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Daniel Henrique Barboza
c2fa432080
The RISC-V Server Platform specification [1] defines a standardized set of hardware and software capabilities, that portable system software, such as OS and hypervisors can rely on being present in a RISC-V server platform. The main features included in this emulation are: - Based on riscv virt machine type; - A new memory map as close as virt machine as possible; - An always present IOMMU platform device (riscv-iommu-sys) that uses IRQs 36 to 39, one IRQ for queue, similar to the 'virt' board; - AIA; - No default AHCI (can be added via command line); - No default NIC (can be added via command line); - No virtio device; - No fw_cfg device; - No ACPI table provided; - Only minimal device tree nodes; - a platform bus for TPM support. A note about TPM support: TPM devices in QEMU comes usually in two flavors - emulated or passthrough. A passthrough device requires a host TPM device that the QEMU process can borrow and it's usually coupled with KVM acceleration. To use the TPM emulator we'll need help from an external TPM emulator called swtpm. More info can be found in [2]. For our purposes this is a process that, if running Ubuntu, can be installed via 'swtpm' package. We'll go back to it shortly. For now, adding support for the emulated TPM device 'tpm-tis' (other TPM flavors might work as well, 'tpm-tis' is the one tested with this work) requires a platform bus. Adding a platform bus will open the door for more devices to be added in the board. This is ok - a reference board isn't a restricted board and users are free to add devices at their leisure. Here's how to use tpm-tis with the riscv-server-ref board: - in a separated shell/term run 'swtpm' (--log is optional): $ mkdir /tmp/mytpm1 $ swtpm socket --tpmstate dir=/tmp/mytpm1 \ --ctrl type=unixio,path=/tmp/mytpm1/swtpm-sock \ --tpm2 \ --log level=20 Then start QEMU with: $ qemu-system-riscv64 -M riscv-server-ref (...) \ -chardev socket,id=chrtpm,path=/tmp/mytpm1/swtpm-sock \ -tpmdev emulator,id=tpm0,chardev=chrtpm\ -device tpm-tis-device,tpmdev=tpm0 [1] https://github.com/riscv-non-isa/riscv-server-platform [2] https://qemu-project.gitlab.io/qemu/specs/tpm.html Signed-off-by: Daniel Henrique Barboza <daniel.barboza@oss.qualcomm.com> Reviewed-by: Nutty Liu <nutty.liu@hotmail.com> Reviewed-by: Chao Liu <chao.liu@processmission.com> Reviewed-by: Sunil V L <sunilvl@oss.qualcomm.com> Reviewed-by: Andrew Jones <andrew.jones@oss.qualcomm.com> Acked-by: Alistair Francis <alistair.francis@wdc.com> Message-ID: <20260928201107.2049458-4-daniel.barboza@oss.qualcomm.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>