From ca82180603446831187203383de4b5ede4e2c346 Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Wed, 17 Mar 2010 13:07:54 +0200 Subject: kvm: add API to set ioeventfd Comment on kvm usage: rather than require users to do if (kvm_enabled()) and/or ifdefs, this patch adds an API that, internally, is defined to stub function on non-kvm build, and checks kvm_enabled for non-kvm run. While rest of qemu code still uses if (kvm_enabled()), I think this approach is cleaner, and we should convert rest of code to it long term. Signed-off-by: Michael S. Tsirkin Signed-off-by: Anthony Liguori --- kvm-all.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'kvm-all.c') diff --git a/kvm-all.c b/kvm-all.c index 40b5a51..6324635 100644 --- a/kvm-all.c +++ b/kvm-all.c @@ -1151,3 +1151,25 @@ int kvm_set_signal_mask(CPUState *env, const sigset_t *sigset) return r; } + +#ifdef KVM_IOEVENTFD +int kvm_set_ioeventfd_pio_word(int fd, uint16_t addr, uint16_t val, bool assign) +{ + struct kvm_ioeventfd kick = { + .datamatch = val, + .addr = addr, + .len = 2, + .flags = KVM_IOEVENTFD_FLAG_DATAMATCH | KVM_IOEVENTFD_FLAG_PIO, + .fd = fd, + }; + int r; + if (!kvm_enabled()) + return -ENOSYS; + if (!assign) + kick.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN; + r = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &kick); + if (r < 0) + return r; + return 0; +} +#endif -- cgit v1.1