I disabled kvmvapic by diff --git a/hw/intc/apic_common.c b/hw/intc/apic_common.c index c3829e3..52be2b0 100644 --- a/hw/intc/apic_common.c +++ b/hw/intc/apic_common.c @@ -440,7 +440,7 @@ static const VMStateDescription vmstate_apic_common = { static Property apic_properties_common[] = { DEFINE_PROP_UINT8("version", APICCommonState, version, 0x14), DEFINE_PROP_BIT("vapic", APICCommonState, vapic_control, VAPIC_ENABLE_BIT, - true), + false), DEFINE_PROP_BOOL("legacy-instance-id", APICCommonState, legacy_instance_id, false), DEFINE_PROP_END_OF_LIST(),
Tried to boot centos guest with this command ./x86_64-softmmu/qemu-system-x86_64 -bios /home/root/guest/seabios.bin -machine q35 -m 1G -drive format=raw,file=/home/root/images/centos7.2.img,if=ide,index=0 -nographic -nodefaults -serial pty -monitor pty -chardev stdio,id=seabios -device isa-debugcon,iobase=0x402,chardev=seabios Seabios complained Seabios output " Booting from Hard Disk... WARNING - Timeout at ahci_command:154! Boot failed: could not read the boot disk enter handle_18: NULL Booting from Floppy... Boot failed: could not read the boot disk enter handle_18: NULL No bootable device. " It can boot with kvmvapic enabled by using the same command. Seabios output " Booting from Hard Disk... Booting from 0000:7c00 " In the original commit, " Therefore, the VAPI is enabled by default, even in TCG mode. Here, no speedup can be achieved as the emulation overhead of the TPR register is marginal compared to instruction emulation." Seems no performance benefit for TCG mode What's the other benefit of using kvmvapic in TCG mode? Should we make TCG mode work without kvmvapic? If we don't need to use kvmvapic in TCG mode, we can make kvmvapic code clearer by removing all TCG related code in kvmvapic.c. Anthony