From: Avi Kivity <avi@redhat.com>
To: David Gibson <dwg@au1.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Marcelo Tosatti <mtosatti@redhat.com>,
kvm@vger.kernel.org, Alexander Graf <agraf@suse.de>,
Paul Mackerras <paulus@au1.ibm.com>,
kvm-ppc@vger.kernel.org
Subject: Re: Reset problem vs. MMIO emulation, hypercalls, etc...
Date: Wed, 08 Aug 2012 12:42:02 +0000 [thread overview]
Message-ID: <50225E9A.4070808@redhat.com> (raw)
In-Reply-To: <20120808115943.GU16664@truffala.fritz.box>
On 08/08/2012 02:59 PM, David Gibson wrote:
>>
>> No, you're correct. HLT could have been emulated in userspace, it just
>> wasn't. The correct statement is that HLT was arbitrarily chosen to be
>> emulated in userspace with the synchronous model, but the asynchronous
>> model forced it into the kernel.
>
> Aha! Ok, understood. Uh, assuming you meant kernelspace, not
> userspace in the first line there, anyway.
I did.
> Ok, so I am now reassured
> that our current handling of CEDE in kernelspace does not cause
> problems.
Great. It's a real pity the original local APIC implementation was in
userspace, it causes no end of confusion, and in fact was broken for smp
until recently even though it is 7 years old.
--
error compiling committee.c: too many arguments to function
WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi@redhat.com>
To: David Gibson <dwg@au1.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Marcelo Tosatti <mtosatti@redhat.com>,
kvm@vger.kernel.org, Alexander Graf <agraf@suse.de>,
Paul Mackerras <paulus@au1.ibm.com>,
kvm-ppc@vger.kernel.org
Subject: Re: Reset problem vs. MMIO emulation, hypercalls, etc...
Date: Wed, 08 Aug 2012 15:42:02 +0300 [thread overview]
Message-ID: <50225E9A.4070808@redhat.com> (raw)
In-Reply-To: <20120808115943.GU16664@truffala.fritz.box>
On 08/08/2012 02:59 PM, David Gibson wrote:
>>
>> No, you're correct. HLT could have been emulated in userspace, it just
>> wasn't. The correct statement is that HLT was arbitrarily chosen to be
>> emulated in userspace with the synchronous model, but the asynchronous
>> model forced it into the kernel.
>
> Aha! Ok, understood. Uh, assuming you meant kernelspace, not
> userspace in the first line there, anyway.
I did.
> Ok, so I am now reassured
> that our current handling of CEDE in kernelspace does not cause
> problems.
Great. It's a real pity the original local APIC implementation was in
userspace, it causes no end of confusion, and in fact was broken for smp
until recently even though it is 7 years old.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2012-08-08 12:42 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-01 3:17 Reset problem vs. MMIO emulation, hypercalls, etc Benjamin Herrenschmidt
2012-08-01 3:17 ` Benjamin Herrenschmidt
2012-08-02 10:46 ` Alexander Graf
2012-08-02 10:46 ` Alexander Graf
2012-08-02 12:22 ` Benjamin Herrenschmidt
2012-08-02 12:22 ` Benjamin Herrenschmidt
2012-08-02 12:35 ` Avi Kivity
2012-08-02 12:35 ` Avi Kivity
2012-08-02 12:59 ` Alexander Graf
2012-08-02 12:59 ` Alexander Graf
2012-08-02 13:05 ` Avi Kivity
2012-08-02 13:05 ` Avi Kivity
2012-08-02 20:29 ` Benjamin Herrenschmidt
2012-08-02 20:29 ` Benjamin Herrenschmidt
2012-08-05 8:55 ` Avi Kivity
2012-08-05 8:55 ` Avi Kivity
2012-08-05 20:45 ` Benjamin Herrenschmidt
2012-08-05 20:45 ` Benjamin Herrenschmidt
2012-08-02 20:20 ` Benjamin Herrenschmidt
2012-08-02 20:20 ` Benjamin Herrenschmidt
2012-08-03 17:41 ` Marcelo Tosatti
2012-08-03 17:41 ` Marcelo Tosatti
2012-08-03 18:05 ` Marcelo Tosatti
2012-08-03 18:05 ` Marcelo Tosatti
2012-08-03 22:32 ` Benjamin Herrenschmidt
2012-08-03 22:32 ` Benjamin Herrenschmidt
2012-08-05 9:00 ` Avi Kivity
2012-08-05 9:00 ` Avi Kivity
2012-08-06 20:25 ` Scott Wood
2012-08-06 20:25 ` Scott Wood
2012-08-07 8:44 ` Avi Kivity
2012-08-07 8:44 ` Avi Kivity
2012-08-06 20:54 ` Benjamin Herrenschmidt
2012-08-06 20:54 ` Benjamin Herrenschmidt
2012-08-03 22:30 ` Benjamin Herrenschmidt
2012-08-03 22:30 ` Benjamin Herrenschmidt
2012-08-06 3:13 ` David Gibson
2012-08-06 3:13 ` David Gibson
2012-08-06 20:57 ` Benjamin Herrenschmidt
2012-08-06 20:57 ` Benjamin Herrenschmidt
2012-08-07 1:32 ` David Gibson
2012-08-07 1:32 ` David Gibson
2012-08-07 8:46 ` Avi Kivity
2012-08-07 8:46 ` Avi Kivity
2012-08-07 12:14 ` David Gibson
2012-08-07 12:14 ` David Gibson
2012-08-07 13:13 ` Avi Kivity
2012-08-07 13:13 ` Avi Kivity
2012-08-07 21:09 ` Benjamin Herrenschmidt
2012-08-07 21:09 ` Benjamin Herrenschmidt
2012-08-08 8:52 ` Avi Kivity
2012-08-08 8:52 ` Avi Kivity
2012-08-08 9:27 ` Benjamin Herrenschmidt
2012-08-08 9:27 ` Benjamin Herrenschmidt
2012-08-08 0:49 ` David Gibson
2012-08-08 0:49 ` David Gibson
2012-08-08 8:58 ` Avi Kivity
2012-08-08 8:58 ` Avi Kivity
2012-08-08 11:59 ` David Gibson
2012-08-08 11:59 ` David Gibson
2012-08-08 12:42 ` Avi Kivity [this message]
2012-08-08 12:42 ` Avi Kivity
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