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My changes to qemu for legacy free GPU passthrough
...Only one adapter can use legacy vga regions at same time.
This is an attemp to achieve a qemu gpu passthrough without legacy vga accesses to graphics card.
Legacy io accesses to vga registers are replaced through MMIO accesses.
Legacy accesses to vga memory are replaced through accesses to plain framebuffer.
This avoids vga arbiter problems in linux kernel.
...Xvisor primarily supports Full virtualization hence, supports a wide range of unmodified Guest operating systems. Paravirtualization is optional for Xvisor and will be supported in an architecture independent manner (such as VirtIO PCI/MMIO devices) to ensure no-change in Guest OS for using paravirtualization.