a prototype of irq injection #47
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- Add VGICv2 support for virtual interrupt controller - Integrate VirtIO drivers for block and network devices - Update VM configuration to include VGICv2 and VirtIO devices - Remove unused timer code and mock timer device
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- Add 'clk_ignore_unused' to the first Linux's bootargs so that it will configure but won't disable clocks assigned to the second VM's devices. - Add 'fixed-clock' clock nodes in the second Linux's DTS so that devices which require clocks can be probed properly. Meanwhile, the second Linux cannot mess with these clocks since they are fixed. - Serial port and 1G ethernet are happy with fixed frequency clocks; however MMC controller needs a variable clock to probe a SD card which is hard to implement. So we just boot the second Linux with NFS rootfs.
- Passthrough SATA controller and PHY to VM2 DTS - Keep them in VM1 DTS then VM1 can reset and negotiate properly - Disable SATA drive in VM1's bootargs, so that it won't try accessing the drive and conflict with VM2.
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