[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [kvm-devel] [Qemu-devel] [PATCH 3/4] Add support for HPET periodic t
From: |
Avi Kivity |
Subject: |
Re: [kvm-devel] [Qemu-devel] [PATCH 3/4] Add support for HPET periodic timer. |
Date: |
Wed, 22 Aug 2007 10:03:32 +0300 |
User-agent: |
Thunderbird 2.0.0.5 (X11/20070719) |
Dan Kenigsberg wrote:
> On Tue, Aug 21, 2007 at 01:15:22PM -0700, Matthew Kent wrote:
>
>> On Tue, 2007-21-08 at 21:40 +0200, Luca wrote:
>>
>>> On 8/21/07, Matthew Kent <address@hidden> wrote:
>>>
>>>> On Sat, 2007-18-08 at 01:11 +0200, Luca Tettamanti wrote:
>>>>
>>>>> plain text document attachment (clock-hpet)
>>>>> Linux operates the HPET timer in legacy replacement mode, which means that
>>>>> the periodic interrupt of the CMOS RTC is not delivered (qemu won't be
>>>>> able
>>>>> to use /dev/rtc). Add support for HPET (/dev/hpet) as a replacement for
>>>>> the
>>>>> RTC; the periodic interrupt is delivered via SIGIO and is handled in the
>>>>> same way as the RTC timer.
>>>>>
>>>>> Signed-off-by: Luca Tettamanti <address@hidden>
>>>>>
>>>> I must be missing something silly here.. should I be able to open more
>>>> than one instance of qemu with -clock hpet? Because upon invoking a
>>>> second instance of qemu HPET_IE_ON fails.
>>>>
>>> It depends on your hardware. Theoretically it's possible, but I've yet
>>> to see a motherboard with more than one periodic timer.
>>>
>> Ah thank you, after re-reading the docs I think I better understand
>> this.
>>
>
> In a risk of being off-topic, maybe you can help me try the hpet support.
> When I try the hpet Documentation demo I get
>
> # ./hpet poll /dev/hpet 1 1000
> -hpet: executing poll
> hpet_poll: info.hi_flags 0x0
> hpet_poll, HPET_IE_ON failed
>
> while I have
>
> $ dmesg|grep -i HPET
> ACPI: HPET 7D5B6AE0, 0038 (r1 A M I OEMHPET 5000708 MSFT 97)
> ACPI: HPET id: 0x8086a301 base: 0xfed00000
> hpet0: at MMIO 0xfed00000, IRQs 2, 8, 0, 0
> hpet0: 4 64-bit timers, 14318180 Hz
> hpet_resources: 0xfed00000 is busy
> Time: hpet clocksource has been installed.
>
> Any idea what I am misconfiguring?
>
Maybe the kernel is using the timer, so userspace can't. Just a guess.
--
Do not meddle in the internals of kernels, for they are subtle and quick to
panic.
- [Qemu-devel] [PATCH 0/4] Rework alarm timer infrastrucure - take 2, Luca Tettamanti, 2007/08/17
- [Qemu-devel] [PATCH 1/4] Rework alarm timer infrastrucure., Luca Tettamanti, 2007/08/17
- [Qemu-devel] [PATCH 3/4] Add support for HPET periodic timer., Luca Tettamanti, 2007/08/17
- Re: [Qemu-devel] [PATCH 3/4] Add support for HPET periodic timer., Matthew Kent, 2007/08/21
- Re: [Qemu-devel] [PATCH 3/4] Add support for HPET periodic timer., Luca, 2007/08/21
- Re: [Qemu-devel] [PATCH 3/4] Add support for HPET periodic timer., Matthew Kent, 2007/08/21
- Re: [kvm-devel] [Qemu-devel] [PATCH 3/4] Add support for HPET periodic timer., Dan Kenigsberg, 2007/08/22
- Re: [kvm-devel] [Qemu-devel] [PATCH 3/4] Add support for HPET periodic timer.,
Avi Kivity <=
- Re: [kvm-devel] [Qemu-devel] [PATCH 3/4] Add support for HPET periodic timer., Andi Kleen, 2007/08/22
- Re: [kvm-devel] [Qemu-devel] [PATCH 3/4] Add support for HPET periodic timer., Dan Kenigsberg, 2007/08/22
- Re: [kvm-devel] [Qemu-devel] [PATCH 3/4] Add support for HPET periodic timer., Andi Kleen, 2007/08/22
- Re: [kvm-devel] [Qemu-devel] [PATCH 3/4] Add support for HPET periodic timer., Dan Kenigsberg, 2007/08/23
- Re: [kvm-devel] [Qemu-devel] [PATCH 3/4] Add support for HPET periodic timer., Luca, 2007/08/24
- Re: [kvm-devel] [Qemu-devel] [PATCH 3/4] Add support for HPET periodic timer., Dan Kenigsberg, 2007/08/25
[Qemu-devel] [PATCH 4/4] Add support for dynamic ticks., Luca Tettamanti, 2007/08/17
[Qemu-devel] [PATCH 2/4] Add -clock option., Luca Tettamanti, 2007/08/17
Re: [Qemu-devel] [PATCH 0/4] Rework alarm timer infrastrucure - take 2, Christian MICHON, 2007/08/17