qemu-kvm doesn't work with qemu-x86_64_defconfig

Wed Jul 28 17:22:35 CEST 2021

Hello,

I am trying to build master for qemu-x86_64_defconfig. When I try to
boot u-boot.rom as the following everything works fine:

> qemu-system-x86_64 -nographic -bios u-boot.rom

U-Boot SPL 2021.10-rc1-00027-g22ecb12132 (Jul 28 2021 - 18:18:37 +0300)
Trying to boot from SPI
Jumping to 64-bit U-Boot: Note many features are missing

U-Boot 2021.10-rc1-00027-g22ecb12132 (Jul 28 2021 - 18:18:37 +0300)

CPU:   QEMU Virtual CPU version 2.5+
DRAM:  128 MiB
Loading Environment from nowhere... OK
Incorrect expansion ROM header signature 4daa
Model: QEMU x86 (I440FX)
Net:   e1000: 52:54:00:12:34:56
       eth0: e1000#0
Hit any key to stop autoboot:  0

When I try to enable KVM as the following, the boot process hangs:

> qemu-system-x86_64 -enable-kvm -cpu host -nographic -bios u-boot.rom

U-Boot SPL 2021.10-rc1-00027-g22ecb12132 (Jul 28 2021 - 18:18:37 +0300)
Trying to boot from SPI
Jumping to 64-bit U-Boot: Note many features are missing

What have I missed? Maybe KVM is just not supported?