linux-kernel - Re: [PATCH 2/4] xen: switch to use hypervisor_cpuid

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Message-ID: <51EE6601.80802@redhat.com>
Date:	Tue, 23 Jul 2013 13:16:17 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Jason Wang <jasowang@...hat.com>
CC:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, gleb@...hat.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	xen-devel@...ts.xensource.com,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 2/4] xen: switch to use hypervisor_cpuid_base()

Il 23/07/2013 11:41, Jason Wang ha scritto:
> Switch to use hypervisor_cpuid_base() to detect Xen.
> 
> Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> Cc: Jeremy Fitzhardinge <jeremy@...p.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: x86@...nel.org
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: xen-devel@...ts.xensource.com
> Cc: virtualization@...ts.linux-foundation.org
> Signed-off-by: Jason Wang <jasowang@...hat.com>
> ---
>  arch/x86/include/asm/xen/hypervisor.h |   16 +---------------
>  1 files changed, 1 insertions(+), 15 deletions(-)
> 
> diff --git a/arch/x86/include/asm/xen/hypervisor.h b/arch/x86/include/asm/xen/hypervisor.h
> index 125f344..d866959 100644
> --- a/arch/x86/include/asm/xen/hypervisor.h
> +++ b/arch/x86/include/asm/xen/hypervisor.h
> @@ -40,21 +40,7 @@ extern struct start_info *xen_start_info;
>  
>  static inline uint32_t xen_cpuid_base(void)
>  {
> -	uint32_t base, eax, ebx, ecx, edx;
> -	char signature[13];
> -
> -	for (base = 0x40000000; base < 0x40010000; base += 0x100) {
> -		cpuid(base, &eax, &ebx, &ecx, &edx);
> -		*(uint32_t *)(signature + 0) = ebx;
> -		*(uint32_t *)(signature + 4) = ecx;
> -		*(uint32_t *)(signature + 8) = edx;
> -		signature[12] = 0;
> -
> -		if (!strcmp("XenVMMXenVMM", signature) && ((eax - base) >= 2))
> -			return base;
> -	}
> -
> -	return 0;
> +	return hypervisor_cpuid_base("XenVMMXenVMM", 2);
>  }
>  
>  #ifdef CONFIG_XEN
> 

Reviewed-by: Paolo Bonzini <pbonzini@...hat.com>
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