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vmm: Add acpi table for fw_cfg device

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This allows the fw_cfg device to be recognized by the guest linux
kernel. This becomes more relavnt in the following cl where I add
the option to load files into the guest via fw_cfg. The Linux kernel
already has a fw_cfg driver that will automatically load these files
under /sys when CONFIG_FW_CFG_SYSFS is enabled in the kernel config

For arm we must add fw_cfg to the devices tree

Signed-off-by: Alex Orozco <alexorozco@google.com>
This commit is contained in:
Alex Orozco
2025-05-19 21:38:21 +00:00
committed by Bo Chen
parent edee53ac1a
commit 971f552e09
6 changed files with 69 additions and 5 deletions
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2
devices/src/legacy/fw_cfg.rs
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@@ -91,6 +91,8 @@ const FW_CFG_KNOWN_ITEMS: usize = 0x20;
pub const FW_CFG_FILE_FIRST: u16 = 0x20;
pub const FW_CFG_DMA_SIGNATURE: [u8; 8] = *b"QEMU CFG";
// https://github.com/torvalds/linux/blob/master/include/uapi/linux/qemu_fw_cfg.h
pub const FW_CFG_ACPI_ID: &str = "QEMU0002";
// Reserved (must be enabled)
const FW_CFG_F_RESERVED: u8 = 1 << 0;
// DMA Toggle Bit (enabled by default)