linux-kernel - Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked

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Date:	Thu, 22 Mar 2012 16:34:11 +0800
From:	Wen Congyang <wency@...fujitsu.com>
To:	Anthony Liguori <anthony@...emonkey.ws>
CC:	Avi Kivity <avi@...hat.com>, Jan Kiszka <jan.kiszka@...mens.com>,
	Gleb Natapov <gleb@...hat.com>,
	qemu-devel <qemu-devel@...gnu.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Eric Northup <digitaleric@...gle.com>,
	kvm list <kvm@...r.kernel.org>,
	Amit Shah <amit.shah@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [Qemu-devel] [PATCH 0/2 v3] kvm: notify host when guest panicked

At 03/22/2012 03:12 AM, Anthony Liguori Wrote:
> On 03/15/2012 06:46 AM, Avi Kivity wrote:
>> On 03/15/2012 01:25 PM, Jan Kiszka wrote:
>>>>>
>>>> There was such vm exit (KVM_EXIT_HYPERCALL), but it was deemed to be a
>>>> bad idea.
>>>
>>> BTW, this would help a lot in emulating hypercalls of other hypervisors
>>> (or of KVM's VAPIC in the absence of in-kernel irqchip - I had to jump
>>> through hoops therefore) in user space. Not all those hypercall handlers
>>> actually have to reside in the KVM module.
>>>
>>
>> That is true.  On the other hand the hypercall ABI might go to pieces if
>> there was no central implementation.
> 
> Just declare that outl 0x505 is a megaultracall and s/vmcall/outb/g and
> call it a day.

Why use 0x505? Is it a reserved port, and it will not be used by any device?

How can I get all reserved port?

Thanks
Wen Congyang

> 
> The performance difference between vmcall and outl is so tiny compared
> to the cost of dropping to userspace that it really doesn't matter which
> instruction is used.
> 
> Regards,
> 
> Anthony Liguori
> 
>>
> 
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