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KVM: selftests: Fall back to split IRQ chip if full in-kernel chip is unsupported

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Now that KVM x86 allows compiling out support for in-kernel I/O APIC (and
PIC and PIT) emulation, i.e. allows disabling KVM_CREATE_IRQCHIP for all
intents and purposes, fall back to a split IRQ chip for x86 if creating
the full in-kernel version fails with ENOTTY.

Acked-by: Kai Huang <kai.huang@intel.com>
Link: https://lore.kernel.org/r/20250611213557.294358-17-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson
2025-06-11 14:35:55 -07:00
parent 141db6cd79
commit 8fd2a6d43a
1 changed files with 12 additions and 1 deletions
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13
tools/testing/selftests/kvm/lib/kvm_util.c
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@@ -1716,7 +1716,18 @@ void *addr_gpa2alias(struct kvm_vm *vm, vm_paddr_t gpa)
/* Create an interrupt controller chip for the specified VM. */
void vm_create_irqchip(struct kvm_vm *vm)
{
vm_ioctl(vm, KVM_CREATE_IRQCHIP, NULL);
int r;
/*
* Allocate a fully in-kernel IRQ chip by default, but fall back to a
* split model (x86 only) if that fails (KVM x86 allows compiling out
* support for KVM_CREATE_IRQCHIP).
*/
r = __vm_ioctl(vm, KVM_CREATE_IRQCHIP, NULL);
if (r && errno == ENOTTY && kvm_has_cap(KVM_CAP_SPLIT_IRQCHIP))
vm_enable_cap(vm, KVM_CAP_SPLIT_IRQCHIP, 24);
else
TEST_ASSERT_VM_VCPU_IOCTL(!r, KVM_CREATE_IRQCHIP, r, vm);
vm->has_irqchip = true;
}