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arch, hypervisor: Report KVM IMSIC interrupt IDs

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The RISC-V AIA FDT node currently advertises a fixed riscv,num-ids
value. That can diverge from the interrupt identity count configured by
KVM, which matters for guests running with an emulated IMSIC.

Record the NR_IDS value reported by KVM and expose that value through
the generated device tree. Read back the KVM-selected AIA mode without
forcing an emulation mode.

Assisted-by: OpenAI-Codex:GPT-5

Signed-off-by: wangyf0611 <wangyufeng@iscas.ac.cn>
This commit is contained in:
wangyf0611
2026-05-21 15:47:53 +08:00
committed by Rob Bradford
parent 9c2e2a67cc
commit 649ca23345
3 changed files with 18 additions and 9 deletions
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4
arch/src/riscv64/fdt.rs
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@@ -231,8 +231,8 @@ fn create_aia_node(fdt: &mut FdtWriter, aia_device: &Arc<Mutex<dyn Vaia>>) -> Fd
fdt.property_u32("#interrupt-cells", 0u32)?;
fdt.property_null("interrupt-controller")?;
fdt.property_null("msi-controller")?;
// TODO complete num-ids
fdt.property_u32("riscv,num-ids", 2047u32)?;
let imsic_num_ids = aia_device.lock().unwrap().imsic_num_ids();
fdt.property_u32("riscv,num-ids", imsic_num_ids)?;
fdt.property_u32("phandle", AIA_IMSIC_PHANDLE)?;
let mut irq_cells = Vec::new();