Re: [Qemu-devel] [PATCH v12 2/5] apic: use per CPU AS to map APIC MMIO for TCG

[Eduardo Habkost]

On Tue, Sep 22, 2015 at 02:29:01PM +0200, Igor Mammedov wrote:
> On Wed, 16 Sep 2015 17:19:12 +0800
> Zhu Guihua <address@hidden> wrote:
> 
> > TCG supports per CPU address space, and the emulation quality is
> > a bit better with it.
> > So use per CPU address space to map APIC MMIO area. This allows the
> > APIC base address of each cpu to be moved independent of others.
> > 
> > Signed-off-by: Zhu Guihua <address@hidden>
> 
> Reviewed-by: Igor Mammedov <address@hidden>

The series seems to be OK when using KVM, but something is wrong with TCG.

After applying this patch, my Fedora 20 image hangs on boot at:

[  OK  ] Started udev Coldplug all Devices.
         Starting dracut initqueue hook...
[  OK  ] Reached target System Initialization.
[  OK  ] Reached target Basic System.
[    8.988420] ACPI: PCI Interrupt Link [LNKD] enabled at IRQ 11


Before this patch, boot continues with:

[  OK  ] Reached target Basic System.
[    8.523293] ACPI: PCI Interrupt Link [LNKD] enabled at IRQ 11
[    9.230955]  vda: vda1
[  OK  ] Started dracut initqueue hook.
         Mounting /sysroot...

I am running QEMU as:
  $ ./x86_64-softmmu/qemu-system-x86_64 -drive 
if=virtio,file=/home/ehabkost/system/vmachines/Fedora-x86_64-20-20131211.1-sda.qcow2,format=qcow2
 -machine pc,accel=tcg  -smp 8,sockets=2,threads=2,cores=2,maxcpus=16 -serial 
stdio -nographic -monitor none

-- 
Eduardo