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authorEric Auger <eric.auger@linaro.org>2014-10-31 13:38:18 +0000
committerPaolo Bonzini <pbonzini@redhat.com>2014-12-15 12:21:01 +0100
commitf41389ae3c54bd5e2040e3f95a2872981c3ed965 (patch)
tree212d9e2c0a1d7e130a526b66ad10b6edc585284a /kvm-all.c
parent9551ea6991cfb7c777f7943ad69b30d0a4fadac3 (diff)
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>
Diffstat (limited to 'kvm-all.c')
-rw-r--r--kvm-all.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/kvm-all.c b/kvm-all.c
index 937bc9d903..c86626f9ff 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -120,6 +120,7 @@ bool kvm_async_interrupts_allowed;
bool kvm_halt_in_kernel_allowed;
bool kvm_eventfds_allowed;
bool kvm_irqfds_allowed;
+bool kvm_resamplefds_allowed;
bool kvm_msi_via_irqfd_allowed;
bool kvm_gsi_routing_allowed;
bool kvm_gsi_direct_mapping;
@@ -1584,6 +1585,12 @@ static int kvm_init(MachineState *ms)
kvm_eventfds_allowed =
(kvm_check_extension(s, KVM_CAP_IOEVENTFD) > 0);
+ kvm_irqfds_allowed =
+ (kvm_check_extension(s, KVM_CAP_IRQFD) > 0);
+
+ kvm_resamplefds_allowed =
+ (kvm_check_extension(s, KVM_CAP_IRQFD_RESAMPLE) > 0);
+
ret = kvm_arch_init(s);
if (ret < 0) {
goto err;