linux-kernel - Re: [PATCH -v2 2/2] x86: Make Linux guest support optional

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Date:	Fri, 25 Jan 2013 10:07:31 -0800
From:	Dmitry Torokhov <dtor@...are.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	X86 ML <x86@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
	jasowang@...hat.com, Thomas Gleixner <tglx@...utronix.de>,
	JBeulich@...e.com, Borislav Petkov <bp@...e.de>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: Re: [PATCH -v2 2/2] x86: Make Linux guest support optional

Hi Borislav,

On Fri, Jan 25, 2013 at 06:59:37PM +0100, Borislav Petkov wrote:
> diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
> index 8e1a9ec53003..cb467656e684 100644
> --- a/drivers/hv/vmbus_drv.c
> +++ b/drivers/hv/vmbus_drv.c
> @@ -724,7 +724,7 @@ static int __init hv_acpi_init(void)
>  {
>  	int ret, t;
>  
> -	if (x86_hyper != &x86_hyper_ms_hyperv)
> +	if (!x86_hyper || strncmp(x86_hyper->name, "VMware", 6))
>  		return -ENODEV;

I assume this is a typo as I doubt MS is using the same signature as we
do.

>  
>  	init_completion(&probe_event);
> diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c
> index cb56e270da11..85f15a6d8798 100644
> --- a/drivers/misc/vmw_balloon.c
> +++ b/drivers/misc/vmw_balloon.c
> @@ -786,7 +786,7 @@ static int __init vmballoon_init(void)
>  	 * Check if we are running on VMware's hypervisor and bail out
>  	 * if we are not.
>  	 */
> -	if (x86_hyper != &x86_hyper_vmware)
> +	if (!x86_hyper || strncmp(x86_hyper->name, "VMware", 6))
>  		return -ENODEV;
>

I wonder why you decided to switch from address matching (which is quite
precise and would potentially allow adding signatures without needing
to change the drivers) to string matching?

Thanks,
Dmitry
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