From: Avi Kivity <avi@redhat.com>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: kvm@vger.kernel.org, Jan Kiszka <jan.kiszka@siemens.com>
Subject: Re: [PATCH] KVM: Use thread debug register storage instead of kvm specific data
Date: Tue, 01 Sep 2009 14:34:12 +0300 [thread overview]
Message-ID: <4A9D06B4.4060708@redhat.com> (raw)
In-Reply-To: <20090901112220.GA18271@amt.cnet>
On 09/01/2009 02:22 PM, Marcelo Tosatti wrote:
> On Tue, Sep 01, 2009 at 12:44:08PM +0300, Avi Kivity wrote:
>
>> Instead of saving the debug registers from the processor to a kvm data
>> structure, rely in the debug registers stored in the thread structure.
>> This allows us not to save dr6 and dr7.
>>
>> Reduces lightweight vmexit cost by 350 cycles, or 11 percent.
>>
> Is this kgdb safe?
>
I don't think so - kgdb seems to access the debug registers directly. I
think we can live with it at the moment, and later add an API to
arbitrate debug register usage among the various users (kgdb seems to be
unsafe wrt userspace debug as well).
--
error compiling committee.c: too many arguments to function
prev parent reply other threads:[~2009-09-01 11:34 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-01 9:44 [PATCH] KVM: Use thread debug register storage instead of kvm specific data Avi Kivity
2009-09-01 9:47 ` Avi Kivity
2009-09-01 18:12 ` Andrew Theurer
2009-09-01 18:23 ` Avi Kivity
2009-09-04 14:48 ` Andrew Theurer
2009-09-04 15:30 ` Brian Jackson
2009-09-04 16:08 ` Andrew Theurer
2009-09-04 17:04 ` Brian Jackson
2009-09-05 11:34 ` Vadim Rozenfeld
2009-09-06 12:49 ` Yan Vugenfirer
2009-09-06 8:21 ` Avi Kivity
2009-09-01 10:42 ` Jan Kiszka
2009-09-01 11:08 ` Jan Kiszka
2009-09-01 11:16 ` Avi Kivity
2009-09-01 11:21 ` Avi Kivity
2009-09-01 13:31 ` Jan Kiszka
2009-09-01 13:39 ` Avi Kivity
2009-09-01 11:22 ` Marcelo Tosatti
2009-09-01 11:28 ` Jan Kiszka
2009-09-01 11:32 ` Marcelo Tosatti
2009-09-01 11:35 ` Avi Kivity
2009-09-01 11:33 ` Jan Kiszka
2009-09-01 11:43 ` Avi Kivity
2009-09-01 11:45 ` Jan Kiszka
2009-09-01 11:56 ` Avi Kivity
2009-09-01 12:01 ` Jan Kiszka
2009-09-01 12:02 ` Avi Kivity
2009-09-01 12:27 ` Avi Kivity
2009-09-01 11:34 ` Avi Kivity [this message]
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