Re: [PATCH 05/15] Coalesce userspace/kernel irqchip interrupt injection logic. - Dmitry Eremin-Solenikov

From: Dmitry Eremin-Solenikov <dmitry.baryshkov@siemens.com>
To: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Gleb Natapov <gleb@redhat.com>, kvm@vger.kernel.org
Subject: Re: [PATCH 05/15] Coalesce userspace/kernel irqchip interrupt injection logic.
Date: Wed, 15 Apr 2009 15:58:11 +0400	[thread overview]
Message-ID: <49E5CBD3.6070202@siemens.com> (raw)
In-Reply-To: <49E5CAC4.3030002@siemens.com>

Dmitry Eremin-Solenikov пишет:
> Jan Kiszka пишет:
>> Dmitry Eremin-Solenikov wrote:
>>> Gleb Natapov wrote:
>>>> On Wed, Apr 15, 2009 at 01:30:29PM +0400, Dmitry Eremin-Solenikov 
>>>> wrote:
>>>>> qemu-x86_64 version 0.10.2 running on i386
>>>>> Due to problems with qemu-x86_64 I have to boot the 'host' kernel
>>>>> with 'noapic'.
>>>> Do you mean boot 'guest' kernel with noapic? The guest is what runs
>>>> inside qemu. So you are able to boot guest with 'noapic'?
>>>>
>>>> What is the command line you are using.
>>> Well, since this caused lot's of questions, here is my setup:
>>>
>>> Main host: Debian squeeze, kernel 2.6.28 or .29 (doesn't matter),
>>> qemu-system-x86_64 version 0.10.2
>>>
>>> KVM kernel run inside qemu: e3dbe3f408a46a045012f1882e9f62b27b8a616c
>>> from Avi's tree (KVM: x86 emulator: fix call near emulation) + these
>>> patches. I have to boot the kernels (both this kernel and 2.6.26 from
>>> debian) with noapic to w/around APIC problems (I dunno if it's qemu or
>>> bochsbios problem).
>>
>> And the bios you are using with 0.10.2 is from 0.10.2 (when in doubt,
>> specify explicitly with -bios and/or -L)? Then this would be a QEMU
>> upstream bug.
> 
> Indeed, there seem to be problems with upstream qemu bios. I was using
> the image from the debian's bochsbios package. I asked qemu to use the 
> bios from 0.10.2 release and got slightly different messages. Attached
> the kernel log
> 

Moreover, using bios from 0.10.2 I can't boot linux even with noapic:
ACPI: PM-Timer IO Port: 0xb008
ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
ACPI: Skipping IOAPIC probe due to 'noapic' option.
Using ACPI for processor (LAPIC) configuration information
ACPI: HPET id: 0x8086a201 base: 0xfed00000
Intel MultiProcessor Specification v1.4
MPTABLE: OEM ID: QEMUCPU
MPTABLE: Product ID: 0.1
MPTABLE: APIC at: 0xFEE00000
I/O APIC #1 Version 17 at 0xFEC00000.
Processors: 1
SMP: Allowing 1 CPUs, 0 hotplug CPUs
Allocating PCI resources starting at 20000000 (gap: 10000000:effc0000)
NR_CPUS:8 nr_cpumask_bits:8 nr_cpu_ids:1 nr_node_ids:1
PERCPU: Embedded 25 pages at ffff880001033000, static data 70880 bytes
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 62771
Kernel command line: root=/dev/sda1 ro console=ttyS0 noapic
Initializing CPU#0
NR_IRQS:512
PID hash table entries: 1024 (order: 10, 8192 bytes)
Fast TSC calibration using PIT
Detected 1828.371 MHz processor.
Console: colour VGA+ 80x25
console [ttyS0] enabled
Dentry cache hash table entries: 32768 (order: 6, 262144 bytes)
Inode-cache hash table entries: 16384 (order: 5, 131072 bytes)
Checking aperture...
No AGP bridge found
Memory: 249848k/262080k available (4048k kernel code, 388k absent, 
11528k reserved, 1626k data, 436k init)
SLUB: Genslabs=13, HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
Calibrating delay loop (skipped), value calculated using timer 
frequency.. 3656.74 BogoMIPS (lpj=7313484)
Mount-cache hash table entries: 256
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 512K (64 bytes/line)
SMP alternatives: switching to UP code
Freeing SMP alternatives: 29k freed
ACPI: Core revision 20081204
ACPI: setting ELCR to 0200 (from 0a00)
Setting APIC routing to flat
CPU0: AMD QEMU Virtual CPU version 0.10.2 stepping 03

And after that qemu stalls.

-- 
With best wishes
Dmitry