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kvm: require KVM_CAP_SIGNAL_MSI

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This was introduced in KVM in Linux 3.5, we can require it unconditionally
in kvm_irqchip_send_msi().  However, not all architectures have to implement
it so check it only in x86, the only architecture that ever had MSI injection
but not KVM_CAP_SIGNAL_MSI.

ARM uses it to detect the presence of the ITS emulation in the kernel,
introduced in Linux 4.8.  Assume that it's there and possibly fail when
realizing the arm-its-kvm device.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2023-10-17 13:24:33 +02:00
parent aacec9aee1
commit cc5e719e2c
6 changed files with 9 additions and 108 deletions
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3
hw/intc/arm_gicv3_its_common.c
View file

@ -163,8 +163,7 @@ type_init(gicv3_its_common_register_types)
const char *its_class_name(void)
{
if (kvm_irqchip_in_kernel()) {
/* KVM implementation requires this capability */
return kvm_direct_msi_enabled() ? "arm-its-kvm" : NULL;
return "arm-its-kvm";
} else {
/* Software emulation based model */
return "arm-gicv3-its";