hw/riscv/virt-acpi-build: Fix RINTC PLIC context ID for KVM

Each RISC-V MADT RINTC entry contains an External Interrupt Controller ID field. On the virt machine without AIA, this field identifies the S-mode PLIC context associated with the hart. TCG virt has both M-mode and S-mode PLIC contexts, so the S-mode context ID is odd and 2 * local_cpu_id + 1 is correct. KVM virt exposes only S-mode PLIC contexts, and those contexts are numbered contiguously from 0. Reporting the TCG context ID for KVM makes the guest enable a different PLIC context from the one used by QEMU. With ACPI enabled, this can leave PCI INTx interrupts pending in QEMU while the guest-programmed PLIC context remains disabled. A virtio-blk root disk can then stall during boot because its first interrupt is never delivered. Use local_cpu_id for KVM and keep the existing odd S-mode context ID for TCG. Fixes: d641da6ed43 ("hw/riscv/virt-acpi-build.c: Add PLIC in MADT") Signed-off-by: Qingwei Hu <qingwei.hu@bytedance.com> Reviewed-by: Nutty Liu <nutty.liu@hotmail.com> Reviewed-by: Sunil V L <sunilvl@oss.qualcomm.com> Message-ID: <20260604120017.398890-1-qingwei.hu@bytedance.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>