David Woodhouse 14243b3871
KVM: x86/xen: Add KVM_IRQ_ROUTING_XEN_EVTCHN and event channel delivery ...
This adds basic support for delivering 2 level event channels to a guest.
Initially, it only supports delivery via the IRQ routing table, triggered
by an eventfd. In order to do so, it has a kvm_xen_set_evtchn_fast()
function which will use the pre-mapped shared_info page if it already
exists and is still valid, while the slow path through the irqfd_inject
workqueue will remap the shared_info page if necessary.
It sets the bits in the shared_info page but not the vcpu_info; that is
deferred to __kvm_xen_has_interrupt() which raises the vector to the
appropriate vCPU.
Add a 'verbose' mode to xen_shinfo_test while adding test cases for this.
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk >
Message-Id: <20211210163625.2886-5-dwmw2@infradead.org >
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com >
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David Woodhouse
14243b3871