linux-kernel - Re: [Qemu-devel] [PATCH v7] kvm: notify host when the guest is panicked

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Message-ID: <500A8969.1040300@gmail.com>
Date:	Sat, 21 Jul 2012 12:50:17 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	Wen Congyang <wency@...fujitsu.com>
CC:	kvm list <kvm@...r.kernel.org>, qemu-devel <qemu-devel@...gnu.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Avi Kivity <avi@...hat.com>,
	"Daniel P. Berrange" <berrange@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Gleb Natapov <gleb@...hat.com>
Subject: Re: [Qemu-devel] [PATCH v7] kvm: notify host when the guest is panicked

On 07/21/2012 09:12 AM, Wen Congyang wrote:
> +#define KVM_PV_PORT	(0x505UL)
> +
>  #ifdef __KERNEL__
>  #include <asm/processor.h>
>  
> @@ -221,6 +223,11 @@ static inline void kvm_disable_steal_time(void)
>  }
>  #endif
>  
> +static inline unsigned int kvm_arch_pv_features(void)
> +{
> +	return inl(KVM_PV_PORT);
> +}
> +

Why is this safe?

I'm not sure you can just pick any ioport you'd like and use it.
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