Re: [PATCH v11 0/7] Support x2APIC mode with TCG accelerator

[Bui Quang Minh <minhquangbui99@gmail.com>]

On 12/26/23 16:21, Michael S. Tsirkin wrote:
> On Mon, Dec 25, 2023 at 11:40:54PM +0700, Bui Quang Minh wrote:
>> Hi everyone,
>>
>> This series implements x2APIC mode in userspace local APIC and the
>> RDMSR/WRMSR helper to access x2APIC registers in x2APIC mode. Intel iommu
>> and AMD iommu are adjusted to support x2APIC interrupt remapping. With this
>> series, we can now boot Linux kernel into x2APIC mode with TCG accelerator
>> using either Intel or AMD iommu.
>>
>> Testing to boot my own built Linux 6.3.0-rc2, the kernel successfully boot
>> with enabled x2APIC and can enumerate CPU with APIC ID 257
>>
>> Using Intel IOMMU
>>
>> qemu/build/qemu-system-x86_64 \
>>    -smp 2,maxcpus=260 \
>>    -cpu qemu64,x2apic=on \
>>    -machine q35 \
>>    -device intel-iommu,intremap=on,eim=on \
>>    -device qemu64-x86_64-cpu,x2apic=on,core-id=257,socket-id=0,thread-id=0 \
>>    -m 2G \
>>    -kernel $KERNEL_DIR \
>>    -append "nokaslr console=ttyS0 root=/dev/sda earlyprintk=serial net.ifnames=0" \
>>    -drive file=$IMAGE_DIR,format=raw \
>>    -nographic \
>>    -s
>>
>> Using AMD IOMMU
>>
>> qemu/build/qemu-system-x86_64 \
>>    -smp 2,maxcpus=260 \
>>    -cpu qemu64,x2apic=on \
>>    -machine q35 \
>>    -device amd-iommu,intremap=on,xtsup=on \
>>    -device qemu64-x86_64-cpu,x2apic=on,core-id=257,socket-id=0,thread-id=0 \
>>    -m 2G \
>>    -kernel $KERNEL_DIR \
>>    -append "nokaslr console=ttyS0 root=/dev/sda earlyprintk=serial net.ifnames=0" \
>>    -drive file=$IMAGE_DIR,format=raw \
>>    -nographic \
>>    -s
>>
>> Testing the emulated userspace APIC with kvm-unit-tests, disable test
>> device with this patch
> 
> Seems to break build for windows/amd64
> https://gitlab.com/mstredhat/qemu/-/pipelines/1118886361/failures

I saw the CI test "pages" failed too. On my CI, most of the time, it 
failed with

$ htags -anT --tree-view=filetree -m qemu_init -t "Welcome to the QEMU 
sourcecode"
00:24
htags: Negative exec line limit = -8099

It only succeeded once. I could not reproduce locally. Do you have any 
ideas what the problem is?

Thanks,
Quang Minh.