impacted by this QEMU modification.

Signed-off-by: Eric Auger <eric.auger@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 0 insertions, 1 deletions

diff --git a/hw/intc/xics_kvm.c b/hw/intc/xics_kvm.c
index 20b19e9d4f..c15453f26f 100644
--- a/hw/intc/xics_kvm.c
+++ b/hw/intc/xics_kvm.c
@@ -448,7 +448,6 @@ static void xics_kvm_realize(DeviceState *dev, Error **errp)
     }
 
     kvm_kernel_irqchip = true;
-    kvm_irqfds_allowed = true;
     kvm_msi_via_irqfd_allowed = true;
     kvm_gsi_direct_mapping = true;