On 06/05/2013 11:34 PM, Gleb Natapov wrote: >> >> SeaBIOS runs the virtio code in 32-bit mode with a flat memory layout. >> There are loads of ASSERT32FLAT()s in the code to make sure of this. >> > Well, not exactly. Initialization is done in 32bit, but disk > reads/writes are done in 16bit mode since it should work from int13 > interrupt handler. The only way I know to access MMIO bars from 16 bit > is to use SMM which we do not have in KVM. > In some ways it is even worse for PXE, since PXE is defined to work from 16-bit protected mode... but the mechanism to request a segment mapping for the high memory area doesn't actually work. -hpa _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
