> SeaBIOS has a couple of different methods to accomplish this mode > switching - it can directly switch modes (C16_BIG switch) or it can > use a helper in SMM mode to perform the switch (C16_SMM). The > preferred method is C16_SMM as C16_BIG isn't available in VM86 mode > and it also clobbers the 16bit segment registers.
Hi Kevin, Why does SeaBios use VM86 mode? vtx supports real mode long time ago. C16_SMM is slow because it causes several extra switches between VM and QEMU. I would prefer C16_BIG for better performance. Does SeaBios know if it runs in real mode or VM86 mode? Can SeaBios choose C16_SMM/C16_BIG based on VCPU mode? Thanks, Anthony _______________________________________________ SeaBIOS mailing list SeaBIOS@seabios.org https://mail.coreboot.org/mailman/listinfo/seabios
