This is a proposal for PC System Flash emulation for on QEMU/KVM.

Flash Hardware

Leverage the pre-existing CFI flash support in qemu/hw/pflash_cfi01.c. (Another option is to use qemu/hw/pflash_cfi02.c.)

Command line interface

Usage of -bios and -pflash parameters as of pc-1.1:

KVM enabled	-pflash used	-bios used	Result
No	Yes	-	-pflash parameter will be loaded as flash image just below 4GB. 'bios.bin' and -bios parameter will be ignored.
	No	No	'bios.bin' will be used to create a read-only pflash drive. A flash device is available, but it is read-only.
	No	Yes	-bios parameter will be used to create a read-only pflash drive. A flash device is available, but it is read-only.
Yes	Yes	-	An error message condition: PC system firmware (pflash) not available
	No	No	'bios.bin' will be loaded as rom image. No system flash is available.
	No	Yes	-bios parameter filename will be loaded as rom image. No system flash is available.

KVM will not boot if -pflash is used and -bios is not used. KVM currently only functions with this support if code is not attempting to run from the emulated flash. This issue does not affect QEMU.