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KVM_CAP_IRQFD and KVM_CAP_IRQFD_RESAMPLE checks

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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>
This commit is contained in:
Eric Auger 2014-10-31 13:38:18 +00:00 • committed by Paolo Bonzini
parent 9551ea6991
commit f41389ae3c
6 changed files with 17 additions and 4 deletions
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1
target-i386/kvm.c
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@ -2563,7 +2563,6 @@ void kvm_arch_init_irq_routing(KVMState *s)
* irqchip, so we can use irqfds, and on x86 we know
* we can use msi via irqfd and GSI routing.
*/
kvm_irqfds_allowed = true;
kvm_msi_via_irqfd_allowed = true;
kvm_gsi_routing_allowed = true;
}