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hw/xen: Implement EVTCHNOP_unmask

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This finally comes with a mechanism for actually injecting events into
the guest vCPU, with all the atomic-test-and-set that's involved in
setting the bit in the shinfo, then the index in the vcpu_info, and
injecting either the lapic vector as MSI, or letting KVM inject the
bare vector.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Reviewed-by: Paul Durrant <paul@xen.org>
This commit is contained in:
David Woodhouse 2022-12-13 17:20:46 +00:00
parent 83eb581134
commit 190cc3c0ed
3 changed files with 189 additions and 0 deletions
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12
target/i386/kvm/xen-emu.c
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@ -817,6 +817,18 @@ static bool kvm_xen_hcall_evtchn_op(struct kvm_xen_exit *exit, X86CPU *cpu,
err = xen_evtchn_close_op(&close);
break;
}
case EVTCHNOP_unmask: {
struct evtchn_unmask unmask;
qemu_build_assert(sizeof(unmask) == 4);
if (kvm_copy_from_gva(cs, arg, &unmask, sizeof(unmask))) {
err = -EFAULT;
break;
}
err = xen_evtchn_unmask_op(&unmask);
break;
}
default:
return false;
}